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http://dx.doi.org/10.6113/JPE.2014.14.5.926

Simplified SVPWM that Integrates Overmodulation and Neutral Point Potential Control  

Zhu, Rong-Wu (Dept. of Information and Electrical Engineering, China University of Mining and Technology)
Wu, Xiao-Jie (Dept. of Information and Electrical Engineering, China University of Mining and Technology)
Publication Information
Journal of Power Electronics / v.14, no.5, 2014 , pp. 926-936 More about this Journal
Abstract
A simplified and effective space vector pulse-width modulation (SVPWM) algorithm with two and three levels for three-phase voltage-source converters is proposed in this study. The proposed SVPWM algorithm only uses several linear calculations on three-phase modulated voltages without any complicated trigonometric calculations adopted by conventional SVPWM. This simplified SVPWM also avoids choosing the vector sector required by conventional SVPWM. A two-level overmodulation scheme is integrated into the proposed two-level SVPMW to generate the output voltage that increases from a linear region to a six-step state with a smoothly linear transition characteristic and a simple overmodulation process without a lookup table and complicated nonlinear functions. The three-level SVPWM with a proportional-integral controller effectively balances the neutral point potential of the neutral point clamped converter. Results from the simulation in MATLAB/Simulink and the experiment based on a digital signal processor are provided to clearly demonstrate the validity and effectiveness of the proposed strategies.
Keywords
Asynchronous induction motor; Grid inverter; Neutral point potential; Overmodulation; Simplified SVPWM; Three-level converter; Two-level converter;
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