Abstract

Inverter play important role in power system especially with it capability on reducing system size and increase efficient. Recent research trend of power electronics system are focusing on multilevel inverter topic in optimization on voltage output, reduce total harmonics distortion, modulation technique and switching configuration. Standalone application multilevel inverter is high focused due to the rise of renewable energy policy all around the world. Hence, this research emphasis on identify best topology of multilevel inverter and optimize it among the diode-clamped, capacitor clamped and cascaded H-bridge multilevel inverter to be used for standalone application in term of total harmonics distortion and voltage boosting capability. The first part of research that is identify best topology multilevel inverter is applying sinusoidal pulse width modulation technique. The result shown cascade H-bridge give the best output in both total harmonics distortion (9.27%) and fundamental component voltage (240 Vrms). The research proceed with optimization with fundamental switching frequency method that is optimized harmonic stepped waveform modulation method. The selective harmonics elimination calculation have adapt with genetic algorithm and particle swarm optimization in order to speed up the calculation. Both bio-inspired algorithm is compared in term of total harmonic distortion and selected harmonics elimination for both equal and unequal sources. In overall result shown both algorithm have high accuracy in solving the non-linear equation. However, genetic algorithm shown better output quality in term of selected harmonics elimination where overall no exceeding 0.4%. Particle swarm optimization shows strength in finding best total harmonics distortion where in 7-level cascaded H-bridge multilevel inverter (m=0.8) show 6.8% only as compared to genetic algorithm. Simulation for 3-level, 5-level and 7-level for each multilevel inverter at different circumferences had been done in this research. The result draw out a conclusion where the possibility of having a filterless high efficient invert can be achieve.

Highlights

  • Inverters can be classified into two main types, that is, voltage source inverter (VSI) and current source inverter (CSI)

  • For seven-level Cascaded Hbridge multilevel inverter (CHB-MLI) with optimized harmonic stepped waveform (OHSW) by genetic algorithm (GA), 8.9% of total harmonic distortion (THD), which is 0.37%, is lower compared to Sinusoidal pulse width modulation (SPWM) modulation method

  • The benefits for the low switching frequency are the increase of life span of the switching device and reduced power loss which is due to high switching frequency

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Summary

Introduction

Inverters can be classified into two main types, that is, voltage source inverter (VSI) and current source inverter (CSI). VSI transformer-less inverter popular in renewable energy (RE) application due to overall size reduction. High-power application ideally requires low switching losses. Numberless of literature has proven multilevel inverter is a practical solution on resolving high switching losses problem exist in conventional inverter for high power application [6]. Research trends nowadays are more focusing on several multilevel inverter topologies for renewable energy source application. Multilevel inverter topologies generate multilevel voltage source output which synthesizes the staircase waveform from single or multiple low DC voltage source. Cascaded Hbridge multilevel inverter (CHB-MLI) and it modified topologies is highly grab researchers attention due to the flexibility toward renewable energy. Inverter topology system consists of the most part include switch, power sources, topology configuration, and filter system. Switching strategy aid in manipulate the harmonic profile for the inverter output waveform. The overview for this chapter is to introduce genetic algorithm and particle swarm optimization in resolving the SHE which eliminates the low order of undesired harmonics

Multilevel inverter
Cascaded H-bridge multilevel inverter
Sinusoidal pulse width modulation
Optimized harmonic stepped waveform
Fourier series approach voltage output
Selective harmonic elimination calculation
Bioinspired algorithm
Genetic algorithm
Particle swarm optimization algorithm
Result and discussion
Simulation of three-level CHB-MLI with OHSW method (equal sources)
Overall result
Findings
Conclusion
Future works
Full Text
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