A carrier-based PWM strategy with zero-sequence voltage injection for a three-level neutral-point-clamped converter

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URI: https://hdl.handle.net/11556/3699
ISSN: 0885-8993
DOI: 10.1109/TPEL.2010.2050783
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2012
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Abstract
Performance of a carrier-based pulsewidth modulation (CB-PWM) strategy can be improved by the inclusion of a zero-sequence voltage in the modulation-reference signal. This paper proposes a new CB-PWM strategy for a three-level neutral-point-clamped (NPC) converter, which is based on a zero-sequence voltage injection. By inclusion of the zero-sequence voltage, the sinusoidal-modulation reference is modified to 1) carry out the voltage-balancing task of the dc-link capacitors, with no additional control effort, 2) reduce the switching losses, and 3) reduce the low-frequency voltage oscillations of the neutral point. The proposed strategy is an alternative approach to the nearest three-vector (NTV) space-vector modulation (SVM) strategy and is obtained by the analysis of the NTV-SVM strategy and establishing a correlation between the NTV-SVM and the CB-PWM strategies. The salient features of the proposed scheme, as compared with the NTV-SVM strategy, are: 1) its reduced computational processing time which is attractive for digital implementation and 2) its reduced switching losses. Compared with the existing CB-PWM strategies, the proposed strategy offers 1) capability to balance the capacitor voltages and reduce the NP voltage oscillations and 2) reduced switching losses. Performance of the proposed CB-PWM strategy for a three-level NPC converter based on time-domain simulation studies in the MATLAB/SIMULINK environment is evaluated and also experimentally verified.
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Carrier-based pulsewidth modulation (CB-PWM) , space-vector modulation (SVM) strategy , three-level neutral-point-clamped (NPC) converter , Electrical and Electronic Engineering
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journal article
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Pou , J , Zaragoza , J , Ceballos , S , Saeedifard , M & Boroyevich , D 2012 , ' A carrier-based PWM strategy with zero-sequence voltage injection for a three-level neutral-point-clamped converter ' , IEEE Transactions on Power Electronics , vol. 27 , no. 2 , 5467188 , pp. 642-651 . https://doi.org/10.1109/TPEL.2010.2050783