Application of improved firefly algorithm for programmed PWM in multilevel inverter with adjustable DC sources |
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| Affiliation: | 1. Department of Electrical and Electronics Engineering, Government College of Engineering, Tirunelveli, India;2. Department of Electrical and Electronics Engineering, Anna University, Chennai, India;1. Instituto Nacional de Astrofósica, Óptica y Electrónica, Computer Science Department, Luis Enrique Erro No. 1, Sta. Ma. Tonantzintla, C.P. 72840 Puebla, Mexico;2. MindLab, Computing Systems and Industrial Engineering Department, Universidad Nacional de Colombia, Cra 30 No 45 03-Ciudad Universitaria, Bogotá DC, Colombia;1. EPSRC Centre in Through-Life Engineering Services, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK;2. Enhanced Composites and Structures Centre, Manufacturing and Materials Department, School of Applied Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK;1. Department of Oncology;2. Department of Pediatrics;3. Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD |
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| Abstract: | Programmed pulse width modulation is an optimized pulse width modulation which is particularly applicable for high-power applications where the power losses must be kept below firm limits. Based on the offline estimation, it is capable of pre programming the harmonic profile of the output waveform over a range of modulation indices by eliminating some lower order harmonics. In this paper, improved firefly algorithm (FA) is applied to determine the optimum switching angles for the 11- level cascaded H bridge multilevel inverter (MLI) with adjustable DC sources in order to eliminate pre specified lower order harmonics and to achieve the desired fundamental voltage. Though number of optimization algorithms is available for the estimation of switching angles, Firefly algorithm takes least computation time and surpasses all other 11 metaheuristic Algorithms. The algorithm and the model are developed using MATLAB and the validity of the simulation is confirmed by an experimental setup using FPGA Spartan 6A DSP. Results are compared with the results obtained using particle swarm optimization (PSO) and artificial bee colony algorithm (ABCA) and it is proved that the proposed method offers reduced total harmonic distortion (THD) with less computation period. |
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| Keywords: | Programmed PWM Cascaded multilevel inverter Firefly algorithm FPGA |
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