It neither has heating problem of the electronics soft starter, nor generates highfrequencyharmonic like SCR.
它没有电子软起动器的发热问题，也不会像晶闸管一样引起高次谐波。
2
As an effective way of eliminating highfrequencyharmonic, active Power Factor Correction (PFC) technology has been deeply researched and has broad application.
有源功率因数校正技术(PFC)作为一种有效的谐波抑制方法，得到了广泛而深入地研究与应用。
3
Highfrequencyharmonic in electric power network can pollute the network, control highfrequencyharmonic is an important research problem in electrical system function.