Energy storage control in renewable energy based microgrid

Microgrid (MG) is considered to be an advanced configuration of distributed generation through the effective organization of renewable energy power sources, loads and energy storage devices. Energy storage (ES) is essential to the stable and efficient operation of renewable energy based MG. This paper describes ES applications in a renewable energy based MG, including system black start support, stable control support, power quality improvement and distributed renewable energy (DRE) capacity credibility enhancement. Then a three-loop control strategy that can be applied for both islanded mode and grid-tied mode is presented. The experimental results show that the control strategy can make the modes transition smoothly. A MG demonstration was conducted to verify the feasibility of ES and its control method in the renewable energy based MG.