城市轨道交通系统谐波的提升小波仿真分析

Wavelet-lifting Simulation on Harmonics of Urban Mass Transit System

城市轨道交通牵引供电系统采用12脉波整流机组和24脉波整流机组进行整流,所产生谐波以11次、13次、23次和25次谐波为主。针对城市轨道交通牵引供电系统谐波的特征,采用小波变换和提升小波变换对城市轨道交通牵引供电系统所产生的高频谐波信号进行仿真研究,并对其结果进行比较。结果表明:与小波变换相比,提升小波变换应用于城市轨道交通牵引供电系统的谐波分析,其独特的结构有效地减少了计算的复杂度,降低了运行时间,是一种快速的小波实现方法,对实现城市轨道交通牵引供电系统谐波信号的快速、实时检测具有很好的应用价值。

Urban mass transit adopts 12 pulse and 24 pulse rectifier, whose high frequency harmonics mainly is 11 times、13 times、23 times and 25 times harmonics. Wavelet-lifting transform was used to analysis the high frequency harmonics of urban mass transit and simulation was carried on. Simulation results expressed that wavelet lifting transform, compare to wavelet transform, could lessen calculation complexity and depress course due to its particular structure. It’s a kind of fast method to implement wavelet transform and of good value on the measurement of urban mass transit harmonics swiftly and truly.