Hybrid Fuzzy Controlled Isolated Micro Grid Based On Battery Storage System Using Renewable Energy Sources

Abstract

The enabling of ac micro grids in distribution networks allows delivering distributed power and providing grid support services during regular operation of the grid, as well as powering isolated islands in case of faults and contingencies, thus increasing the performance and reliability of the electrical system. This paper proposes an alternative strategy to control the generated power within an isolated ac micro grid with distributed RES. The proposal is to control the terminal voltage of the existing battery banks below or equal its maximum allowable value. In this particular study, the power system consists of a power electronic converter supplied by a battery bank, which is used to form the ac grid (grid former converter), an energy source based on a wind turbine with its respective power electronic converter (grid supplier converter), and the power consumers (loads). The main objective of this proposed strategy is to control the state of charge of the battery bank limiting the voltage on its terminals by controlling the power generated by the energy sources. This is done without using dump loads or any physical communication among the power electronic converters or the individual energy source controllers. The electrical frequency of the micro grid is used to inform the power sources and their respective converters about the amount of power that they need to generate in order to maintain the battery-bank charging voltage below or equal its maximum allowable limit.. The Proposed concept is implemented to hybrid fuzzy controlled logic using mat lab/simulation link software.