Feedforward control of output current for three-phase voltage source inverter (VSI) with transformer

This paper concentrates on the load disturbance in three-phase voltage source inverter with an output transformer. The transformer could be smaller when placed behind the LC filter. But the voltage drop on the leakage impedance of transformer may destroy the quality of output voltage. Output current feedforward control is proposed to eliminate the influence of load disturbance. The distinct features of the proposed feedforward control scheme are error-free steady-state fundamental output and fast dynamic response. Finally, experiment results are given to verify the feasibility and validity of the proposed control strategy.