| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士班 === 94 === Owing to the development of high technology, power device and power electronic device are widely used in the industry, which deteriorates the problem of harmonic and results in wrong operation of equipments and devices. The most common way to reduce harmonic distortion is to install the harmonic filters. Filters are divided into both active and passive types. Active filter does not meet the requirement of low cost consideration due to the high cost and complex construction and maintenance. Passive filter, however, because of its simple construction, convenient maintenance and cheaper cost, is widely adopted. This thesis utilizes the PSO algorithm to design the passive filter for the harmonic problems. According to the harmonic standard of Taiwan Power Company, system variation, manufacturing tolerance and temperature tolerance of capacitor and manufacturing tolerance of inductance are used to curb harmonic limit condition and to prevent series resonance, which cause the burning down of filters. This context also considers the cost and lifetime of filters as the object function. This study takes a low voltage distribution system as an example, using Matlab/Simulink software simulation to mount 5th, 7th and 11th of filters and get the results. In addition, this thesis compares the ant algorithm and immune algorithm and use optimal techniques to make the results perfect and practical, which prove the effective functions come up with by this context.
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