A Single-Phase Transformerless Nine-Level Inverter and Its Control Strategy

Yuan Li, Wenwen Huang, Zhen Li, Yue Sun and Bi Liu
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Yuan Li: School of Electronic and Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, China
Wenwen Huang: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Zhen Li: School of Electrical Engineering, Shandong University, Jinan 250061, China
Yue Sun: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Bi Liu: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China

Energies, 2022, vol. 15, issue 9, 1-17

Abstract: To reduce the device number per unit level of the existing nine-level inverters, a topology of single-phase transformerless nine-level inverter was proposed. The proposed topology consists of only 10 switching devices and 4 capacitors. Firstly, the working principle of the proposed topology was analyzed in detail, and the comparison with conventional nine-level topologies in terms of device switching loss and conduction loss was presented. Then, combined with one-dimensional space vector modulation, a floating capacitor voltage estimation method was presented by the analysis of the operation mode before the arrival of redundant switching state. On this basis, a floating capacitor voltage sensorless control scheme was proposed, to achieve the balance of the floating capacitor voltages. Finally, simulations and experiments verified the effectiveness and correctness of the proposed topology and floating capacitor voltage sensorless control method.

Keywords: nine-level inverter; one-dimensional space vector modulation; floating capacitor voltage estimation; voltage balancing control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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