考虑水光协调性与经济性的水电站优化调度

为降低光伏出力波动性、提高水光互补综合系统的电量效益，本文以西藏装机容量最大的藏木水电站与其拟规划的光伏电站为例，选择晴天、阴天和雨天三种典型日，以系统总出力波动平均值表征水光互补综合系统协调性，以水光综合出力电量效益、水电旋转备用补偿效益之和表征系统经济性，建立考虑水光协调性与经济性的水电站机组尺度优化调度模型，在枯水期典型日下，揭示系统协调性与经济性转换关系，分析水电、光伏发电日内运行规律。结果表明：水光互补综合系统协调性与经济性呈现明显的竞争关系，晴天、阴天和雨天三种典型日系统总出力波动平均值由3.5 MW降低至2.5 MW，相应经济效益分别减少0.62%、0.38%、0.22%。研究结果对提升水光互补系统协调性与经济性具有实际指导意义。

Optimal operation of hydropower stations considering hydro-photovoltaic coordination and economy

This paper develops an optimal operation model of hydropower unit operation for hydropower stations considering hydro-photovoltaic coordination and economy to reduce the fluctuation of photovoltaic outputs and improve the power generation efficiency of a hydro-photovoltaic complementary integrated system (HPCIS). We examine a study case of the Zangmu hydropower station, with the largest installed capacity in Tibet, and its planned photovoltaic power station, focusing on three typical days－sunny, cloudy and rainy days. For a HPCIS, this model uses the average fluctuation value of the total system output to describe its coordination, and represents its economy by the sum of the electricity benefit of comprehensive hydro-photovoltaic output and the compensation benefit of hydropower rotating reserve. For the typical days in dry season, a transformation relationship between system coordination and economy is revealed, and the daily operation behavior of hydropower and photovoltaic power generation is examined. The results show that for a HPCIS, an obvious competitive relationship exists between its coordination and economy. The average fluctuation of its total system output on the sunny, cloudy and rainy days is reduced from 3.5 MW to 2.5 MW, and the corresponding economic benefits are only reduced by 0.62%, 0.38% and 0.22%, respectively, improving its coordination and economy.