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

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

S.P. Biswas, Md.R. Islam, Md.S. Anower, M.M. Rahman and A. Arefi
2021 31st Australasian Universities Power Engineering Conference (AUPEC)
31st Australasian Universities Power Engineering Conference (AUPEC) 2021 (Perth, WA, 26/09/2021–30/09/2021)
2021
DOI: https://doi.org/10.1109/AUPEC52110.2021.9597720
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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.

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