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access icon free Comparative study between different optimisation techniques for finding precise switching angle for SHE-PWM of three-phase seven-level cascaded H-bridge inverter

© The Institution of Engineering and Technology
Received 25/07/2017, Accepted 28/11/2017, Revised 03/11/2017, Published 01/12/2017

Selective harmonic elimination pulse-width modulation (SHE-PWM) works at low-frequency switching, which reduces switching losses, device stress, and increases energy conversion efficiency. So, it can be an effective control strategy for multilevel inverter working on medium-voltage, high-power industrial energy conversion application. It provides desired output voltage by retaining the requested fundamental component as well as eliminating some low-order harmonics. The application of SHE-PWM in industries is having an influence on precise solvability of complex and non-linear equations. This study presents two recently reported optimisation techniques, namely backtracking search algorithm and differential search algorithm (DSA) for obtaining a more accurate solution of the harmonics elimination problem. The superiority of the proposed optimisation algorithms over the well known ancient algorithm such as genetic algorithm, BEE algorithm and particle swarm optimisation have been established by a comparative study with respect to the possibility of attaining global minima, the rank of convergence rate, and inverter performance analysis. Simulation and experimental results validate the efficacy of the DSA optimisation technique for calculating more precise switching angles that totally eliminate 5th- and 7th-order harmonics with fulfilling the requested fundamental component.

Inspec keywords: PWM invertors; switching convertors; search problems; particle swarm optimisation; harmonics suppression; genetic algorithms

Other keywords: selective harmonic elimination pulse-width modulation; 7th-order harmonic elimination; backtracking search algorithm; differential search algorithm; nonlinear equation; particle swarm optimisation; energy conversion efficiency; DSA; complex equation; 5th-order harmonic elimination; SHE-PWM; genetic algorithm; low-order harmonic elimination; medium-voltage high-power industrial energy conversion application; multilevel inverter; BEE algorithm; three-phase seven-level cascaded H-bridge inverter

Subjects: Power supply quality and harmonics; DC-AC power convertors (invertors); Combinatorial mathematics; Optimisation techniques

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