On Control of Energy Storage Systems in Microgrids

In high renewable penetrated microgrids, energy storage systems (ESSs) play key roles for various functionalities. In this chapter, the control and application of energy storage systems in the microgrids system are reviewed and introduced. First, the categories of energy storage systems utilized in microgrids and the power electronic interface between energy storage systems and microgrid systems are introduced. Then a comprehensive review of control methods of ESSs in islanded microgrids is reviewed. The functionalities include SoC balancing among multiple ESSs, coordination among renewable energy resources and ESSs, etc. In grid-connected microgrids, the utilization of ESSs for grid ancillary services, especially frequency and voltage regulation are introduced. The future research trend and opportunities are also discussed.