Abstract
This paper focuses on how to suppress the effect of unbalanced load on the output voltage distortion of the auxiliary inverter. The auxiliary inverter in this paper uses a split-capacitor inverter topology with a midline inductor to suppress the effect of unbalanced load. In this paper, the auxiliary inverter is split into three independent single-phase inverters, respectively, to control the fundamental impedance of each single-phase inverter to obtain excellent output voltage waveform. Each single-phase inverter control system uses voltage and current double-loop control strategy, the voltage outer ring with a new resonant controller, not only can inhibit the unbalanced load on the auxiliary inverter output voltage distortion, and can balance the split capacitor voltage. Finally, a virtual DSP system based on S-Function is constructed. The simulation results show that the new resonant controller can suppress the effect of unbalanced load on the output voltage distortion of the auxiliary inverter.
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