介绍了20辊可逆冷轧机主传动系统组成，对主传动控制方案选择交-直-交变频调速还是交-交变频调速进行了分析研究，并对主电机采用异步机还是同步机进行了比较。介绍了交-直-交变频调速装置的构成及功能，重点阐述了变频器的功率元件IEGT、主动前端单元、三电平中性点钳位及无编码器PWM矢量控制等新技术。通过现场实际应用展望了交流变频调速系统的发展方向。%The composition of the main drive system of 20-roller reversing cold rolling mill is introduced, and the main drive control scheme that using AC-DC-AC converter or using AC-AC converter is analyzed. It also compares the asynchronous motor with the synchronous motor as the main motor. The composition and the function of AC-DC-AC converter are presented, and its new technologies such as IEGT, AFE, 3LNPC, PWM EVC and so on are described in detail. By practical application it shows the development of AC variable frequency speed control system.
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