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Thyristor전력변환기-전동기계의 무효전력의 처리에 관한 연구
유철로 대한전기학회 1982 전기의 세계 Vol.31 No.1
As a method for improving the power factor and the waveform of ac line current drawn by ac to dc converters, converters of pulse-width control type with forced commutation circuits have been developed in recent years. However, these converters have rather complex commutation circuits which contain auxiliary thyristors in addition to the main thyristors, and their performance is not satisfactory. This paper proposes a new pulse-width controlled ac to dc converter, and analyses its commutation mechanism and its input and output characteristics. The proposed converter circuit consists of a usual thyristor bridge circuit with series diodes to which reactors and diodes are added. This circuit dose not contain auxiliary thyristors, and in this sense it is simpler than the previous converter circuits of pulse-width control type. Since the main thyristors of the converter can be forcedly turned off several times in a half cycle of source voltage, a pulse-width modulation control is possible in order to improve the current waveform as well as the power factor on ac line side. As to dc output side it is shown that the adjustable range of output voltage is wide and the voltage regulation is good due to a rapid reversal of voltage across the commutating capacitors by LC resonance during commutation period. It is also shown that the regenerative operation of the converter is possible.
유철로,김홍규,이공희,이성룡 全北大學校 1992 論文集 Vol.34 No.-
A new multiple current source inverter for reducing the harmonics in output current is presented in this study. Condenser capacity necessary for the inverter design is decided by the commutation analysis of current source inverter with induction motor as load. And the proposed system operates 24 phase inverter by adding only tap changing circuit which consists of several taps and static switching elements to the 12 phase inverter, which is the double connected 6 phase inverter with an interphase reactor. Also to optimize the effectiveness of the harmonic reduction, the optimum turn ratio and tap changing control angle of interphase reactor are decided by digital simulation and its validity is verified with experiment. And under the optimum condition, it is clarified that the harmonics components involved in the output currents of the proposed inverter are nearly equal to those of the conventional 24 pulse inverter.
유철로,김동용,윤창훈 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.4
새로운 능동 소자인 DDA와 이를 이용한 차동적분기를 설계하였다. DDA는 기존의 OP-AMP로 구성된 응용 회로의 설계시 외부 소자의 정합 문제를 개선할 수 있다는 장점을 갖는다. DDA의 설계는 트랜스컨덕턴스 소자인 differential pair를 이용하여 $2{\mu}m$ 설계 규칙에 맞게 하였다. 이 DDA의 성능을 평가하기 위하여 전압 인버터와 레벨 쉬프터로 구성하여 특성을 고찰한 결과 우수함을 입증하였다. 그리고 CMOS DDA를 이용하여 접지 저항의 모의와 차동적분기를 설계하였고, DDA 차동적분기의 특성이 OP-AMP 차동적분기의 특성을 일치함을 알 수 있었다. 또한 설계된 CMOS DDA와 DDA 차동적분기를 MOSIS $2{\mu}m$ CMOS 공정 기술을 적용하여 layout 하였다. The DDA of new active element and the DDA differential integrator are designed. The DDA can be improved matching problems of external elements in op-amp application circuits. The design of DDA is used the transconductance element, differential pair and $2{\mu}m$ design rule. In order to evaluate the performance of the CMOS DDA, we simulated the DDA voltage inverter and the DDA level shifter using the designed CMOS DDA. Furthermore, the grounded resistor and the differential integrator is designed using the CMOS DDA and we found that its characteristics are agreed to OP-AMP differential integrator's. We performed the layout of the CMOS DDA and DDA differential integrator with MOSIS $2{\mu}m$ CMOS technology.
단상 전류형 정류회로의 입력 전류파형 개선을 위한 새로운 방법
유철로,한우용,이수원 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
A novel method to improve the waveform of the input current in a single phase rectifier circuit is presented in this paper. This is similar to the tap changing method for reducing the harmonic involed in the input current of the three phase rectifier circuit The proposed system operates the multi-pulse single phase rectifier by adding only tap changing circuit which consists of one condencer and one interphase reactor with two taps and SCRs to the conventional current source single phase rectifier circuit. And to optimize the effectiveness of the harmonic reduction, the optimum turn ratio and tap changing control angle of interphase reactor are decided by computer simulation and its validity is verified with experiment.
유철로(Yu Chul-Ro) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
저탄소전력시스템에서 자연에너지의 유효이용과 전력의 안정공급이 요구되고 있다. 저탄소 전력시스템을 조성하기 위한 방법은 다양하나 그 중에서 발전 시에 온실효과 가스를 배출하지 않는 원자력이나 태양광발전 등 저탄소 전력시스템의 비율을 높이는 것이다.