New Power Management Strategies for a Microgrid with Energy Storage Systems

The combination of cascade control and local control is proposed as a method to compensate power fluctuations caused by load and renewable energy sources in a microgrid with distributed power generation systems- (DGs).The use of energy storage system(ESS) such as EDLC facilitates power ompensation. However, since the energy capacities of these components are limited, the contol of their state of charge(SoC) is necessary. This paper addresses real and reactive power management strategies of electronically interfaced distributed generation(DG)units in the context of a multiple-DG microgrid system,and a new method to control ESS's SoC which would enable power compensation with less energy capacity and with less effect to the compensation result is proposed.