Design of the Feed-Forward Controller of a Single-Phase AC/DC PWM Converter in Parallel for High-Speed Trains

This paper proposes a design method of the feedforward controller to improve on the non-interference control performance of a single-phase AC/DC PWM converter in parallel for high speed trains. The feed-forward controller compensates interference phenomenon generated by switching converter in parallel. As the secondary leakage inductance in transformer is changed by operating conditions of the transformer, the gain value of feed-forward controller is calculated by estimating the changed leakage inductance. The estimation procedure of the boost inductance is only based on the variation of input current and the input AC voltage measurement. The estimated boost inductance is optimized by the least square method. Then the controller with gain value can exactly compensate the interference phenomenon. The validity of proposed technique is verified through the Matlab Simulink simulation results.