An Improved Control Strategy of Load Distribution in an Autonomous Microgrid

This paper proposed an improved control strategy of load distribution in an autonomous microgrid with multiple distributed generation units.Load sharing in an autonomous microgrid based improved V/δ droop control,instead of commonly used V/f droop control method,was investigated in this paper.The P-δ droop function and Q-V droop function employs additional derivative terms with modified gain respectively,which guarantee stability and good transient response.A supplementary loop was proposed around the primary droop control loop of each distribution generator(DG) converter which can modulate the d-axis voltage reference of each converter as to stabilize the system despite having high gains that are required for better load sharing.The simulation results verify that the proposed control strategy is effective for load distribution in the autonomous microgrid.