Optimal Capacity Configuration of Hybrid Energy Storage System for Photovoltaic Plant

Compared with a single type of energy storage system, hybrid energy storage system(HESS) has more advantages and application prospects in terms of smoothing the power of photovoltaic(PV) plant. In view of this, this paper proposed an optimal capacity configuration method for a hybrid energy storage system consisting of battery, flywheel and super-capacitor based on the characteristics of the three types of energy storage devices. It takes minimizing the annual average cost, energy storage power deviation and load peak-valley difference as goals, and considers the constraints of balance between supply and demand, state of charge(SOC) and charging and discharging power. Finally, conFigure the capacity of HESS based on the simulation example, and derive the best optimal capacity allocation ratio. It can be seen from the results that the proposed method can deeply reduce the economic costs, and make superiority better.