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http://dx.doi.org/10.6113/JPE.2016.16.6.2109

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

Lyu, Jianguo (School of Automation, Nanjing University of Science and Technology)
Hu, Wenbin (School of Automation, Nanjing University of Science and Technology)
Wu, Fuyun (College of Mechanical and Electrical Engineering, Sanjiang University)
Yao, Kai (School of Automation, Nanjing University of Science and Technology)
Wu, Junji (School of Energy and Power Engineering, Nanjing University of Science and Technology)
Publication Information
Journal of Power Electronics / v.16, no.6, 2016 , pp. 2109-2118 More about this Journal
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.
Keywords
Neutral-point voltage balance; Output harmonics; Space vector pulse width modulation (SVPWM);
Citations & Related Records
Times Cited By KSCI : 11  (Citation Analysis)
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