Article
HYBRID ENERGY MANAGEMENT AND CONTROL STRATEGY OF PHOTOVOLTAIC GENERATION SYSTEMS
Energy storage is the capture of energy produced for use at a time to time. Hybrid storage devices are used in microgrids to provide power backup solutions when the distributed energy resources (DERs) are unable to supply the load demands. This work deals with the design and stability analysis of a DC microgrid with battery-supercapacitor energy storage system under variable supercapacitor operating voltage. The conventional design method reported in the literature considers the rated supercapacitor voltage in the modeling and design of controllers. However, the supercapacitor unit can discharge as low as 10% of its rated voltage due to self-discharge. It is observed that the conventional method of controller design can potentially make the system unstable. This paper proposed an optimal super capacitor voltage to be considered in the design is calculated and a design method is proposed to ensure the stability of DC microgrid in all operating modes.
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