风光蓄互补发电系统容量的改进优化配置方法

风光互补发电系统利用风能与太阳能的互补特性,相比于单独的光伏发电或风力发电,其输出功率波动小。合理配置风电/光伏/储能的容量,既可提高系统供电可靠性,又可降低系统成本。针对风光蓄互补发电系统,提出一种改进的容量优化配置方法,考虑独立和并网两种模式,对风力发电、光伏发电和蓄电池的容量进行最优配置。该方法充分利用风光互补特性,在系统独立运行时,只需较小的蓄电池容量即可保证高供电可靠性,并可减少蓄电池的充放电次数和放电深度;在系统并网运行时,进一步提出采用分时段优化策略来配置所需蓄电池的容量,保证负荷供电需求和入网功率的波动特性满足要求。算例验证了所提改进优化方法的合理性和优越性。

An Improved Optimal Sizing Method for Wind-solar-battery Hybrid Power System

Compared with separate photovoltaic or wind power generation,the hybrid wind-solar power generation system can achieve a less fluctuation of output power due to the complementary characteristics of wind and solar resources.A reasonable capacity of wind/solar/battery can not only improve the power supply reliability,but also reduce the total cost of the system.This paper proposed an improved optimal sizing method for hybrid wind-solar-battery power system,considering the system working in both stand-alone and grid-connected modes.The proposed method took full advantage of the complementary characteristics of wind and solar,which could achieve a high power supply reliability while require less battery capacity in stand-alone mode.Moreover,the depth of discharge and charge/discharge cycles of the battery was reduced.And the sub-period optimization strategy was further utilized to calculate the optimal battery capacity,which could ensure both the load demand and fluctuation of power injected into the grid to meet the requirements in grid-connected mode.A case study was presented to verify the advantages of the improved optimal sizing method.