高铁供电系统的不平衡负序电流 对电力系统的影响

Influence of Unbalanced Negative Sequence Current of High Speed Railway Power Supply System on the Electric Power System

针对高铁供电系统的不平衡负序电流对电力系统影响问题,从理论分析和仿真计算两个方面研究了高铁牵引站不平衡负序电流对电力系统的影响;在理论分析上,建立了V/X接线方式的高速铁路牵引供电系统的数学模型,提出了一种V/X接线方式下注入电力系统的负序分析方法;在仿真计算上,采用PSCAD/EMTDC完成了吉林延边地区5个高铁牵引站对电力系统影响的计算。研究结果表明,延边地区的5个高铁牵引站对电力系统的影响的情况不同,公共连接点短路容量比较小的供电系统的三相电压不平衡度存在超标的现象。

Aiming at the influence of unbalanced negative sequence current on the power system of high speed railway power supply system, the influence of unbalanced negative sequence current on the power system of high speed rail way traction station is studied from two aspects of theoretical analysis and simulation calculation. In the theoretical analysis, a mathematical model of high speed railway traction power supply system with V/X connection mode is established. An analysis method of negative sequence for power system with V/X connection mode is proposed. In simulation calculation, use PSCAD/EMTDC to complete the calculation of the influence of five high speed railway traction station on the power system. The research results show that the influence of five high speed railway traction station on power system in Yanbian area is different, there is excessive phenomenon of the unbalanced voltage degree when the short circuit capacity of PCC point is small.