基于光伏出力特性的分布式光储系统优化调度策略

Optimal scheduling strategy of distributed PV‒energy storage systems based on PV output characteristics

随着我国能源结构的转型升级,太阳能发电愈发受到重视。然而,大规模分布式光伏并网会引起电网的功率波动。储能的介入有助于系统调峰/调频。基于此,提出一种分布式光储系统联合优化调度方法。首先,从经济性和技术性角度构建分布式光储系统优化调度模型,以有功功率波动方差最小为目标,对储能模组的充放电功率进行优化。其次,基于光伏出力预测提出实时调度策略,提升分布式光储系统并网的有序性,有助于平抑电网负荷波动以及调节负荷峰谷差。最后,通过设计具体仿真算例验证了方法的可行性。

With the transformation and upgrading of China's energy mix,solar power generation technology has received increasing attention.However,large-scale grid-connection of distributed PV power stations will cause power fluctuations in the power grid.Since energy storage systems can facilitate load and frequency regulations,a joint optimal scheduling method for PV‒energy storage systems is proposed.Firstly,the optimal scheduling model of a PV‒energy storage system is constructed considering its economy and technical indicators,and the charging and discharging power of the energy storage modules are optimized with the aim of minimizing the variance of active power fluctuations.Secondly,a real-time scheduling strategy based on predicted PV outputs is proposed to improve the orderly grid-connection of distributed PV‒energy storage systems,which can smooth the load fluctuation of the grid and reduce load‒valley difference.Finally,a simulation study is designed and carried out to verify the feasibility of the method.