A New Strategy for Smoothing Wind Power Fluctuation Based on Battery Energy Storage System

In order to improve the usage efficiency and increase service life of the storage battery, a topology of treble battery energy storage systems (BESSs) is proposed to smooth fluctuation of wind power from the aspect of battery controlling based on the technical characteristics of batteries. Besides, a controlling strategy is also designed to guarantee that different battery energy storage systems have different tasks among these treble battery energy storage systems, in which two BESSs are running in charging and discharging states respectively, while the other is in the standby state. Thus to dispatch alternatively, the positive and negative fluctuating components of wind power are applied. The usage efficiency and the cycle life of the battery can be improved successfully if the treble battery energy storage systems (BESSs) work in the cyclical patterns of charge storage discharge storage charge. The simulation results of a certain wind farm show that the usage efficiency of the storage battery can be improved to almost 100% with the topology of treble BESSs based on the function of smoothing the fluctuation of wind power.