Harmonics are periodic distortions of voltage, present-day, or electric power sine waves. Harmonics in energy distribution programs are sometimes due to non-linear loads including switched mode dc electrical power provides and adjustable speed motor drives.T.Huy XSMB: Gi?i ??c bi?t k?t qu? x? s? Mi?n B?c ???c bao nhiêu v?y m?i ng??i ?i!Superior-fr