A Hybrid Electrical Magnetic Power Quality Compensation System With Minimum Active Compensation Capacity for V/V Cophase Railway Power Supply System

To solve the power quality problem in a V/V cophase railway power supply system, a hybrid electrical magnetic power quality compensator (HEMPQC) based on magnetic static var compensator (MSVC) and hybrid power quality compensator (HPQC) is proposed in this paper. Compared with conventional HPQC, the proposed HEMPQC could keep the active compensation capacity minimum to any load condition. The output current of MSVC is conducted to make the active compensation capacity minimum. The coupling branch impedance optimum design procedures are deduced. Based on the instantaneous current detecting and reactive current distribution method, the collaboration control strategy is proposed for HEMPQC to achieve the dynamic tracking of the reference signals. Finally, simulation and experimental results have verified the proposed hybrid compensation system and compensation method effectively.