Abstract
The new 6-switch single-phase 5-level current-source inverter proposed in this paper was developed by properly simplifying the traditional 8-switch single-phase 5-level current-source inverter, and its operational principle was analyzed. Just like the problem of voltage-unbalance between different levels existing in voltage-source multilevel inverters, a similar problem of current-unbalance between different levels whether for the 8-switch single-phase 5-level current-source inverter, or for the new 6-switch 5-level current-source inverter also exists. A simple current-balance control method via DC current feedback is presented here to implement the current-balance control between different levels. And to reduce the output current harmonics, PWM control technique was used. Simulation and experimental results showed that this new 6-switch topology operates correctly and that the balance-inductor can almost equally distribute the total DC current.
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Project (No. 50477033) supported by the National Natural Science Foundation of China
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Bao, Jy., Li, Yl. & Zhang, Zc. A 6-switch single-phase 5-level current-source inverter. J. Zhejiang Univ. - Sci. A 7, 1051–1055 (2006). https://doi.org/10.1631/jzus.2006.A1051
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DOI: https://doi.org/10.1631/jzus.2006.A1051