Ultra-Capacitor and Battery Hybrid Energy Storage System in Micro-grid to Improvement of Transient Stability

The necessity to solve global warming problems by reducing CO2 emission in electricity generation field had led to increasing interest in micro grids (MGs), particularly those containing the renewable such as solar and wind generation. This paper endeavors an investigation of transient stability improvement of micro grid based on BESS (battery energy storage system) and ultra-capacitor energy storage controller used in micro grid for analyzing the optimum capability of plant under transient conditions. After that, we compare the system results by one-phase and three-phase faults to demonstrate the effectiveness of using the hybrid energy storage system in transient stability response. Micro grid is formed by using wind turbine power plants, micro turbine and hotovoltaic system feeding linear and nonlinear loads. The BESS and ultra-capacitor and the controller of them permits the selection of an optimized battery voltage level and allows independent current control of each phase. Results of this investigation show that the hybrid storage systems are very good to support the network in fault condition and other disturbances. Finally simulation results have proved that the hybrid energy storage system designed and the control method proposed are applicable and effective for the Micro-grid transient stability improvement. The main emphasis in this paper is given on maintaining constant voltage and frequency within the micro grid under transient conditions based on battery and ultra-capacitor energy storage system. Micro grid with wind power plant, micro turbine and photovoltaic with BESS and ultra capacitor controller is modeled in MATLAB/SIMULINK software.

کلیدواژه ها:

microgrid ، battery energy storage system ، ultra-capacitor ، transient stability improvement ، hybrid energy storage system