分布式多变流器型微电网无互联线潮流控制

When total apparent power of the energy storage system (ESS) interfacing converter is fixed, the higher the requirement on reactive power in the microgrid system with distributed multiple converters, the weaker the ability of ESS to balance theactive power between distributed generators and loads is. To reduce this limitation on ESS, a wireless power flow control method, which autonomously utilizes all potential distributed reactive compensation sources to supply reactive power needed by loads to mitigate the pressure of reactive power adjustment, is proposed. Droop control and reversed droop control are integrated to implement rational power allocation among voltage controlled mode and current controlled mode converters. Meanwhile, the factors impacting the accuracy of reactive power allocation are analyzed, and a method based on the combination of virtual impedance with adaptive no-load voltage compensation is proposed to improve the accuracy of reactive power allocation. Finally, real time hardware-in-the-loop results are presented to show the feasibility of proposed control strategy.