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자료유형
학술저널
저자정보
Bo Guan (Chongqing University) Shinji Doki (Nagoya University)
저널정보
전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.19 No.1
발행연도
2019.1
수록면
119 - 133 (15page)

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Although the dual modulation wave method can solve the low-frequency neutral point potential (NPP) fluctuation problem for three-level neutral point clamped converters, it also increases the switching frequency and limits the zero-sequence voltage. That makes it harmful when dealing with the NPP drift problem if the converter suffers from a long dead time or asymmetric loads. By introducing two degrees of freedom (2-DOF), an NPP control based on a search optimization method can demonstrate its ability to cope with the above mentioned two types of NPP problems. However, the amount of calculations for obtaining an optimal 2-DOF is so large that the method cannot be applied to certain industrial applications with an inexpensive digital signal processor. In this paper, a novel optimal 2-DOF-based NPP control is proposed. The relationships between the NPP and the 2-DOF are analyzed and a method for directly determining the optimal 2-DOF is also discussed. Using a direct calculation method, the amount of calculations is significantly reduced. In addition, the proposed method is able to maintain the strongest control ability for the two types of NPP problems. Finally, some experimental results are given to confirm the validity and feasibility of the proposed method.

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Abstract
Ⅰ. INTRODUCTION
Ⅱ. SOME CONVENTIONAL NPP CONTROL METHODS AND THEIR DISADVANTAGES
Ⅲ. OPTIMAL 2-DOF BASED NPP CONTROL FOR TL-NPC CONVERTERS
Ⅳ. EXPERIMENTAL VERIFICATION
Ⅴ. CONCLUSIONS
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