A Novel Modulation Method for Three-Level Inverter Neutral Point Potential Oscillation Elimination

Yuan Yao; Longyun Kang; Zhi Zhang

A Novel Modulation Method for Three-Level Inverter Neutral Point Potential Oscillation Elimination

Yuan Yao

Longyun Kang

Zhi Zhang

Vol. 18, No. 2, pp. 445-455, Mar. 2018

10.6113/JPE.2018.18.2.445

Finite-control-set model predictive control

Neutral point clamped three-level inverter

Neutral point potential oscillations

Virtual vector

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Abstract

A novel algorithm is proposed to regulate the neutral point potential in neutral point clamped three-level inverters. Oscillations of the neutral point potential and an unbalanced dc-link voltage cause distortions of the output voltage. Large capacitors, which make the application costly and bulky, are needed to eliminate oscillations. Thus, the algorithm proposed in this paper utilizes the finite-control-set model predictive control and the multistage medium vector to solve these issues. The proposed strategy consists of a two-step prediction and a cost function to evaluate the selected multistage medium vector. Unlike the virtual vector method, the multistage medium vector is a mixture of the virtual vector and the original vector. In addition, its amplitude is variable. The neutral point current generated by it can be used to adjust the neutral point potential. When compared with the virtual vector method, the multistage medium vector contributes to decreasing the regulation time when the modulation index is high. The vectors are rearranged to cope with the variable switching frequency of the model predictive control. Simulation and experimental results verify the validity of the proposed strategy.

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Cite this article

[IEEE Style]

Y. Yao, L. Kang, Z. Zhang, "A Novel Modulation Method for Three-Level Inverter Neutral Point Potential Oscillation Elimination," Journal of Power Electronics, vol. 18, no. 2, pp. 445-455, 2018. DOI: 10.6113/JPE.2018.18.2.445.

[ACM Style]

Yuan Yao, Longyun Kang, and Zhi Zhang. 2018. A Novel Modulation Method for Three-Level Inverter Neutral Point Potential Oscillation Elimination. Journal of Power Electronics, 18, 2, (2018), 445-455. DOI: 10.6113/JPE.2018.18.2.445.