Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Balancing control scheme of DC-link capacitor voltages for five-level hybrid T-type inverters without auxiliary circuit

  • Min‑Seok Kim (Department of Electrical Engineering, Yeungnam University) ;
  • Dong‑Choon Lee (Department of Electrical Engineering, Yeungnam University)
  • Received : 2022.09.29
  • Accepted : 2023.01.08
  • Published : 2023.03.20
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Abstract

In this paper, a balancing control scheme of DC-link capacitor voltages for five-level hybrid T-type (5L-HT) inverters is proposed, where existing auxiliary balancing circuit is eliminated. The 5L-HT inverter has a significant advantage of the reduced number of devices compared with other five-level inverter topologies. However, this inverter requires an auxiliary balancing circuit, which is used to rectify the voltage imbalance at the DC-link capacitors, and thus negates the competitiveness of this topology in terms of device count and converter volume. To eliminate the auxiliary circuit, a carrier-overlapped PWM (COPWM) is applied in place of the conventional level-shifted PWM (LSPWM) to control the neutral-point currents, where the duty ratios of switches are adjusted by PI controllers. As a result, although the THD of the output voltage is rather increased, the cost and volume are saved by 27% and 52%, respectively, for a 1-MW/6.6-kV system. The effectiveness of the proposed balancing control method for the 5L-HT inverter has been verified through the simulation and experimental results for the prototype hardware.

Keywords

Acknowledgement

This research was supported by the Yeungnam University Research Grants in 2020.

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