Design of selective harmonic elimination technique for three phase voltage source inverter

Sim, Faustina Mei Ching (2021) Design of selective harmonic elimination technique for three phase voltage source inverter. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays, the performance of the inverter has become an integral part of contributing to an efficient power system. The development of Selective Harmonic Elimination Inverter Technology plays a vital role in electrical applications. This development has increasingly taken over from conventional two-level inverters in industrial applications. In this project, a two-level inverter with the SHE-PWM technique is used to eliminate specific low-order harmonics, thus improving the THD of the waveform output. Since the structure of the equation derived from the Fourier transform is non-linear and transcendental, the amplitude of any odd harmonics in the output signal is calculated using any specific modulation index and Fourier series. In this project, a method is proposed to obtain the required switching angles for the SHE PWM technique is the Newton-Raphson method which is used to solve transcendental equations to find switching angles for a three-phase inverter with some random initial assumption that would yield all desirable solutions. Seven switching angles for modulation index 1.0 have been solved by using the Newton-Raphson method and MATLAB/SIMULINK program where the first harmonic was controlled and 5th, 7th, 11th, 13th, 17th, and 19th harmonics was eliminated. The simulated results of the three-phase two-level Voltage Source Inverter for the phase voltage, output current, and line-to-line voltage, and total harmonic distortion has been analyzed. The simulation results also demonstrated using various RL loads and a motor. The overall simulation results meet the IEEE STD. 1547 Requirements for maximum Harmonic Distortion.

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