高铁牵引变电所储能技术研究及经济性分析

Energy Storage Technology Research and Economic Analysis of Traction Substations for High Speed Railway

电气化铁路属于负荷波动性极强的大工业用户,在牵引负荷功率达到峰值时,谐波、负序等电能质量问题突出,且负荷峰值与基本电费息息相关。根据牵引负荷峰谷特性,对牵引变电所储能系统的拓扑结构进行分析,提出基于实时牵引负荷功率控制储能装置充放电的策略;结合电气化铁路运行图以日为固定周期的特点,以历史运行数据为基础,进一步提出利用牵引负荷统计值选取充放电阈值,并分析储能系统的充放电特性;最后进行经济性分析及优化,结果表明安装储能装置后可以节省大量电费,经济效益可观。

Electrified railways are a big industrial power consumer with strong load fluctuation.When the traction load power reaches its peak value,harmonic,negative sequence and other power quality problems are becoming more prominent,and the peak load is closely related to the basic tariff.According to the peak valley characteristics of traction load,the topological structure of energy storage system in traction substation is analyzed,and the charging and discharging strategy of energy storage device based on real-time traction load power control is proposed;according to the characteristics of train diagram for electrified railway with daily fixed cycle and historical operation data as the basis,this paper further proposes to select the charging and discharging threshold by using the statistical value of traction load,and analyzes the charging and discharging characteristics of energy storage system;finally,the economic analysis and optimization are carried out,the results show that a huge amount of electricity charges can be saved after installing the energy storage devices,whose economic benefits are considerable.