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Vijayalakshmi V.J.,KPR Institute of Engineering and TechnologyTamilnadu | Ravichandran C.S.,Sri Ramakrishna Engineering CollegeTamilnadu | Amudha A.,Karpagam UniversityTamilnadu
Journal of Theoretical and Applied Information Technology | Year: 2014

The objective of the proposed work is to design a multilevel inverter for solar energy applications so as to reduce the Total Harmonic Distortion (THD) and to improve the power quality. To obtain the accurate THD values inclusion of higher order harmonics is essential. A concept of Dual Phase Analysis (DPA) is introduced in this paper. DPA proposes an accurate method to determine the harmonics content in the inverters. A novel concept of application of Heuristic Optimization techniques for estimating the optimum switching angles for the voltage and harmonic control of cascaded multilevel inverters is performed. In this work, neural network based on Gradient Descent Optimization is the preferred Heuristic algorithm. The Neural Network can be trained offline and online. DPA is used in analyzing the harmonic spectrum of the multilevel inverter output. In this paper, the performance of seven level inverters for solar energy application is designed and analyzed. © 2005 - 2014 JATIT & LLS. All rights reserved.


Vijayalakshmi V.J.,KPR Institute of Engineering and TechnologyTamilnadu | Ravichandran C.S.,Sri Ramakrishna Engineering CollegeTamilnadu | Amudha A.,Karpagam UniversityTamilnadu | Mohamed Ibrahim A.,KPR Institute of Engineering and TechnologyTamilnadu
International Journal of Applied Engineering Research | Year: 2015

The concept of dual phase analysis based harmonic elimination in multilevel inverter is introduced in this paper. To obtain accurate THD value and the harmonic spectrum, inclusion of higher order harmonics is very essential. A novel concept of application of Heuristic Optimization techniques for estimating the optimum switching angles for the voltage and harmonic control of cascaded multilevel inverters is performed. The Selected Harmonic Elimination strategy is used for harmonic control. In this paper, neural network based on Gradient Descent Optimization is the preferred Heuristic algorithm. The Neural Network can be trained offline and online. It is trained off line using the voltage profile of the desired switching angles given by the classic harmonic elimination strategy to any value of the modulation index. Dual Phase Analysis (DPA) is used in analyzing the voltage profile and the harmonic spectrum of the multilevel inverter output. After training the proposed Artificial Neural Network (ANN) system, a large and memory demanding look-up table is replaced with trained neural network to generate the optimum switching angles with lowest Total Harmonic Distortion (THD) for a given modulation index. © Research India Publications.


Maruthupandi P.,Government College of Technology, Coimbatore | Devarajan N.,Government College of Technology, Coimbatore | Sebasthirani K.,Sri Ramakrishna Engineering CollegeTamilnadu | Jose J.K.,Government College of Technology, Coimbatore
JVC/Journal of Vibration and Control | Year: 2015

Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this work an attempt has been made to improve the power quality by minimizing the harmonic content in the output voltage of a cascaded multilevel inverter using the selective harmonic elimination pulse width modulation technique. Sinusoidal PWM technique is used to generate the switching signals. A single phase nine-level cascaded multilevel inverter with identical DC supply is designed to reduce the harmonic components of the output voltage. Particle swarm optimization technique is applied to determine the optimum switching angles, thereby reducing some higher-order harmonics while maintaining the required fundamental voltage. This generalized technique can be extended to multilevel inverters with any number of levels. The total harmonic distortion is measured accordingly for different modulation indices. A prototype model of a field programmable gate array-based nine-level inverter has been designed, fabricated and tested. The results are presented and analyzed and hence the hardware results are verified with the simulation results. © The Author(s) 2013.

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