DC-Link Voltage Balance Control Using Fourth- Phase for 3-Phase 3-Level NPC PWM Converters with Common-Mode Voltage Reduction Technique

Jun-Hyung Jung; Jung-Hoon Park; Jang-Mok Kim; Yung-Deug Son

DC-Link Voltage Balance Control Using Fourth- Phase for 3-Phase 3-Level NPC PWM Converters with Common-Mode Voltage Reduction Technique

Vol. 19, No. 1, pp. 108-118, Jan. 2019

10.6113/JPE.2019.19.1.108

Common-mode voltage reduction

DC-link voltage balancing control

Three-level NPC converter

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Abstract

This paper proposes a DC-link voltage balance controller using the fourth-phase of a three-level neutral-point clamped (NPC) PWM converter with medium vector selection (MVS) PWM for common-mode voltage reduction. MVS PWM makes the voltage reference by synthesizing the voltage vectors that cannot generate common-mode voltage. This PWM method is effective for reducing the EMI noise emitted from converter systems. However, the DC-link voltage imbalance problem is caused by the use of limited voltage vectors. Therefore, in this paper, the effect of MVS PWM on the DC-link voltage of a three-level NPC converter is analyzed. Then a proportional-derivative (PD) controller for the DC-link voltage balance is designed from the DC-link modeling. In addition, feedforward compensation of the neutral point current is included in the proposed PD controller. The effectiveness of the proposed controller is verified by experimental results.

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Cite this article

[IEEE Style]

J. Jung, J. Park, J. Kim, Y. Son, "DC-Link Voltage Balance Control Using Fourth- Phase for 3-Phase 3-Level NPC PWM Converters with Common-Mode Voltage Reduction Technique," Journal of Power Electronics, vol. 19, no. 1, pp. 108-118, 2019. DOI: 10.6113/JPE.2019.19.1.108.

[ACM Style]

Jun-Hyung Jung, Jung-Hoon Park, Jang-Mok Kim, and Yung-Deug Son. 2019. DC-Link Voltage Balance Control Using Fourth- Phase for 3-Phase 3-Level NPC PWM Converters with Common-Mode Voltage Reduction Technique. Journal of Power Electronics, 19, 1, (2019), 108-118. DOI: 10.6113/JPE.2019.19.1.108.