计及小水电收益的微电网优化配置策略

Optimal allocation strategy of microgrid considering the benefit of small hydropower

微电网容量的优化配置通常是在满足负荷要求的条件下控制微电网的综合运行成本最小,但只按负荷需求进行容量配置会造成资源得不到充分利用,微电网收益得不到保障。针对提高新能源丰富地区的微电网收益问题,提出了计及小水电收益的微电网容量优化配置策略,在保证微电网系统能满足独立运行的条件下,考虑可调节式小水电的调节能力和能源互补效应,以系统收益最大为优化目标,微源最大装机容量、小水电蓄水库水量要求以及蓄电池充放电功率限制等为约束条件,建立微电网的容量优化配置模型,通过仿真算例验证了优化策略可以减少蓄电池的配置容量,提高微电网的经济收益;提出互补度评价指标,通过不同算例的互补度对比,可以证明风、光、水能的互补性有利于减少系统的储能配置容量。

The optimal allocation of micro-grid capacity is usually to minimize the comprehensive operation cost of micro-grid under the condition of satisfying load requirements.However,the capacity allocation only based on load demand will result in the insufficient utilization of resources and the unguaranteed income of micro-grid.To improve the benefits of micro-grid in areas with rich new energy,this paper puts forward a micro-grid capacity optimization allocation strategy taking into account the benefits of small hydropower,under the condition that the micro・grid system can satisfy the independently operating conditions and considering the regulation of adjustable small hydropower capacity and energy complementary effect.Taking the maximum system profit as the optimization target,micro source maximum capacity,small hydropower reservoir water requirement and storage battery charging and discharging power limitation as constraint conditions,the capacity optimal allocation model of micro-grid is established.The simulation results show that the optimization strategy can reduce the battery capacity and improve the economic benefits of micro-grid.The complementary degree evaluation index is put forward,and it can be proved that the complementary degree of wind,light and water energy is beneficial to reduce the energy storage configuration capacity of the system by comparing the complementary degree of different examples.