Improved virtual SVPWM algorithm for CMV reduction and NPV oscillation elimination in Three-Level NPC inverter

Liu, Zhan; Zhang, Wenming; Li, Congjian; Wang, Xu; Qin, Haipeng

doi:10.1016/j.ijepes.2023.109533

Cited by 1 publication

(1 citation statement)

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“…For three-level NPC inverters, the virtual voltage vector pulse width modulation technique (VSVPWM) is utilized to synthesize the virtual vector to restrain the fluctuation of the NPP. In [15,16], the distribution coefficients of each basic vector in the virtual vector are recalculated to suppress the fluctuation of the NPP. However, the space voltage vectors of ESTPI no longer contain redundant voltage vectors [17], therefore the multi-vector method of suppressing NPP fluctuation is limited.…”

Section: Introductionmentioning

confidence: 99%

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

Huang,

Bai,

Yang

et al. 2023

Energies

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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.

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Section: Introductionmentioning

confidence: 99%