A novel optimization harmonic elimination technique for cascaded multilevel inverter

Ezzidin Hassan Aboadla, Sheroz Khan, Mohamed H. Habaebi, Teddy Surya Gunawan, Belal A. Hamida, Mashkuri Bin Yaacob, Ali Aboadla

Abstract


The main goal of utilizing Selective Harmonic Elimination (SHE) techniques in Multilevel Inverters (MLI) is to produce a high-quality output voltage signal with a minimum Total Harmonic Distortion (THD). By calculating N switching angles, SHE technique can eliminate (N-1) low order odd harmonics of the output voltage waveform. To optimized and obtained these switching angles, N of nonlinear equations should be solved using a numerical method. Modulation index (m) and duty cycle play a big role in selective harmonic elimination technique to obtain a minimum harmonic distortion and desired fundamental component voltage. In this paper, a novel Optimization Harmonic Elimination Technique (OHET) based on SHE scheme is proposed to re-mitigate Total Harmonic Distortion. The performance of seven-level H-bridge cascade inverter is evaluated using PSIM and validated experimentally by developing a purposely built microcontroller-based printed circuit board.

Keywords


Cascaded Multilevel Inverter; Duty cycle; Optimization technique; Selective Harmonic Elimination; Switching angles

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