Final Year Project Report

Zolkifri, Nur Izzati (2016) Final Year Project Report. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text Final Year Project Report - Nur Izzati Zolkifri - 24 Pages.pdf - Submitted Version Download (641kB)

Abstract

The usage of power electronic device has been widely used in industrial as well as in domestic system. Consequently, it will develop power quality problem in distribution system. High Total Harmonic Distortion (THD) and low power factor is a main problem that caused by non-linear loads. This is because non-linear load generate a non-sinusoidal waveform passes through the distribution system which leads to voltage and current harmonics. Indirectly, current harmonic can cause problem to the load itself such as losses, overheating and overloading. The main objective of this project is to improve the power quality as well as to simulate and analyze the performance of single phase shunt Active Power Filter (APF) based on Fast Fourier Transform (FFT) method. In this project Photovoltaic solar panel is the power supply and converted to alternating current (AC) by cascaded H-bridge Multilevel Inverter (MLI) which uses Pulse Width Modulation (PWM) technique as controller. Furthermore, MLI with PWM control scheme produced less harmonic output. However, non-linear loads installed in the system will causes increasing of harmonic. Thus, this project is about implement a single phase APF based on FFT to filter the harmonic and directly improve the power quality. The performance of APF based on FFT was evaluated in term of total harmonic distortion at line current with connection to the R, RL, RC and rectifier loads. The MATLAB/Simulink simulation has been used in this project in order to simulate and prove that the FFT technique is capable to reduce the harmonics generated by loads. At the end of this project, the performances of APF based on FFT technique were analysed. The simulation result shows that by injecting APF in the system, the THD line current was improved below than 5% even though THD load current show the high percentage of THD. In addition, the simulation result shows that THD line current of Unipolar MLI with R load and rectifier indicate lower percentage of THD at 0.24% after APF based on FFT technique was applied. The highest THD line current after injecting APF is trinary MLI with RC load and rectifier which is 4.81% and it still under the limit of IEEE 519 harmonic standard.

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