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大容量变频调速系统中存在相当多的短时间尺度过渡过程,如电力电子器件的开关过程、换流回路的转换等,其作用时间一般在微秒至纳秒级。这些过渡过程将直接影响到电力电子装置运行的可靠性,因此,抛开传统的稳态研究模式,从脉冲的短时间尺度来看待这些过渡过程非常必要。该文以三电平高压大容量变频调速系统为试验平台,在得到大容量变频调速系统中各类波过程数学函数的同时,着力将PWM脉冲进行系统分类,综合考虑各类脉冲产生的原因及其作用效果,分析了最小脉宽对于系统动态和稳态性能的影响。试验结果验证了以上分析的正确性。
There are quite a few short-time scale transition processes in the large-capacity frequency control system, such as the switching process of power electronic devices, the conversion of commutation loops and the like, and the acting time is generally in the microsecond to nanosecond range. These transitional processes will directly affect the reliability of the operation of power electronic devices. Therefore, it is necessary to treat these transition processes from the short time scale of impulses aside from the traditional steady-state research mode. In this paper, the high-voltage three-level high-voltage variable frequency speed control system as the test platform, large-capacity inverter speed control system in the wave function of various mathematical functions at the same time, focus on the PWM pulse system classification, considering all kinds of pulse generated The reason and the effect of the system, the influence of the minimum pulse width on the system dynamic and steady state performance is analyzed. The test results verify the correctness of the above analysis.