基于瞬态电流角度的维也纳整流器单管开路故障的在线辨识

Online Identification Method for VIENNA Rectifier Single Switch Open-fault Based on Transient Current Angle Information

为提高维也纳整流器单管开路故障的辨识速度,通过分析单管开路故障后的电流故障特征,在不增加额外硬件电路的条件下,提出了一种基于瞬态电流角度的单管开路故障辨识方法。此方法利用输入电流的角度信息与非故障相电流瞬时值进行故障相定位和故障开关管定位,实现了维也纳整流器单管开路故障的在线辨识,具有良好的抗负载波动能力,并将故障开关管定位时间缩短至与故障相定位时间一致,能够在10%~70%工频周期内在线辨识维也纳整流器单管开路故障,对整流器的安全运行和后续维修提供了保障。

To improve the identification speed of single switch open-fault of VIENNA rectifier, through analyzing the characteristics of current in the VIENNA rectifier of single switch open-fault, an identification method based on the angle of current without additional hardware circuits is proposed. By using the angle of input currents and the instantaneous value of non-fault phase currents to locate fault-phase and fault-switch, the method realizes online identification of single switch open-fault in the VIENNA rectifier. Meanwhile,the VIENNA rectifier has strong resistance to load fluctuation and shortens the time of locating fault-switch the same as the time of locating fault-phase. The experimental results show that it can identify the single switch open-fault of VIENNA rectifier on line in 10%~70% power frequency cycle, which guarantees the safe operation and subsequent maintenance of the rectifier.