ABOUT THE CONFERENCE

Following the great success of the 2020 User Conference, we are happy to announce that the 2021 EMTP® User Conference will be VIRTUAL and accessible WORLDWIDE.

The event will take place virtually between August 31st and September 7th, 2021 with three to four presentations a day.

Two themes will be covered during the conference:

  • Inverter-based resources (IBR): analysis for renewables and HVDC
  • Electromagnetic Transients (EMT): traditional studies such as switching, lightning, ferroresonance,…

To know more about the program, download it.

This event brings together power system experts, software users, EMTP® developers, the EMTP® software support team and EMTP® marketing personnel.

During the EMTP® User Conference:

  • You can connect/interact with EMTP® users working in the industry, research centers and universities
  • You can share, discuss your simulation problems, and learn about EMTP® and power system transients in general
  • You can influence the development path of EMTP® by making propositions and presentations
  • You can learn of the latest EMTP® developments
  • You can learn about power system transients through high-level technical presentations

Registration fees:*

  • Conference Introduction: Free
  • Inverter-based resources (IBR): $200
  • Electromagnetic Transients (EMT): $200

*The conference is free for existing clients under a current maintenance contract.

 


AGENDA

Day 1

Aug. 31, 2021

Day 2

Sep. 1, 2021

Day 3

Sep. 2, 2021

Day 4

Sep. 3, 2021

Day 5

Sep. 6, 2021

Day 6

Sep. 7, 2021


 

Los Angeles (PST)

New York (EST)

Paris (CET)

Chennai (IST)

IBR (Inverter-Based Resources)

EMT (Electromagnetic Transients)


06:00 am

09:00 am

03:00 pm

06:30 pm

Conference Introduction & EMTP Development Roadmap

Jean Mahseredjian, PGSTech

Outline:
• EMTP development, what is new in version 4.2 and what is next: Jean Mahseredjian – EMTP lead developer
• Improvements to the Renewables toolbox: Henry Gras – EMTP Director
• New Line/Cable data calculation module: Jesus Morales – EMTP developer
• New CIGRE DLL: Anton Stepanov – EMTP developer
• Improvements to TRV breaker: Henry Gras – EMTP Director
• PSS®E Import tool: Henry Gras – EMTP Director
• Q/A session

01:00 am

04:00 am

10:00 am

01:30 pm

A Case Study of Optimization of Neutral Grounding Reactor Parameters

Mr. Umesh Sen, Power Grid

In EHV power transmission system, SLG (single line to ground) faults are very frequent in nature. These faults are generally temporary in nature however it may lead to system stability and reliability issues. To take care of these aspects, auto reclosing technique is adopted. Various schemes are available to make successful auto reclosing like Modified Selective Switched Four-legged Reactor Scheme, Transmission Lines with Four-legged Reactor Bank, High Speed Earth Switch Scheme (HSES), and Hybrid Single-phase Scheme. For continuously transposed line generally four legged reactors are preferred to be employed in EHV lines. Shunt reactor’s neutral is grounded with a suitable reactor which is named as neutral grounding reactor (NGR).
Presentation covers methodology to arrive the optimize value of 765kV EHVAC system and discussed the NGR behaviour w.r.t variation of different system parameters likes degree of reactive compensation, line length, fault location, power flow and bus capacity. Also highlights the insulation coordination of NGR and suggested the design parameter of 765kV NGR. Further, a brief about the facility available at Powergrid Advanced Research and Technology Centre (PARTeC) like dynamic functional type test of IEDs, HVDC control Replica setup, STATCOM replica setup.

02:00 am

05:00 am

11:00 am

02:30 pm

VFTO Induced TGPR Analysis for 400kV GIS Substation

Mr. N.K. Nathan , KNR Engineers Pvt. Ltd.

Transient enclosure voltage (TEV) also known as Transient ground potential rise (TGPR) is a special case of VFTO. This phenomenon refers to short rise time, short duration high voltage transient which appear on earthed enclosure of GIS. This is mainly through the coupling of internal transients on conductor refracted to the enclosure at enclosure discontinuities such as air terminations, insulated flanges at GIS/Cable interfaces and some current transformers. Primarily disconnector switch operations are causes of VFTO and SF6-Air bushing seems to be the most significant source of TEV. Observation of sparking between grounded enclosure and support structure, failure of protective devices, inadvertent operation of relays etc are common malfunction of TEV. Despite proper grounding this phenomenon indicates presence of high potentials on GIS enclosures which raises the issue of equipment protection, migration of these transients to adjacent equipment and shock hazards.
TEV in 400kV GIS substation due to “disconnector switch operation” was studied and simulations performed for GIS model with the equivalent resistance of ground grid, resistance and inductance of grounding strip using EMTP. The presentation summarizes the results of study needed for a 400kV GIS substation in India to ascertain VFTO induced TGPR level. The study was carried out by modeling all GIS equipment, enclosure in EMTP and careful consideration of grounding system model. The results of the study were analyzed to decide on the requirement of mitigation methods to ensure the permissible level of TEV.

05:00 am

08:00 am

02:00 pm

05:30 pm

Design and Performance Assessment of Harmonic Filters Using EMTP

Davor Vujatovic, Vanda

In order to permit access to a public electricity network, a network operator will impose compliance with certain technical requirements, which must be met by the potential network user seeking the connection to the network.
These technical requirements are typically quite extensive and detailed and generally include requirements for compliance with power quality standards, including harmonic distortion standards. As a result of the requirement to comply with harmonic distortion standards and the requirements therein, it is sometimes necessary to provide harmonic filtering in order to ensure the public network will remain within the required harmonic distortion limits under all normal operating conditions.
This presentation gives a study case for a connection to a 400kV network which required design and installation of a number of filters in order to ensure compliance with the harmonic distortion limits on the public network.
As part of the assessment and design process, a number of studies was undertaken in order to ensure all aspects of the filter system design perform as required, under all operating conditions. These studies included:
• harmonic propagation and distortion calculations,
• filter configuration and optimisation studies,
• filter loading studies,
• filter transient studies,
• filter protection studies.
The tool used in the assessments was EMTP. The presentation will demonstrate certain aspects of the EMTP capability and use in steady state and electromagnetic transient studies applied to the filter system design, validation and compliance studies.

06:00 am

09:00 am

03:00 pm

06:30 pm

Traveling-wave Fault Locator Model Development Using EMTP

Dr. Milton Quinteros & Thomas Field, Entergy Services, Inc. & Toby Russell & Dr. Prashanna Bhattarai, Louisiana Tech

 This presentation briefly discusses the development of a computer model of a traveling-wave based fault locator using EMTP, as well as simulation results using the developed model. Specifically, the block discussed in this presentation is based on the double-ended method of fault location. Traveling wave extraction from raw waveforms and the time-of-arrival estimation using appropriate signal processing techniques are also briefly discussed. Simulation results using the fault locator model in a transmission system model are shown, and comparison of results with the fault locator of an actual traveling-wave relay are presented as well.

07:00 am

10:00 am

04:00 pm

07:30 pm

Modular Multilevel Matrix Converters for Low Frequency AC Transmission

Rafael Castillo Sierra , WEMPEC (University of Wisconsin – Madison) & Prof. Dionisio Ramirez, Universidad Politecnica de Madrid

The transmission of electric power with alternating current (AC) faces constraints that are inherent both to the stable operation of the power system and to the physical properties of the transmission lines or cables. Many factors stand to motivate the alleviation of these constraints without a need to construct new transmission lines or cables. One demonstrated method to accomplish this is to lower the electrical frequency of a transmission branch or section of the network, an approach known as low frequency AC (LFAC) transmission. The resulting lower reactance of the lines improves the transmission under the stability concerns which arise with long, inductive overhead lines, as well as under thermal concerns that can be substantial due to charging currents in underground cables. In this order of ideas, the Modular Multilevel Matrix Converter (MMMC) offers the necessary frequency conversion for low-frequency transmission, while allowing controllability of power through the transmission line. For this reason, this presentation focuses on the EMTP modeling and simulation of this converter starting from a design that meets the typical voltage and power requirements for a transmission line. The averaged model of the converter has been implemented to evaluate its performance as a frequency converter and how it interacts with the power system. Simulations have been carried out under nominal operating conditions in a study case power system.

01:00 am

04:00 am

10:00 am

01:30 pm

Real Case of a Resonance in a Power Plant

Andreia Leiria, EDP

Overvoltages were identified on the MV and LV networks of a Hydro Power Plant as the cause of the trip of the LV maximum voltage protection, compromising the normal operation of the system. Following this event, measurements were conducted and the presence of a very high 23rd harmonic, potentially responsible for the various overvoltages, was identified associated to the operation of the Plant’s Synchronous Machine Frequency Control System (FCS). It was concluded then that this harmonic would have its origin in the FCS and would be amplified due to a possible resonance in the Power Plant internal network. A digital simulation study, using EMTP-RV, was conducted to identify and characterize the resonance in the system and to propose mitigation solutions. The simulation models were developed using the equipment data and the system characteristics. The models were duly validated with measurements made both in time and frequency domains and it was possible to identify the origin of the overvoltages and their propagation in the system. It was concluded that the resonance occurred between a 30/11 kV Power Transformer and a 30 kV cable with 850 m. This conclusion was supported by the results obtained in the measurements. Several alternatives were analyzed as mitigation solutions: - Installation of capacitors; - Different bonding techniques of the 30 kV cable sheaths; - Changing the 30 kV cable length; - Installation of a harmonic filter; The advantages and disadvantages of each solution were weighed also considering the ease of implementation, namely the available room. It was concluded that the installation of capacitors would be the best option. Measurements were conducted after the capacitor’s installation confirming the success of this solution.

02:00 am

05:00 am

11:00 am

02:30 pm

Measurement and EMTP Simulation of Ferroresonance Phenomenon

Pr. Ivo Uglesic , FER

Ferroresonance is difficult to predict because its occurrence in the power system depends on several parameters, some of which are unknown (parasitic capacities). In addition, measuring electrical conditions during high voltage ferroresonance is very difficult to achieve. In order to check the possibilities of numerical calculations of ferroresonance, the ferroresonant circuit was made as a low voltage circuit in which all parameters were known. Measurement of ferroresonant current and voltages in a single-phase low voltage circuit will be described. The system consists of an AC voltage source, a capacitor, a switch and the single-phase transformer. These electrical elements are connected in series. The magnetic flux-current points of the magnetization curve of the transformer was experimentally obtained and used in the simulation. When the switch closes, ferroresonance takes place since all conditions were met for its occurrence. The waveforms of the transformer current and the voltage at the transformer terminals were measured after switch closing. During the ferroresonance, transformer voltage and current reach relatively high values. At the beginning of the ferroresonance (during its transient part), the voltage of the transformer reaches values that are about two times higher in amplitude than the amplitude of the AC source. The primary side of the transformer was modelled with a series connection of the ohmic resistance and leakage inductance. The core was modelled with a parallel connection of the ohmic resistance and nonlinear inductance. The ohmic resistance represents the core losses while the nonlinear inductance models the magnetizing characteristic of the transformer. A comparison between simulated and experimentally obtained results shows that EMTP successfully simulates the ferroresonance phenomenon for this specific electrical system as simulated results are in a good agreement with the measured results.

03:00 am

06:00 am

12:00 pm

03:30 pm

Simulation of Inductive Electromagnetic Interference Caused by an HVDC Underground Cable Link on a Nearby Railway System

Theofilos Papadopoulos, DUTH

Scope of the presentation is to present results regarding inductive electromagnetic interference (EMI) between a real HVDC link and the nearby communication cables of a railway system under pole-to-ground fault conditions. Τhe HVDC and the railway system route in parallel at a part of the onshore section of the HVDC link. The inductive EMI on the communication cable arises from magnetic field variation of the high-frequency components contained in the transient response of the fault current, excited by the HVDC link. Consequently, it is expected that no inductive EMI will occur by the DC current in the case of the HVDC system normal operation (steady-state) either in bipolar or monopolar (current return though the electrode) mode. The induced transient voltages and currents are calculated using the Electromagnetic Transients Program (EMTP-RV).

05:00 am

08:00 am

02:00 pm

05:30 pm

Ground Fault Overvoltage with Inverter-Based Distributed Energy Resources – Modeling & Simulation Requirements

Aboutaleb Haddadi, Electric Power Research Institute (EPRI)

 A Ground Fault Overvoltage (GFO) can occur in situations where an ungrounded transmission line and associated ungrounded transmission equipment is energized from distribution connected Distributed Energy Resource (DER) during a transmission single-phase-to-ground (SLG) fault. The condition could result in 1.73 pu overvoltage on phase to ground connected equipment which will be sustained until the DER ceases to energize the substation distribution transformer. Transmission equipment on the isolated circuit will be subjected to the above phase to ground overvoltage, also if there is frequency shift, the isolating transmission circuit breakers could potentially see up to 2.73 pu phase to ground overvoltage. Such an overvoltage can cause damage to customer or utility equipment and must be avoided. GFO concerns are already becoming a barrier to large-scale DER deployment either by posing low hosting capacity or by necessitating installation of costly mitigation equipment. Utilities need to study GFO risks and identify low-cost mitigation options to enable large-scale DER deployment. Given the fundamental differences in mechanisms and phenomena driving a GFO under DERs, classical GFO analysis methods do not apply to inverters, and advanced simulation methods and tools are required.
This presentation highlights EPRI’s work on GFO analysis, concerns, and evaluation of mitigation options using EMTP. The objective is to determine if or when high DER penetration presents a GFO problem and how to prioritize the mitigation and equipment evaluation. This includes evaluating the impact lightning arresters can have in reducing or clamping the overvoltage, the application and performance of high voltage substation overvoltage protection, and DER on-board voltage/frequency protection. The presentation further provides modeling recommendations for such a study using EMTP. As DER deployment increases, utilities will need to perform similar analysis to identify potential overvoltage risks and develop low-cost mitigation methods. This work provides a basis for such a study.

06:00 am

09:00 am

03:00 pm

06:30 pm

Optimization of Control Parameters of Grid-Connected PV System in EMTP Using Particle Swarm Optimization

Bikrant Poudel, University of New Orleans

It is observed that the controller gain parameters of the PV model have a significant impact on the PV plant’s response during the fault recovery and the PV plant’s interaction with the rest of the system in general. Manual tuning of the PV park parameter considering multiple fault and contingency scenarios is a time-consuming task and might even be impossible. Optimization techniques such as particle swarm optimization (PSO) can be used to optimize the gain parameters considering fault/ contingency scenarios. The presentation will talk about the implementation of PSO in EMTP-RV using javascript to optimize PV park controller gain parameters.

07:00 am

10:00 am

04:00 pm

07:30 pm

Developing a Manufacturer Black Box STATCOM Model in EMTP

Tim Freiberg, AMSC

This presentation goes over the development of a black box STATCOM model in EMTP, using manufacturer source code, and benchmarking of the model performance.

01:00 am

04:00 am

10:00 am

1:30 pm

A Novel Non-Iterative Fault Location Algorithm for Transmission Line with Unsynchronized Terminal Using EMTP

Mr. Kaustav Jyoti Kalita , Power Grid Corporation of India Limited

This letter presents a novel non-iterative impedance based two-terminal fault location algorithm with unsynchronized terminals. The novelty of this method lies in the fact that it is non-iterative, does not require signal alignment, are independent of fault classification, suitable for both transposed and untransposed lines with distributed line model. Several results of simulations on standard and practical data of Power Grid Corporation of India Limited (PGCIL) are presented. The test results verifies the validity and accuracy of the developed fault location algorithm.

02:00 am

05:00 am

11:00 am

2:30 pm

Ground Fault Detection and Feeder Protection of 2x25kV Railway Traction System

Mr. Suyash Kulkarni & Mr. Suved M. Pakade, Ashida Electronics Pvt. Ltd.

In a new 2X25 kV System, Scott transformer is used as a traction transformer and to supply the power to the railway traction system. It is protected using the percentage differential relay. However, region from the low voltage side of the Scott transformer to the first autotransformer is unprotected at the field and to protect the system during fault on this region is very important. Thus, development of protection scheme is required. Herein, we modeled 2X25kV traction system in EMTP, simulate faults and developed a specific relationship to provide the protection for this scheme. We have taken the current input from feeder current transformers and observed its current during the faults. This performance of this scheme is verified using EMTP. Further, impedance to distance ratio is non-linear due to the autotransformer between catenary, rail and feeders in 2x25kV railway traction system. To observe this behavior as per field details and provide the accurate relay setting, we simulate the faults over the length of protected line in EMTP and field test are carried out. In the event of a fault on unprotected region and on the protected line, trip occurs and relay recorded fault details at the field.

03:00 am

06:00 am

12:00 pm

03:30 pm

Impact of Power Transformer Energization on Relay Protection Operation

Pr Bozidar Filipovic-Grcici, FER

One of the main causes of the incorrect operation of transformer relay protection are inrush currents. The transient inrush current occurs when energizing the unloaded transformer, and it is a consequence of the transformer core saturation. This paper presents analysis of transients caused by energization of 300 MVA three-phase autotransformer with stabilizing winding and voltage ratios 400/115/10,47 kV. Using the PAMSUITE Toolbox in EMTP, many simulations were performed to show the impact of model’s parameters on the amplitude and duration of inrush currents as well as the probability of 2nd harmonic differential current amplitude occurrence. Simulation results show that controlled switching reduces inrush currents amplitudes and increases 2nd harmonic content in differential currents. A Protection Toolbox in EMTP was used for modelling CT saturation and operation of transformer’s differential protection relay. Based on the simulation results the optimal differential protection settings were determined, and the probability of false relay protection operation was calculated.

05:00 am

08:00 am

02:00 pm

05:30 pm

Screening Studies for Susceptibility to Sub Synchronous Control Interaction using EMTP

Dr. Romulo Bainy, University of Idaho & Jared Mraz, Power Engineers Inc. & Dr. Normann Fischer, Schweitzer Engineering Laboratories & Dr. Johnson, University of Idaho

Sub Synchronous Control Interaction (SSCI) is can occur between type 3 wind turbines and a series capacitor. SSCI events can result in severe overvoltages that can damage equipment on the transmission system. This presentation will provide a brief history of SSCI, its impacts on the power system, and how to perform screening studies for SSCI susceptibility using EMTP… The presentation will also include a discussion of challenges encountered, and key results observed, during screening studies performed by IEEE working group J18 for an example power system. Areas of future study will also be highlighted.

06:00 am

09:00 am

03:00 pm

06:30 pm

Dynamic Overvoltage Conditions Experienced at a PV Solar Power Plant

Chandra Pallem, Enernex

We present the results from an investigation of the cause of dynamic overvoltage conditions experienced at a solar power plant, that resulted from energizing the PV solar plant 34.5 kV collection system feeders using a back-up diesel generator. The diesel generator unit was installed at the solar plant for emergency back-up power to the project, in case of power outage from the connecting transmission utility system. The back-up power source was provided to allow the operation of the solar power tracking system during emergency conditions. A subsequent study was performed using EMTP software program, to investigate the cause of these dynamic overvoltage conditions at the solar power plant. A detailed transient model of the solar plant and the diesel generator were developed using EMTP. The EMTP simulations were useful in replicating the overvoltage event measurement recordings from the site, and the simulation results from the study, concluded that the diesel generator did not have sufficient capability to pick up capacitive loads and therefore, the unit was unable to control the overvoltage conditions which led to the overvoltage event that caused equipment damage to the PV inverters and their auxiliary systems. The study evaluated various solution alternatives and mitigation strategies to reduce these dynamic overvoltages to acceptable conditions.

07:00 am

10:00 am

04:00 pm

07:30 pm

EMTP in Transmission Planning Research

Bob Arritt, Electric Power Research Institute (EPRI)

The initiation of inverter-based generation (IBG), has been changing the characteristics of the grid.  The addition of non-traditional generation sources gives rise to several grid concerns, such as reduced short-circuit fault current capacity and system inertia as well as ineffective voltage regulation. Because of this – the use of EMT studies has been becoming more common to accommodate special studies. This presentation will just highlight a few examples of the use of EMTP in transmission level planning research.

01:00 am

04:00 am

10:00 am

01:30 pm

Closed-loop Synthetic Inertia Control of a Variable-speed Wind Turbine Generator

Pr. Yong Cheol KANG, Yonsei University (South Korea)

As the penetration of wind power generation increases, the frequency stability of a power grid might be jeopardized if wind turbine generators (WTGs) keep maximum power point tracking (MPPT) operation.

This is because the frequency further declines in the case of a frequency event. However, a variable-speed WTG has a wide operating range of the rotor speed. Thus, kinetic energy stored in the rotating masses can be released instantly to improve the frequency nadir following an event by using a back-to-back converter installed in a variable-speed WTG. This is called synthetic inertia control (SIC) of a WTG.

This presentation introduces a closed-loop SIC scheme of a doubly-fed induction generator (DFIG), which relies on the measured frequency. The SIC scheme employs an additional control loop that operates in conjunction with the MPPT control loop. Simulation results using an EMTP-RV simulator will be presented under various wind and system conditions for the IEEE 14-bus system.

02:00 am

05:00 am

11:00 am

02:30 pm

Analysis and Calculations in Medium Voltage Electrical Systems - Two “Circuit Breaker Suitability” Case Studies

Stefano Vitali, ABB Italy

The electrical installation of an industrial site is a complex structure. Analyzing behavior in a transient condition allows optimum selection of the operation and protection devices in the installation design phase; in addition, possible weaknesses and critical points can be highlighted in advance, allowing prevention of potential problems, damage to machinery, and costly periods of down time.

In order to completely satisfy the needs and expectations of the customer, in ABB Electrification Business an important role is played by analyses and consulting services offered by Field Application Support (FAS) specialist.

In this session of the “EMTP User conference”, representatives from the Italian ABB Distribution Solution division, based in Dalmine (BG), will show how EMTP tool supports the analyses performed within the “Medium Voltage Circuit Breaker Suitability” reports that are provided to customers looking for switching devices for special applications. In particular, the today presentation will focus on “CB suitability” study approach for the Generator Circuit Breaker and the Filter Harmonics switching applications.

05:00 am

08:00 am

02:00 pm

05:30 pm

Locating faults in electrical power networks using EMTP-RV: a practical case

Asia Codino, Streamer

In the context of modern and active power distribution grids, reliable and efficient fault location functionalities are increasingly required to match strict power quality constraints. Indeed, when a fault occurs, power supply restoration can be faster if the location of the fault is either known or can be estimated with satisfactory accuracy. The presentation will show how EMTP-RV can be used to locate faults in electrical power grids, describe a practical implementation in a power distribution grid, and report some experimental results of a test campaign.

06:00 am

09:00 am

03:00 pm

06:30 pm

Induced Voltage Study

Rohit Kunte, MidAmerican Energy

MidAmerican Energy has conducted studies at some locations on our system to identify voltages that are induced due to lines on the same structures. For example, MidAmerican added a new 161 kV line from substation D to substation E (not shown) through substation C. The line is mostly single circuit except between substations B and C where a second 161 kV line was added on the structures. There is also an existing 13.2 kV underbuilt distribution circuit on the structures between substations A to C. The induced voltage study was performed to get an understanding on the level of voltages that may be expected when the 161 kV line from substation A to substation C is out of service, but the 161 kV line from substation D to substation C is in service and vice versa. The analysis provided very useful information on the level of induced voltages that may be expected on the 13 kV distribution feeder and helped MidAmerican to develop mitigation measures.

07:00 am

10:00 am

04:00 pm

07:30 pm

Measurements and Simulations of Electromagnetic Transients in Wide Distribution Networks

Luiz Felipe Ribeiro Barrozo Toledo, Lactec

This work shows the modeling of wide distribution networks for simulation of electromagnetic transients of atmospheric origin and due to maneuvers and faults. To carry out the modeling, a methodology for automatic creation of simulation files was developed using the utility's georeferenced database. Several real events both from surges due to lightning and due to faults and maneuvers were measured in the field and compared with the values obtained by simulation.

01:00 am

04:00 am

10:00 am

01:30 pm

Reactive Power Energy Management, Analysis of Reactive Power Consumption in Solar Power Plant and Provide Solution for its Mitigation Technique using EMTP

Neeraj Patel, Adani Power

For any Power Plant, it is aimed to have maximum Energy Generation and yielding for the Power Output. Solar power plant comprises PV cells, framing array by connecting with each solar panel and then connected with step-up transformer (Inductive element) by cable network (capacitance formed). The energy generated by PV cells are being converted by Solar inverters (Power electronics) and operated at almost Unity Power Factor.
It has been observed that with export of Active energy and increasing output, there is also import of Reactive energy varying with solar generation. The Tariff charges are involved and applicable for Reactive Power Consumption in said solar power plant. Active energy also imported during evening and night hours in absence of solar generation to run critical equipments and trend between active and reactive energy has been observed vice versa.
As per the State Tariff regulations, beneficiary must pay/gets paid for reactive power drawl/supply which is decided and bounded by the system voltage limit (e.g. 97% to 103% of Rated system voltage).

Considering varying MVAR absorption phenomena associated with active power generation and effect of supply voltage, it has been decided to study and model solar generation in EMTP. Different cases have been simulated in EMTP software. Major sources consume Reactive Power identified from modelling and matched observation with actual recorded data. Mitigation technique for reactive power compensation has been studied and modelled. Rating for reactive power compensation source has been validated. Switching phenomena associated with reactive power compensation technique along with voltage profile at different points has also been studied and appropriate rating for switching devices/switchgear has been suggested.
Detail study and simulation results will be shared in presentation

02:00 am

05:00 am

11:00 am

02:30 pm

Response of Overhead Lines to Direct Lightning Strikes: Assessment of the Lightning Electromagnetic Pulse (LEMP) Effects

Carlo Alberto Nucci & Fabio Tossani, University of Bologna,

In the usual practice, the evaluation of the overvoltages due to direct lightning strikes to overhead power line conductors is focused on the representation of the effects of the lightning current injection, whilst the effects of the coupling between the conductors and the lightning electromagnetic pulse (LEMP) is disregarded. Motivated by recent results obtained for the case of a medium voltage line configuration with a shield wire, this extends the analysis to assess the contribution of the LEMP on the lightning performance of an overhead distribution with and without periodically grounded wires and surge arresters. Moreover, the presentation deals with the LEMP effect on the occurrence probability of flashovers on different phases, which is an important information on the service continuity of networks with isolated or compensated neutral earthing. A validation of the results is obtained by comparing the overvoltages calculated by using EMTP, together with the LIOV library for the LEMP calculation, and those obtained by a three-dimensional finite difference time-domain approach.

03:00 am

06:00 am

12:00 pm

03:30 pm

Switching of Inductive Currents and Dimensioning of RC-Snubbers with PAMSUITE

Philipp Hackl, TU Graz

In order to control the voltage in distribution and transmission networks shunt reactors can be used for compensation of reactive power. Due to the switching of their inductive currents, unacceptable switching transient voltages might occur which can lead to damage of equipment. Furthermore, the breaker must be able to withstand the transient recovery voltage (TRV), amplit ude and rate of rise (RRRV) respectively. One possibility to mitigate these switching transients are so-called RC Snubbers. They have to be dimensioned according to the topology and the values of R and C can be optimized with the PAMSUITE tool. In this presentation the modelling and the results of the TRV due to shunt reactor switching is discussed and the mitigation with RC Snubbers with the help of PAMSUITE is shown.

05:00 am

08:00 am

2:00 pm

05:30 pm

From FEMM to EMTP Cable Data – How to Use FEMM to Compute the Power Cable Parameters

Frédéric Colas, L2EP (LILLE Arts & Metiers / Centrale)

In the context of the simulation of an electrical network, different models of lines / cables are available. Among these, we can cite the PI models, the frequency dependent models (FD-Line) or the models called Wideband. This last type of modeling is considered in the power system community as a sufficiently precise model to simulate  the behavior of the cable under non-symmetrical faults and more particularly in the case of underground or submarine cables. However, the parameters of this type of model are generally still calculated from a standard geometry. In this presentation, a methodology to obtain, from the software FEMM, the cable data parameters needed for EMTP will be presented. This methodology allows to easily obtain the correct parameters from specific cable geometry.


 


SPEAKERS

Bob Arritt

Bob Arritt is a Technical Executive at the Electric Power Research Institute (EPRI). He received a BS, magnum cum laude, in electrical engineering from West Virginia Institute of Technology in Montgomery, West Virginia. He received a MS degree in electrical engineering from Worcester Polytechnic Institute in Worcester, Massachusetts. His current research activities include leading the geomagnetic disturbance work, distributed resources, system transients, harmonics and protection. Mr. Arritt joined EPRI in 2007. Prior to joining EPRI, Mr. Arritt worked for Raytheon in Sudbury, MA where he worked in the Power and Electronic Systems Department. At Raytheon he was awarded the 2006 Raytheon Technical Honors Award for Peer and Leadership Recognition for Outstanding Individual Technical Contribution and also received a 2005 Raytheon Author’s Award for design of a Phase-Shifted Transformer for Harmonic Reduction. Since at EPRI, Bob has been awarded the Chauncey Award for his outstanding innovative and achievements in science and technology. Mr. Arritt holds a US Patent as the lead inventor for “Method for Detecting an Open-Phase Condition of a Transformer,” has authored several technical paper, is an IEEE Senior member, and Professional Engineer licensed in the State of Tennessee.

Dr. Romulo Bainy

Rômulo G. Bainy received his Ph.D. degree in power systems protection from the University of Brasília, Brazil in 2019. He was a visiting scholar at Washington State University, Pullman, USA, in 2018. Dr. Bainy spent five years working at VOLK, Brazil, performing a variety of services for ITAIPU, Brazil. He has over seven years of experience with research projects, and more than nine years of expertise in programming and transients simulation. His research interests are in power system protection, fault location, electromagnetic transients, renewable energy, and CCVTs. He is a reviewer for IEEE Transactions journals and IEEE conferences. Dr. Bainy is a Postdoctoral Fellow at the University of Idaho, Moscow, USA.

Dr. Prashanna Bhattarai

Dr. Prashanna Bhattarai is an Assistant Professor of Electrical Engineering at Louisiana Tech University. Prior to starting his current position, he was a Lecturer of Electrical Engineering at the same university from September 2016 to May 2021. His research interests include power system protection, power system transients and modeling, and power quality. He obtained his MS and PhD degrees from Louisiana State University in 2013 and 2016 respectively. His current research is focused on traveling-wave relays.

Asia Codino

Asia Codino received the M.Sc. and the Ph.D. degree in electrical engineering from Sapienza University of Rome, Italy, respectively in 2014 and 2018. She is currently an R&D Manager at Streamer Electrical AG, Switzerland. Her research interests include protection systems in distribution networks and fault location techniques.

Frédéric Colas

Frédéric COLAS was born in Lille, France, on October 17, 1980. He received a PhD in control system in 2007 from Ecole Centrale de Lille (France). Frédéric Colas is a member of the Laboratory of Electrical Engineering (L2EP) in Lille and is a Research Engineer at Arts et Métiers Paristech, 8 boulevard Louis XIV, 59046 Lille, France. His field of interest includes the integration of dispersed generation systems in electrical grids, advanced control techniques for power system, integration of power electronic converters in power systems and hardware-in-the-loop simulation. + picture available

Dr. Mickey Cox

Dr. Mickey Cox is a Professor of Electrical Engineering and has been a member of the Louisiana Tech faculty for 38 years. His primary area of expertise is in electric power systems, with emphasis on power quality, instrumentation and measurement, and energy conversion. He teaches a wide variety of courses including circuits, linear systems, electromagnetics, controls, and power systems. Dr. Cox is a registered professional engineer in the state of Louisiana and a Life Senior Member of IEEE.

Mr. Thomas Field

Mr. Thomas Field received a BSEE from the University of New Orleans in 1988 and a MSEE in power from Louisiana State University in 1993. After graduating from LSU, he worked for Nashville Electric Service performing EMTP studies in the Relay and Communications group until 1998, ComEd performing real time transient simulator studies until 1999, Southern Company performing EMTP studies until 2004, and WAPA in the Desert Southwest transmission planning group until 2007. He is currently a Senior Staff Engineer at Entergy where he is responsible for the real time transient simulator lab and university research projects. He is a senior member of IEEE PES, IAS, and SA. He has been a member of several IEEE standards working groups and is currently past chair of the IEEE Mississippi Section.

Pr Bozidar Filipovic-Grcic

Božidar Filipović-Grčić received his PhD degree from the University of Zagreb in 2013. Currently he works as assistant professor at Faculty of Electrical Engineering and Computing. He deals with high voltage engineering, power system transients and overvoltage protection. He is currently involved in three active CIGRE WGs: C4.45 – “Measuring techniques and characteristics of fast and very fast transient overvoltages in substations and converter stations”, A2.63 – “Transformer impulse testing” and C4.61 – “Lightning transient sensing, monitoring and application in electric power systems”. He is a reviewer for the Electric Power Systems Research Journal, IEEE Transactions on Power Delivery and International Journal of Electric Power & Energy Systems. Currently he is involved in a research project “Development of an expert system for measuring lightning strokes parameters and protection of wind turbine blades in order to reduce failures and downtime” funded by European Regional Development Fund.
List of published papers including articles in international journals, scientific conference papers with international peer-review and professional studies for the industry is available at the following websites:
Croatian scientific bibliography (CROSBI):
Božidar Filipović-Grčić - CROSBI
Researchgate:
Božidar Filipović-Grčić - Researchgate

Dr. Normann Fischer

Dr. Normann Fischer received a Higher Diploma in Technology, with honors, from Technikon Witwatersrand, Johannesburg, South Africa, in 1988; a BSEE, with honors, from the University of Cape Town in 1993; an MSEE from the University of Idaho in 2005; and a PhD from the University of Idaho in 2014. He joined Eskom as a protection technician in 1984 and was a senior design engineer in the Eskom protection design department for three years. He then joined IST Energy as a senior design engineer in 1996. In 1999, Normann joined Schweitzer Engineering Laboratories, Inc., where he is currently a fellow engineer in the research and development division. He was a registered professional engineer in South Africa and a member of the South African Institute of Electrical Engineers. He is currently a senior member of IEEE and a member of the American Society for Engineering Education (ASEE). Normann has authored over 60 technical and 10 transaction papers and 20 patents related to electrical engineering and power system protection.

Tim Freiberg  

Mr. Freiberg joined AMSC’s Network Planning and Applications group in 2014. His responsibilities center around technical studies as well as development and maintenance of computer models. He is experienced in performing load flow analyses, harmonic analyses, and dynamic and electromagnetic transient simulations to design reactive compensation solutions for renewable, utility, and industrial applications. Prior to joining the Planning and Applications group he worked in AMSC’s Sales group as a Technical Inside Sales Engineer supporting AMSC’s STATCOM products. He earned his B.S. in Electrical Engineering from Milwaukee School of Engineering and is a member of IEEE.

Philipp Hackl

Philipp Hackl was born in Austria in 1995. He studied electrical power engineering at Graz University of Technology and spent one semester at TU Delft during his Master's degree. In summer 2020, he received his M.Sc. at TU Graz and started his Ph.D. at the Institute of Electrical Power Systems at TU Graz. His current research interests are transient stabilities of power electronic converters and transients during switching operations.

Aboutaleb Haddadi

Aboutaleb Haddadi received the B.Sc. and M.Sc. degrees in electrical engineering from Sharif University of Technology, Tehran, Iran in 2007 and 2009, respectively, and the Ph.D. degree in electrical engineering from McGill University, Montreal, Canada in 2015. From 2015 to 2020, he was a research associate with Polytechnique Montreal, Canada. Presently, he is a Senior Engineer Scientist with the Grid Operations and Planning R&D group at EPRI, U.S. His work focuses on renewables grid integration studies, transmission system protection and the impact of renewables, and power system modeling and simulation. He is the chair of CIGRE Working Group C4.60 on Generic EMT Modeling of Inverter-Based Resources.

Brian K. Johnson, Ph. D

Brian K. Johnson received his doctoral degree in EE at the University of Wisconsin-Madison in 1992. He is the Schweitzer Engineering Laboratories Endowed Chair in Power Engineering and a Professor in the University of Idaho ECE Department. His interests include power systems applications of power electronics, power system protection, and power system transients. Dr. Johnson is a registered professional engineer in the State of Idaho.

Pr. Y. C. Kang

Yong Cheol Kang (Senior Member, IEEE) received the B.S., M.S., and Ph.D. degrees in electrical engineering from Seoul National University, Seoul, South Korea, in 1991, 1993, and 1997, respectively. From 1999 to 2017, he was a Professor with the Department of Electrical Engineering, Chonbuk National University, Jeonju, South Korea. He was the Director of the WeGAT Research Center supported by the MSIP, Korea. In 2018, he joined the Yonsei University, Seoul, South Korea. His research interests include the development of control and protection techniques for wind turbine generators and wind power plants. He is the Editor of the IEEE Transactions on Sustainable Energy and a Member of the International Electrotechnical Commission Working Group TC88/WG27.

Suyash Kulkarni

After completing education in 1991 he joined family business ASHIDA ELECTRONICS (P.) Ltd, as R&D Engineer. He is currently holding the position of Chief Technology Officer (CTO) and Director R&D, at ASHIDA Electronics Pvt. Ltd. ASHIDA Electronics is a Research oriented company having turnover of 150Cr and employee strength of 400+ people. Under his leadership ASHIDA’s R&D team had developed range of protection and automation product required for medium voltage distribution network. Presently ASHIDA is manufacturing 25000, different type of protection relays per year, and supplied to all major electrical utilities in India and Indian Railway. ASHIDA also export their product in various countries such as Saudi Arabia, UAE, Kuwait, Europe etc.

Under his leader ship ASHIDA had developed and implemented a special traction protection scheme for Mumbai suburban train network, which is a world largest traffic density, train network. ASHIDA’s scheme was selected, and used for DC to AC conversion project of WR and CR Railway. Presently ASHIDA’s Protection Scheme and relay based SCADA system is successfully controlling and protecting Mumbai suburban train network from last 15 years. He also has patent in his name.

For Research and development activity, company receives a prestigious ‘National Award 2001’ through the hands of honorable Vice President of India"

Rohit Kunte

I work as a Senior Engineer II in the Electric System Planning group of MidAmerican Energy Company. Apart from planning activities I conduct special studies on as needed basis.

Andreia Leiria

Andreia received her Dipl. in Electrical Engineering in 2002 from IST – Technical University of Lisbon. She works at LABELEC – EDP Group, since 2000, having started in the Technical Studies Area conducting Power System Simulation Studies in a variety of areas: Insulation coordination; Grounding systems; Post-mortem incident analysis; Electrical Power Plant integration in the grid; Overhead line and underground cable interference with buried pipelines; Power quality and Reliability and Electromagnetic field evaluation. Currently she is Head of the Energy Consulting Department where the Technical Studies Area is included. She also collaborates with the University (IST) in master’s thesis co-orientation. She has been member of CIGRÉ/CIRED Working Groups on Electrical Power Quality, and she authored several scientific papers in Electromagnetic Transients. Her main research interest fields are Electrical Power Quality and Electromagnetic Transients.

Mr. Nolan Matthews

Mr. Nolan Matthews obtained a Bachelor of Science in Electrical Engineering from Louisiana Tech University in May 2021 with concentration in power and control systems and is currently pursuing a Master of Engineering degree with concentration in Electrical Engineering at the same university. His research focus is on power system protection, transients, and modeling. In addition to having three summers of experience as an engineering intern at a chemical manufacturing facility, he has also served as a teaching assistant at Louisiana Tech’s power and electronics labs. He is also the president of the Delta Gamma chapter of IEEE: Eta Kappa Nu, the Electrical Engineering Honor Society.

Jared Mraz

Jared Mraz P.E. received his B.S. degree in electrical engineering from the University of Idaho in 2007. Upon graduation, he joined the SCADA and Analytical Services Business Unit at POWER Engineers, Inc. in Clarkston, WA. He has spent the past 11 years performing a variety of electrical system studies, with an emphasis on protective relaying. His experience includes protective relaying for distribution, transmission, generation, and industrial applications, as well as testing of protection and control schemes using Real-Time Digital Simulation. Mr. Mraz is a registered professional engineer in Washington, Texas, and Louisiana and is a member of the WPRC planning committee.

N.K. Nathan

N.K.Nathan is a CTO of the engineering consulting firm KNR Engineers India Pvt. Ltd., based in Chennai, India. He is a high voltage engineer graduated from college of engineering Guindy in 1972. After working in BHEL, Best & Crompton and multinational groups as head of design & engineering, he founded KNR in 2003 to extend design and engineering services and system studies for T&D projects. He nurtured high voltage engineering group to venture into EMTP based analysis for high voltage problems in T&D network. He is a member of expert group on earthing in CBIP forum. He has interest in CDEGS based earthing solutions for GIS substations. He is widely travelled worldwide and had worked overseas as well.

Carlo Alberto Nucci

Carlo Alberto Nucci graduated with honors in electrical engineering from the University of Bologna, Bologna, Italy, in 1982. He is a Full Professor and Head of the Power Systems Laboratory of the Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”, University of Bologna. He is an author or coauthor of over 370 scientific papers published in peer-reviewed journals or in proceedings of international conferences. Prof. Nucci is a Fellow of the IEEE and of the International Council on Large Electric Systems (CIGRE), of which he is also an Honorary member, and has received some best paper/technical international awards, including the CIGRE Technical Committee Award and the ICLP Golde Award. From January 2006 to September 2012, he served as Chairman of the CIGRE Study Committee C4 System Technical Performance. He has served as IEEE PES Region 8 Rep in 2009 and 2010. Since January 2010, he serves as Editor-in-Chief of the Electric Power Systems Research journal (Elsevier). He has served as the President of the Italian Group of the University Professors of Electrical Power Systems (GUSEE) from 2012 to 2015. He is presently serving as Italian Representative in the Horizon Europe Mission Board Sub-group “Climate-neutral and Smart cities”, and as a member of the Technical Scientific Committee of the Regional Energy Plan of Emilia Romagna Region, Italy. Prof. Nucci is Doctor Honoris Causa of the University Politehnica of Bucharest and a member of the Academy of Science of the Institute of Bologna. He is also serving as vice-chair of the International Conference on Lightning Protection, ICLP.

Suved M. Pakade

Suved Mahadev Pakade was born in Amravati, India, in 1994. He received the B.E. degree in Electrical and Electronics Engineering from Sant Gadge Baba University, Amravati, India, in 2016 and M.Tech degree in Electrical Power System from Walchand college of Engineering, Sangli, India, in 2018. He is working in Ashida Electronics since 2018 as a development engineer for protective relays. His research areas have included protection algorithm and modeling, analysis, simulation and identification of electrical power systems and worked on EMTP-based simulation for protection system design, Dynamic testing of protective relay using HIL system.

Chandra Pallem

 I am Chandra Pallem working as a Principal Consultant in the Power Systems Engineering group with EnerNex since 2006 after receiving my doctorate in electrical engineering from Tennessee Technological University.

 My areas of expertise are transient studies and harmonic analysis of power systems.
 I have worked on a variety of projects for utilities and transmission systems such as capacitor switching, overhead line/underground cable energization studies, Transient Recovery Voltage (TRV) studies for circuit breakers, and reactor failure analysis.
 
I have also been involved with transient, harmonic, and power quality studies for various wind and solar power plants involving power system transient simulations, and modeling.

Theofilos Papadopoulos

Dr. Theofilos Papadopoulos received the Dipl. Eng. and Ph.D. degrees from the School of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2003 and 2008, respectively. He is currently an Associate Professor with the Power Systems Laboratory, Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece. His research interests include power systems modeling, power line communication, computation of electromagnetic transients and application of system identification techniques to power systems. Dr. Papadopoulos received the Basil Papadias Award at the IEEE PowerTech ’07 Conference.

Mr. Kaustav Jyoti Kalita instead of Dr. Sanjoy Kumar Parida

Research scholar Mr. Kaustav Jyoti Kalita who worked on project with Dr. Sanjoy Kumar Parida. Mr. Kalita is working with POWERGRID Corporation of India Limited as Engineer and is currently doing Ph.D under professor.
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Dr. Sanjoy Kumar Parida is presently working as an Associate Professor in the Department of Electrical Engineering, IIT Patna. He has completed his PhD in Power Systems Group in the Department of Electrical Engineering, IIT Kanpur in the year 2009. During his PhD program, he was awarded the senior research fellowship (SRF) by Power Management Institute, NTPC Ltd. Noida in the year 2007. In this program, has devised a novel frequency regulation mechanism based on frequency linked free governor mode of operation for Indian electricity supply industry. He has received Young scientist award by DST, Govt. of India in the year 2010 for the project Integration of Distributed Generation System to Improve the System Reliability. He has received Bhaskar Advanced Solar Energy (BASE-2015) Research Fellowship awards by Indo US Science and Technology Forum (IUSSTF), DST, Govt. of India in the year 2015. In this program, he has worked on Cost based dynamic load dispatch in parallel converter based microgrid. Also, he has received young faculty research fellowship (YFRF) award by Digital India Ltd., Ministry of Electronics and Information Technology (MeitY), Govt. of India in the year 2019.

Above these, he has handled nine major projects as PI or Co-PI sponsored by DST, DietY etc. Presently, he is one of the PI in the teaching and learning center (TLC) on internet of things (IoT) sponsored by MHRD. In TLC, he has experience of developing Smartgrid and Smart building laboratories. He has authored many papers in many of the international journals and presented lot of his works in many international conferences. He is a senior member of IEEE; and is working as reviewer and technical advisor in many international journals and conferences.

Mr. Neeraj Patel

Born in 1983 in Ahmedabad, India. He received his Graduation in Electrical engineering in 2007. He joined Adani Power Group in Year 2008 and He is working in centralized Protection group. His main profile is Power System Studies (Transient and Stability studies), Power System Protection and Generator Excitation System

Bikrant Poudel

Bikrant Poudel (Graduate Student Member, IEEE) received his B.S. (2013) in Electronics and Communication Engineering from Tribhuvan University, Kathmandu, Nepal, and M.S. (2017) in Electrical Engineering from the University of New Orleans, New Orleans, USA. He is currently working on his Ph.D. in Electrical Engineering at the University of New Orleans. His current research interest includes grid-connected P.V. and analytical machine modeling.

Dr. Milton Quinteros

Dr. Milton Quinteros received a Bachelor of Science in Electrical Engineering in May 2007, and his Master of Science in Electrical Engineering in May 2009 from the University of New Orleans. He finished working on his Doctoral degree at the same University in December 2014. He is currently working in Entergy Services Inc. as Sr. Engineer in the Standards and Design Group. His research areas include Digital Telecommunications, Data Base design, Digital, and Communications for Power System Protection and Automation. Dr. Quinteros is a member of IEEE since 2007, member of Eta Kappa Nu chapter Iota Rho, and member of Tau Beta Pi Epsilon chapter since 2012.

Prof. Dionisio Ramirez

Dionisio Ramirez received his M.S. degree in industrial engineering and Ph.D. degree in electrical engineering from the Universidad Politécnica de Madrid (UPM), Madrid, Spain, in 1997 and 2003, respectively. He is with the Centro de Electrónica Industrial (CEI) at the Universidad Politécnica de Madrid (UPM) where he is Associate Professor and has recently been granted the promotion to Full Professor. His research current interests include control of renewable power plants (wave, wind, and photovoltaic energy), and control of MMCs, topics on which he has personally published 40 JCR papers and holds 16 patents.

Mr. Toby Russell

Mr. Toby Russell is a graduate student in the Electrical Engineering Department at Louisiana Tech University. He earned a Bachelor’s degree in Electrical Engineering with an emphasis on power and control systems from Louisiana Tech University in May of 2020. His senior capstone project focused on the design and construction of a megohmmeter insulation tester that was capable of generating a test voltage of 500 volts DC and measuring resistances in the megaohm range. His graduate research is focused on power system transients and the modeling and testing of traveling-wave relays. Toby also has years of in-the-field experience installing and troubleshooting access controls systems.

Mr. Umesh Sen

Mr. Umesh Sen has received his B.E. degree in Electrical Engineering from University College of Engineering, Rajasthan Technical University Kota, India, in 2009 and M.Tech degree in Power System from Delhi Technological University, Delhi, India, in 2011. He joined POWER GRID CORPORATION OF INDIA LIMITED, Gurgaon, India in year 2011.

He is looking after the Real Time Simulation Lab in Powergrid Advanced Research and Technology Centre (PARTeC) Manesar, India. He is extensively involved in various system studies conducted in POWERGRID for improvement and implementation of new technology in Network. He is currently working on EMT study of insulation coordination of GIS and hardware in loop studies in RTDS. Since the establishment of the Real Time Simulation Lab, he has been the Team Lead in various studies related to Optimization of Transmission System Protection Settings.

During the span of eight years of professional journey, he was involved in studies of world’s first 1200kV National Test Station (NTS) Bina in India, primarily EMT study for Assessment of Transient Recovery Voltage for 1200 kV Circuit Breaker and electromagnetic field studies (EMF). In addition to this, he was responsible for detailed engineering and implementation of IEC 61850 based Process Bus Implementation at 400kV Power Grid Bhiwadi Substation. He has also worked in the Transmission System Planning department of Powergrid, where his major contribution has been Optimized Insulation Coordination of 765kV Neutral Grounding Reactor in POWERGRID. He published several papers in various area in international and national conferences.

Rafael Castillo Sierra

Rafael de Jesús Castillo Sierra received his degrees in Electrical Engineering (2012) and Master in Electrical Engineering (2015) from Universidad del Norte (Barranquilla, Colombia). He is Assistant Professor at the same university, leading courses in Electrical Machines, Circuit Theory, and Power Systems Analysis. In 2019 he was awarded the Fulbright Scholarship to carry out his doctoral studies in The United States. He is currently pursuing a Doctorate in Electrical Engineering at the University of Wisconsin-Madison, at the “Wisconsin Electric Machines and Power Electronics Consortium” (WEMPEC). There he carries out research in the area of application of power electronics in power systems, specifically, he is studying the application of the Modular Multilevel Matrix Converter (AC/AC Converter) as a way to improve utilization and controllability in transmission lines.

Luiz Felipe Ribeiro Barrozo Toledo

Luiz Felipe Ribeiro Barrozo Toledo is an Electrical Engineer, Master in Electrical Engineering and Doctor in Engineering. He works as a senior researcher at LACTEC working in the development of high voltage equipment, systems simulation, sensing and optical devices. He participated and coordinated several R&D projects, is periodical reviewer and editor of Espaço Energia – Brazilian Open Journal of Energy.

Fabio Tossani

Fabio Tossani (S’15-M’16-SM’21) received the B.S. (Hons.), M.S. (Hons.) and Ph.D. degrees in electrical engineering from the University of Bologna, Italy, in 2010, 2012 and 2016, respectively. He is Assistant Professor at the Power Systems Laboratory of the Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi”, University of Bologna. His research interests are power system transients, lightning electromagnetic pulse interaction with electrical networks, power systems protection and the integration of renewables in power distribution networks. He is an Editor of Electric Power Systems Research and Associate Editor of Electrical Engineering – Archiv fur Elektrotechnik.

Ivo Uglešić

Ivo Uglešić works as a professor at the Faculty of Electrical Engineering and Computing Zagreb. Acting as a full professor, he has cooperated with different institutions and companies in Croatia, throughout the region and along the world, solving complex technical problems and successfully applying the results of his researches and solutions in practice. His scientific and professional work includes areas of high voltage engineering, overvoltage protection, electric power transmission and electric traction. In addition, he is the head of the High Voltage Laboratory at the Faculty of Electrical Engineering and Computing Zagreb, which is accredited by the Croatian Accreditation Agency. He is the author of numerous scientific and professional papers as well as many studies and technical solutions that have been implemented in the practice.

Prof. Uglešić was granted by the International Council on Large Electric Systems – CIGRE in 2018 for his remarkable work in the study committee „System Technical Performance“ with the title of Fellow, assigned to the most prominent members. In 2012. professor Uglešić was awarded with the Golden Plaque "Josip Lončar" for his outstanding teaching and research work at the University of Zagreb, Faculty of Electrical Engineering and Computing. Throughout the teaching activities, professor Uglešić successfully transferred knowledge to students, young researchers and professionals. Numerous master's and doctorate students graduated under his mentorship, many of which are now prominent scientists and experts in the industry, institutes and universities.

Stefano Vitali

Stefano Vitali – ABB Electrification Distribution Solution – Field Application Manager
A long and well-consolidated technical-managerial experience in the design and quality management of electrical/electronic systems and products has colored my almost 20 career as electrical engineer.

Master’s degree in electrical engineering in December 1994.
Electrical Engineer (ENEL, from 1996 to 1997)
Project Engineer in railway vehicles projects (Firema Trasporti SpA, 1997-200)
Design manager of electrical systems of textile machines (Itema SpA, 2000-2006)
Electronic Products Quality Manager (Itema SpA, 2006-2007)
Electronic Quality Manager (ABB SpA, 2007-2021)
Field Application Support Manager (ABB SpA, from May 2021)

Davor Vujatovic

Dr. Davor Vujatovic is a Chartered Electrical Engineer with an extensive knowledge of the design of EHV/HV power transmission and distribution systems including the equipment required to support major power and rail infrastructure projects in the UK and overseas.
Principal professional interests are system transients, power quality, flexible AC transmission systems and system dynamics.

Dr. Davor Vujatovic received his Bachelors Degree in Electrical Engineering (Electrical Power Engineering) from Zagreb University, Croatia in 1993 and his Doctorate in Electrical Power System Engineering (FACTS and Power Quality) in 2010.

After graduating and completing the postgraduate training, he began his career at Mitsubishi Electric in the UK where he progressed to a senior position, focusing mainly on EHV GIS substation design, protection and control. He moved to Toshiba International in 1999 where he continued his career as a GIS substation designer and also started his involvement in FACTS and HVDC. From 2001 until 2005 he was responsible for the design, construction and commissioning of the SVCs and dynamic load balancer for the Channel Tunnel Rail Link.
From 2005 onwards, he is working as an independent consultant specialising in computer simulations, system studies, concept and detailed system designs.
His most recent projects include detailed technical assessments of transmission and distribution networks, wind farms, large industrial installations and railway electrification. In particular the studies related to the system transients, dynamics, power quality and FACTS devices.

Dr. Davor Vujatovic is a published author in both National and International journals on electrical power systems, contributor to a number of books including chapters for the United Nations encyclopaedia.
He is a Fellow of the IET and a senior member of the IEEE. He is a member of several CIGRE working groups and UK Energy Networks Association review panels. He is a technical reviewer of papers and reports submitted for publication in CIGRE, IET and IEEE brochures and journals.