A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters

Yue Wang; Yaowei Hu; Guozhu Chen

A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters

Yue Wang

Yaowei Hu

Guozhu Chen

Vol. 16, No. 6, pp. 2099-2108, Nov. 2016

10.6113/JPE.2016.16.6.2099

Cascaded multilevel converter

Cascaded SVG

CPS-SPWM

DC-link voltage balancing control

T-type H-bridge

virtual five-level

PDF

Abstract

The cascaded multilevel converter is widely adopted to medium/high voltage and high power electronic applications due to the small harmonic components of the output voltage and the facilitation of modularity. In this paper, the operation principle of a T-type H-bridge topology is investigated in detail, and a carrier phase shifted pulse width modulation (CPS-PWM) based control method is proposed for this topology. Taking a virtual five-level waveform achieved by a unipolar double frequency CPS-PWM as the output object, PWM signals of the T-type H-bridge can be obtained by reverse derivation according to its switching modes. In addition, a control method for the T-type H-bridge based cascaded multilevel converter is introduced. Then a single-phase T-type H-bridge cascaded multilevel static var generator (SVG) prototype is built, and a repetitive controller based compound current control strategy is designed with the DC-link voltage balancing control scheme analyzed. Finally, simulation and experimental results validate the correctness and feasibility of the proposed modulation method and control strategy for T-type H-bridge based cascaded multilevel converters.

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Cite this article

[IEEE Style]

Y. Wang, Y. Hu, G. Chen, "A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters," Journal of Power Electronics, vol. 16, no. 6, pp. 2099-2108, 2016. DOI: 10.6113/JPE.2016.16.6.2099.

[ACM Style]

Yue Wang, Yaowei Hu, and Guozhu Chen. 2016. A Novel Modulation Scheme and a DC-Link Voltage Balancing Control Strategy for T-Type H-Bridge Cascaded Multilevel Converters. Journal of Power Electronics, 16, 6, (2016), 2099-2108. DOI: 10.6113/JPE.2016.16.6.2099.