Program of the day:
|08:30||Welcome coffee and registration|
|09:00||Opening remarks (POWERSYS)|
|09:15||EMTP-RV: Recent development and road map
Jean MAHSEREDJIAN - Ecole Polytechnique de Montréal, Québec, Canada
Chris DEWHURST - Capilano Computing, Vancouver, Canada
Emmanuel RUTOVIC - Powersys, France.
|10:00||Improvement of wideband line and cable models in EMTP-RV: short-term and long-term research
M.I. LAFAIA SIMÕES, M.T. CORREIA DE BARROS, IST/Techical University of Lisbon, Portugal
Prof. Jean MAHSEREDJIAN, École Polytechnique de Montréal, Québec, Canada
This presentation is on research works related to Wideband transmission line and cable models. It starts by presenting the currently available models in EMTP-RV and demonstrates the advantages of the Wideband modeling approach over the standard Frequency dependent model. Benchmark examples are presented for testing the models and demonstrating limitations.
|11:00||High-frequency power transformer modeling
Prof. Ivo UGLESIC, Ph.D., Bozidar FILIPOVIC-GRCIC, Ph.D., Bruno JURISIC, Department of High Voltage and Power Systems - Faculty of Electrical Engineering and Computing | University of Zagreb, Croatia
Alain XEMARD, Ph.D., EDF R&D - Clamart, France
The detailed study of high-frequency over-voltages propagating inside the electrical systems of a power plant requires a precise modeling of power transformers at high frequencies. These over-voltages may originate from lightning overvoltage propagating along the transmission line and crossing the step-up transformer, they may originate also for instance from vacuum circuit breaker switching. Power transformers possess several natural frequencies and steep front over-voltages are particularly dangerous for them because a large part of the applied over-voltage is concentrated on the first turn of the windings.
|11:30||Modeling of hvdc-mmc transmission system for electromagnetic transients
Hani SAAD, École Polytechnique de Montréal, Québec, Canada
Voltage Source Converter (VSC) technologies are rapidly evolving and increasing the range of applications in a variety of fields within the power industry. Existing two- and three-level VSC technologies are being superseded by the new Modular Multilevel Converter (MMC) technology for HVDC applications. Computational burden caused by detailed modeling of MMC-HVDC systems in electromagnetic transient type (EMT-type) programs complicates the simulation of transients when such systems are integrated into large networks. This presentation develops and compares different types of models for efficient and accurate representation of MMC-HVDC systems. The results show that the use of a specific type of model will depend on the conducted analysis and required accuracy.
|14:00||Sheath over-voltages in cross-bonded underground transmission lines
Antoine NAUD, Gaëtan GUTIERREZ, RTE, France
Wilfried FRELIN, Minh NGUYEN TUAN, EDF R&D - Les Renardières, France
Screen cross-bonding is generally applied to underground cables used for bulk power transmission. The cable sheaths and the sectionalising joints are protected against transient overvoltages by surge arresters, installed at cross-bonding locations, at least close to the links ends. This paper presents the main results of a comprehensive study aiming at assessing the magnitude of the over-voltages likely to stress the cable sheath and joints, in order to define possible improvements in the design of cross-bonding.
|14:30||Development of a reliability tool for the analysis of electromagnetic transients with EMTP-RV
Ronan BESREST, Jules DRUET, Capsim, France
A coupling has been achieved between EMTP‐RV and probabilistic software in order to conduct reliability studies applied to electromagnetic transients analysis.
|15:30||Analysis of audio-frequency harmonic interference currents in railway track safety systems using EMTP-RV steady state solution
Doug MADER, USA
State-of-the-art technology in traction power systems employing PWM converter-inverter power electronics introduces the potential for harmonic interference to track safety systems operating in the audio-frequency band. EMTP-RV's harmonic steady-state initialization capability provides a useful tool for analyzing the potential for this interference. Details around modeling considerations are discussed as well as guidance toward further development needs for the program.
|16:00||Co-simulation tool for EMTP-RV
Xavier LEGRAND, EDF R&D - Clamart, France
A DLL based co-simulation tool is presented. An EMTP/Simulink transient stability case is used as an application example : a machine connected to the network is modeled on EMTP, whereas the control is running on Matlab/Simulink. The advantages and drawbacks of co-simulation for electric power engineers are discussed.
|16:45||End of the EMTP User Group Meeting|