Cost-Optimized Battery Capacity and Short-Term Power Dispatch Control for Wind Farm

Utilizing the optimal capacity of a battery in wind-battery hybrid power systems is crucial to minimize costs. In this paper, we modify the min-max dispatch method to effectively integrate wind power into the grid. In line with the dispatch principle, we define a lifetime cost function, which indicates the battery energy storage system cost of dispatching 1 kWh of wind energy, to determine the optimal battery capacity. By using the optimal battery capacity, the operation costs are minimized, and the hybrid system is able to dispatch the scheduled power at any dispatching time. Moreover, the short-term power dispatch control is also considered; we smooth the transient power between two consecutive dispatching intervals and control the state of charge of the battery by an online control algorithm. To evaluate the performance of the proposed optimization method and the short-term power dispatch control, we perform several numerical studies with a 3-MW wind turbine generator and real wind speed data.