Access to EMTP user presentations, webinars, and slide deck presentations.
22 presentations for Cable:
Author(s): Jin Yang - Ener-Phase Solutions
Type:Technical Presentation
Date: 2021-06-21
Abstract
A case study will be presented demonstrating modeling of overvoltage in a moderately sized system involving medium voltage vacuum breakers, cables and transformers. The focus is on simulating high fre... see morequency overvoltage generated by circuit breaker prestrikes and re-ignitions and evaluating the impacts on transformer insulation.
-Results obtained from a customized breaker TRV model which is capable of controlling the capability of switching high frequency current will be presented.
-The methodology of analyzing severity of overvoltage in the frequency domain was applied in this project. Results and discussions regarding frequency domain analysis will be shared.
-Simulation results regarding typical system configurations with variation of key parameters such as cable lengths, load power factors will be briefly presented.
-Application of EMTP study results in assisting equipment specification, as well as overvoltage mitigation methods including optimizing switching sequences, necessity of snubber circuits will be discussed.
-Case specific strategies to improve simulation speed and work flow with EMTP will be introduced and discussed.
Author(s): Sofía Aparicio, Andrea Pizzini, Nicolás Morales - UTE
Type:Technical Presentation
Date: 2021-06-21
Abstract
In order to obtain the distances required to perform live working maintenance on the Uruguayan transmission network under secure conditions, electromagnetic transient (EMT) studies are conducted to ob... see moretain the maximum switching overvoltage that can be found in 500-150 kV transmission network. Two different approaches were considered for these studies. On one hand, a simple approach is used, analyzing line switching transients on simplified two line network models. On the other hand, a detailed approach is considered, analyzing line switching overvoltage transients on a complete network model.
This complete model considers 500 kV and 150 kV overhead lines, 500/150 kV transformers, cables, reactive power shunt compensation, hydraulic and thermal generators. Electromagnetic transient studies and the complete network model are performed in EMTP software. Finally, a comparison between the results obtained considering each approach is performed.
Author(s): Ilhan Kocar
Type:Technical Presentation
Date: 2020-12-14
Abstract
<p>This presentation introduces the new Windband Model, capable of eliminates the modeling problems encountered with the existing ULM approach.</p><p>
Ov... see moreerview: - Time domain Solution o The Wideband (WB) Model coded in Fortran - WB Fitter o Executable, coded in MATLAB o Off line, Frequency Domain (FD) system identification - Implementation Notes with Theoretical Explanations o Follows the code with all necessary mathematical equations
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Author(s): Ilhan Kocar, Polytechnique Montréal
Type:Technical Presentation
Date: 2020-11-20
Abstract
<h6 class="text-black" style="padding-bottom: 30px; padding-top: 30px; text-align: justify;">Speaker: <strong>Ilhan Kocar</strong... see more>, <em>Polytechnique Montréal</em></h6> <p class="text-black">The new WB model encapsulates many improvements including state-of-the-art research results. It eliminates the modeling problems encountered with the existing universal line model (ULM) approach.<br> In the new model, there is no limitation on the number of conductors. For symmetric coaxial cable systems with several cables, numerical problems are avoided by using the new cable correction function. The newly added DC correction scheme together with frequency band partitioning ensures high precision both at low frequencies and high frequencies. Frequency partitioning also improves the numerical conditioning of the system of equations. Unrealistic delays are avoided thanks to the new routines for the identification and adjustment of time delays. The delay adjustment is a search routine with boundaries for optimized fitting.<br><br> The state space formulation in time domain is reformulated using a precise discrete integration method. It minimizes the numerical integration and interpolation errors. This allows achieving stable simulations with larger time steps. The object oriented programming approach with vectorized variables and new memory allocation routines significantly improves the simulation speed and use of memory. The new initialization routines allow seamless transition from steady state solution into time domain simulations.</p></div>
Author(s): Sébastien DENNETIERE, RTE – Centre National d’Expertise Réseaux
Type:Technical Presentation
Date: 2020-11-20
Abstract
<h6 class="text-black" style="padding-bottom: 30px; padding-top: 30px; text-align: justify;">Speaker: <strong>Sébastien DENNETIERE&... see morelt;/strong>, <em>RTE – Centre National d’Expertise Réseaux</em></h6> <p class="text-black">A high voltage direct current (HVDC) grid is a power transmission system which consists of multiple HVDC terminals interconnected through DC lines. The advantages of a DC grid are increasing system flexibility and reliability and providing redundancy at a lower cost by sharing resources, resulting in lower power losses. In order to test and compare technical solutions that can be applied on a realistic DC grid, CIGRE B4 Study committee decided to propose a VSC based DC Grid test system with ac and dc parts with all input data suitable for EMT simulation. This first benchmark has been developed in 2014 in EMTP and different simulation tools in order to validate the completeness of data provided in the Technical Brochure #604. The test system has 11 AC/DC VSC converters, 2 DC/DC converters and 2 DC voltage levels (±400kV and ±200kV).<br><br> The main purpose of the test system is to provide a common basis for all CIGRE SC B4 WGs that work on the research of DC grids. This benchmark model generated a high interest. Some limitations on this benchmark (topology, equipment included…) have been identified so far. In order to provide common study platforms to meet the most different HVDC grid study purposes and needs, seven HVDC grid test models have been established by the B4-72 CIGRE WG. These models have been designed to cover most HVDC grid applications including collection, integration and transmissions of onshore/offshore renewable power generation over long distance, LCC-HVDC grids, LCC-VSC hybrid HVDC grids, AC system interconnections for different types of studies with appropriate and applicable sizes. The presentation will address the issues related to the modeling of the largest DC grid test system proposed by this WG. This grid model includes 22 VSC converter stations, 4 LCC converter stations, PV and wind generations. </p>
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