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http://dx.doi.org/10.6113/JPE.2019.19.1.99

DC-Link Capacitor Voltage Balanced Modulation Strategy Based on Three-Level Neutral-Point-Clamped Cascaded Rectifiers  

Han, Pengcheng (School of Electrical Engineering, Southwest Jiaotong University)
He, Xiaoqiong (School of Electrical Engineering, Southwest Jiaotong University)
Zhao, Zhiqin (School of Electrical Engineering, Southwest Jiaotong University)
Yu, Haolun (School of Electrical Engineering, Southwest Jiaotong University)
Wang, Yi (School of Electrical Engineering, Southwest Jiaotong University)
Peng, Xu (Civil Aviation Flight University of China)
Shu, Zeliang (School of Electrical Engineering, Southwest Jiaotong University)
Publication Information
Journal of Power Electronics / v.19, no.1, 2019 , pp. 99-107 More about this Journal
Abstract
This study proposes a new modulation strategy to deal with unbalanced output voltage that is based on three-level neutral-point-clamped cascaded rectifiers. The fundament idea is to reallocate the value of the voltage levels generated by each of the modules on the basis of space vector pulse width modulation. This proposed modulation strategy can reduce the switching frequency while maintaining the mutual-module voltage balance. First, an analysis of unbalanced output voltage is reflected. Then a new modulation strategy is introduced in detail. Internal module capacitor voltages are balanced by the selection of redundant vectors. Moreover, the voltage balance ability is calculated. Finally, the feasibility of this modulation strategy is verified through experimental results.
Keywords
Balance region calculation; Cascaded rectifier; Neutral-point-clamped; Voltage balanced modulation;
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