Power dispatch capability of wind-battery hybrid power system

This paper focuses on determining the power dispatch capability of wind-battery hybrid power system (WBHPS). To cooperate with the transmission system operator (TSO) in the modern electric power market, the power dispatch capability of the WBHPS must be defined primarily at beginning of each dispatching time interval. Based on the wind power available and the battery capacity status, the power dispatch capability which means the power level of the WBHPS can dispatch to grid is determined. The proposed determination method aims to satisfy two crucial constraints while the wind power is being integrated into grid. The first constraint associated with the battery capacity is to guarantee the battery power lower than its rating. And, the second one is to keep the state of charge (SOC) of the battery within a safe range. In order to determine the maximum and minimum range of the power dispatch, the availability level of the wind power in each dispatching time interval is estimated based on the wind speed forecast. To evaluate the proposed determination method, we perform a numerical study using a 3-MW wind turbine generator with a real wind speed data measured on Jeju Island.