近年来，大量的非线性负荷，如固态开关设备、整流器、逆变器，以及智能电网

近年来，大量的非线性负荷，如固态开关设备、整流器、逆变器，以及智能电网、分布式电源的并网运行，使得电网出现大量的谐波污染。根据傅里叶变换，可以将谐波进行分解，我国规定工频基波50Hz，谐波又可以分为整数次谐波、间谐波和次谐波。整数次谐波的频率为基波频率的整数倍，间谐波是介于基波与整数次谐波之间的谐波成分，而次谐波是频率比基波还低的谐波。

近年来，大量的非线性负荷，如固态开关设备、整流器、逆变器，以及智能电网、分布式电源的并网运行，使得电网出现大量的谐波污染。 根据傅里叶变换，可以将谐波进行分解，我国规定工频基波50Hz，谐波又可以分为整数次谐波、间谐波和次谐波。 整数次谐波的频率为基波频率的整数倍，间谐波是介于基波与整数次谐波之间的谐波成分，而次谐波是频率比基波还低的谐波。

In recent years, a large number of non-linear loads, such as solid-state switchgear, rectifiers, inverters, as well as the grid connected operation of smart grid and distributed power supply, make the grid appear a lot of harmonic pollution. According to the Fourier transform, the harmonics can be decomposed. In our country, the fundamental frequency is 50Hz, and the harmonics can be divided into integer harmonics, interharmonics and subharmonics. The frequency of the integer harmonics is an integral multiple of the fundamental frequency, and the interharmonics are the harmonic components between the fundamental and the integer harmonics, while the subharmonics are the harmonics whose frequency is lower than the fundamental.<br>