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Abstract
The paper proposes a novel balancing algorithm of neutral-point (NP) potential for the three-level NP-clamped inverters, which is based on appropriate zero-sequence voltage injection. The relationship between the NP average current and zero-sequence voltage injected is studied comprehensively. The NP average current injection allowance for controlling NP potential are derived. The theoretical optimum zero-sequence voltage for controlling NP potential is obtained by the relationship. Simulation and experimental results verify validity and practicability of the algorithm.
Additional information
Notes on contributors
Y. Wang
Yingjie Wang received his BEng degree in mechanical engineering and automation from the Central South University, Hunan, China, in 2001. He is currently working toward his PhD degree in Power Electronics and Power Drives from China University of Mining and Technology. He is involved in research projects in single-stage photovoltaic grid-connected inverters. His research interests include design, control and analysis of power inverters, especially in high-power fields.
X. Wu
Xiaojie Wu received his MS and PhD degrees in Power Electronics and Power Drives from China University of Mining and Technology (CUMT), China, in 1991 and 2000, respectively. From 2002 to 2004, he was a Postdoctoral Research Fellow in the Department of Electrical Engineering, Tsinghua University. Since 2005, he has been a Professor at the School of Information and Electrical Engineering, CUMT. His research interests include motor control and protection, high-voltage and high-power inverter for motor drives, and active power filter application.
P. Dai
Peng Dai received his MS and PhD degrees in Power Electronics and Power Drives from China University of Mining and Technology (CUMT), China, in 1998 and 2006, respectively. He is currently an Associate Professor at the School of Information and Electrical Engineering, CUMT. His research interests include control theories and applications of high-power AC motors and multilevel converters control.
J. Zhou
Juan Zhou received her MASc degree in Power Electronics and Power Drives from China University of Mining and Technology, China, in 2004, where she is currently working toward her PhD degree. She is currently an Associate Professor and engages in power electronics research and teaching. Her research interests include power inverter topologies and digital control for active power filters.