Generalized Selective Harmonic Elimination Technique For Cascaded H-Bridge Multilevel Inverter

Applasamy, Komathi (2015) Generalized Selective Harmonic Elimination Technique For Cascaded H-Bridge Multilevel Inverter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. Multilevel inverters are emerging as the new breed of power converter options for high power applications. They typically synthesize the staircase voltage waveform (from several dc sources) which has reduced harmonic content. This report presents an implementation of selective harmonic elimination (SHE) modulation for a single-phase 7-level cascaded H-bridge multilevel inverter. The optimum switching angle of the SHE equations is taken from the reference [45] where Newton-Raphson method is used in solving the transcendental equation describing the fundamental and harmonic components. The proposed SHE scheme is performed through simulation using MATLAB/SIMULINK. This simulation results are then verified through experimental using H-bridge modules, gate drivers and Altera Field Programmable Gate Array (FPGA) controller. The proposed SHE is efficient in eliminating the 3rd and 5th order harmonics and produces a higher quality with a better harmonic profile and sinusoidal shape of the stepped output waveform.

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