Comparative study of switching strategies for cascaded H-bridge multilevel inverter
Multilevel inverters are capable of producing AC staircase output waveform without bulky passive filter. Therefore, among different types of inverters the multilevel inverters are gaining popularity for photovoltaic applications. If the switching angle of every voltage level is not carefully chos...
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| Format: | Thesis |
| Language: | English |
| Published: |
Universiti Malaysia Perlis (UniMAP)
2019
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| Subjects: | |
| Online Access: | http://dspace.unimap.edu.my:80/xmlui/handle/123456789/61983 |
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| Summary: | Multilevel inverters are capable of producing AC staircase output waveform without
bulky passive filter. Therefore, among different types of inverters the multilevel
inverters are gaining popularity for photovoltaic applications. If the switching angle of
every voltage level is not carefully chosen then the total harmonic distortion (THD) of
voltage output waveform may become unacceptable. In this project, four switching angle
arrangement techniques are applied to a cascaded H-bridge multilevel inverter. The
performance of 3-, 5-, 7-, 9-, 11-, 13- and 15-level cascaded H-bridge multilevel inverter
with four switching angle arrangement techniques at different power factor loads have
been evaluated and compared by using PSIM software. The purpose of evaluating and
comparing the simulation results of cascaded H-bridge multilevel inverter with different
power factor loads is to analyze the effects of inductive load on the THD of voltage and
current. Simulation results show that one of technique is able to generate an output
voltage and current waveform with lowest THD whilst one of the power factor loads is
also able to produce the output current waveform with lowest THD. In addition, one of
the techniques produces output voltage waveform with the highest fundamental voltage
component. |
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