Research on Maintenance Boundary Variation of Cascade Hydropower Units Based on Dynamic Programming-Progressive Optimization Algorithm

¹ Yalong River Hydropower Development Company LTD, Production Management Department, Chenghua, Chengdu, China
² Yalong River Hydropower Development Company LTD, Centralized Control Centre, Chenghua, Chengdu, China
³ Sichuan University, College of Electrical Engineering, Wuhou, Chengdu, China

^* zhangliang@sdic.com.cn
^** wangwensong@sdic.com.cn
^*** heyong@sdic.com.cn
^**** chenping21@sdic.com.cn
^***** Corresponding author: xingyan0912@163.com
^****** lushuai@sdic.com.cn

Abstract

Hydropower, as a primary source of renewable energy, plays a crucial role in achieving the dualcarbon goal. Therefore, it is essential to optimize the maintenance schedule to ensure the smooth operation of hydropower units and explore the principles governing the boundaries of the maintenance window period, considering multiple realistic constraints. In this paper, we take the “3-reservoirs and 7-levels” hydropower station in the lower Yalong River Basin as a case study. We establish an optimal model with the objective of maximizing the generating output, considering the total generating capacity and output of each hydropower station under various constraints. Next, we calculate the number of repairable units based on the ten-day output for each scenario and compare the maintenance window period while analysing its changing pattern. Finally, a comprehensive maintenance plan was developed based on historical maintenance data and industry standards with considering the changing rules. Additionally, we provide suggestions based on these rules.