说明：  高次谐波严重危害电网的安全运行，因此必须采取有力措施，使谐波量限制在一定范围内，本文介绍如何在实际工作中提高滤波器的质量
(high harmonics seriously endanger the safe operation of power grids, it is necessary to take effective measures, Harmonic so limited in a certain range, the paper how in practical work to improve the quality filter)