Comparison between DB control and Dual-Loop PR control for collapsed H-bridge single-phase 400Hz power supply

Due to total harmonic distortion and the time delay of the digital controller in the condition of a single-phase 400 Hz power supply, the traditional proportional-integral-differential controller cannot track the sinusoidal waveforms with zero static error. To improve the performance, the deadbeat control and the proportional-resonant control have been analyzed and contrasted in this paper. The results show that deadbeat control has rapid response but sensitivity to the accuracy of the model and parameters. On this basis, a Dual-Loop Proportional-Resonant control is proposed, which is exercised with the high switching frequency to provide sufficient control bandwidth to reduce the 3rd, 5th and 7th order harmonic. Further, the experiments have been performed on a single-phase 400 Hz power supply prototype. The results show that the Dual-Loop Proportional-Resonant control feeding linear/nonlinear and disturbance loads are satisfactory.