风光水互补系统发电效益-稳定性多目标优化调度

Benefit-stability multi-objective optimal operation of wind-solar-hydropower hybrid system

风光水互补系统联合运行是解决风电、光电等间歇性能源消纳的有效方法之一,但互补系统的发电效益与稳定性存在矛盾关系,如何分析系统的出力互补特性并解析效益-稳定性关系是本研究解决的关键科学问题。本研究在雅砻江流域风光水互补示范基地上开展研究工作,采用互补系统总发电量最大、出力过程变异系数最小为目标构建效益-稳定性多目标优化调度模型,采用径流、风速和太阳辐射强度等作为输入,分析调度方案出力互补特性与目标关系。研究结果表明:效益-稳定性目标之间的关系为总发电量越大,变异系数越大,出力过程平稳性越差;互补系统在日内时间尺度上的互补关系为从夜间到日间再到夜间,光电出力从零逐渐增大再变为零,风电出力从大变小再变大,存在日内互补关系,水电能源依靠调节能力可有效互补平抑风电和光电出力。

The joint operation of the wind-solar-hydropower hybrid system is one of the effective methods to solve the intermittent energy consumption such as wind power and photovoltaics.However, the power generation benefit and stability of the complementary system are contradictory.How to analyze the output complementarity characteristics of the system and analyze the benefit-stability relationship is the key scientific problem to be solved in this study.The wind-solar-hydropower(WSH) complementary demonstration base in the Yalong River Basin is taken as the research object.The benefit-stability multi-objective optimal operation model is constructed by taking the maximum total power generation of the complementary system and the minimum variation coefficient of the output process as the goal.Then, using runoff, wind speed and solar radiation intensity as inputs, the complementary characteristics of system output and the difference of scheduling scheme are analyzed.The research results show that the relationship between benefit and stability objective is that the greater the total power generation, the greater the coefficient of variation, and the worse the stability of the output process.The complementary relationship of WSH hybrid system on the intraday time scale is that from night to day to night, the photovoltaic output gradually increases from zero and then becomes zero, and the wind power output increases from large to small and then large.There is an intraday complementary relationship, and hydropower energy can effectively complement and stabilize wind power and photovoltaic output depending on the adjustment capacity.