A Three-phase Unified AC Power Quality Control Device

This article studies the design method of inverter power circuit for three-phase unified AC power quality control device, and designs IGBT buffer circuit and driving circuit, as well as the DC link overvoltage protection and inverter AC side overcurrent protection circuit of the entire system. Finally, the joint amplitude waveform and joint experimental waveform of the entire experimental device were presented. Simulation and experimental research results showed that the three-phase unified AC power quality regulation device can achieve the functions of eliminating load reactive power and harmonic current, and bi-directional adjustment of load voltage. The designed experimental system can meet the design requirements, and the control method of separately controlling the series voltage regulation link and the parallel active filtering link is reasonable. The results show that the detection method is effective. And experimental research was conducted on the designed parallel active filter, and the results showed that it can effectively eliminate load harmonics and reactive currents, and can meet the design requirements.