EPFL EE Distinguished Lecturer Seminar, Prof Jean Mahseredjian, Lausanne, May 1st,.2014

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Ecole Polytechnique Fédédale de Lausanne (EPFL), Lausanne, Switzerland Institute of Electrical Engineering (EE) EE Distinguished Speaker Seminar Title : Computation of power system transients: towards new levels of sophistication Prof. Jean Mahseredjian, École Polytechnique de Montréal - http://www.polymtl.ca/recherche/rc/en/professeurs/details.php?NoProf=340 Abstract: The complexity of modern power grids requires using advanced computer based simulation methods for design, operation and post-mortem analysis stages. Numerical models and solution methods play dominant roles in technological advancements in modern power systems. The needs for simulation capabilities increase significantly faster than the capability of researchers to deliver new simulation methods for solving increasingly complex problems. This presentation is on the computation of power system transients using detailed circuit level analysis methods. A unified and wideband vision is presented and includes unbalanced-multiphase load-flow solution, initialization, electromechanical transients and electromagnetic transients. The computation of electromagnetic transients (EMT) offers highest accuracy levels and allows delivering wideband power system models. A multi-time frame vision is proposed for combining various solution techniques into a single environment and for a single data set. Computational speed and accuracy must become adaptive according to grid regions and the frequency content of studied phenomenon. The advent of multi-core processors, with several CPUs accessing shared memory, opens the path to significant innovations in the development of very efficient new algorithms for the computation of power system transients. Parallel computing allows reinventing power system simulation methods and models. New numerical methods must be invented to harvest the power of parallel computations and it is envisioned that such methods can deliver advanced capabilities, such as fully interactive numerical simulators alike ancient analog simulators, extension of the core of EMT-type solution to the simulation of very large scale power systems and elimination of numerical gaps between off-line and real-time simulation tools. A key aspect in parallelization is the decoupling of network equations. Such equations are solved using sparse matrix techniques. Various formulation methods can be used to achieve network tearing. It is shown that diakoptic analysis can be related to modified-augmented-nodal analysis which in its turn is related to hybrid analysis. This talk also presents a new chair project at École Polytechnique de Montréal on the multi time-frame simulation of transients for large scale power systems. The industrial partners of the chair project are Électricité de France, Hydro-Quebec, Opal-RT and RTE-France. Short bio: Jean Mahseredjian, Professor École Polytechnique de Montréal, Ph. D., IEEE Fellow Jean Mahseredjian graduated from École Polytechnique de Montréal with a Ph. D. in 1991. From 1987 to 2004 he worked at IREQ (Hydro-Québec) on research and development activities related to the simulation and analysis of electromagnetic transients. In December 2004 he joined the faculty of electrical engineering at École Polytechnique de Montréal. He is the creator and main developer of the EMTP-RV software for the simulation of electromagnetic transients.