Simulation Of Three-Phase Harmonics Filter

Mohd Fazruf , Mohd Afandi (2005) Simulation Of Three-Phase Harmonics Filter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is mainly about doing simulations using MA TLAB software to filter harmonics which are found in the electrical utility system. Harmonics are caused by unbalanced loads in power systems. To reduce these harmonics effects, an effective filter system is needed. Among the types used are band-pass filters which block low harmonics such as 3rd, 5th, 7th order and etc harmonics and also harmonics of higher order with a large frequency range. There are two types of filters that are usually used, passive and active filters. This project focuses on analysis of three-phase 12-pulse rectifier using passive filter to eliminate the harmonics. The three- phase 12-pulse rectifier are also known as dual converter and are widely used in high power application such as for de motor application and de transmission lines. This converter is normally supplied with the combinations ofY-Y and Y-/1 transfomers. The purpose using the transfomers is to reduce the 5th, 7th, 9th and the other harmonics except harmonics of the 3rd, lith, 13th and 24th order. Due to this condition, the passive filters will filter the 3rd, 1 1 th, 13th and 24th harmonics only. The harmonics filtering method is done using a double tuned type filter (for harmonics 11th and 13th), high pass (for 24th harmonic) and c-type high pass (for 3rd harmonics). Apart from that, the three phase rectifier in this project has a power factor of about 0.7. Therefore, power factor correction also needs to be done to inprove the power factor of the system. From this project, it is found that the harmonics percentage is improved from 10.62% to 3.50%

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