Dr. Yi Zhang joined RTDS Technologies Inc. in 2000, where he now serves as Vice-President R&D and Chief Technology Officer (CTO). He has over 30 years of experiences working in power system simulation and analysis. His expertise includes Real Time EMT Simulation, Voltage Stability and HVDC, etc. As a principal member of the RTDS development team, he developed many simulation models on RTDS Real Time Simulator in the past 23 years. At present, Dr. Zhang leads the research and development activities in RTDS Technologies. He is an active member in multiple CIGRE B4 working groups and chairs the IEEE PES taskforce on “EMT Simulation of Large Power Systems”.  He also serves as an adjunct professor at the University of Manitoba Canada and Hunan University China, and an editor of IEEE Transactions on Power Delivery. Dr. Zhang is a Fellow of IEEE, a Fellow of Canadian Academy of Engineering, a Fellow of Engineering Institute of Canada and a registered professional engineer in the province of Manitoba.

Topic of the Speech: Theoretical Foundation of Frequency Domain Impedance Analysis of Wide Band Oscillations

Abstract:This presentation comprehensively discussed various domain transformations in  wide band oscillation stability analysis, and explained the intrinsic relationship between various domains (dq0, PN0, Sequence, etc.). Based on this basis, the mathematical roots of frequency coupling that occurs in frequency scanning of power electronic circuits are discovered. This research expanded and consolidated the theoretical basis of wide-band oscillation frequency domain impedance analysis. The ideas and implementation techniques of wide-band oscillation analysis software developed on a real-time simulation system are introduced. The presentation attempts to clarify some difficult but essential concepts in wide-band oscillation analysis of power systems in simple language, hoping to enhance the audience's understanding of this complex phenomenon and its analysis tools.