基于电压残差的三相逆变器故障诊断

针对三相逆变器开路故障诊断问题,研究了一种具有动态参考量的电压残差故障诊断方法。利用逆变器闭环控制系统现有的相电压采样信号,将延迟一个周期的相电压波形作为动态参考,与当前的相电压信号进行比较得到电压残差波形,通过设置合理的故障检测阈值,实现逆变器开关管开路故障的准确诊断。仿真结果验证了该方法具有抗不平衡负载和负载突变干扰的能力,且诊断时间小于一个周期,具有容易实现、无需增加硬件的优点。

A Three-Phase Inverter Fault Diagnosis Based on Voltage Residual

In view of the open circuit fault diagnosis of three phase inverter, a fault diagnosis method based on residual theory with dynamic reference quantity is proposed. This paper is to utilize the existing phase voltage sampling signal of the inverter closed loop control system, take the phase voltage waveform with one period delay as a dynamic reference, and obtain the voltage residual waveform by comparing the dynamic reference voltage signal with the current phase voltage signal through setting a reasonable fault detection threshold for realizing the accuracy diagnosis of the open circuit fault of the inverter. The simulation results show that this method has the ability to resist unbalanced load and the load mutation interference, and the diagnosis time is less than one cycle, and has the advantages of low complexity and easy implementation.