Abstract
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.
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