Energy Storage to Stabilize the Weak Wind Generating Grid

The wind energy generation, utilization and its grid penetration in electrical grid is 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 affect the power quality and reliability. The localized energy storages shall compensate the fluctuating power and support to stabilize the weak grid. 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 DC bus voltage control is obtained by using bi-directional DC/DC converter. 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 propose scheme enhances the stability and reliability of 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. This control strategy is evaluated on the test system under dynamic condition by using simulation.