Battery Energy Storage to Strengthen the Wind Generator in Integrated Power System

Abstract

The wind energy generation, utilization and its grid penetration in electrical grid are increasing world-wide. The wind generated power is always fluctuating due to its time varying nature and causing stability problem. This weak interconnection of wind generating source in the electrical network affects the power quality and reliability. The localized energy storages shall compensate the fluctuating power and support to strengthen the wind generator in the power system. In this paper, it is proposed to control the voltage source inverter (VSI) in current control mode with energy storage, that is, batteries across the dc bus. The generated wind power can be extracted under varying wind speed and stored in the batteries. This energy storage maintains the stiff voltage across the dc bus of the voltage source inverter. The proposed scheme enhances the stability and reliability of the power system and maintains unity power factor. It can also be operated in stand-alone mode in the power system. The power exchange across the wind generation and the load under dynamic situation is feasible while maintaining the power quality norms at the common point of coupling. It strengthens the weak grid in the power system. This control strategy is evaluated on the test system under dynamic condition by using simulation. The results are verified by comparing the performance of controllers.