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.
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。
Computer simulation and experiments show that the active power filter system can effectively suppress the high frequency harmonics and reactive currents at the same time.
通过计算机仿真及试验证明，该有源电力滤波系统能很好地同时抑制电网中的高次谐波及无功电流。
However, SMPS operate at high switching frequencies, and the associated transient pulses are full of high frequency harmonics that may cause electromagnetic interference (EMI).
然而，由于开关电源工作在高频状态，其产生的瞬态脉冲包含有能够发射电磁干扰(emi)的的高频谐波。
The digital circuits are introduced in the SPWM inversion, which have brought the elimination of harmonics, high switching frequency, simplified circuits and high reliability.
而对于SPWM逆变，采用数字电路实现SPWM触发脉冲的生成，在消除谐波、提高开关频率、简化电路结构，提高集成度和可靠性等方面，取得了很好的效果。
The high-frequency harmonics from charge rectifier of storage battery and its suppression means were discussed.
讨论了蓄电池充电整流器所产生的高次谐波及其抑制措施。
Meanwhile, in the main circuit structure, the use of LCL filter, improved high frequency switching harmonics suppression.
同时，在主电路结构中，采用LCL滤波，改善了对高频开关谐波的抑制。
Meanwhile, in the main circuit structure, the use of LCL filter, improved high frequency switching harmonics suppression.
同时，在主电路结构中，采用LCL滤波，改善了对高频开关谐波的抑制。
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