Minimization of the DC Component in Three-Phase Transformerless Grid-Connected PV Systems

At present, the research on the quality of micro-grid power at home and abroad is still at the initial stage, which focuses on the study of the power quality characteristics of micro-sources. There is little research on the quality control of micro-grid power and the power quality adjustment device for microgrid. In particular, there is no literature on the power quality of the microgrids containing the power quality regulator, and there is no in-depth study of the power quality during its operation. In this aspect of the research and exploration process, this paper summarizes the special problems of multi-inverter microgrid and micro-grid distribution network power quality.