Fuzzy Control Stand-Alone Micro Grid System with Battery Energy Storage System

M. Vennela, B. Gopal

Abstract


Battery Energy Storage System (BESS) is used for primary frequency regulation. As developments in batteries progress, advancement in applications of BESS including the implementation in high power penetration is expected. Load shedding is one of frequency control methods during stand-alone operation, and the performance of frequency control improves in combination with BESS. However, without optimal size of BESS, it can cause the oscillations to the system. Thus, this article proposes the feasibility of using optimal BESS with load shedding scheme when the micro grid is disconnected from a main source. In the developing of smart grid, many new technologies and components such as energy storage and micro grid are playing more and more role for making the power system more reliable and efficient. A grid-connected micro grid consists of local controllers, local consumers, renewable energy generators and storage facilities will become an important part of future smart grid. The State of Charge (SOC) of battery bank is in an insufficient state, BESS is not possible to act as a continuous supplier. To charge SOC of the battery bank, the control methods of two charging modes are proposed and stability of control. BESS requires the stable and robust control methods whether performs either Constant Voltage Constant Frequency (CVCF) or grid-connected mode. In the controller point of view, Fuzzy control is widely used to supply stable voltage and current.


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