New Repetitive PD Control Method for Medium-Frequency Inverter

This paper introduces a Repetitive PD (Proportion and Differential coefficient) Control method for high performance SPWM medium-frequency inverter. And this method is used in the 400 Hz and 5.5 kW inverter based on TMS320F240 DSP. Repetitive controller can obtain enough stability and satisfactory harmonic rejection. And at the same time, the PD controller can improve system dynamic performance. Experimental results prove that this method can achieve not only low harmonic aberrance during steady-state operation but also good transient response subject to load step change.