Open AccessImprovement of power utilisation capability for a three‐phase seven‐level CHB inverter using an improved selective harmonic elimination–PWM scheme by sharing a desired proportion of power among the H‐bridge cells
Author(s) -
Kundu Sourabh,
Bhowmick Supratik,
Banerjee Subrata
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5076
Subject(s) - pulse width modulation , h bridge , power (physics) , harmonic , inverter , total harmonic distortion , scheme (mathematics) , electronic engineering , three phase , bridge (graph theory) , half bridge , computer science , control theory (sociology) , engineering , medicine , electrical engineering , mathematics , voltage , physics , control (management) , quantum mechanics , artificial intelligence , mathematical analysis
An improved selective harmonic elimination‐pulse width modulation (SHE‐PWM) scheme has been proposed for a three‐phase seven‐level cascaded H‐bridge (CHB) inverter that enhances the power utilisation capability of the inverter by sharing the desired amount of power among the H‐bridge cells and also eliminates both 5th‐ and 7th‐order harmonic components from the inverter output voltage maintaining the desired fundamental voltage component for a wide range of modulation index. Compared to conventional SHE‐PWM, this scheme introduces two additional switching in the first cell, while the second and the third cells are switched at advanced switching angles. The differential search algorithm (DSA) technique has been applied to solve the proposed SHE‐PWM scheme, and it exhibited comparatively better performance than the algorithm based on genetic algorithm, BEE algorithm and particle swarm optimisation. The effectiveness of the proposed scheme has been verified by both simulation and experimental study on a seven‐level CHB inverter. Finally, the proposed scheme has been applied to the closed‐loop constant V/f control of the induction motor drive application. It has been established that the proposed scheme is independent of the load power factor angle, and it improved the power conversion efficiency of the conventional SHE‐PWM scheme.