A Coordinated Optimization Scheduling of Wind-hydro-thermal Power System Based on Requirement of Peak Load and Frequency Regulation

Abstract

In order to reduce the impact of wind power integration on system peak load and frequency regulation, and promote complementary optimization of multiple energy sources, based on the requirement of peak load and frequency regulation due to uncertainty of wind power and load, this paper established a coordinated optimization scheduling model of wind-hydro-thermal power system including cascade hydropower stations. In order to set the reserve for peak load and frequency regulation more reasonably and accurately, the reserve in the model was divided into 7 kinds according to time scale, and the demands of above 7 kinds of reserve were quantified using discrete Fourier transform method and Parseval's theorem. Besides, in order to achieve coordination of various types of resources for wind-hydro-thermal power on different time scales, with minimizing the totalcost of power generation, peak load and frequency regulation as objective function, and taking into account various operational constraints of systems, wind power, cascade hydropower and thermal power, a coordinated multi-source optimization scheduling model was designed and solved with mixed integer linear programming. Finally, case studies verified validity of the proposed method and model.