跨断面梯级水风光中长期优化调度规则研究

Study on medium and long-term optimal dispatching rules for cascade hydro-wind-photovoltaic system crossing sections

摘要

充分发挥水电的灵活调节和大电网资源优化配置能力，优化以可再生能源为主体的新型电力系统互补调度方式，降低电网调度决策困难，以促进风光电量消纳并保障电网安全稳定运行亟待深入研究。为解决新型电力系统下跨输电断面联合优化调度的问题，为梯级水库调度提供决策依据，构建了以梯级水电站发电量最大和枯期断面内水风光互补系统出力波动最小为目标的中长期优化调度模型，并采用PSO-POA算法对雅砻江清洁能源基地70 a长系列运行数据进行求解计算。根据优化计算结果，采用门限回归方法提取了骨干水库中长期逐月调度函数。结果表明：所构建的两河口、锦屏一级和二滩的月调度函数可决系数(R²)均值分别为0.869、0.868和0.874,整体上有较好的拟合效果，可为水库调度提供运行决策支持。

Abstract

The topic of giving full play to the flexible regulation of hydropower and the optimal allocation of power grid resources, optimising the complementary scheduling mode of the new power system with renewable energy as the main body, and reducing the difficulty of grid scheduling decision-making, so as to promote the consumption of wind and wind power and ensure the safe and stable operation of the grid urgently needs in-depth research. This paper was written to address the problem of joint optimal scheduling across transmission cross sections under a new type of power system to provide a decision-making basis for the scheduling of gradient reservoirs. In this paper, a medium-and long-term optimal scheduling model is constructed with the objective of maximising the generation capacity of the terraced hydropower station and minimising the fluctuation of the cascade hydro-wind-photovoltaic complementary system output in the dry period section based on the annual scheduling task of backbone reservoirs and the smoothness of system output. Taking the 70-year long series operation data of Yalong River clean energy base as information, PSO-POA algorithm is used to solve the model. According to the result of optimisation calculation, the medium-and long-term scheduling function of backbone reservoirs is extracted by threshold regression method. The result show that the mean values of the coefficient of determination(R²) of the constructed monthly dispatch functions for the Lianghekou station, Jinping Ⅰ station and Ertan station are 0.869, 0.868 and 0.874, respectively, which have a better fitting effect on the whole, and can provide operational decision-making support for reservoir dispatching.

关键词

水风光互补系统 / 优化调度模型 / 调度函数 / 门限回归

Key words

hydro-wind-photovoltaic complementary system / optimised dispatching model / dispatching function / threshold regression

Author summay

周开喜(1982—), 男, 高级工程师, 学士, 研究方向为水电及新能源调度管理。E-mail: [e-mail]

基金资助

国家电网有限公司西南分部科技项目资助(SGSW0000DKJS2310037)