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A new three-phase 5-level current-source inverter

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第12期7卷 1973-1978页

作者： BAO Jian-yu BAI Zhi-hong WANG Qing-song ZHANG Zhong-chao School of Electrical Engineering Zhejiang University Hangzhou 310027 China

The new three-phase 5-level current-source inverter (CSI) proposed in this paper was developed by connecting three separate single-phase 5-level CSIs in series, and its operational principle was analyzed. There are two major problems existing in current-source multilevel inverters, one is the complex PWM control method (2-logic to 3-logic conversion), and the other is the problem of current-unbalance between different levels. A simple current-balance control method via DC current feedback is applied in each single-phase 5-level CSI cell to implement the current-balance control between different levels. And to reduce the output current harmonics, POD PWM control technique was used. Simulation and experimental results showed that this new three-phase 5-level CSI topology operates correctly.

关键词： Three-phase Current-source inverter (CSI) 5-level Harmonics POD PWM

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New Multilevel Mixed Topology Development to Improve Inverter Robustness for Domestic Photovoltaic Installations

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Journal of Power and Energy Engineering 2013年第5期1卷 1-6页

作者： Sébastien Jacques Adelphe Caldeira Ambroise Schellmanns Zheng Ren Nathalie Batut GREMAN UMR-CNRS 7347 University of Tours 7 Avenue Marcel Dassault 37200 Tours France.

Multilevel inverters are well used in grid connected domestic photovoltaic applications because of their ability to generate a very good quality of waveforms, reducing switching frequency, and their low voltage stress across the power devices. However, this kind of inverter has to be modified to both limit common-mode currents and improve the robustness of the system. This paper presents a new mixed 5-level inverter that meets these challenges. The operating principle of the converter is proposed. Several experimental measurements are described to validate this new concept. The output voltage and current and the THD of the output voltage are particularly discussed.

关键词： Domestic PV Applications Common Mode Currents Decoupling Capacitances Mixed 5-level Inverter

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