101. IGBT Open-Circuit Fault Diagnosis in a Quasi-Z-Source Inverter.
- Author
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Yaghoubi, Mokhtar, Moghani, Javad Shokrollahi, Noroozi, Negar, and Zolghadri, Mohammad Reza
- Subjects
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OPEN-circuit voltage , *ELECTRIC power system faults , *ELECTRIC inverters , *PHOTOVOLTAIC power systems , *PHASE modulation , *ALGORITHMS - Abstract
In this paper, a fast and practical method is proposed for open-circuit (OC) fault diagnosis (FD) in a three-phase quasi-Z-source inverter (q-ZSI). Compared with the existing fast OC FD techniques in three-phase voltage source inverters, this method is more cost-effective since no ultrafast processor or high-speed measurement is required. Additionally, the method is independent of the load condition. The proposed method is only applicable to Z-source family inverters and is based on observing the effect of shoot-through intervals on the system variables during switching periods. The proposed algorithm includes two consecutive stages: OC detection and fault location identification. When both stages of the OC FD algorithm are done, a redundant leg is activated and utilized instead of the failed leg. The accuracy of the proposed method is confirmed by the experimental results from a low-voltage q-ZSI prototype. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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