A medium voltage CHB Inverter with a modified THPWM for Step-Up-Transformer-Less and Line-Filter-Less Grid Integration

Biswas, S.P., Islam, Md.R., Anower, Md.S., Rahman, M.M. and Arefi, A.ORCID: 0000-0001-9642-7639 (2021) A medium voltage CHB Inverter with a modified THPWM for Step-Up-Transformer-Less and Line-Filter-Less Grid Integration. In: 31st Australasian Universities Power Engineering Conference (AUPEC) 2021, 26 - 30 September 2021, Perth, WA

Abstract

A simple traditional inverter which generates a square wave is not satisfactory for grid integration. A pure sinusoidal wave is highly desired for grid tied inverter. Multilevel inverter (MLI) has emerged a key technological development in the field of energy control for high-power medium-voltage (6–36 kV) by generating sinusoidal output waveform without using large and bulky line filter. The cascaded H-bridge (CHB) inverters produce more output voltage levels (e.g., more sinusoidal) in the medium-voltage range, hence minimize the harmonic components. In this paper, a fifty-five level (55L) CHB converter is designed, simulated, and analyzed for 11kV system using a new modified third harmonic injected pulse width modulation-based (MTHPWM) switching technique. Performance of existing switching techniques and proposed switching technique with a 55L, 3- ϕ , 11kV CHB inverter is evaluated in terms of total harmonic distortion (THD) and inverter loss. The proposed modulation scheme results very promising THD profile (3.41%) and reduces switching losses over other conventional modulation techniques. All the simulated results are carried out in the MATLAB/Simulink environment.

Item Type:	Conference Paper
Murdoch Affiliation(s):	Engineering and Energy
URI:	http://researchrepository.murdoch.edu.au/id/eprint/63714

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