Day-head Peak-shaving Model for Coordinated Wind-photovoltaic-pumped-storage-hydropower Generation Systems

The fluctuating and anti-peak-shaving characteristics of renewable energy (RE) challenges secure and reliable operation of power systems. Pumped storage hydropower with variable speed pumps (VS-PSH) can regulate power in both generating and pumping modes, which provides flexibility for accommodating intermittent RE generation. In this context, the optimal operation strategies of VS-PSH plants is developed considering RE accommodation priority. Firstly, the scheme of the coordinated wind-photovoltaic-pumped-hydropower-storage (WPPHS) generation is presented. Then, an optimal day-ahead peak-shaving model is proposed based on the principle of using PSH plants to compensate for fluctuating wind and photovoltaic power. A head-dependency model is proposed to describe the effect of water head on generation/consumption characteristics of VS turbine-pump Units. Finally, a case study is conducted to demonstrate the effectiveness and feasibility of the proposed method.