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A Method of IGCT Three-level Converter Fault Identification and Condition Monitoring

Release date:2023-04-26  Number of views:745   Amount of downloads:761   DOI:10.19457/j.1001-2095.dqcd24597

      Abstract: Aiming at the short circuit fault protection of medium voltage three-level converter with IGCT as

the core and the monitoring of changes in main circuit device parameters during operation,a method was proposed to simultaneously realize fault identification of IGCT three-level converter and monitoring of main circuit operation status. The voltage waveform at the back end of the inductance was detected by the hardware circuit and combined with the switching state of the device to predict whether there is a short circuit fault. The peak voltage and peak voltage time in the voltage waveform data were selected as the characteristic values,and the relationship between the electrical parameters of the main circuit and the peak voltage and peak voltage time was derived to form the corresponding data training neural network weight to build a numerical fitting observer,real-time sampled waveform data was fed into the numerical fitting observer to identify the main circuit parameters of the converter online,so as to give an alarm when the parameters change due to abnormal reasons such as faulty soldering,aging,heating,etc.


      Key words: three-level inverter;integrated gate commutated thyristors(IGCT);fault identification;condition

monitoring




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