Online tuning control for a switch-sharing based multilevel inverter using capacitor voltage balancing / Zalifah Ramli
In these modern days, energy sustainability has gained increasing attention, bringing about the reinforcement of numerous attempts to utilize renewable energy and improve energy efficiency. In relation to this, multilevel inverters, which come from a family of power electronic converters, have a...
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| Format: | Thesis |
| Published: |
2022
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| Online Access: | http://studentsrepo.um.edu.my/14502/2/Zalifah.pdf http://studentsrepo.um.edu.my/14502/1/Zalifah_Ramli.pdf http://studentsrepo.um.edu.my/14502/ |
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| Summary: | In these modern days, energy sustainability has gained increasing attention, bringing
about the reinforcement of numerous attempts to utilize renewable energy and improve
energy efficiency. In relation to this, multilevel inverters, which come from a family of
power electronic converters, have a great potential to play an important role in
contributing to this field. One type of multilevel inverter which has the potential to
perform the task is the switch-sharing-based multilevel inverter. The switch-sharingbased
multilevel inverter offers several benefits, such as decreasing the complexity of a
circuit, minimizing power losses and contributing to smaller filter size. However, just like
diode-clamped multilevel inverter, the switch-sharing-based multilevel inverter also
suffers from the unbalanced capacitor voltage issue. This phenomenon degrades the
voltage waveforms for the AC-side, which results in an unfavorable operation of the
inverter. Therefore, this research adopts the approach of implementing a capacitor voltage
balancing circuit based on a buck-boost converter in a five-level switch-sharing-based
multilevel inverter topology. For this approach, a performance-based online tuning
control based on proportional-integral (PI) configuration is proposed to balance and
maintain the capacitor voltages at the desired levels and improve the dynamic
performance. Through MATLAB/SIMULINK simulation, a detailed analysis of the
results for the buck-boost converter with the proposed online controller with
performance-based tuning has been made. For validation purposes, the buck-boost
converter has been constructed in the laboratory, and the controller has been implemented
on a digital signal processor (DSP). The test conducted with an experimental five-level
switch-sharing-based multilevel inverter reveals that satisfactory results have been achieved. Simulation and experimental results reveal that the capacitor voltages can be
balanced at high modulation indexes with improved current harmonic performance able to be acquired at the inverter’s output.
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