考虑双维波动性的地铁冲击负荷网储协同平抑策略

Network-storage coordinated suppression strategy of metro impact load considering dual-dimension volatility assessment

地铁列车频繁启停使其牵引负荷出现短时间大幅度的冲击,容易导致变压器绝缘加速老化、引发主变过载风险。针对这一问题,本文提出一种协同网储的地铁负荷冲击优化策略。首先,基于地铁负荷时序特性剖析冲击性负荷形成机理,建立考虑功率曲线特征的双维波动性指标,定量描述冲击程度。其次,分别以系统经济性最优与负荷冲击最小为上下层目标,建立网架拓扑与储能装置协调控制的双层优化模型,求解最优开关变动及储能调度策略。最后,以上海某地铁线路实际供电负荷为例,结合多场景进行验证分析,结果表明所提方法能有效平抑冲击性负荷,实现供电可靠性与经济性的提升。

Frequent startup and shutdown of metro trains will cause a large impact on the traction load in a short time,which will easily lead to accelerated aging of transformer insulation and overload risk of main transformer.To solve this problem,a coordinated network storage optimization strategy for subway load impact is proposed.Firstly,based on the time-series characteristics of subway load,the formation mechanism of impact load is analyzed,and a two-dimensional fluctuation index considering the characteristics of power curve is established to quantitatively describe the impact degree.Secondly,taking the optimal system economy and the minimum load impact as the upper and lower objectives respectively,a double-layer optimization model for the coordinated control of grid topology and energy storage devices is established to solve the optimal switching change and energy storage scheduling strategy.Finally,the actual power supply load of a subway line in Shanghai is taken as an example,and the results show that the proposed method can effectively suppress the impact load and improve the reliability and economy of power supply.