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김임경(Y. K. Kim),박용정(Y. J. Park),김경렬(K. R. Kim),남궁원(W. Namkung) 한국진공학회(ASCT) 1996 Applied Science and Convergence Technology Vol.5 No.4
PLS 선형가속기 진공계는 콜라이스트론 첨두출력 54 ㎿, 펄스폭 4.1 ㎲, 반복율 10 ㎐의 마이크로파 전력 공급상태에서 2.6×10^(-6) Pa의 진공도를 유지하고 있으며, 45℃ 운전조건에서 마이크로파 전력이 공급되지 않았을 때 진공도는 2.4×10^(-6) Pa이다. 설치 초기에 30×10^(-11) Torr-l/sec-㎠ 이었던 가스방출율은 각 가속단위마다 약 140 GJ의 마이크로파 에너지가 전파된 현재 1×10^(-12) Torr-l/sec-㎠ 이다. 주 장비로 사용중인 이온펌프는 모두 포화된 상태이며 60 l/s, 120 l/s, 230 l/s 이온펌프의 유효배기속도는 운전 영역에서 각각 45 l/s, 65 l/s, 140 l/s 이다. 진공계 운전중 야기된 문제점들로는 이온펌프 및 진공 게이지 전원제어기의 오동작, 에너지 배가장치의 출력창, 전자총 및 가속관 종단부하의 진공누출 등이었다. 최근 일년간 총 41회에 140.8시간운전 중지를 경험하여 98%의 가용도 (availability)를 나타내었다. 추후 시험중인 도파관 밸브와 개발중인 가속관 종단부하가 설치된다면 가용도를 99.5% 이상으로 증가시킬 수 있을 것으로 기대한다. The vacuum system of PLS linac provides average pressure of 2.6×10^(-6) Pa under high power microwave loading of 54㎿ peak with 4.1 ㎲ pulse width and 10㎐ repetition rates. The base pressure of system is 2.4×10^(-6) Pa with 45°C cooling water. The outgassing rate of the system is decreased from 3×10^(-11) Torr-l/see-㎠ at the initial stage after installation to 1×10^(-12) Torr-l/see-㎠ at present. Total accumulated microwave energy dose is about 140 GJ per module. All ion pumps are working under saturated regime and effective pumping speeds of 60 l/s, 120 l/s, 230 l/s ion pumps are 45 l/s, 65 l/s, 140 l/s under the operating range. Main problems occurred in recent year are troubles of ion pump controller and vacuum gauge controller, vacuum leak of energy doubler window and electron gun ceramic, and water leak in the dummy load of accelerating columns. Total of 41 troubles with 140.8 hours down time give good system availability of 98%. Down time can be reduced by high power waveguide valves and water dummy loads under development, and then availability is expected to be increased up to 99.5%.
Conceptual Design of PLS-II Control System for PLS
J.C. Yoon(윤종철),J.W. Lee(이진원),E.H. Lee(이은희),H.G Ha(하기만),J.M. Kim(김재명),S.J. Park(박성주),K.R. Kim(김경렬) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
PLS(Pohang Light Source) will begin the PLS-Ⅱ project that has been funded by the KOREA Government in order to further upgrade the PLS which has operated since 1992. The control system of the PLS-II has distributed control architecture, with two layers of hierarchy; operator interface computer (OIC) layer and machine interface computer (MIC) layer. The OIC layer is based on SUN workstation with UNIX. A number of PC-based consoles allow to remotely operating the machine from the control room. PC-based consoles use the Linux or Windows operation system. Similar consoles in the experimental hall are used to control experiments. The MIC layer is directly interfaced to individual machine devices for low-level data acquisition and control. MIC layer is based on VMEbus standard with vxWorks real-time operating system. Executable application software modules are downloaded from host computers at the system start-up time. The MIC's and host computers are linked through Ethernet network. It should enable the use of hardware and software already developed for specific light source requirements. The core of the EPICS (Experimental Physics and Industrial Control System)[1] has been chosen as the basis for the control system software.
Mechanical Design of a 750 ㎾ Direct - drive Wind Turbine Generator System
손영욱(Y. U. Sohn),손정봉(J. B. Son),박인수(I. S. Park),김영찬(Y. C. Kim),김경렬(K. R. Kim),정진화(C. W. Chung),전중환(Ch. H. Chun),류지훈 박지훈(J. Y. Ryu),박진일(J. I. Park),변철진(C. J. Byun),김두훈(D. H. Kim) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
A prototype of 750 ㎾ direct-drive wind turbine generator system, KBP-750D is under development in Korea. For the gearless, direct-drive prototype a synchronous generator with permanent magnets has been developed. The upwind 3-blade type machine employs variable speed and pitch control. The operating ranges of wind and rotor speed are 3 to 25 m/s and 9 to 25 rpm, respectively. The tip speed ratio of rotor blade is 7.5, designed for power coefficient 0.47. The blade pitch and torque are controlled with the predefined torque-speed curve according to the conditions of wind and public electric grid. This paper describes the outlines of primary components of KBP-750D.
손영욱(Y.U. Sohn),박인수(I.S. Park),권세진(S.J. Kwon),김영찬(Y.C. Kim),손정봉(J.B. Son),김경렬(K.R. Kim),정진화(C.W. Chung),전중환(J.H. Chun),류지윤(J.Y. Ryu) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Load calculation is indispensable for the construction of a large wind turbine generator system (WTGS). In procedures of load calculation, all conditions affecting to WTGS such as environment of site, operation, transport and installation have to be considered systematically. So the certification of WTGS is issued by assuring the load calculation. This work shows the generals of load calculation briefly and introduces the characteristics and results of load calculations for the 750 ㎾ direct-drive WTGS (KBP-750D) which is under development by the consortium of POSTECH and UNISON.