Application of PR Regulator to SPWM Inverters

Aimed at the errors of amplitude and phase occurred during the conventional regulator tracking the AC signals,a PR regulator that has a good performance of AC tracking and controlling was proposed.A transfer function of the PR regulator was obtained with theoretical analysis,and applied to the single-phase SPWM inverters digitally.The simulation and experiment results show that the tracking with zero steady-state errors for AC reference and a favorable output waveform can be realized by using the proposed inverter system.