A Fault-Tolerant Control Strategy for Three-Level Grid-Connected NPC Inverters after Single-Arm Failure with Optimized SVPWM

Jingtao Huang (), Feng Bai, Qing Yang and Shiyi Ren
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Jingtao Huang: School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China
Feng Bai: School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China
Qing Yang: School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China
Shiyi Ren: School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China

Energies, 2023, vol. 16, issue 23, 1-16

Abstract: Three-level NPC inverters have been widely used in grid-connected systems due to their superior performance compared with two-level inverters, but more switches lead to high fault probability. Meanwhile, the neutral point potential (NPP) fluctuation of the DC link is an inherent problem of three-level NPC inverters. To keep the three-level NPC inverter running stably after single-arm failure, a fault-tolerant control strategy based on an optimised space vector pulse width modulation (SVPWM) is proposed in this paper. Firstly, the common-mode voltage (CMV) of the postfault three-level NPC inverter is analysed and then the preliminary synthesis principles of the reference voltage vector are determined. Then, in order to ensure the NPP balance and the quality of the grid-connected currents, the reference voltage vector synthesis rules are optimised, a low-pass filter (LPF) and a hysteresis comparator are designed, respectively, to ensure the quality of grid-connected currents and effectively decrease the DC link NPP deviation. Finally, the simulation results show that the proposed fault-tolerant control strategy can realize the stable and reliable operation of the grid-connected three-level NPC inverter after single-arm failure, and the CMV can be reduced significantly, the quality of grid-connected currents is also improved. The proposed fault-tolerant strategy also shows good performance when the grid-connected currents change.

Keywords: NPC inverter; fault-tolerant control; neutral point potential (NPP) fluctuation; SVPWM optimisation compensation; low pass filter; hysteresis comparator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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