Harmonics are periodic distortions of voltage, present, or electricity sine waves. Harmonics in power distribution techniques tend to be attributable to non-linear loads for instance switched manner dc electric power materials and adjustable pace motor drives.H?i ??ng x? s? ki?n thi?t mi?n B?c bao g?m 28 ??n v? thành viên, trong ?ó có six ??n v