Dynamic Average Consensus-Based Reactive Power Sharing and Voltage Regulation Method in the Microgrid

As a burgeoning approach, droop control of interfacing inverters in microgrids has been widely adopted. However, droop control cannot achieve proportional reactive power sharing among distributed generators because of the difference of feeder impedances in actual microgrids. Hence, a novel distributed adaptive virtual impedance method based on average consensus algorithm is proposed to relieve feeder impedance mismatch. There into, virtual impedance is composed of static and adaptive inductance, which is designed to reshape equivalent impedance by creating additional control loops. Adaptive inductance unit is designed based on reactive power mismatch by applying multiagent consensus algorithm. By fully distributed adjustment to equivalent impedance, reactive power sharing accuracy can be improved. Then, proposed control method is applied to modified droop control, which is embedded designed dynamic voltage average consensus estimator, providing superior voltage restoration. At last, the effectiveness of proposed control method is shown by using simulation and further demonstrated through experiment study.