전력변환장치의 직류 파형 개선을 통한 고조파 저감
Harmonics reduction by accuracy of DC shaping of power converters
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초록
현재 LNG 운반선, 쇄빙선 등의 특수선박과 해양플랜트에 설치되는 전력변환 장치에는 다이오드를 이용하는 정류기가 많이 사용된다. 하지만 정류에 의한 비선형 부하의 입력전류에 많은 고조파가 포함되어 공급 전압파형의 왜곡을초래한다. 전압파형의 왜곡은 발전기, 변압기, 부하기기 등의 오동작과 전력품질을 저하시키게 된다. 본 논문에서는 정류기 사용시의 전류왜곡을 감소시키기 위해서 직류 파형 정형화 회로를 사용하여 개선함으로써 부하에 인가되는 교류 파형을 정확한 정현파로 만든다. 그 결과 전력계통의 전류와 전압 파형에 포함되는 고조파를 저감할 수 있으며 이를 시뮬레이션을 통해 입증한다.
Abstract
Recently, power converters installed on the specialized vessels such as LNG Carrier and Icebreaker and offshoreplants mainly use diode rectifier. However, such devices cause distortion of supply voltage waveform by involving much harmonicsto input current of non linearity load in rectifying operation. Distortion of supply voltage waveform can bring problemssuch as false operation of generator, transformer and load device and deterioration of power quality. This thesis is focusing onproducing accurate sinusoidal AC waveform through improvement of distortion of current waveform causing under operation ofrectifier by using accurate circuit of DC shaping. The result of computer simulation proved that harmonics involved in current and voltage waveform of power system can bereduced.
참고문헌 (11)
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