Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in energy distribution methods tend to be caused by non-linear hundreds which include switched method dc energy provides and adjustable speed motor drives. Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)K?t qu? c?a ?ài nào s?