Elimination of Low Order Harmonics in Multilevel Inverters Using Genetic Algorithm

Reza Salehi; Naeem Farokhnia; Mehrdad Abedi; Seyed Hamid Fathi

Elimination of Low Order Harmonics in Multilevel Inverters Using Genetic Algorithm

Vol. 11, No. 2, pp. 132-139, Mar. 2011

10.6113/JPE.2011.11.2.132

Genetic Algorithm (GA)

Multi-level inverter

Selective Harmonic Elimination Pulse Width Modulation (SHEPWM)

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Abstract

The selective harmonic elimination pulse width modulation (SHEPWM) switching strategy has been applied to multilevel inverters to remove low order harmonics. Naturally, the related equations do not have feasible solutions for some operating points associated with the modulation index (M). However, with these infeasible points, minimizing instead of eliminating harmonics is performed. Thus, harmful harmonics such as the 5th harmonic still remains in the output waveform. Therefore, it is proposed in this paper to ignore solving the equation associated with the highest order harmonics. A reduction in the eliminated harmonics results in an increase in the degrees of freedom. As a result, the lower order harmonics are eliminated in more operating points. A 9-level inverter is chosen as a case study. The genetic algorithm (GA) for optimization purposes is used. Simulation results verify the proposed method.

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Cite this article

[IEEE Style]

R. Salehi, N. Farokhnia, M. Abedi, S. H. Fathi, "Elimination of Low Order Harmonics in Multilevel Inverters Using Genetic Algorithm," Journal of Power Electronics, vol. 11, no. 2, pp. 132-139, 2011. DOI: 10.6113/JPE.2011.11.2.132.

[ACM Style]

Reza Salehi, Naeem Farokhnia, Mehrdad Abedi, and Seyed Hamid Fathi. 2011. Elimination of Low Order Harmonics in Multilevel Inverters Using Genetic Algorithm. Journal of Power Electronics, 11, 2, (2011), 132-139. DOI: 10.6113/JPE.2011.11.2.132.