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Energies 2017, 10(5), 725; doi:10.3390/en10050725

A Switching Frequency Optimized Space Vector Pulse Width Modulation (SVPWM) Scheme for Cascaded Multilevel Inverters

1
School of Automation, Guangdong University of Technology, Guangzhou 510006, China
2
School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 21 March 2017 / Revised: 3 May 2017 / Accepted: 12 May 2017 / Published: 21 May 2017
(This article belongs to the Section Energy Fundamentals and Conversion)

Abstract

This paper presents a novel switching frequency optimized space vector pulse width modulation (SVPWM) scheme for cascaded multilevel inverters. The proposed SVPWM is developed in a α′β′ coordinate system, in which the voltage vectors have only integer entries and the absolute increment of coordinate values between adjacent vectors is equal to dc-bus voltage of power cells (1 pu). The new SVPWM scheme is built with three categories of switching paths. During each switching path, the change of one phase voltage is limited in 1 pu. This contributes to decrease the number of commutations of switches. The proposed SVPWM scheme is validated on a 7-level cascaded inverter and the results show that it significantly outperforms traditional SVPWM schemes in terms of decreasing the number of switch commutations. View Full-Text
Keywords: space vector pulse width modulation (SVPWM); switching frequency optimized; cascaded multilevel inverter; switching path planning space vector pulse width modulation (SVPWM); switching frequency optimized; cascaded multilevel inverter; switching path planning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tang, X.; Zhang, J.; Liu, Z.; Zhang, M. A Switching Frequency Optimized Space Vector Pulse Width Modulation (SVPWM) Scheme for Cascaded Multilevel Inverters. Energies 2017, 10, 725.

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