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This paper describes a design concept in which a digital controlled power interface embedded with a battery energy storage system (BESS) named battery interfaced static synchronous generator (BISSG) is constructed to improve the power quality of micro-grid (MG) systems. Some distributed generation (DG) systems, e.g., the wind turbine generator (WTG) and the Photovoltaic (PV) systems conventionally generate real power based on natural conditions thus their output power are fluctuating from time to time. To eliminate this shortcoming, the proposed BISSG attempts to smooth the output power of DG with fast charging and discharging its BESS. To achieve a cost-effective design, the proposed BISSG is designed to maximize its control capability in terms of bilateral real power regulation and reactive power compensation for MG voltage support or power factor correction. It is important to note that the proposed BISSG is able to fulfill various real power dispatching functionalities required by the system operator. In this paper, the mathematical model of BISSG and its related controllers are firstly addressed. Then, simulation studies and hardware tests on a simplified MG network are carried out. Typical results are presented with brief discussions to demonstrate the feasibility and effectiveness of the proposed control scheme.

Power Flow Control of Renewable Energy Based Distributed Generators Using Advanced Power Converter Technologies