Fault Diagnosis Method for Sub-module of Modular Multilevel Converter

Zhengxi Gu

《International Core Journal of Engineering》 7卷3期 (2021/03) Pp. 337-349

https://doi.org/10.6919/ICJE.202103_7(3).0046

摘要

The reliability of modular multilevel converter (MMC) is the premise to ensure the stable operation of the whole system. Therefore, when the fault occurs on the sub-module (SM), it is necessary to detect and locate it quickly and accurately to avoid the shutdown of the whole system. Based on the analysis of the open-circuit fault characteristics of the SM, a fault detection strategy of MMC power switch based on logic operation is proposed in this paper. The algorithm detects and locates the open-circuit fault according to the inconsistency between the binary output signal of the SM terminal voltage and the trigger signal of SM upper switch. Finally, the MMC simulation system is built in MATLAB/Simulink, and the results show that the proposed strategy can effectively reduce the calculation amount of fault diagnosis. It also can detect and locate IGBT open-circuit fault quickly and accurately. This method is simple to implement and does not need additional voltage measuring equipment.

關鍵字

Modular Multilevel Converter ； Sub-Module ； Fault Diagnosis ； Logic Operation

參考文獻

A. Lesnicar and R. Marquardt, "An innovative modular multilevel converter topolo-gy suitable for a wide power range," 2003 IEEE Bologna Power Tech Conference Proceedings, Bologna, Italy, 2003, pp. 6 pp. Vol.3-, doi: 10.1109/PTC.2003.1304403.

D. Ronanki and S. S. Williamson, "Modular Multilevel Converters for Transporta-tion Electrification: Challenges and Opportunities," in IEEE Transactions on Trans-portation Electrification, vol. 4, no. 2, pp. 399-407, June 2018, doi: 10.1109/TTE.2018.2792330.

S. Debnath, J. Qin, B. Bahrani, M. Saeedifard and P. Barbosa, "Operation, Control, and Applications of the Modular Multilevel Converter: A Review," in IEEE Transac-tions on Power Electronics, vol. 30, no. 1, pp. 37-53, Jan. 2015, doi:10.1109/TPEL.2014.2309937.

F. Deng, Y. Lü, C. Liu, Q. Heng, Q. Yu and J. Zhao, "Overview on submodule topolo-gies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters," in Chinese Journal of Electrical Engi-neering, vol. 6, no. 1, pp. 1-21, March 2020, doi: 10.23919/ CJEE.2020.000001.

U. Choi, F. Blaabjerg and K. Lee, "Study and Handling Methods of Power IGBT Module Failures in Power Electronic Converter Systems," in IEEE Transactions on Power Electronics, vol. 30, no. 5, pp. 2517-2533, May 2015, doi:10.1109/TPEL.2014.2373390.