Complementary Operation Optimization of Multi-energy Power Systems Considering Water Sensitivity of Pumped Storage and Deep Regulation of Thermal Power Plants

As penetration of wind power and photovoltaic increasing, security and stability of power grid have been influenced. Renewable energy is usually characterized by anti-peak shaving and fluctuation, which thus may result in power imbalance. In this case, thermal units are usually utilized to provide regulating power. However, deep peak regulation would have a negative effect on thermal power units, which can be alleviated by pumped storage. Given this background, this paper presents an optimal dispatching model for the power system with pumped storage, wind power, photovoltaic and thermal power units involved. Firstly, the operation model of thermal units is proposed to formulate the extra operational cost caused by deep peak regulation. Pumped storage model considering water head sensitivity characteristics is established as well. Then a day-ahead optimal power flow model is proposed including deep-peak-regulation thermal units and head-sensitive pumped storage. Finally, the IEEE-39 test system is conducted to demonstrate the effectiveness and feasibility of the proposed method.