A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters

Jianguo Lyu; Wenbin Hu; Fuyun Wu; Kai Yao; Junji Wu

A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters

Vol. 16, No. 6, pp. 2109-2118, Nov. 2016

10.6113/JPE.2016.16.6.2109

Neutral-point voltage balance

Output harmonics

Space vector pulse width modulation (SVPWM)

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Abstract

Based on the space vector pulse width modulation (SVPWM) theory, this paper realizes an easier SVPWM strategy, which is equivalently implemented by CBSPWM with zero-sequence voltage injection. The traditional SVPWM strategy has no effect on controlling the neutral-point voltage balance. In order to solve the neutral-point voltage unbalance problem for neutral-point-clamped (NPC) three-level inverters, this paper proposes a neutral-point voltage balance controller. The proposed controller realizes controlling the neutral-point voltage balance by dynamically calculating the offset superimposed to the three-phase modulation waves of an equivalent SVPWM strategy. Compared with the traditional SVPWM strategy, the proposed neutral-point voltage balance controller has a strong ability to balance the neutral-point voltage, has good steady-state performance, improves the output waveforms quality and is easy for digital implementation. An experiment has been carried out on a NPC three-level inverter prototype based on a digital signal processor-complex programmable logic device (DSP-CPLD). The obtained experimental results verify the effectiveness of the proposed neutral-point voltage balance controller.

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Cite this article

[IEEE Style]

J. Lyu, W. Hu, F. Wu, K. Yao, J. Wu, "A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters," Journal of Power Electronics, vol. 16, no. 6, pp. 2109-2118, 2016. DOI: 10.6113/JPE.2016.16.6.2109.

[ACM Style]

Jianguo Lyu, Wenbin Hu, Fuyun Wu, Kai Yao, and Junji Wu. 2016. A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters. Journal of Power Electronics, 16, 6, (2016), 2109-2118. DOI: 10.6113/JPE.2016.16.6.2109.