Abstract
The open-circuit fault of the power switches in shunt active power filter (SAPF) would exacerbate the harmonic pollution of power grid, and degrade the reliability of the devices and system. A fault diagnosis method is proposed based on reference model and an over-modulation strategy under hardware fault tolerance for SAPF. First, a mathematic model is established for SAPF. Second, the residuals are generated by comparing the outputs of reference model and those of actual model, and open-switch fault is detected and diagnosed by residual evaluation. After that, hardware fault tolerance is performed with the three-phase four-switch (TPFS) topology to isolate the faulty phase. Finally, the over-modulation strategy is proposed to increase the voltage transfer ratio of the TPFS topology. Simulation and experimental results verified the feasibility and effectiveness of the proposed method.
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Foundation item: Project(2012AA051601) supported by the High-Tech Research and Development Program of China
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Peng, T., Zhao, S., Dan, Hb. et al. Open-circuit fault diagnosis and fault tolerance for shunt active power filter. J. Cent. South Univ. 24, 2582–2595 (2017). https://doi.org/10.1007/s11771-017-3672-9
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DOI: https://doi.org/10.1007/s11771-017-3672-9