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Design of Superconducting Magnets for a 600 kJ SMES
박명진,곽상엽,이승욱,김우석,한승용,최경달,한진호,이지광,정현교,성기철,한송엽,Park, M.J.,Kwak, S.Y.,Lee, S.W.,Kim, W.S.,Hahn, S.Y.,Choi, K.D.,Han, J.H.,Lee, J.K.,Jung, H.K.,Seong, K.C.,Hahn, S.Y. The Korean Superconductivity Society 2006 Progress in superconductivity Vol.8 No.1
The design of superconducting magnets for a 600 kJ SEMS was discussed. The basic constraint conditions in the design of a 600 kJ SMES magnet were V-I loss(<1 W), inductance of magnet(<24 H), the number of Double Pancake Coils(DPC about 10), the number of turns of DPC(<300), outer diameter of DPC(close to 800 mm) and total length of HTS wire in a DPC(<500 m). As a result of optimum design, we obtained design parameters of the 600 kJ SMES magnet with two operating currents, 360 A and 370 A, which are in the limited conditions without V-I loss. V-I loss of each operating current was calculated with design parameters and V-I characteristic of the HTS wire. As a result of calculations, V-I losses with operating currents of 360 A and 370 A were 0.6 W and 1.86 W, respectively. Even though all design parameters of the SMES magnet in case of operating current of 360 A were in the restricted conditions, V-I loss of SMES magnet showed a tendency to generate at local DPCs, which are located on the top and the bottom of the SMES magnet more than that of the other DPCs.
구간 시변 지연을 고려한 전환 멀티-에이전트 시스템에 대한 일치 제어
박명진(M. J. Park),권오민(O. M. Kwon),이상문(S. M. Lee),박주현(Ju H. Park),차은종(E. J. Cha) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.5
This paper considers multi-agent systems with interval time-varying delays and switching interconnection topology. By construction of a suitable Lyapunov-Krasovskii"s functional, new delay-dependent consensus control conditions for the systems are established in terms of LMIs (Linear Matrix Inequalities) which can be easily solved by various effective optimization algorithms. One numerical example is given to illustrate the effectiveness of the proposed methods.
154 ㎸/5 MVA 고온 초전도 변압기의 권선구조에 따른 교류손실
최지훈(J. Choi),이승욱(S. Lee),김우석(W. Kim),박명진(M. Park),이지광(J. Lee),최경달(K. Choi) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
초전도 변압기의 권선에서 발생하는 교류손실은 시스템의 효율과 안정성에 큰 영향을 미친다. 본 논문에서는 고온 초전도 변압기의 권선 구조에 따른 교류손실과 % 임피던스 특성을 살펴보았다. 변압기 철심의 형태가 내철형과 외철형인 경우에 대하여 설계를 하였으며 각 형태에 따른 교류손실과 % 임피던스를 계산하였다. 154 ㎸/5 MVA 고온 초전도 변압기의 두 가지 철심 형태의 해석을 통해 각각의 특성을 비교하였다.
최지훈(J.H. Choi),이승욱(S.W. Lee),박명진(M.J. Park),김우석(W.S. Kim),최경달(K.D. Choi) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
We have proposed a 100 MVA, 3 phases, 154 ㎸ class HTS transformer which will substitute for 60 MVA conventional transformer. In this paper, we designed conceptually the structure of the superconducting windings of a single phase 33 MVA transformer. The power transformer of 154 ㎸ class has a tertiary winding besides primary and secondary windings. So the HTS transformer should have the 3rd superconducting winding, it makes the cost of the HTS transformer high and the efficiency low. Further more we considered On Load Tap Changer (OLTC) in HTS power transformer. OLTC equipment is required for fitting to a power transformer by which the voltage ratio between the windings can be varied while the transformer is on load. We analyzed the electrical characteristics of the HTS transformer such as magnetic stress and AC loss.