Open AccessMeeting IEC and ER G4/5 harmonic standards in nine‐level cascaded H‐bridge inverters using an improved SHM‐PAM scheme
Author(s) -
Kundu Sourabh,
Banerjee Subrata,
Ronanki Deepak,
Williamson Sheldon S.
Publication year - 2020
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.2020.0884
Subject(s) - modulation index , inverter , pulse width modulation , electronic engineering , control theory (sociology) , matlab , h bridge , total harmonic distortion , voltage , computer science , harmonic , modulation (music) , engineering , electrical engineering , physics , control (management) , quantum mechanics , artificial intelligence , operating system , acoustics
This study introduces a new switching scheme for nine‐level cascaded H‐bridge (CHB) inverter to comply with the harmonic standards (IEC 61000‐2‐12, IEC 61000‐3‐6, and ER G4/5) using an improved selective harmonic minimisation pulse amplitude modulation (SHM‐PAM) scheme. In this scheme, the optimised switching instances and variable DC‐link voltages are determined by solving some new constraints based cost functions using particle swarm optimisation (PSO) technique. The theoretical analysis and optimisation results of the proposed modulation scheme are validated through MATLAB simulations and experimentally on a laboratory‐scale prototype of CHB inverter. The proposed modulation scheme utilises a minimal number of switching instances in a fundamental period and optimisation variables in the problem formulation in comparison to conventional SHE‐PWM and SHE‐PAM schemes. The key performance of the proposed scheme in terms of harmonic and loss analysis is evaluated over the wide range of the power factors and modulation index. Finally, the suitability of the proposed scheme is tested for the closed‐loop speed control of a 5 hp, 415 V three‐phase induction motor.