http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
양병모(Byeongmo Yang),유병우(Byeongwoo Ryu),박종광(Jongkwang Park),김찬기(Chanki Kim),이형한(Hyounghan Lee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
본 논문은 사이리스터를 이용한 HVDC 시스템에서 발생하는 무효전력보상에 대한 특성을 무효전력 발생원인과 보상방법에 대하여 고찰하고자 하였다. HVDC 시스템은 무효전력을 컨버터의 제어를 통하여 한정적으로 보상할 수 있으며, 고조파 제거를 위하여 설계하는 교류필터의 커패시터를 이용하여 무효전력보상기능을 추가하고 있다. 하지만 이러한 방법으로는 완전하게 무효전력을 보상할 수 없으므로 추가적인 무효전력 보상장치를 설계하여야 한다. 그러므로 본 논문에서는 현재 제주-해남에 설치 되어있는 HVDC 시스템을 대상으로 무효전력보상에 대한 시뮬레이션을 하였다. 제주 인버터단의 특성을 고려하여 무효전력보상을 위한 커패시터와 동기 조상기의 Hybrid형 방법에 대하여 동적 특성을 분석하였으며 논문에서 사용된 방법은 PSCAD/EMTDC를 이용한 시뮬레이션을 수행하였다.
Seun Ryul Lee,Jae-young Yoon,Byeongmo Yang,Byongjun Lee IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>The GENI project for applying the 22.9 kV HTS cable and the SFCL to real power system has been progressed in South Korea since 2008. The HTS power devices were applied to the Icheon substation in the real Korean power grid in August 2011. This is the first demonstration of HTS power devices in South Korea. For a successful application, this paper proposes proper specifications of a current limiting resistor/reactor and an activating current for the 22.9 kV SFCL in the Korean power distribution system. These specifications are determined, considering the protection system of real Korean power system.</P>
Protective Relay Tests of Hybrid SFCLs in a Korean Distribution Power System Using RTDS
Seung Ryul Lee,Jae-young Yoon,Jae-ho Kim,Byeongmo Yang,Byongjun Lee IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>A study on protective relay systems is one of the important technical issues concerning power systems that use Superconducting Fault Current Limiters (SFCL). We used a Real Time Digital Simulator (RTDS) in order to study the true interaction of the protection system with the power systems. RTDS modeling of SFCL is necessary to obtain detailed protective relay tests. In this paper, we developed an analysis model using RTDS in order to study the transient behavior of a 22.9 kV hybrid SFCL and performed closed-loop testing on a protective relay in a distribution power system using the developed SFCL model. The model uses an operation mechanism of the real SFCL. The 22.9 kV hybrid SFCL is under development by LSIS (LS Industrial Systems Co., Ltd.) and KEPRI (Korea Electric Power Research Institute) in Korea. The parameters of the model are based on the test data from the real SFCL. Power system planners and operators will be able to solve the problems that are expected in the application of SFCLs to power systems by using these protective relay testing results.</P>
A Novel Multi-Terminal Based Evaluation Method for an HTS DC Power Cable
Jin-Geun Kim,Sung-Kyu Kim,Dinh-Minh Chau,Bo-Geun Jang,Minwon Park,In-Keun Yu,Byeongmo Yang IEEE 2013 IEEE transactions on applied superconductivity Vol.23 No.3
<P>High current capacity is one of the advantages of a superconducting power cable system. However, it creates difficulties when experimenting to analyze its characteristics. Short-length superconducting cables for a laboratory-scale experiment system present problems: large operating current and current distribution by terminal resistance. Experimental conditions, such as transient states, are limited by power supply capacity. In this paper, the authors suggest a new experimental method for the high-temperature superconducting (HTS) power cable to reduce the capacity of a power supply and solve current distribution problems. For the suggested method of this paper, each HTS wire has separated terminal and each HTS wire was connected in series through the separated terminal. All of HTS wires in the HTS power cable are insulated and connected in series. The cross-sectional area of the HTS power cable is the same, but the terminal structure is different. Thus, all HTS wires have the same current and cross-sectional area of HTS power cable. It is possible to test a large capacity HTS power cable under the transient state or fault conditions using a small-size power source. The design concept, configuration of the experiment system, and the experimental results were discussed in detail in this paper.</P>