An adaptive compensation droop control strategy for reactive power sharing in islanded microgrid

In a parallel distributed generation system, the conventional droop control strategy makes it difficult for the inverter to output reactive power precisely due to the line impedance uncertainty and load fluctuation, which leads to a voltage deviation of the microgrid system. In order to precisely distribute reactive power, this paper advances an adaptive compensation strategy based on fuzzy control. The fuzzy controller detects the load power of AC bus terminal and output adaptive power coefficient to adjust amplitude voltage to generate compensation voltage. The compensation voltage is fed back to the d-axis voltage of the power loop for reactive power redistribution. Because the fuzzy control membership function value is difficult to determine accurately, this paper puts forward a method which combines neural network with fuzzy control to determine membership function values and fuzzy rules. Simulations and experimental results show that the adaptive compensation control strategy can share power accurately with good dynamic characteristics and robustness.