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전압 안정도 제약계통에 대한 고온초전도 케이블 적용효과
이근준,황시돌,Lee, Geun-Joon,Hwang, Si-Dol 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.5
본 논문은 전력계통의 전압 안정도 제약 문제를 해결하는데 고온 초전도 케이블을 적용하기 위한 기법을 제시하였다. 대전력계통의 유효 송전용량은 종종 전압 안정도 제약에 의해 결정된다. 기존의 초전도 케이블 응용 연구는 주로 도심지역의 고밀도 전력 수송 문제를 해결하는 대안으로 연구의 초점을 두어왔지만, 고온 초전도 케이블의 선로정수 개선효과를 이용하면 전압 안정도로 제약된 계통의 송전용량을 증가시킬 수 있어 그 응용 범위가 확대될 수 있다. 전압 안정도에 의한 최대 수송전력을 결정하는 데는 IPLAN에 의한 P-V곡선을 이용하였고, 대체 대상선로는 부하 증가시 무효전력 손실감도가 가장 큰 선로로 하였다. 결과의 타당성을 검증하기 위해 IEEE 14모선 계통을 사용하였으며, 적용결과 Case II는 70[%], Case III에서는 160[%]의 추가 수송 능력 증가를 가져올 수 있었다. This paper presents the basic application idea of superconductor cable for voltage stability limited power system. In bulk power system, the transfer capability of transmission line is often limited by the voltage stability, and superconductor cable could be one of the countermeasure to enhance heat transfer limit as well as voltage stability limit. Steady state voltage stability approach by P-V curve is used to calculate the maximum transfer capability of initial system and superconductor applied system. IEEE-14 bus system is used to demonstrate its applicability.
초전도 케이블의 Quench 특성에 대한 계통안전성 제어방식
이근준,황시돌,Lee, Geun-Joon,Hwang, Si-Dol 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.6
본 논문은 고온 초전도 케이블을 전력계통의 송전용량 증대를 위해 적용시켰을 경우, 고장발생시 초전도케이블에서 예상되는 ??????치의 영향에 대해 안전하게 제어할 수 있는 방법을 제시하였다. 접근 방법으로는 초전도케이블의 ??????치 특성을 열평형 방정식으로 모델링하고 그 결과 고장전류에 따른 케이블의 설계 최대 온도상승한계에 도달하는 시간을 산출하여 기존의 보호계전시스템의 차단시간과 비교함으로서 안전성 여부를 판정하였다. ??????치발생 고장시간을 모의하기 위해 초전도케이블용 EMTDC모형을 개발하였으며, 모의 결과 초전도 케이블 계통을 보호할 수 있는 안전성 제어방식이 설계 가능함을 보였다. This paper presents the basic quench protection idea for the HTS(High-Temperature Superconducting) cable. In Korea power system, the transfer capability of transmission line is limited by the voltage stability, HTS cable could be one of the countermeasure to enhance the transfer limit with its higher current capacity and lower impedance[1]. However, the quench characteristic makes not only HTS cable to loss its superconductivity, but also change the impedance of the transmission line and power system operating condition dramatically. This pheonominum threats HTS cable safety as well as power system security, therefore a proper protection scheme and security control counterplan have to be established before HTS cable implementation. In this paper, the quench characteristics of HTS cable for the fault current based on heat balance equation was established and a proper protection method regarding conventional protection system was suggested.
마용호,이주영,류경우,손송호,황시돌,Ma, Yong-Hu,Li, Zhu-Yong,Ryu, Kyung-Woo,Sohn, Song-Ho,Hwang, Si-Dol 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
The AC loss is an important issue in the design of the high temperature superconductor (HTS) power cables and fault current limiters. In these applications, a cylindrical HTS conductor is often used. In commercialization of these apparatuses, AC loss is a critical factor but not elucidated completely because of complexities in its measurement, e.g. non-uniform current distribution and phase difference between currents flowing in an individual HTS tape. We have prepared two cylindrical conductors composed of a Bi-2223 tape with different critical current density. In this paper, the AC loss characteristics of the conductors have been experimentally investigated and numerically analyzed. The result show that the measured losses for two conductors are not dependent on both arrangements and contact positions of a voltage lead. This implies that most of loss flux is only in the conductors. The loss for the Bi-2223 conductor with low critical current density is in good agreement with the calculated loss from Monoblock model, whereas the loss measured for the Bi-2223 conductor with high critical current density doesn't coincide with the loss calculated from the Monoblock model. The measured loss is also different from numerically calculated one based on the polygon model especially in low transport current.
이근준(Geun-Joon Lee),황시돌(Si-Dol Hwang),이정필(Jeong-Phil Lee),김창현(Chang-Hyun Kim),박희철(Hye-Chul Park) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.11월
This paper presents the basic quench protection idea for the HTS(High-Temperature Supeconducting) cable. In Korea power system, the transfer capability of transmission line is limited by the voltage stability, and HTS cable could be one of the countermeasure to solve the transfer limit as its higher current capacity and lower impedance[1]. However, the quench characteristic of HTS cable makes HTS cable to loss its superconductivity, and therefore change the impedance of the line and power system operating condition dramatically. This pheonominum threats not only HTS cable safety but also power system security, therefore a proper protection scheme and security control counterplan have to be established before HTS cable implementation. In this paper, the quench characteristics of HTS cable for the fault current based on heat balance equation was established and a proper protection method by FCL(Fault Current Limiter) was suggested.
이근준(Geun-Joon Lee),황시돌(Si-Dol Hwang),이소영(So-Young Lee),변찬근(Chan-Geun Byun) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
This paper presents the basic application idea of superconductor cable for voltage stability limited power system. In bulk power system, the transfer capability of transmission line is often limited by the voltage stability, and superconductor cable could be one of the countermeasure to enhance heat transfer limit as well as voltage stability limit. Steady state voltage stability approach by P-V curve is used to calculate the maximum transfer capability of initial system and superconductor applied system. IEEE-14 bus system is used to demonstrate its applicability.
실계통적용을 위한 22.9㎸ 배전용 초전도케이블의 보호방식 검토
이근준(Geun-Joon Lee),이현철(Hyun-Chul Lee),황시돌(Si-Dol Hwang),양병모(Byeong-Mo Yang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Presently, installation and operation of HTS cable has being progressed to replacement of conventional power cable. It was appeared different characteristic between conventional cable and HTS cable on power system. A protective method of HTS cable has being need on conventional power system. In this study, it was compared with conventional cable and HTS cable protective method on real distribution power system of metropolitan area. it was considered for protective method that HTS cable is plan to installation in ICheon substation power system. The HTS cable was considering protective cooperation. HTS cable have been studying for magnitude of fault current and time by overcurrent relay, and difference between input and output by differential relay, and temperature change by thermal relay. HTS cable was simulating line-to-ground fault on unbalanced and three line-to-ground fault on balanced.
변압기 임피던스 증가에 의한 배전계통의 고장전류 저감방안의 영향분석
이현철(Hyun-Chul Lee),이근준(Geun-Joon Lee),현옥배(Ok-Bae Hyun),황시돌(Si-Dol Hwang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper presents the brief analytical study on 돋 effects of higher impedance transformer(HIT) to reduce distribution system fault current. With the increase of source and load capacity of power system, fault current of D/L is much more increased and, conventional protection equipment-such as sectionalizer and recloser, have to be replaced higher switching capacity. However, this replacements needs a lot of budget to utility. Increase of transformer impedance is can be a countermeasure in practical basis. This paper compares the voltage and fault current magnitude of both cases -%Zt=20% and %Zt2=33.3%(transformer capacity is 75/100MVA). The simulation results show that the steady state voltage of HIT is dropped 5~6% more in peak load, and fault current was decreased about 5kA by high impedance on transformer.