非侵入式逆变器功率管开路故障诊断方法

发布时间：2018-08-02 19:46

【摘要】：针对逆变器中较高的开关管故障率,该文提出一种非侵入式的逆变器开路故障在线诊断与定位方法。提出适合三相逆变电路的故障特征参数预处理方法,处理逆变器已有传感器所采集的特征信号;建立输出线电压包络线函数和诊断函数,利用线电压包络线和故障参数特征,精确定位开关管开路故障,为逆变系统的容错控制和快速检修提供可靠故障信息。该方法无需采集逆变器控制信号,与逆变控制方式无关;无需增加额外的传感器,受负载影响小,适应性强;采用简单的硬件结构,诊断系统成本低,可靠性高,定位时间短;最后,通过搭建实验样机验证了所提出的理论,通过样机试验分析了负载突变、不同控制频率和不同故障时刻对所提出方法的影响,证明了方法的有效性和适应性。
[Abstract]:In view of the high fault rate of switching tube in inverter, this paper presents a non-invasive on-line fault diagnosis and location method for open circuit of inverter. A preprocessing method of fault characteristic parameters suitable for three-phase inverter circuit is proposed to deal with the characteristic signals collected by the existing sensors of the inverter, and the output line voltage envelope function and diagnosis function are established, and the line voltage envelope line and fault parameter characteristics are used. Accurate location of open circuit fault of switch tube provides reliable fault information for fault tolerant control and quick overhaul of inverter system. This method does not need to collect the control signal of the inverter and has nothing to do with the inverter control mode; it does not need to add extra sensors, so it is less affected by the load and has strong adaptability. The method adopts simple hardware structure, which has the advantages of low cost, high reliability and short positioning time of the diagnostic system. Finally, the proposed theory is verified by building an experimental prototype, and the effects of load mutation, different control frequency and different fault time on the proposed method are analyzed, and the validity and adaptability of the proposed method are proved.
【作者单位】：中南大学;
【基金】：国家重点研发计划(2016YFB1200401)~~
【分类号】：TM464

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