Three‑level boost inverter with capacitor voltage self‑balancing and high conversion efficiency for low DC voltage systems

Currently, Z-source networks are widely employed to extend the output-voltage range of inverters operating at a low voltage DC source. However, these inverters are troubled by low power-conversion efficiency and an obvious current distortion due to the copper losses and core losses of the inductors. In addition, they have limited voltage levels. In this paper, a novel boost network composed of two power switches, two capacitors, and two diodes is proposed to overcome these shortcomings. Meanwhile, a corresponding modulation strategy is also set forth to achieve capacitor voltage self-balancing and to regulate the output AC voltage. Moreover, by adding more switched-capacitor cells, the range of the output voltage can be further improved, and the max DC/AC-voltage conversion ratio of the inverter with n cells is √3( n + 1)/3. At last, an inverter prototype with a 1 kW power rating is built, and the obtained results demonstrate that this inverter possesses the following superiorities: a wider range of output voltage, automatic balancing of the capacitor voltage, less current distortion, and high-efficiency power conversion.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

B. Hu, Z. Tang, Z. Zhang, J. Linghu, J. Qian, X. Qin, B. Meng, R. Han, "Three‑level boost inverter with capacitor voltage self‑balancing and high conversion efficiency for low DC voltage systems," Journal of Power Electronics, vol. 23, no. 12, pp. 1820-1832, 2023. DOI: 10.1007/s43236-023-00677-1.

[ACM Style]

Bihua Hu, Zhaohong Tang, Zhi Zhang, Jinqing Linghu, Jihong Qian, Xiangyun Qin, Bumin Meng, and Rong Han. 2023. Three‑level boost inverter with capacitor voltage self‑balancing and high conversion efficiency for low DC voltage systems. Journal of Power Electronics, 23, 12, (2023), 1820-1832. DOI: 10.1007/s43236-023-00677-1.