Back to Search
Start Over
Open-Circuit Fault Diagnosis and Tolerance Strategy Applied to Four-Wire T-Type Converter Systems.
- Source :
-
IEEE Transactions on Power Electronics . Jun2019, Vol. 34 Issue 6, p5764-5778. 15p. - Publication Year :
- 2019
-
Abstract
- Due to the zero-sequence currents in the four-wire systems, the three-phase currents become more complex on both amplitudes and phases in the unbalanced load conditions, so that the existing open-circuit (OC) fault diagnosis methods of the switching devices cannot be directly used. In this paper, an OC fault diagnosis strategy applied to four-wire T-type converter systems is proposed, which is implemented by decomposing the circuit model into a positive- and negative-sequence model and a zero-sequence model, and locating the OC fault based on the law of positive- and negative-sequence voltage error offsets and zero-sequence voltage error offsets. The proposed diagnosis method is suitable for both unbalanced load and unbalanced input voltage conditions. Meanwhile, the differences of fault-tolerant control between four-wire and three-wire systems are analyzed and compared. An effective fault tolerance strategy for inner OC faults applied to four-wire T-type converter systems is presented, which owns the ability to suppress dc bus imbalance. Simulation and experimental results are presented to verify the correctness of the proposed strategy. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 34
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 136117653
- Full Text :
- https://doi.org/10.1109/TPEL.2018.2869396