Research of Electrified Railway Harmonic Suppression Based on H-infinity Control

Because of using the nonlinear high-power, single-phase, multi-step full wave or bridge rectifier electric locomotive in electrified railway, the electrified railway traction power supply system has serious power quality problems, which affect safe operation of the electrified railway and impact the local power grid adversely. Aiming at the electrified railway power quality problems, a homogenization model of the inverter is established, and the robustness of active power filter is analyzed based on the Hinfinity control theory. Simulation results show that the harmonic control effect of electrified railway is good based on H-infinity control. Under various parameters perturbation, THD is changed relatively small, the system can well follow load changed and has strong robustness. So based on H-infinity control of active power filter in electrified railway harmonic suppression has wide application prospects.