一种新的三相PWM整流器换流分析方法

A new analysis method for current switching of three phased PWM rectifiers

在三相PWM整流器系统分析和同步旋转变换控制方法的基础上,根据网侧输入电压空间矢量所在的扇区以及三相输入电流方向提出了一种新的换流分析方法.系统稳态运行的一个电网周期被分为12种工作状态,每一种工作状态对应4种开关矢量,每一种开关矢量对应一种电流模式.通过仿真平台进行了大量的仿真实验,得到了每一种电流模式中三相输入电流、6个桥臂电流、直流电容电流以及直流母线电流流向图和数据.实验结果表明这种换流分析方法可以非常简单、清楚地分析三相PWM整流器运行的各种工作过程.

On the basis of sectors in which the special voltage vectors on networks are located and the directions of three phased currents, a new analysis method for current switching of three phased PWM rectifier was put forward. The statuses of the three-phase currents were divided into 12 sub-statuses, each of which corresponds to four switching vectors, each of which corresponds to one current mode. Given were the transition of the inductors on the AC side, the rectification bridge, the capacitor on the direct side and the current on the load corresponding to the individual status. The chart and data of input three phase current, six bridge current, DC capacitance current and DC bus bar current in every current status were obtained by the simulation experiment. The results were summed and analyzed. The process of the system running could be analyzed distinctly and simply by the new method.