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Han, Pengcheng,He, Xiaoqiong,Zhao, Zhiqin,Yu, Haolun,Wang, Yi,Peng, Xu,Shu, Zeliang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
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.
Pengcheng Han,Xiaoqiong He,Zhiqin Zhao,Haolun Yu,Yi Wang,Xu Peng,Zeliang Shu 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
This study proposes a new modulation strategy to deal with unbalanced output voltage that is based on three-levelneutral-point-clamped cascaded rectifiers. The fundament idea is to reallocate the value of the voltage levels generated by each ofthe modules on the basis of space vector pulse width modulation. This proposed modulation strategy can reduce the switchingfrequency 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 ofredundant vectors. Moreover, the voltage balance ability is calculated. Finally, the feasibility of this modulation strategy isverified through experimental results.