An Improved Imperialist Competitive Algorithm to Solve the Selected Harmonic Elimination Pulse-Width Modulation in Multilevel Converters

Abstract

The traditional intelligent algorithms for the selected harmonic elimination pulse-width modulation (SHEPWM) of multilevel converters provide low convergent rate and low accuracy of solutions when solving quarter-wave symmetry nonlinear equations. To obviate this problem and obtain a better modulating performance, an improved imperialist competition algorithm is proposed. The proposed algorithm enhances the global search ability by using moving imperialists. Also, a novel type of particles, named independent countries, are proposed to help the algorithm jump out of the local optimum. These independent countries change their positions using swarm intelligence. Compared with the existing particle swarm algorithm and genetic algorithm, the proposed algorithm has significant advantages by improving the accuracy of solutions and the rate of convergence. Finally, the correctness and effectiveness of the proposed algorithm are verified and evaluated by simulation and experimental results.

Analisis Simulasi Inverter Multilevel Kaskade dengan Teknik Selective Harmonic Elimination Pulse Width Modulation

“…Berbagai penelitian juga telah dilakukan untuk meningkatkan kinerja inverter multilevel, antara lain: a) eliminasi harmonisa menggunakan prakalkulasi fungsifungsi pensaklaran [9], b) mengembangkan topologitopologi inverter multilevel [10], [11] dan c) memperbaharui strategi kendali [12]. Penelitian lainnya [13]- [15], melaporkan bahwa inverter-inverter multilevel yang sudah dikembangkan berhasil beroperasi pada frekwensi rendah.…”

A novel adaptive invasive weed optimization technique and least square regression for harmonics minimization in standalone PV applications

“…27,41 These algorithms are not complex and are easy to execute and perceive. Most commonly used intelligent algorithms are genetic algorithm (GA), 42,43 hybrid genetic algorithm, 44 particle swarm optimization (PSO), [45][46][47] hybrid asynchronous particle swarm optimization (HAPSO), 27 artificial bee colony (ABC), 48,49 ant colony optimization (ACO), 50 differential evolution (DE), 51 bacterial foraging optimization, 52 imperialist competitive algorithm (ICA) 53 and improved ICA, 53 evolutionary algorithm, 54 and hybrid techniques such as PSO-GA. 55 The execution of these intelligent algorithms highly depends upon the objective function formulation. However, the speed of convergence is normally slow than the numerical techniques.…”

Voltage Jump Suppression and Capacitor Voltage Fluctuation Analysis for a Four-Level Hybrid Flying Capacitor T-Type Converter

“…Thanks to lower harmonic distortion, switching stress and electromagnetic interference (EMI), multilevel converters are widely used in medium-voltage high-power applications, such as motor drives, renewable power generations and microgrids, etc. [1][2][3]. Meanwhile, due to lower switching losses and reduced cooling and filter requirements, multilevel converters are also becoming more and more popular in low voltage application (e.g., 380 V) where high-density design is required, such as aerospace, electric vehicles and renewable energy [4,5].…”

“…The CHB converter has a modular structure, and is easier to expand to higher voltage levels. However, a phase-shifted transformer is required to provide multiple separated power sources, which increases the system volume and cost [1][2][3][4].…”