Trinary asymmetric cascaded H bridge (1:3:9) multilevel inverter with self‑balanced capacitor

Anil Kumar Yarlagadda; Vimlesh Verma

Trinary asymmetric cascaded H bridge (1:3:9) multilevel inverter with self‑balanced capacitor

Anil Kumar Yarlagadda

Vimlesh Verma

Vol. 22, No. 9, pp. 1522-1531, Sep. 2022

10.1007/s43236-022-00467-1

Cascaded H bridge

Level doubling network

Total harmonic distortion

Multi-level inverter

Abstract

A single-phase trinary asymmetrical cascaded H-bridge (TACHB) inverter with a level doubling network (LDN) is proposed in this paper. It consists of a LDN and ‘n’ H bridges, where ‘n’ represents the number of DC sources. The TACHB-LDN generates N number of levels at the output voltage using log3(N+1/2)DC sources, 4 + 4 log3(N+1/2)switches, and a capacitor. The TACHB-LDN gives an improved power quality output when compared with the conventional trinary CHB inverter for a given number of DC sources. A detailed comparison analysis with existing topologies is presented to show the superiority of the proposed topology. The TACHB–LDN is verified in MATLAB/Simulink for the generation of a 17-level output voltage with two DC sources. The phase disposition level shift pulse width modulation (PD-LSPWM) technique is used to generate the required triggering pulse for the converter. The carrier frequency is considered to be the fundamental frequency to ensure low-frequency switching. Conduction and switching loss are analyzed with the help of PSIM software. The obtained simulation results are verified through a prototype model developed in the laboratory using dSPACE 1104. The total harmonic distortion (THD) of the 17-level output voltage waveform is found to be below 5% (IEEE 519 Standard). The efficiency of the prototype model under different loads is observed to be in the range of 93.65–97.35%.

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Cite this article

[IEEE Style]

A. K. Yarlagadda and V. Verma, "Trinary asymmetric cascaded H bridge (1:3:9) multilevel inverter with self‑balanced capacitor," Journal of Power Electronics, vol. 22, no. 9, pp. 1522-1531, 2022. DOI: 10.1007/s43236-022-00467-1.

[ACM Style]

Anil Kumar Yarlagadda and Vimlesh Verma. 2022. Trinary asymmetric cascaded H bridge (1:3:9) multilevel inverter with self‑balanced capacitor. Journal of Power Electronics, 22, 9, (2022), 1522-1531. DOI: 10.1007/s43236-022-00467-1.