Novel Implementation of RPWM Selective Harmonic Elimination (RPWM-SHE)

Eng, Zinq Hong (2025) Novel Implementation of RPWM Selective Harmonic Elimination (RPWM-SHE). Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

This project introduces a novel inverter control strategy known as Random Pulse Width Modulation with Selective Harmonic Elimination (RPWM-SHE), which effectively reduces Total Harmonic Distortion (THD) and Electromagnetic Interference (EMI) in single-phase Voltage Source Inverters (VSIs). By integrating the targeted harmonic elimination capability of Selective Harmonic Elimination (SHE) with the spectral spreading benefits of Random PWM (RPWM), and optimising the switching cycle via a Genetic Algorithm (GA), the RPWM-SHE method enables precise suppression of low-order harmonics while minimising EMI. Implemented and simulated in MATLAB Simulink, the technique is evaluated under both static and dynamic loading conditions and benchmarked against conventional Sine-PWM, RPWM, and SHE-PWM methods. Results show RPWM-SHE achieves the lowest THD, which is 6.62% under static load and 4.47% under dynamic load. This method also exhibit the lowest low-order harmonic amplitudes, 0.43% at the 7th harmonic and maintaining a compact noise spectrum within 5–20 dB. These improvements enhance waveform quality, inverter efficiency and acoustic performance, making RPWM-SHE a promising solution for renewable energy systems, motor drives and electric vehicles. Additionally, the method supports Sustainable Development Goals (SDGs) by promoting energy efficiency (SDG 7), advancing industry innovation (SDG 9), and reducing energy waste and hardware wear (SDG 12).