Simulation of single phase fuel cell powered transformerless multilevel inverter using H-Bridge cascade topology
In this thesis, a multilevel inverter is constructed using H-Bridge Cascaded circuit to obtain output voltage for three, five, seven and nine level. It is operated without transformer to obtain a nominal voltage of240V. It needs DC voltage from fuel cell that will convert to the AC nominal voltage...
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| Format: | Thesis |
| Language: | English |
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| Online Access: | http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/63444/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/63444/2/Full%20text.pdf |
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| Summary: | In this thesis, a multilevel inverter is constructed using H-Bridge Cascaded circuit to obtain output voltage for three, five, seven and nine level. It is operated without
transformer to obtain a nominal voltage of240V. It needs DC voltage from fuel cell that
will convert to the AC nominal voltage. This research was discussed about the output
voltage waveform of the H-Bridge Cascaded multilevel inverter approaches the pure
sine wave simulation. The simulation uses MA TLAB software to get the output
waveform from fuel cell and the H-Bridge cascaded multilevel inverter topology. The
topology is to obtain optimal values of voltage angle. The optimum voltage angle results
will reduce the lowest (THD) total harmonic distortion and to be implemented in this
research. The simulation results will be compared based on the THD results. As the level
increases from three to nine levels, the THD shows significant improvement of reduces
from 36.13% to 10.14%. Therefore, among three to nine levels of H-Bridge Cascaded
multilevel inverter, only the nine levels was chosen for further analysis. The analysis
was using SHEPWM switching technique. Comparison between the results analysis of
nine levels for modulation indexes 0.75 to 1, has obtained that 10.14% is the best THD
results. The comparison results are approximately equal between fuel cell and reference
of previous researcher based on the simulation. Therefore, fuel cell also can be used as
DC voltage source transformerless multilevel inverter. |
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