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JPE, Vol. 17, No. 5, September 2017
Improving the Solution Range in Selective Harmonic Mitigation Pulse Width Modulation Technique for Cascaded Multilevel Converters
Mohammad Najjar, Hossein Iman-Eini, Amirhossein Moeini, and Shahrokh Farhangi
Area High Power Converters
Abstract This paper proposes an improved low frequency Selective Harmonic Mitigation-PWM (SHM-PWM) technique. The proposed method mitigates the low order harmonics of the output voltage up to the 50th harmonic well and satisfies the grid codes EN 50160 and CIGRE-WG 36?05. Using a modified criterion for the switching angles, the range of the modulation index for non-linear SHM equations is improved, without increasing the switching frequency of the CHB converter. Due to the low switching frequency of the CHB converter, mitigating the harmonics of the converter up to the 50th order and finding a wider modulation index range, the size and cost of the passive filters can be significantly reduced with the proposed technique. Therefore, the proposed technique is more efficient than the conventional SHM-PWM. To verify the effectiveness of the proposed method, a 7-level Cascaded H-bridge (CHB) converter is utilized for the study. Simulation and experimental results confirm the validity of the above claims.
Keyword Cascaded H-bridge inverter,Multilevel converter,Particle swarm optimization,Selective harmonic mitigation
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