Dynamic Compensation Strategy of Microgrid PCC Voltage Based on Residual Generator

This paper analyzes the disturbance current under the sudden increase of the common load power, and proposes a voltage feedforward compensation controller that can be used for parallel connection of multiple inverters under droop control, which is proportional to the disturbance current of the load end. The disturbance is given as a disturbance input to each compensator, and the common load terminal transient voltage is compensated. The controller can better compensate for voltage fluctuations during load shedding and three-phase imbalance problems. In order to meet the demand of plug and play, a voltage phase angle pre-synchronization method is proposed to eliminate the circulating current. The compensation effect is verified by comparing the simulation with the traditional control strategy.