http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Zigbee 무선통신을 이용한 UPS DC링크 커패시터의 고장 모니터링 시스템 개발
김동준(Dong-Jun Kim),손진근(Jin-Geun Shon),전희종(Hee-Jong Jeon) 대한전기학회 2012 전기학회논문지 P Vol.61 No.1
Electrolytic power capacitors have been widely used in power conversion system such as inverter or UPS because of characteristics of large capacitance, high-voltage and low-cost. The electrolytic capacitor, which is most of the time affected by the aging effect, plays a very important role for the power-electronics system quality and reliability. Therefore it is important to diagnosis monitoring the condition of an electrolytic capacitor in real-time to predict the failure. In this paper, the on-line remote diagnosis monitoring system for UPS DC link electrolytic capacitors using low-cost single-chip zigbee communication modules is developed. To estimate the health status of the capacitor, the equivalent series resistor(ESR) of the component has to be determined. The capacitor ESR is estimated by using RMS computation using BPF modeling of DC link ripple voltage/current. Zigbee-based hardware experimental results show that the proposed remote capacitor diagnosis monitoring system can be applied to UPS successfully.
誘導電動機 驅動을 위한 PWM인터버 制御回路에 관한 硏究
田喜鍾 崇實大學校 1986 論文集 Vol.16 No.-
This paper is studied for the unipolar modulation method in P.W.M. inverter by the power transistor. The P.W.M. inverter is used to a power source for A.C motors in variable speed applications and for other uses where a sinusoidal outpout of variable amplitude and variable frequency is needed. The advantage of the unipolar modulation strategy is that no special measures are needed to prevent a "short" danger in the power inverter. Therefore it's strategy is simple and it's output waveform is similiar to the bipolar strategy. Practically, the results obtained by this method are 1) the speed control of the induction motor is capable of a wide range and is a good agreement with the value of the theory 2) the harmonic components are decreased.