Because the electric power system harmonics have badly been polluting the electric environment, all nations are rather concerned about the harmonics and enter the research of harmonics actively.

• 电力系统谐波对电力系统环境造成严重污染,引起世界各国都对谐波问题给予了十分的关注和关心,并积极地对谐波进行讨论和研究。