Harmonics are periodic distortions of voltage, latest, or electrical power sine waves. Harmonics in electrical power distribution methods are sometimes a result of non-linear masses like switched method dc power supplies and adjustable speed motor drives.HLV ??c Th?ng kh?ng ??nh tham v?ng vô ??ch Cúp Qu?c gia và ch? ra ?T Vi?t Nam c?n m?t g??ng