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系统采用交流斩波控制调压技术，并介绍了该系统的速度和位置测试方法。
Ac chopping voltage regulator is characterized of high performance. The testing method of its speed and location is introduced.
文中详细分析了3电平交流斩波电路和3电平矩阵电路的工作原理，介绍了3电平矩阵电路所采用的控制方法。
The operation of 3 level AC chopper and 3 level matrix converters are introduced, the control method applied to 3 level matrix converter is presented.
矿用电机车的速度控制方式包括串电阻式、直流斩波式和交流变频式三种。
The mode of speed control for mining tram includes three types of series resistances. Dc chopper and AC converter.
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