A Space Vector PWM Scheme for Multilevel Inverters Based on Two-Level Space Vector PWM
Gupta, A.K.
Khambadkone, A.M.
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct. 2006
Volume: 53,
Issue: 5
On page(s): 1631-1639
ISSN: 0278-0046
INSPEC Accession Number: 9167391
Digital Object Identifier: 10.1109/TIE.2006.881989
Current Version Published: 2006-10-02
Abstract
Multilevel inverters are increasingly being used in high-power medium voltage applications due to their superior performance compared to two-level inverters. Among various modulation techniques for a multilevel inverter, the space vector pulsewidth modulation (SVPWM) is widely used. However, the implementation of the SVPWM for a multilevel inverter is complicated. The complexity is due to the difficulty in determining the location of the reference vector, the calculation of on-times, and the determination and selection of switching states. This paper proposes a general SVPWM algorithm for multilevel inverters based on standard two-level SVPWM. Since the proposed multilevel SVPWM method uses two-level modulation to calculate the on-times, the computation of on-times for an n-level inverter becomes easier. The proposed method uses a simple mapping to achieve the SVPWM for a multilevel inverter. A general n-level implementation is explained, and experimental results are given for three-level and five-level inverters
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