Discontinuous PWM Scheme for Switching Losses Reduction in Modular Multilevel Converters

Min-Gyo Jeong; Seok-Min Kim; June-Seok Lee; Kyo-Beum Lee

Discontinuous PWM Scheme for Switching Losses Reduction in Modular Multilevel Converters

Vol. 17, No. 6, pp. 1490-1499, Nov. 2017

10.6113/JPE.2019.17.6.1490

Discontinuous PWM

Modular multilevel converter

Switching losses

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Abstract

The modular multilevel converter (MMC) is generally considered to be a promising topology for medium-voltage and high-voltage applications. However, in order to apply it to high-power applications, a huge number of switching devices is essential. The numerous switching devices lead to considerable switching losses, high cost and a larger heat sink for each of the switching device. In order to reduce the switching losses of a MMC, this paper analyzes the performance of the conventional discontinuous pulse-width modulation (DPWM) method and its efficiency. In addition, it proposes a modified novel DPWM method for advanced switching losses reduction. The novel DPWM scheme includes an additional rotation method for voltage-balancing and power distribution among sub modules (SMs). Simulation and experimental results verify the effectiveness and performance of the proposed modulation method in terms of its switching losses reduction capability.

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Cite this article

[IEEE Style]

M. Jeong, S. Kim, J. Lee, K. Lee, "Discontinuous PWM Scheme for Switching Losses Reduction in Modular Multilevel Converters," Journal of Power Electronics, vol. 17, no. 6, pp. 1490-1499, 2017. DOI: 10.6113/JPE.2019.17.6.1490.

[ACM Style]

Min-Gyo Jeong, Seok-Min Kim, June-Seok Lee, and Kyo-Beum Lee. 2017. Discontinuous PWM Scheme for Switching Losses Reduction in Modular Multilevel Converters. Journal of Power Electronics, 17, 6, (2017), 1490-1499. DOI: 10.6113/JPE.2019.17.6.1490.