考虑水光互补系统参与电力辅助服务的短期优化调度

Short-term Optimal Dispatch of Electric Auxiliary Services Considering Hydrophotovoltaic Complementary System Participation

梯级水电站与光伏进行互补对平抑光伏波动、提高光伏消纳具有重要意义。为此,首先从发电功率波动最小和发电经济效益最大2个目标函数出发,考虑水光互补系统参与电网有功平衡辅助服务,通过整定水光互补系统出力设计值,使其日内出力趋势能在一定范围内跟随电网负荷的波动,建立梯级水光互补系统短期多目标优化调度模型。其次计及梯级水电站水量约束和光伏电站的晴、阴、雨3种典型日发电特性,采用基于分解的多目标进化算法进行求解。最后对3种典型场景下的梯级水光互补系统的日内优化调度进行验证和分析。实验结果表明梯级水光互补系统可有效平抑光伏发电的间歇性、波动性,并且互补系统出力能及时在电网负荷高峰时段做出相应调整;梯级水光互补系统优化调度方案兼顾了功率波动性和发电经济效益。

Complementation among cascade hydropower stations and photovoltaic is of great significance for stabilizing photovoltaic fluctuations and improving photovoltaic consumption.For this reason,firstly,starting form the two objective functions,i.e.,minimum fluctuation of generated power and maximum economic benefit of power generation,considering the participation of hydro-photovoltaic complementary system into power grid active power balance auxiliary service,by means of setting the design value of hydro-photovoltaic complementary system to make its intraday output trend enable to fallow the fluctuation of power network load in a short-term multi-objective certain range, a multi-objective optimal dis-patching model of short-term cascade hydro-photovoltaic (abbr. PV) complementary system was established. Secondly, taking the water volume constraint of cascade hydropower stations and typical daily power generation characteristics of three typical intraday sunny, cloudy and rainy photovoltaic power stations into account, a multi-objective evolutionary algorithm based on decomposition was used to solve the problem. Finally, the in-traday optimal scheduling of the cascaded hydro-photovoltaic complementary system under three typical scenarios is verified and analyzed. The results show that the cascaded hydro-photo-voltaic complementary system can effectively suppress the in-termittency and volatility of photovoltaic power generation, and the output of the complementary system can be adjusted in time during the peak load period of the grid. The optimal scheduling scheme of the complementary system takes into account both power fluctuation and economic benefits of power generation.