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Renewable energy sources have environmental and economic advantages, but it causes many fluctuations and severe problems on the power system. One solution to decrease these problems are designing renewable sources as distributed generations (DGs) on the power distribution system. But it is necessary to add energy storage systems (ESS) to the power system to improve the impact of DGs on the power system stability. In this paper, the photovoltaic system (PV) with energy storage devices such as battery or superconducting magnetic energy storage systems (SMES) is added to the power system and analyzed the stability of the system by using the software program, “MATLAB/Simulink®”. The transient stability of the power system is studied based on many factors as maximum rotor speed deviation, the drop-in grid voltage, and the drop in DC voltage of the PV. A different abnormal system states are simulated to show the effect of system configuration on its stability. For validation, a comparative study is implemented. From the results, it is found that the stability of the power system is improved through the adding of the PV system and increased by adding energy storage systems.

Impact of Energy Storage Devices on the Distribution System Stability with Distributed Generation. (Dept. E.)