A fast reactive power sharing strategy for islanded microgrid based on feeder current sensing

To solve the reactive power sharing issue in droop control, many improved methods have been developed. However, existing methods can´t provide both accurate and fast performance in reactive power sharing, no matter wireless or communication methods. In fact, rapidity is an important indicator for reactive power sharing control, especially when load changes frequently. In this paper, a fast reactive power sharing strategy that employs feeder current sensing and feeder voltage drop compensation is proposed for islanded microgrid. The proposed strategy introduces feeder current sensing based on the conventional droop control method. With the instant information of feeder current, the mismatched feeder voltage drops that cause reactive power sharing errors in microgrid are calculated and compensated in real time. The proposed strategy can not only reach the same accuracy as communication based solutions, but also provide faster response to load change. Moreover, it is more convenient to be applied due to its wireless manner. Matlab simulation and experimental results are used to validate the feasibility of this strategy.