A Nine-Level T-Type Packed U-Cell Inverter

 ABSTRACT:

This letter proposes a novel nine-level T-type packed U-cell (9L-TPUC) inverter, which consists of one T-type neutral point clamped leg, one half-bridge, two switches and two identical dc sources. And the single carrier modulation scheme can easily produce the corresponding switching sequences, which makes the T-type leg switching under high frequency and other switches operating under low frequency. To further improve the operational efficiency, the T-type leg can be constructed by using SiC devices for withstanding the necessary high frequency switching. The experimental results verified the performance of the proposed topology.1

KEYWORDS:

1.      Packed U-Cell Inverter

2.      Nine-level converter

3.      Single carrier modulation

4.      SiC switch

SOFTWARE: MATLAB/SIMULINK

CONCLUSION:

 This letter proposes a compact nine-level T-type packed U-cell inverter. Compared with other nine-level inverters, the proposed topology has fewer power semiconductor devices and only needs two isolated dc sources. Furthermore, the proposed PWM scheme only uses one carrier, which can reduce the design and control complexity. Since the T-type leg will generate the high frequency switching waveform, it can be replaced by SiC MOSFETs for significantly reducing switching losses. Experimental results verified the performance of the proposed multilevel topology.

REFERENCES:

 

[1] K. K. Gupta, A. Ranjan, P. Bhatnagar, L. Kumar Sahu, and S. Jain, “Multilevel inverter topologies with reduced device count: A review,” IEEE Trans. Power Electron., vol. 31, no. 1, pp. 135–151, Jan. 2016.

 

[2] J. Rodriguez, S. Bernet, B. Wu, J. O. Pontt, and S. Kouro, “Multilevel voltage-source-inverter topologies for industrial medium-voltage drives,” IEEE Trans. Ind. Electron., vol. 54, no. 6, pp. 2930–2945, Dec. 2007.

[3] H. Abu-Rub, J. Holtz, J. Rodriguez, and G. Baoming, “Medium-voltage multilevel inverters: State of the art, challenges, and requirements in industrial applications,” IEEE Trans. Ind. Electron., vol. 57, no. 8, pp. 2581–2596, Aug. 2010.

[4] S. Kouro, M. Malinowski, K. Gopakumar, J. Pou, L. G. Franquelo, B. Wu, J. Rodriguez, M. A. Perez, and J. I. Leon, “Recent advances and industrial applications of multilevel converters,” IEEE Trans. Ind. Electron., vol. 57, no. 8, pp. 2553–2580, Aug. 2010.

[5] P. R. Bana, K. P. Panda, R. T. Naayagi, P. Siano, and G. Panda, “Recently Developed Reduced Switch Multilevel Inverter for Renewable Energy Integration and Drives Application: Topologies, Comprehensive Analysis and Comparative Evaluation,” IEEE Access, vol. 7, pp. 54888–54909, 2019.