Diagnosis Strategy for a Faulty Leg in the H-Bridge of CHB-Nl Converters

Resumen: This research paper proposes a diagnosis scheme for open circuit faults (OCFs) in the whole leg of cascaded H-bridge converters with n-levels (CHB-nL). This work considers a single-phase operation of the CHB-nL converter with a shunt active filter application. The fault detection and isolation goal is accomplished by analyzing the capacitor current in each H-bridge. Our analysis shows that this current is always non-negative after a faulty leg condition. So to avoid extra measurements, a low-pass filtered version of each capacitor voltage is employed to compute the residual. The residuals provide specific characteristics that allow to detect and isolate the faulty leg in the CHB-nL converter without the necessity of using additional sensors. The proposed diagnosis strategy is validated in simulation with a CHB-7L topology, with different faulty legs scenarios and a load disturbance test.

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K.O. Mtepele, D.U. Campos-Delgado & A.A. Valdez-Fernández. Diagnosis Strategy for a Faulty Leg in the H-Bridge of CHB-Nl Converters. Memorias del Congreso Nacional de Control Automático, pp. 471-476, 2018.

Palabras clave

Fault diagnosis, open-circuit faults, multilevel converter

• Z. Peng, H. Akagi, G. Escobar, and A. Nabae, A new approach to harmonic compensation in power systemsa combined system of shunt passive and series active filters IEEE Trans. on Ind. Appl., 26:983-990, 1990.
• A. Valdez-Fernández, P. R. Martínez-Rodríguez, G. Escobar, C. A. Limones-Pozos, and J. M. Sosa, A Model-Based Controller for the Cascade H-Bbridge Multilevel Converter Used as a Shunt Active Filter. IEEE Trans. Ind. Electron., 60:5019-5028, 2013.
• Mirafzal, Survey of Fault-Tolerance Techniques for Three-Phase Voltage Source Inverters. IEEE Trans. Ind. Electron., 61:5192-5201, 2014.
• Shunfeng Yang, Yi Tang and Peng Wang Open-circuit fault diagnosis of switching devices in a modular multilevel converter with distributed control. 2017 IEEE Energy Conversion Congress and Exposition (ECCE), 4208-4214, 2017.
• U.M. Choi, F. Blaabjerg, and K. B. Lee, Study and Handling Methods of Power IGBT Module Failures in Power Electronic Converter Systems. IEEE Trans. Pow. Electron., 30:2517-2533, 2015.
• Ji, J. Zhao, Y. Sun, X. Yao, and Z. Zhu, Fault-Tolerant Control of Cascaded H-Bridge Converters Using Double Zero-Sequence Voltage Injection and DC Voltage Optimization. Journal of Power Electron., 14:946-956, 2014.
• Shu, C. Ya-Ting, Y. Tian-Jian, and W. Xun, A novel diagnostic technique for open-circuited faults of inverters based on output line-to-line voltage model. IEEE Trans. Ind. Electron., 63:4412-4421, Jul. 2016.
• T. An, L. Sun, and L. Z. Sun, Current residual vectorbased openswitch fault diagnosis of inverters in PMSM drive systems. IEEE Trans. Ind. Electron., 30:2814- 2827, May. 2015.
• Jlassi, J. O. Estima, S.K. El Khil, N. M. Bellaaj, and A. J. M. Cardoso, Multiple open-circuit faults diagnosis in back-to-back converters of PMSG drives for wind turbine systems. IEEE Trans. Ind. Electron., 30:2689- 2702, May. 2015.
• O. Mtepele, D. U. Campos-Delgado, A. ValdezFernandez and J. A. Pecina-Snchez, Fault tolerant controller for a generalized n-level CHB multilevel converter. 13th Int. Conf. on Power Electronics (CIEP), 75-80, Guanajuato, MX, 2016.
• K.O Mtepele, J. A. Pecina-S´anchez, D.U CamposDelgado and A. A. Valdez-Fernández, Open Circuit Fault Diagnosis Strategy for a Generalized n-Levels CHB Multilevel Converter, Congreso Nacional de Control Automático (CNCA), 205-210, Queretaro, MX, 2016.
• K.O Mtepele, D.U Campos-Delgado and A. A. ValdezFern´andez, J. A. Pecina-S´anchez, Fault Diagnosis for Generalized n-Levels 3-Phase CHB Multilevel Converters, Congreso Nacional de Control Autom´atico (CNCA), 14-19, Nuevo Leon, MX, 2017.
• Alavi, D. Wang, and M. Luo, Model-based Diagnosis and Fault Tolerant Control for Multi-Level Inverters. In Proc. IECON 2015, 1548-1553, Yokohama, Japan, 2015.
• Ouni, J. Rodriguez, et al., A Fast and Simple Method to Detect Short Circuit Fault in Cascade H-Bridge Multilevel Inverter. In Proc. ICIT 2015, 866-871, Seville, Spain, 2015.
• A. Valdez-Fernández, K.O Mtepele, and D.U CamposDelgado, A Generalized Model-Based Controller for the n-level CHB Multilevel Converter Used as a Shunt Active Filter. IEEE Int. Autumn Meet. on Pow. Electron. and Comp. (ROPEC), Guerrero, MX, Nov. 2015.
• Wang, H. Xu, J. Han, H. Bouchikhi, and M. H. Benbouzid, Cascaded H-Bridge Multilevel Inverter System Fault Diagnosis Using a PCA and Multiclass Relevance Vector Machine Approach. IEEE Trans. Pow. Electron., 30:7006-7018, 2015.
• Kouro, M. Malinowski, K. Gopakumar, J. Pou, L. G. Franquelo, B. Wu, J. Rodriguez, M. A. Prez, and J. I. Leon Recent advances and industrial applications of multilevel converters. IEEE Trans. Pow. Electron., 57:2553-2580, Aug. 2010.
• Gultekin Design and implementation of a 154-kV, 50-Mvar transmission STATCOM based on 21-level cascaded multilevel converter. IEEE Trans. Ind. Appl., 48:3:1030-1045, May/Jun. 2012.