High Performance Repetitive Controller for Eliminating Periodic Disturbance of Inverter with Unbalance Load

The paper has researched on the control of three-phase inverter with unbalanced load. Based on the analysis output characteristic of inverter with unbalanced loads, the method of restrain the unbalance output voltage was researched, and then the models of inverter respectively in dq-frame and αβ-frame were established. According to the models and the characteristics of traditional dual-loop control and repetitive control, a new control strategy in which the dual-loop control in dq-frame was in parallel with repetitive control in αβ-frame was proposed. Based on the model in dq-frame, the dual-loop control of inverter was designed; and based on the model in αβ-frame, the repetitive controller of inverter was designed. The results of simulation in MATLAB and the experiment based on DSP - TMS320F28335 have compared the control effects of dual-loop control, repetitive control and the compound control proposed in this paper. And it has proved to be a correct and available control strategy.