摘要
针对电气化铁路牵引系统谐波补偿的实时性要求,提出基于基波跟踪技术的谐波检测新方法。其核心是采用小波变换的Mallat算法提取牵引负荷的基波分量,以1/2周期为采样更新速度,递推地进行基波预报,再无时滞地获取需检测的谐波分量,解决了谐波补偿检测环节中的时滞问题,对于牵引负荷操作中产生的检测误差仅存在1/2个周期,能够满足工程的需要。仿真结果表明,提出的谐波检测方法实现了无时滞谐波检测的预期目标,为谐波补偿的实时信号检测提供了1种有效方法。
For the real time demand of harmonic compensation in the traction system of electrified railway, a new harmonic detection strategy is presented based on fundamental tracing technology. Its core is to extract the fundamental component of traction load current by adopting Mallat algorithm of wavelet transform. Taking half cycle as the update speed for sampling, fundamental wave is deduced and forecasted by degrees and the harmonic component to be detected is obtained without time lag, which can solved time lag problem in the detection of harmonic compensation. The detection error engendered in traction load operation is only in existence hail cycle, this can meet the demand of engineering. Simulation results show that the proposed harmonic detection strategy has achieved the anticipaued goal of detecting harmonic wave without time lag and provided an effective method for real-time detecting the signals of harmonic compensation.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2008年第5期87-90,共4页
China Railway Science
基金
国家自然科学基金资助项目(50377003)
关键词
电力牵引
谐波检测
小波变换
基波跟踪
电气化铁路
Electric traction
Harmonic detection
Wavelet transform
Fundamental wave tracing
Electrified railway
