Harmonics are periodic distortions of voltage, present, or ability sine waves. Harmonics in energy distribution methods in many cases are because of non-linear hundreds including switched method dc ability materials and adjustable velocity motor drives.Th? thao Tuy?n Vi?t Nam: Hoàng ??c h?ng kh?i, ch? HLV Troussier tr? tài HLV ??c Th?ng làm t?t