Abstract
Solving of nonlinear transcendental equations with multiple solutions is a complex task of selective harmonic elimination pulse-width modulation (SHEPWM) technique for multilevel converters. SHEPWM technique making use of particle swarm optimization (PSO) is considered in this paper. PSO includes varied inertia weight in each iterative procedure in order to decrease falling into the local optimum and improve the algorithm robustness to achieve the global optimum of the solution space. The developed implementation makes it possible to calculate several combinations of switching angles, which is rather difficult to obtain by traditional methods of optimization. The article shows the results of offline calculation of the switching angles to exclude low order harmonics. Research results are simulated and tested by modeling for a three-level neutral point clamped converter. Simulation results show that the above mentioned approach effectively eliminates the specified lower order harmonics, whereas the switching angle trajectory and total harmonic distortion (THD) of output voltage are different. The research results can be used to design SHEPWM algorithms for three-level converters.
Keywords
Power electronics, selective harmonic elimination, particle swarm optimization, total harmonic distortion.
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