考虑季节性电价的梯级水电站联合优化调度研究

Research on Joint Optimal Operation of Cascade Hydroelectric Plants Considering Seasonal Electricity Prices

考虑梯级水电站上网电价季节性差异与未来电价变动的可能,以发电效益最大化为目标,构建了梯级水电站联合优化调度模型,采用动态规划-逐步优化算法(DP-POA)进行求解,研究了平均电价,非汛期电价上浮和汛期电价上浮等3种电价情景下梯级发电效益,并提炼了联合优化调度策略。以金沙江中游梨园、阿海、金安桥、龙开口、鲁地拉和观音岩等6座梯级水电站为研究对象,研究结果表明:①金沙江中游梯级水电站非汛期上网电价明显高于汛期,但相较非汛期,汛期发电量更大,发电效益更高;②联合优化调度可增加金沙江中游梯级水电站多年平均发电量和发电效益,不同电价情景下,最多可分别增加7.33亿kWh和2.01亿元;③相较常规调度过程,联合优化调度下金沙江中游梯级的水位主要在5月和6月提前消落,8-9月延后蓄满。研究成果可为金沙江中游梯级水电站联合优化发电调度提供参考依据和技术支撑。

Considering the seasonal variations of hydroelectric prices and probabilities of electricity price fluctuations in the future,this study established a joint optimal operation model of cascade hydroelectric plants for maximizing hydropower generation benefits,which was solved by the Dynamic Programming-Progressive Optimality Algorithm(DP-POA).The study investigated hydropower generation benefits under three electricity price scenarios,including the average electricity price and electricity price increase during the non-flood and flood seasons,and extracted joint operation strategies of cascade hydroelectric plants.The six cascade hydroelectric plants in the middle reaches of the Jinsha River,including Liyuan,Ahai,Jinanqiao,Longkaikou,Ludila and Guanyinyan in the middle reaches of the Jinsha River were selected as the research objects.The results showed that:①The on-grid electricity prices of the cascade hydropower stations in the middle reaches of the Jinsha River during the non-flood season were significantly higher than those during the flood season,but the power generation volume and benefits of the flood season were greater than those of the non-flood season;②Joint optimal operation could increase hydropower generation and hydroelectric benefits.Under different electricity price scenarios,the maximum increase can be 7.33×10^(8) kWh and 2.01×10^(8) yuan,respectively;③Compared to the conventional operation processes,the water levels of cascade hydroelectric plants mainly declined in advance in May and June and were delayed to be fully impounded in August and September.The research results can provide references and technical supports for joint optimal operation of cascade hydroelectric plants in the middle reaches of the Jinsha River.