Technical Presentations

Slideshow of the projects from our grand prize winners857

Abstract
During this webinar, our two winners of the EMTP® Research Contribution Prize Program 2021 will present their work. The aim of the award is to recognize student contributions to the technology associ... see moreated with power system transients. The two competition categories are:
- Best accepted IEEE, IET, PSCC, EPSR or IPST journal or conference paper on EMT simulations;
- Best EMTP® model developed.

Discover our winner and the topics of their presentation:

o Husam Samkari, Ph.D. and P.E. in Electrical Engineering
Impact of Distributed Inverter-Based Resources on Incremental Quantities-Based Protection

Abstract:
This paper studies the impact of distributed inverter-based resources (IBR) on time-domain incremental quantities-based relays. One implementation of the incremental quantities for protection is a high-speed sub-cycle directional element. The incremental, also known as superimposed, quantities are fault-generated instantaneous components of voltages and currents. The directional element indicates fault direction based on the transient voltages and currents’ relative polarities. It is essential to ensure that the element does not fail to indicate the correct direction if IBRs fault current responses impact the quantities. IBRs’ fast control response impacts the current quantities by changing both magnitude and angle.

This paper characterizes the incremental quantities-based relay response to IBRs’ nonlinear fault currents. A modified IEEE 34-bus distribution with an IBR system is modeled and simulated using the electromagnetic transients program (EMTP) for demonstration.

o Rafael Castillo Sierra, Electrical Engineer, Ph.D. Student
Model category for his model on Power System with a Transmission Line operating at low frequency

Abstract:
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.

Tag(s): EMTP, Prize winners, IBR, Protection, Power system, Transmission Line, Low frequency,

EMTP Development Roadmap: New Line/Cable data in EMTP 4.2829

Abstract
1. Brief review of transmission line equations

2. Per unit length parameter
- Traditional line data and cable data
- MoM-SO and Extended TL theory

3. New Line/Cable dat... see morea
- Mask options
- Application examples

Tag(s): EMT simulations, transmission, cable data,

EMTP Development Roadmap: PSS/E Import Tool in EMTP 4.2830

Abstract
1. Custom device usage
- New option which allows to import a user-defined device
- Scripts may be called to process the parameters of the RAW, SEQ and DYR files
- The user customer devi... see moreces file section provides the interface

2. Import only specific part of a grid
- This new option allows user to import only specific parts of the RAW file
- PSS/E is required to use this option

Tag(s): EMT simulation, PSSE, grid, import tool

EMTP Development Roadmap: Real-code DLL Interface828

Abstract
Real-code models/DLLs
- Exact copy of a real control implementation
- Original source code of a controler


Why use real-code DLLs in EMT simulations?
- Ultimate accurac... see morey (same code as onsite)
- Manufacturer's intellectual property is protected


Applications:
- Modeling of windfarms, PV farms, HVDC, exciters, etc.

Tag(s): DLL Interface, control implementation, EMT simulations

Simulation of switching Overvoltages and Field validations 754

Abstract
<p>This presentation is on the simulation of switching overvoltages on transmission lines with trapped charge, validation of EMTP line models, modeling of prestrike in statistical simula... see moretion studies and discussion of necessary simulation practices by means of validations with field tests.</p>
<p>Objectives: - Identify simulation practices to produce the field measurements en EMT simulation - Validation of line models - frequency dependence - Discussion on modeling approaches, simulation practices, sensitivity to electrical parameters - Evaluate maximum overvoltages - How to perform statistical simulations, model prestrike and include corona in statistical simulations efficiently.</p>