三电平脉冲整流器的仿真与分析

随着电力电子技术的发展，高功率因数，低谐波的PWM整流器也逐渐得到了应用。PWM整流器消除了传统整流电路（如二极管构成的不可控整流电路和晶闸管构成的相控整流电路）的谐波分量大、功率因数低且不可任意控制等缺点。当整流装置应用于高压场合时，需要使用高反压的功率开关管IGBT或将多个功率开关管串联使用，而三电平整流器2]的每一个功率开关器件所承受的关断电压仅为直流侧电压的一半，因此在同等条件下直流母线电压可以提高一倍，故它比两电平更适合于高压、大功率应用场合。本实验以三电平中点箝位PWM整流器2]为研究对象。

The Simulation and Analysis of the Three-level Pulse Rectifier

With the development of power electronic technology, the PWM rectifier of high power factor and low harmonic has also been gradually applied. The shortcomings of traditional rectification circuits （for instance, the uncontrollable rectification circuits consist of diodes and the phase-controlled rectifier circuits consist of thyristors）, such as heavy harmonic component, low power factor and can not being arbitrarily controlled, etc have been eliminated in PWM rectifier. As the rectifying device is applied for the occasion of high voltage, the high inverse-voltage power switching tube IGBT or the multiple power switching tubes in series are needed, but the bearing turn-off voltage of each power switching element of the three- level rectifier is only a half of the voltage of DC side, thus the voltage of DC bus can be doubled under the same conditions, so it is more suitable for the applications of high voltage and large power than the two-level rectifier. The three-level neutral point clamped PWM rectifier is taken as the object of study in this experiment.