Voltage and Current THD Minimization of a Single-Phase Multilevel Inverter With an Arbitrary RL-Load Using a Time-Domain Approach

This article presents a time-domain optimization technique for minimizing harmonic content in the output voltage and current waveforms of a single-phase multilevel inverter (MLI) topology with an arbitrary RL -load. The effect of the modulation index and the load parameters variation on the harmoni...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2021-12, Vol.9 (6), p.6817-6827
Main Authors: Kar, Pratik Kumar, Priyadarshi, Anurag, Karanki, Srinivas Bhaskar, Ruderman, Alex
Format: Article
Language:English
Subjects:
Electric potential
Harmonic analysis
Harmonic distortion
Inverters
Multilevel inverters (MLIs)
optimal switching angles
Optimization
Optimization techniques
Power electronics
staircase modulation
Switches
Switching
Time constant
Time division multiplexing
Time domain analysis
Topology
total harmonics distortion (THD)
Voltage
Waveforms
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Summary:This article presents a time-domain optimization technique for minimizing harmonic content in the output voltage and current waveforms of a single-phase multilevel inverter (MLI) topology with an arbitrary RL -load. The effect of the modulation index and the load parameters variation on the harmonic content of load voltage and current have also been analyzed. A single-phase 21-level MLI is developed to verify the proposed switching technique. The total harmonic distortion (THD) of the current and voltage in the time-domain is considered as the optimization constraint to compute the inverter's optimal switching angles. In addition, the load time constant has also been considered during optimization problem formulation, which enables superior inverter performance in terms of lower THD in the output response. The detailed theoretical, simulation, and experimental analysis are carried out on the presented topology to verify the proposed switching technique's performance.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2021.3050787