Power electronics broad application in power systems brings serious harmonic pollution. This paper introduces harmonic harm, the measure of restraining harmonic and the basic principle of filter.

• 摘要电力电子装置的广泛应用，给电力系统造成了一定的谐波污染，文中简要论述谐波的危害、谐波的治理措施及无源滤波器和有源滤波器的基本原理。