Selective harmonic elimination method for wide range of modulation indexes in multilevel inverters using ICA
来源期刊：中南大学学报(英文版)2014年第4期
论文作者：Ali Ajami Mohammad Reza Jannati Oskuee Ataollah Mokhberdoran Hossein Shokri
文章页码：1329 - 1338
Key words：selective harmonic elimination; DC-DC converter; imperialist competitive algorithm (ICA)
Abstract: Selective harmonic elimination (SHE) in multilevel inverters is an intricate optimization problem that involves a set of nonlinear transcendental equations which have multiple local minima. A new advanced objective function with proper weighting is proposed and also its efficiency is compared with the objective function which is more similar to the proposed one. To enhance the ability of the SHE in eliminating high number of selected harmonics, at each level of the output voltage, one slot is created. The SHE problem is solved by imperialist competitive algorithm (ICA). The conventional SHE methods cannot eliminate the selected harmonics and satisfy the fundamental component in some ranges of modulation indexes. So, to surmount the SHE defect, a DC-DC converter is applied. Theoretical results are substantiated by simulations and experimental results for a 9-level multilevel inverter. The obtained results illustrate that the proposed method successfully minimizes a large number of identified harmonics which consequences very low total harmonic distortion of output voltage.
Ali Ajami, Mohammad Reza Jannati Oskuee, Ataollah Mokhberdoran, Hossein Shokri
(Electrical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iran)
Abstract:Selective harmonic elimination (SHE) in multilevel inverters is an intricate optimization problem that involves a set of nonlinear transcendental equations which have multiple local minima. A new advanced objective function with proper weighting is proposed and also its efficiency is compared with the objective function which is more similar to the proposed one. To enhance the ability of the SHE in eliminating high number of selected harmonics, at each level of the output voltage, one slot is created. The SHE problem is solved by imperialist competitive algorithm (ICA). The conventional SHE methods cannot eliminate the selected harmonics and satisfy the fundamental component in some ranges of modulation indexes. So, to surmount the SHE defect, a DC-DC converter is applied. Theoretical results are substantiated by simulations and experimental results for a 9-level multilevel inverter. The obtained results illustrate that the proposed method successfully minimizes a large number of identified harmonics which consequences very low total harmonic distortion of output voltage.
Key words:selective harmonic elimination; DC-DC converter; imperialist competitive algorithm (ICA)
