电气化铁路飞轮储能技术研究

Research on Flywheel Energy Storage Technology for Electrified Railway

电气化铁路是一类负荷波动剧烈的大宗工业电力用户,牵引负荷功率峰值不仅在技术上引起以负序为主的电能质量问题,还在经济上直接关乎用户效益。根据牵引负荷峰谷特性,对飞轮储能装置变流器的控制策略及能量管理策略进行分析,提出基于牵引负荷功率来控制飞轮充放电的能量管理策略;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来选取充放电控制阈值,并对该方法下确定的阈值进行案例分析。最后进行仿真和实物验证,结果表明,由于飞轮储能装置的加入,可以减少牵引变压器的基本容量减少电费,同时也可降低负序电流与电压不平衡度,从而改善电网侧电能质量。

Electrified railway belongs to a large industrial user.The peak power of traction load not only causes the power quality problems mainly caused by negative sequence,but also directly affects the users’benefit in economy.According to the characteristics of the peak and valley of the traction load,the control strategy and energy management strategy of flywheel energy storage device converter were analyzed,and an energy management strategy based on traction load power to control flywheel charging and discharging was proposed.Combined with the characteristics of electrified railway operation diagram that is characterized by a fixed period of days,based on the historical data,this paper further proposed the use of the statistical value of traction load to select the threshold of charge and discharge control,and maked a case analysis of the threshold determined under this method.Finally,simulation and physical verification were carried out.The results show that the basic capacity of the traction transformer can be reduced by the addition of the flywheel energy storage device.At the same time,the negative sequence current and the voltage imbalance can be reduced and the power quality of the power grid side can be improved.