基于电压残差的T型逆变器开路故障诊断方法
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作者单位:

1.西安工业大学 电子信息工程学院;2.西安应用光学研究所

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TM464

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国家重点研发计划(2022YFE0123400);陕西省教育厅专项科研计划项目(22JK0414)。


Open-circuit fault diagnosis method for T-inverters based on voltage residual
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1.School of Electronic Information Engineering,Xi’an Technological University,Xi’an;2.Xi’an Institute of Applied Optics,Xi’an

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    摘要:

    针对T型逆变器发生开路故障后容易导致输出谐波增大、抗干扰能力差的问题,文中提出一种基于电压残差的T型三电平逆变器开路故障诊断方法。首先分析T型逆变器的工作原理和开路故障特性,通过空间矢量脉宽调制(SVPWM)技术,建立系统的状态空间模型。其次,利用正常工况下线电压的参考值与实际传感器测量所得到的电压值进行比较,结合低通滤波处理获得电压残差信号,将其与故障检测阈值对比判断系统是否发生故障。然后建立诊断变量与故障开关管之间的逻辑关系,实现逆变器单管故障的精确定位。最后,通过MATLAB平台对所提出的故障诊断方法进行验证,仿真结果表明,该方法易于实现、诊断速度快且可靠性高。

    Abstract:

    In order to solve the issue of increasing output harmonics and poor anti-interference ability after open-circuit fault of T-type inverter, an open-circuit fault diagnosis method of T-type three-level inverter based on voltage residual is proposed in this paper. Firstly, the working principle and open-circuit fault characteristics of T-type inverters are analyzed, and the state-space model of the system has been constructed via the space vector pulse width modulation strategy. Secondly, the line voltage detected by the actual sensor is contrasted with the reference value of the down-line voltage under normal conditions. The voltage residual signal is obtained through low-pass filtering processing. Compare the residual error with the fault detection threshold to determine whether the system is faulty. Then the logical relationship between the diagnostic variable and the fault switch tube is established to achieve the precise location of the inverter single tube fault. Finally, the proposed fault diagnosis method is verified by the MATLAB platform, and the simulation results show that the method is easy to implement, fast and reliable.

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张彬彬,武菲菲,杨冰,等. 基于电压残差的T型逆变器开路故障诊断方法[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-18
  • 最后修改日期:2024-05-22
  • 录用日期:2024-05-29
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