| Summary: | 碩士 === 國立臺灣大學 === 電機工程學研究所 === 90 === Because a bulk smoothing capacitor is usually installed on the DC side of many AC to DC converters, the characteristics of harmonic loads will be changed by this capacitor. Nowadays, shunt active power filters can’t reduce harmonics effectively for this voltage type harmonics-producing load. Therefore, in this thesis, a series active power filter (APF) is designed to meet the requirement of voltage-sourced harmonic loads. Both source current and load voltage are detected in order to reach the compensation voltage for the series APF.
The other objective is to use series type active power filter for load voltage regulation. A novel algorithm based on synchronous axis transformation method is proposed to calculate the reference signal for the compensation voltage in a very efficient manner. The designed series type APF can be used to compensate for voltage sag, and voltage unbalance very effectively.
A new digital signal processor (DSP) based control method for active power filter is presented. Compared to conventional analog and microprocessor based methods, the DSP based solution provides a flexible and cheaper method to control the APF. The PSCAD simulations and experiments using the DSP controller are performed to verify the effectiveness of series active power filter in reducing harmonic currents and regulating load voltage.
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