Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction

This paper presents a sector subdivision based space vector pulse width modulation (SVPWM) strategy with reduced current ripple for a three-level inverter. Using the output current ripple theory, closed-form expressions of average current ripple vectors for both continuous and discontinuous switchin...

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Bibliographic Details
Published in:Energies (Basel) 2019, Vol.12 (14), p.2734
Main Authors: Zhang, Guozheng, Wei, Bingxu, Gu, Xin, Li, Xinmin, Zhou, Zhanqing, Chen, Wei
Format: Article
Language:English
Subjects:
current ripple
Fourier analysis
Fourier transforms
harmonic distortion
Inverters
Modularity
Pulse duration modulation
Ripples
space vector modulation
Strategy
Switching sequences
three-level inverter
Waveforms
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Summary:This paper presents a sector subdivision based space vector pulse width modulation (SVPWM) strategy with reduced current ripple for a three-level inverter. Using the output current ripple theory, closed-form expressions of average current ripple vectors for both continuous and discontinuous switching sequences are derived. Based on the sector and triangle distributions of conventional SVPWM strategy, each triangle is further divided into three small-regions. Then the switching sequence with the lowest magnitude of the average current ripple vector is applied in every small-region, so that the advantages of continuous pulse width modulation (CPWM) and discontinuous pulse width modulation (DPWM) under different modulation index conditions are combined to reduce the current ripple in the whole modulation range. The output performance of the proposed strategy is compared with the conventional CPWM and DPWM strategy, and experimental results verify that the proposed strategy could reduce the current ripple of three-level inverters effectively.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12142734