Peak-shaving and valley-filling strategies with UHV introduction based on an improved peaking model

Peak-shaving and valley-filling are important respects while making a scheduling plan, especially faced with the situation when Ultra-High Voltage (UHV) is introduced into the grid. With the target for calculating the cost and effectiveness of different peaking strategies continuously rather than only at the optimal point, this paper proposes an improved peaking model. The values of the objectives reflect the effectiveness of the strategies, and with the controllable variables of the model we can define different peaking costs. Based on the model, we develop several peaking strategies, including optimized hydropower scheduling, water abandoning, regulation of UHV power and load increasing. Using the realistic data, we analyze the effectiveness of the strategies and showed the practicality of the proposed model.