基于矢量调制的维也纳整流器共模电压抑制研究

摘要

Aiming at the safety and reliability of the Vienna rectifier, the common-mode voltage and neutral-point imbalance of the Vienna rectifier were studied. A vector modulation was proposed to reduce the common mode voltage and control the voltage balance of the DC side. First of all,the reason of common mode voltage was analyzed. The proposed vector modulation can reduce the common mode voltage. Then the reason of the neutral-point balance was analyzed. The proposed vector modulation can realize the neutral-point balance control at the same time. Vienna rectifier test bench was used to test the neutral point balance control and common mode voltage suppression effect of Vienna rec-tifier. The results show that the common mode voltage of the Vienna rectifier can be effectively suppressed,and the line voltage of the Vienna rectifier is a standard five-level waveform. The DC-side capacitor voltage is effectively controlled and the distortion rate of the input current is effectively controlled.%针对维也纳整流器的安全可靠问题,对维也纳整流器的共模电压高和中点不平衡等方面进行了研究,提出了一种矢量调制方法以及时实现共模电压减少以及直流侧电压平衡控制.首先分析了共模电压产生的原因,通过提出的矢量调制减少了共模电压;然后分析了中点平衡产生的原因,通过所提出的矢量调制同时实现了中点平衡控制;利用维也纳整流器试验台对维也纳整流器的中点平衡控制和共模电压抑制效果进行了测试.研究结果表明:维也纳整流器的共模电压能够有效地得到抑制,而且维也纳整流器的线电压为标准的五电平波形,直流侧电容电压得到有效控制,输入电流的畸变率得到有效控制.