Open-Circuit Fault Diagnostic Method for Three-level Inverters Based on Park's Vector

Inverter is a key component of power conversion, and plays an important role in various applications. For the purpose of enhancing the reliability and the safety of inverters, a diagnostic method for open-circiit of three-level inverters is presented, which can effectively detect fault condition and distinguish faulty power devices. For fault detection, the normalozed Park's vector is applied. For fault localization, the fault arm is determined according to the average value of absolute current value, and then the specific fault power device is located with the polarity of the normalized current average value. The simulation results show that the diagnosis method can effectively diagnose the faults, and has certain robustness.

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