Operation Analysis and A Game Theoretic Approach to Dynamic Hybrid Compensator for V/v Railway Traction System

Due to the train load stochastic jumps, negative sequence currents (NSCs) are unpredictably brought into power grid, which may attack the power system and damage vital devices. To enhance the compensation capacities and improve the power quality, a hybrid scheme is studied in consideration of load stochastic jumps, composed of railway power conditioner, thyristor switched capacitor, and thyristor switched reactor. First, the load discrete jump model and its compensation principle of V/v railway traction system are analyzed to design the hybrid compensators and the capacities. Then, based on the attack-defense game theory, a two-level optimized hybrid controller is proposed to keep the power system affirmative for any train load attacks. In the hybrid system, defender 1 is a discrete strategy that can be early executed by finite logic to minimize the power demands, and defender 2 is a continuous strategy that can be lately controlled by optimal control to minimize NSCs. By this dynamic game, an optimized hybrid compensation can be realized. Finally, simulations and experiments are completed to prove the compensation abilities of the hybrid system and the effectiveness of the hybrid control strategy.