Frequency regulation for a power system with wind power and battery energy storage

With the increase of wind power penetration to a notable level in power systems, the requirement on frequency regulation services has increased accordingly in recent decades. Due to the limited ramp rate and economic factors of conventional generators, simply increase the capacity of conventional generators may not be an effective solution for providing frequency regulation services quickly. Large-scale battery energy storage system has been applied as a promising solution for frequency control in some renewable energy integration projects. In this paper, a control method is proposed for battery energy storage system to provide frequency regulation service. The control strategy to the energy storage system is indicated in the classical two-area AGC control diagram. The effects of the proposed battery control strategy for power system frequency control have been simulated and tested. The simulation results show that battery systems could be used as a tool in quick frequency control. The results also show the possibility of introducing battery energy storage system into real wind power generation projects.