Regulation Model of Suppressing Wind Power Fluctuation Based on Small Hydropower Virtual Power Plant

Abstract

Using energy storage power station to suppress wind power fluctuation has large investment and low economic effect. According to the condition that Ningde grid has adjustable small hydropower, two construction schemes of virtual power plant based on adjustable small hydropower is proposed to suppress the power fluctuation of the coastal wind power in Ningde. The objective function of the coordination and optimization regulation model is to minimize the generation cost of the small hydropower units. Based on the cascade hydropower model, the water constraints of the reservoir and output constraints of the hydropower, as well as the constraints of stable operation of power system are considered. A double-layer algorithm based on the branch and bound and the checking and adding method of power flow constraint is used to solve the optimal model. The algorithm proves the validity of the optimal scheduling model and proposes the optimal strategies of the small hydropower. The simulation results show that the virtual power plant using small hydropower to suppress wind power fluctuation can effectively realize friendly access of Ningde wind farm, reduce the operation cost of power grid and achieve low carbon and clean electric power without additional construction investment.