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YBCO소자의 연결방법에 의한 자속구속형 초전도 한류기의 퀜치특성의 향상
鄭壽福(Soo-Bok Chung),朴炯旼(Hyoung-Min Park),崔孝祥(Hyo-Sang Choi) 대한전기학회 2008 전기학회논문지 P Vol.57 No.3
We investigated the quench characteristics of a flux-lock type superconducting fault current limiter (SFCL) depending on the methods of the serial and parallel connections between the superconducting elements. The flux-lock type SFCL consists of two coils. The primary coil is wound in parallel to the secondary coil through an iron core, and the secondary coil is connected to the superconducting elements in series and parallel. In this paper, the analyses of voltage, current, and resistance of the superconducting elements connected in serial and parallel were performed to increase the power capacity of the flux-lock type SFCL. A part of the superconducting elements was not quenched in 2×2 serial connection between the elements and then the power burden of the quenched elements was increased. However the elements with 2×2 parallel connection was all quenched. This means that the power burden of each superconducting element can be reduced under the same conditions. We found that 2×2 parallel connection was more profitable for the current limiting effects and the increase of the power capacity.
50kW급 계통연계형 태양광발전시스템의 시뮬레이터 구현
정병호,박정민,조금배,백형래,정수복,Jeong, Byeong-Ho,Park, Jeong-Min,Cho, Geum-Bae,Baek, Hyung-Lae,Chung, Soo-Bok 한국태양에너지학회 2005 한국태양에너지학회 논문집 Vol.25 No.4
This paper summarizes the results of these efforts by offering a photovoltaic system structure in 50kW middle scale applications installed in Cho-sun University dormitory roof. The combination of photovoltaic system components are interconnected and system monitoring system will be summarized for the purpose of the increasing safety in this article. This paper describes configuration of utility interactive photovoltaic system which generated electric power supplies to dormitory. In order to installing the middle or large scale photovoltaic system, It must investigated the optimal design of system, compute quantity of power generation, economic rate of return and so on. In this paper represent 50kW utility photovoltaic system examination and developed simulation results. The performance of photovoltaic system has been evaluated and analyzed with simulation. The results obtained in this research will be much useful to prior investigation for installing utility interactive photovoltaic system.
Characteristics of Transformer-Type SFCL according to the Connecting Methods of Secondary Coils
趙鎔善(Yong-Sun Cho),崔孝祥(Hyo-Sang Choi),朴炯旼(Hyoung-Min Park),鄭壽福(Soo-Bok Chung) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
We have analyzed operating characteristics of transformer-type superconducting fault current limiter (SFCL) according to the serial or parallel connections of secondary coils with YBa₂Cu₃O? (YBCO) thin films. The turn ratio between the primary and secondary coils was 63:21. Transformer-type SFCL using a transformer with secondary winding of serial or parallel coils could reduce the unbalanced quench caused by differences of the critical current density between YBCO thin films. We found that transformer-type SFCL having serial or parallel connections induced simultaneous quench between the superconducting units. The limiting current in the transformer-type SFCL with a parallel connection was lowered to 30 % compared to the SFCL with a serial connection. In the meantime, when the currents generated in the superconducting units were similar, the voltage value in the parallel connection was 60 % as low as that in the serial connection. However, the voltage generated in the primary winding was some higher. In conclusion, we found that transformer-type SFCL with parallel connection of secondary coils was more effective in fault current limiting characteristics and in the reduction of the consumption power for superconducting units compared to those of the transformer-type SFCL with serial connection of secondary coils.
이성길(Seong-Gil Lee),임홍우(Hong-Woo Llm),조금배(Geum-Bae Cho),정수복(Soo-Bok Chung),백형래(Hyung-Lae Baek) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In order to radiate X -ray, the low ripple stabilized high voltage DC over the range of 40KV to 150KV is directly inflicted to X -ray tube. The energy characteristics of the radiated X -ray depend on the pulsating waveforms of the DC voltage supplied X -ray tube In general, the low ripple voltage waveforms with fast rising times are required to increase with the dosage per unit I1me lest the exposure I1me should be longer in orde that the motion artifacts of an object may be eliminated in actual The conventional types of X -ray generators were bulky in physical size and heavy in weight, and the control accuracies of the output voltages were not always satisfactory. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing new power semiconductor devices. To decreasing the volume and the weight of high voltage transformer, and to stabilize ripple, a high frequency PWM inverter is connected between DC source and high voltage transformer. This paper describes the output characteristics according to stabilize ripple of X -ray tube voltage and compared the reproducibility, direcibility and doesage.
최효상(Hyo-Sang Choi),최창주(Chang-Joo Choi),이상일(Sang-Il Lee),정수복(Soo-Bok Chung),오금곤(Geum-Kon Oh),정헌상(Hun-Sang Chung) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
We analysed the operating properties of resistive type superconducting fault current limiters (SFCLs) based on YBCO thin films with a single line-to-ground fault. When a single line-to-ground fault occurred the short circuit current of a fault phase increased up to about 6 times of transport currents immediately after the fault instant and was effectively limited to the designed current level within 2 ms by the resistance development of the SFCL. The fault currents of the sound phases almost did not change because of their direct grounding system. The unsymmetrical rates of a fault phase were distributed from 6.4 to 1.4. It was found that the unsymmetrical rates of currents were noticeably improved within one cycle after the fault instant. We calculated the zero phase currents for a single line-to-ground fault using the symmetrical component analysis. The positive sequence resistance was reduced remarkably right after the fault but eventually approached the balanced positive resistance component prior to the system fault. This means that the system reaches almost the three-phase symmetrical state in about 60 ms after the fault. The ground currents were almost 3 times of the zero phase currents since most of the fault currents flowed through the grounding line.
정수복 조선대학교 생산기술연구소 1992 生産技術硏究 Vol.14 No.1
This paper is a study on position control of induction motor using sliding mode. Control function in sliding mode is discreate at the sliding line, which caused a problem such as current harmonies and noise at induction motor drive. To reduce this effect, a low pass filter was introduced between sliding mode control output and induction motor control input. Chattering reduced by low pass filter but guality of system get worse at transition because of torgue response of induction motor were slow. To slove this problem, band of filter was variable according to error function. This paper consisted of sliding mode by using microcontroller and validated propriety of compenstion mathod by variable filter through this experimentation.