张继红,杨建民.孤岛微网并联逆变器环流抑制与母线电压控制[J].电测与仪表,2021,58(2):125-132. Zhang Jihong,Yang Jianmin.Circulating current restraining and bus voltage control of parallel inverters in islanding microgrid[J].Electrical Measurement & Instrumentation,2021,58(2):125-132.
孤岛微网并联逆变器环流抑制与母线电压控制
Circulating current restraining and bus voltage control of parallel inverters in islanding microgrid
Aiming at the problems of large circulating current and bus voltage and frequency deviation in islanding microgrid parallel micro-source inverters system with traditional droop control, the quantitative relation between circulating current and load power sharing was analyzed according to the general definition of circulating current, on this basis, the problem of circulating current restraining was transformed into the problem of accurate power sharing, and an improved robust droop control method with bus voltage and frequency self-recovery function was proposed. The PI controller was introduced into the reactive power-voltage control loop to realize the accurate reactive power sharing and accelerate its dynamic sharing process, which can restrain the steady-state circulating current and improve the dynamic current sharing performance. The bus voltage and frequency closed-loop control was adopted to track its rated value and enhance bus voltage quality. In view of the new problem of power sharing disproportion after other inverters paralleling, the corresponding solution was proposed. The PSCAD/EMTDC cases simulation results show the correctness and validity of the proposed scheme.
