晶闸管串级调速系统是一种廉价、简易的调速系统，但是传统串调系统存在着诸如功率因数低、谐波污染严重等弊端。

Speed regulation system using cascade control method with thyristor is a low-cost system, but the classic system has some shortages, such as low power factor, serious harmonic pollution and etc.

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晶闸管串级调速系统是一种廉价、简易的调速系统，但是传统串调系统存在着诸如功率因数低、谐波污染严重等弊端。

Thyristor cascade control system is a low-cost system, but the traditional cascade control system has some shortages, such as a low power factor, serious harmonic pollution etc.

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