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JPE, Vol. 19, No. 1, January 2019
DC-Link Capacitor Voltage Balanced Modulation Strategy Based on Three-Level Neutral-Point-Clamped Cascaded Rectifiers
Pengcheng Han, Xiaoqiong He, Zhiqin Zhao, Haolun Yu, Yi Wang, Xu Peng, and Zeliang Shu
Area High Power Converters
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.
Keyword Balance region calculation,Cascaded rectifier,Neutral-point-clamped,Voltage balanced modulation
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