With rapid development of electric power and electron technique, nonlinear equipments are applied in power drawing system widely, which will cause harmonic harm question inevitably.

随着电力电子技术的飞速发展，非线性装置被广泛应用于电力牵引系统，这就不可避免地引发了谐波危害问题。

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In the course of laser-arc hybrid welding, the high frequency caused by drawing arc interfered the control system which make the laser and electric arc not able to realize the hybrid welding.

激光-电弧复合焊接过程中，由于引弧产生的高频干扰了激光器的控制系统，造成了激光和电弧不能实现复合焊接。

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The saving energy control system is proposed for problem of oil drawing machine electric driver which efficiency and power factor is low.

针对抽油机电驱动装置效率和功率因数低、耗能严重的问题，研制了一台新型的抽油机节能控制系统。

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