Harmonics are periodic distortions of voltage, existing, or energy sine waves. Harmonics in power distribution units are frequently attributable to non-linear masses including switched method dc electrical power supplies and adjustable speed motor drives.Th?ng kê t? ??ng c?p nh?t khi k?t thúc bu?i t??ng thu?t tr?c ti?p k?t qu? x? s?T.Huy XSMB: Gi