Fault detection and tolerant control for flying‑capacitor modular multilevel converters feeding induction motor drives

Duc Dung Le; Sihyeong Hong; Dong-Choon Lee

Fault detection and tolerant control for flying‑capacitor modular multilevel converters feeding induction motor drives

Duc Dung Le

Sihyeong Hong

Dong-Choon Lee

Vol. 22, No. 6, pp. 947-958, Jun. 2022

10.1007/s43236-022-00425-x

Current sensor

Fault detection

Fault-tolerant control

Medium-voltage motor drive

Modular multilevel converter (MMC)

Abstract

In this paper, an IGBT open-circuit fault detection and fault-tolerant control strategy are proposed for a fl ying-capacitor modular multilevel converter (FC-MMC) feeding induction motor drives. Fault occurrence is detected by monitoring the sum of measured AC-circulating currents. In the fault case, the phase with the faulty device is identifi ed through the errors between the measured and estimated output currents of the converter. In this phase, then, a localization of a faulty submodule (SM) is performed by investigating the SM capacitor voltages. Thereafter, the fault-tolerant control method is applied to reconfi gure the converter structure, where the faulty SM is isolated and the converter can operate as normal. In addition, an SM capacitor voltage-balancing control scheme is proposed, where the number of current sensors is reduced to six from nine. Therefore, the system cost is lowered, and the communication burden is lightened. The viability of the proposed control scheme is confi rmed by experimental results for an FC-MMC-fed induction motor drive system.

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Cite this article

[IEEE Style]

D. D. Le, S. Hong, D. Lee, "Fault detection and tolerant control for flying‑capacitor modular multilevel converters feeding induction motor drives," Journal of Power Electronics, vol. 22, no. 6, pp. 947-958, 2022. DOI: 10.1007/s43236-022-00425-x.

[ACM Style]

Duc Dung Le, Sihyeong Hong, and Dong-Choon Lee. 2022. Fault detection and tolerant control for flying‑capacitor modular multilevel converters feeding induction motor drives. Journal of Power Electronics, 22, 6, (2022), 947-958. DOI: 10.1007/s43236-022-00425-x.