高频斩波串级调速系统功率因数的分析与计算

Analysis and Calculation for Power Factor of the High-frequency Chopped Wave Cascade Speed Control Drive System

相对于变频调速系统,高频斩波串级调速系统具有节能效率高、结构简单、技术难度小等优点,在交流调速中得到了广泛应用。但和传统串级调速一样,该系统的严重缺点之一是功率因数低,而且随着负载变化和速度的调节,系统功率因数的变化范围很大。所以有必要准确分析计算其功率因数。本文介绍了高频斩波串级调速系统的工作原理,在此基础上提出了一种新的计算高频斩波串级调速系统功率因数的简化算法,总结了影响高频斩波串级调速系统功率因数的几大因素,最后通过建立试验系统进行验证,证实该算法的可靠性,对实际工程设计有实用价值。

Compared with frequency conversion speed control,high-frequency chopped wave cascade speed control drive system has such advantages as good efficiency on energy saving,simple structure and little technical difficulty,etc.So,it is widely used in AC governing speed field.However,as the traditional cascade speed governing drive,low power factor is the same overt weakness to the high-frequency chopped wave cascade speed control drive system.In addition,the power factor could change in a large range with the speed adjustment and changing load.So it is very necessary to analyse and calculate the power factor accurately.A compact algorithm to calculate the power factor of chopped wave cascade speed control drive system is put forward on the basic of introduction of the radical theory about it.A few of factors impacting on the power factor of chopper cascade speed control drive system are summed up.At last,A simulation validating system is founded,and which prove that the algorithm is reliable and practical on engineering design.