Development of an enhanced multilevel converter using an efficient fundamental switching technique

 ABSTRACT:

This paper presents a new 1-ϕ multilevel inverter topology, which requires a reduced number of switching components, leading to a reduction in the overall expenditure, and enhances reliability for 1-ϕ applications. Without employing any additional H-bridge circuit, the proposed topology can generate both positive and negative polarity output with reduced switching losses and voltage stress. A detailed comparison with some of the prominent multilevel inverters has been presented, which indicates the superiority of the proposed inverter in terms of its design. In addition, to mitigate the harmonics content in the output response, the fundamental sine quantized switching technique has been incorporated into the proposed configuration. The operation and performance of the proposed multilevel inverter have been ascertained by MATLAB/SIMULINK simulation. Finally, a 21-level experimental prototype has been developed to validate theoretical analysis and exhibit the merits of the proposed topology.

KEYWORDS:

1.      Fundamental sine quantized switching technique (FSQST)

2.      Multilevel inverter (MLI)

3.      Total harmonics distortion (THD)

SOFTWARE: MATLAB/SIMULINK

CONCLUSION:

 In this work a new modified MLI topology has been proposed with voltage rating of the individual power MOSFETs less than the actual output voltage rating. Also the total number of the semiconductor switches and DC supplies requirement is less. Similarly, it can be inferred that by implementing the FSQST switching technique in the proposed topology, it provides better harmonics profile in the output response while keeping the switching loss minimum. Thus, the proposed inverter is more economic as well as exhibits higher overall efficiency. So, this proposed topology can be used for medium and high power applications.

REFERENCES:

[1] Saccol GA, Giacomini JC, Batschauer AL, Rech C. Comprehensive analysis of singlephase full-bridge asymmetrical flying capacitor inverters. IEEE Trans Ind Appl 2019;55(2):1775–86. https://doi.org/10.1109/TIA.2018.2883549.

[2] Amamra S, Meghriche K, Cherifi A, Francois B. Multilevel inverter topology for renewable energy grid integration. IEEE Trans Industr Electron 2017;64(11):8855–66. https://doi.org/10.1109/TIE.2016.2645887.

[3] Das MK, Jana KC, Sinha A. Performance evaluation of an asymmetrical reduced switched multi-level inverter for a grid-connected pv system. IET Renew Power Gener 2018;12(2):252–63. https://doi.org/10.1049/iet-rpg.2016.0895.

[4] Yang S, Liu Y, Wang X, Gunasekaran D, Karki U, Peng FZ. Modulation and control of transformerless upfc. IEEE Trans Power Electron 2016;31(2):1050–63. https://doi. org/10.1109/TPEL.2015.2416331.

[5] Quraan M, Tricoli P, D’Arco S, Piegari L. Efficiency assessment of modular multilevel converters for battery electric vehicles. IEEE Trans Power Electron 2017;32(3):2041–51. https://doi.org/10.1109/TPEL.2016.2557579.