Fault-Tolerant Control of CPS-PWM-Based Cascaded Multilevel Inverter with Faulty Units

Liansong Xiong, Fang Zhuo, Xiaokang Liu, Zhao Xu, Yixin Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


Bypassing the faulty power unit(s) of the regenerative cascaded multilevel inverter (CMI) directly results in a series of adverse influences. The existing solutions are not easy to implement and only effective for the Y-connected devices composed of regenerative CMIs. To bypass the faulty power units seamlessly, the corresponding control strategies must guarantee: 1) constant equivalent switching frequency; 2) constant sampling frequency; and 3) constant fundamental voltage amplitude. To this end, a generic fault-tolerant control strategy, which adjusts the carrier frequency and simultaneously changes the CMI dc voltage and/or the modulation ratio, is presented in this paper. It is applicable for the device composed of carrier phase-shifting pulsewidth modulation (CPS-PWM)-based CMIs to ride through faults seamlessly, whether it is a single-phase system, a three-phase system (being it δ -connected or Y-connected), or a multiphase system. The detailed implementation is also analyzed by modeling the output voltage of the CPS-PWM-based CMI. The experimental results verify the validity and superiority of the proposed fault-tolerant strategy for the CPS-PWM-based CMI system with faulty power units.

Original languageEnglish
Article number8640124
Pages (from-to)2486-2497
Number of pages12
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number4
Publication statusPublished - 12 Feb 2019


  • Carrier phase-shifting pulsewidth modulation (PWM)
  • fault-tolerant control
  • faulty power units
  • regenerative cascaded multilevel inverter (CMI)
  • static synchronous compensator (STATCOM)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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