Multi-Source Coordinated Control Strategy Based the Battery SOC for Islanded DC Microgrid

摘要

Islanded DC microgrid is equipped with energy storage unit to balance the power between renew able energy power generation and load. Battery becomes one of the optimum choices for energy storage unit with many advantages. To avoid battery deep charging and discharging and prolong its service life, a multi-source coordinated control strategy for islanded DC microgrid is proposed based on battery's state of charge (SOC). It includes primary decentralized control and secondary centralized control. Primary decentralized control is used to realize autonomous coordinated operation of micro-sources. The droop curve of primary control is adjusted by secondary centralized control, which eliminates the stable voltage deviation produced by primary control when the SOC is close to the upper limit. Finally, experimental hardware-in-the-loop simulation (HILS) system of wind-battery based on islanded DC microgird is constructed and the effectiveness of the multi-source coordinated control strategy is verified by experimental results.