Open AccessOptimal space vector pulse width modulation strategy of neutral point clamped three‐level inverter for output current ripple reduction
Author(s) -
Chen Wei,
Dai Wenkai,
Wang Zhiqiang,
Zhang Guozheng,
Yan Yan,
Xia Changliang
Publication year - 2017
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2016.0544
Subject(s) - ripple , space vector , pulse width modulation , current (fluid) , reduction (mathematics) , control theory (sociology) , inverter , modulation (music) , point (geometry) , topology (electrical circuits) , mathematics , computer science , physics , engineering , voltage , electrical engineering , acoustics , geometry , artificial intelligence , control (management) , combinatorics
Based on the analysis of the space vector modulation strategies for three‐level inverters, the duration assignment of the two redundant switching states and the selection of different switching sequences can be considered as two degrees of freedom. The impacts of these two degrees of freedom on the quality of output current are evaluated by using the mathematical model of current ripple established in this study. Moreover, according to the principle of minimum rms value of output current ripple, the optimal assignment of the two redundant states and the optimal distribution of switching sequences are determined. Thus, the optimisation of the output current waveform is realised. The simulation and experimental results show that, for the proposed strategy, the total harmonic distortion (THD) of output current and the weighted THD of output voltage are both lower than that of the conventional strategies.