Modeling and Optimization Scheduling Method for Hydropower Units Based on Three-Stage Output Curve Model with Reservoir Constraints

Hydropower is a high-quality, clean energy source with low operating costs and the ability to facilitate peak regulation. To achieve the national strategic goal of clean energy transition, it is of great practical significance to conduct supply-demand balance analysis in hydropower-rich regions. This paper proposes a new method for hydropower output modeling and optimization scheduling in production simulation calculations. First, the traditional three-stage output curve model is used to solve the output arrangement of hydropower units. On this basis, daily scheduled power generation of hydropower unit is taken as the optimization variables, and optimization is performed considering the reservoir capacity constraints. The output of hydropower units is then rearranged using the three-stage output curve model according to the results of daily power generation. The effectiveness of the proposed method lies in its ability to consider reservoir capacity constraints, ensuring the correctness of the calculation results while maintaining the output scheduling principles of the original three-stage output curve model, thus achieving similar peak regulation effect as the original model. Case studies demonstrate the feasibility and effectiveness of the proposed method.