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http://dx.doi.org/10.6113/JPE.2016.16.6.2099

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

Wang, Yue (College of Electrical Engineering, Zhejiang University)
Hu, Yaowei (College of Electrical Engineering, Zhejiang University)
Chen, Guozhu (College of Electrical Engineering, Zhejiang University)
Publication Information
Journal of Power Electronics / v.16, no.6, 2016 , pp. 2099-2108 More about this Journal
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.
Keywords
Cascaded multilevel converter; Cascaded SVG; CPS-SPWM; DC-link voltage balancing control; T-type H-bridge; virtual five-level;
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Times Cited By KSCI : 2  (Citation Analysis)
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