Open-circuit fault diagnosis method for voltage source type inverter in UPS system

The invention discloses a voltage source inverter open-circuit fault diagnosis method in a UPS system, and the method comprises the steps: obtaining a diagnosis parameter, carrying out processing andconversion of the diagnosis parameter, and obtaining a deviation signal and a normalized current mean value; judging the operation condition of the voltage source inverter and whether abnormal behaviors exist in the operation period or not according to the deviation signal; and if judging that the voltage source type inverter has the abnormal behavior, judging which switching tube in the voltage source type inverter is abnormal based on the normalized current average value. In the embodiment of the invention, open-circuit fault diagnosis is carried out on the voltage source type inverter in the UPS system under the condition that an additional sensor does not need to be installed. 本发明公开了一种UPS系统中电压源型逆变器开路故障诊断方法，其中，所述方法包括：获取诊断参数，对所述诊断参数进行处理和转换，获取偏差信号和归一化的电流平均值；通过所述偏差信号判断电压源型逆变器的运行状况和是否在运行期间存在异常行为；若判断所述电压源型逆变器存在异常行为时