裴淑曼,张军.基于自适应虚拟阻抗的微电网控制策略研究[J].电测与仪表,2018,55(12):82-87. Pei Shuman,Zhangjun.Research on control strategy of microgrid based on adaptive virtual impedance[J].Electrical Measurement & Instrumentation,2018,55(12):82-87.
基于自适应虚拟阻抗的微电网控制策略研究
Research on control strategy of microgrid based on adaptive virtual impedance
For parallel multi-inverters in low voltage microgrid, the equivalent output impedance of inverters were usually resistive or resistive-inductive, so using the traditional droop control method resulted in low reactive power distribution accuracy and the circulating current. Thus, the virtual impedance was developed in the traditional dual-loop control of voltage and current, by this way, the equivalent output impedance of inverters can be inductive and it can improve the output reactive power distribution accuracy of inverters and restrain the circulating current. However, the virtual impedance can also lead to large voltage drop, so an adaptive control method was proposed in this paper, in this case, the virtual impedance value was adjusted on-line with the bus voltage amplitude fluctuation, and the reference value of inverters output voltage were compensated, and this strategy could reduce bus voltage deviation and improve the power quality of the microgrid. Finally, the simulation results verified the effectiveness of the proposed control strategy.
