An Improved Droop Control Strategy Based on Adaptive Virtual Impedance Control

In isolated microgrids, due to factors such as differences in line impedance, the application of traditional droop control can lead to an unreasonable distribution of reactive power according to the droop coefficient. This paper proposes an improved droop control strategy. The central controller calculates the given power based on the total load capacity and the capacity of each inverter, and then sends it to each inverter for local control. The inverter adjusts the virtual impedance value according to the given reactive power to compensate for the voltage drop difference caused by the line impedance difference, thereby achieving an even distribution of reactive power. Using Matlab/Simulink as the simulation platform, a simulation model of an isolated microgrid is established. The simulation results verify the effectiveness of the proposed control strategy, which can provide a reference for the actual operation control of microgrids.