A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters

Sixing Du; Jinjun Liu; Teng Liu

A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters

Sixing Du

Jinjun Liu

Teng Liu

Vol. 15, No. 3, pp. 660-669, May 2015

10.6113/JPE.2015.15.3.660

DC voltage control

MMC

PWM

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Abstract

This paper presents a control scheme with a focus on the combination of phase disposition pulse width modulation (PDPWM) and DC capacitor voltage control for a chopper-cell based modular multilevel converter (MMC) for the purpose of eliminating the time-consuming voltage sorting algorithm and complex voltage balancing regulators. In this paper, the convergence of the DC capacitor voltages within one arm is realized by charging the minimum voltage module and discharging the maximum voltage module during each switching cycle with the assistances of MAX/MIN capacitor voltage detection and PDPWM signals exchanging. The process of voltage balancing control introduces no extra switching commutation, which is helpful in reducing power loss and improving system efficiency. Additionally, the proposed control scheme also possess the merit of a simple executing procedure in application. Simulation and experimental results indicates that the MMC circuit together with the proposed method functions very well in balancing the DC capacitor voltage and improving system efficiency even under transient states.

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Cite this article

[IEEE Style]

S. Du, J. Liu, T. Liu, "A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters," Journal of Power Electronics, vol. 15, no. 3, pp. 660-669, 2015. DOI: 10.6113/JPE.2015.15.3.660.

[ACM Style]

Sixing Du, Jinjun Liu, and Teng Liu. 2015. A PDPWM Based DC Capacitor Voltage Control Method for Modular Multilevel Converters. Journal of Power Electronics, 15, 3, (2015), 660-669. DOI: 10.6113/JPE.2015.15.3.660.