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http://dx.doi.org/10.6113/JPE.2015.15.5.1207

A New DPWM Method to Suppress the Low Frequency Oscillation of the Neutral-Point Voltage for NPC Three-Level Inverters  

Lyu, Jianguo (School of Energy and Power Engineering, Nanjing University of Science and Technology)
Hu, Wenbin (School of Automation, Nanjing University of Science and Technology)
Wu, Fuyun (College of Electrical and Automatic 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.15, no.5, 2015 , pp. 1207-1216 More about this Journal
Abstract
In order to suppress the low frequency oscillation of the neutral-point voltage for three-level inverters, this paper proposes a new discontinuous pulse width modulation (DPWM) control method. The conventional sinusoidal pulse width modulation (SPWM) control has no effect on balancing the neutral-point voltage. Based on the basic control principle of DPWM, the relationship between the reference space voltage vector and the neutral-point current is analyzed. The proposed method suppresses the low frequency oscillation of the neutral-point voltage by keeping the switches of a certain phase no switching in one carrier cycle. So the operating time of the positive and negative small vectors is equal. Comparing with the conventional SPWM control method, the proposed DPWM control method suppresses the low frequency oscillation of the neutral-point voltage, decreases the output waveform harmonics, and increases both the output waveform quality and the system efficiency. An experiment has been realized by a neutral-point clamped (NPC) three-level inverter prototype based on STM32F407-CPLD. The experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed DPWM method.
Keywords
Discontinuous pulse width modulation (DPWM); Low frequency oscillation; Neutral-point voltage balancing; Three-level inverter;
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