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태양광전원이 연계된 배전계통 보호협조기기의 부동작패턴 탐색알고리즘에 관한 연구
권순환(Soon-Hwan Kwon),태동현(Dong-Hyun Tae),이후동(Hu-Dong Lee),노대석(Dae-Seok Rho) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.9
최근, 기후변화와 미세먼지 등에 의한 지구규모적인 환경문제를 해결하기 위하여, 정부에서는 RE 3020 정책을 시행하고 있으며, 이에 따라 대용량의 태양광전원이 배전계통에 연계되고 있다. 하지만, 대용량 태양광전원이 배전계통에 연계되는 경우, 태양광전원의 연계위치와 용량, 연계방식 및 고장지점에 따라 사고전류의 크기와 방향이 변하게 되고, 지락사고가 발생하여도 분류효과에 의하여 보호협조기기가 동작하지 않는 부동작 현상이 발생할 가능성이 있다. 따라서, 본 논문에서는 다수의 태양광전원이 배전계통에 연계되어 운용되는 경우, 리클로저(recloser, 이하 R/C)의 설치개소에 따라 보호협조기기가 동작하지 않는 부동작 메커니즘을 제시하고, 이를 바탕으로 다양한 시나리오에 기반한 보호협조기기의 부동작 패턴탐색 알고리즘을 제안한다. 또한, 보호협조 전용 해석 프로그램인 Off-DAS를 이용하여, 다수의 태양광전원이 연계된 배전계통 모델링을 수행하고, 이를 바탕으로 다양한 시나리오에 따른 보호협조기기 부동작 패턴을 분석한다. 제안한 보호협조기기의 부동작패턴 탐색알고리즘 및 모델링을 바탕으로 시뮬레이션을 수행한 결과, R/C의 설치개소 및 태양광전원의 연계 패턴에 따라 부동작 현상이 발생함을 알 수 있어, 본 논문의 유용성을 확인하였다. Recently, the Korean government developed the RE3020 (renewable energy) policy to overcome environmental problems, such as fine dust, climate change, and large-scale PV systems interconnected with a distribution system. When a large-scale PV system is interconnected in the distribution system, however, a malfunction can occur, and the protection devices may not be operated because of the dividing effect depending on the magnitude and direction of fault current as well as connection types and location of the PV system. Therefore, this paper proposes a search algorithm for the malfunction pattern of protection devices based on various scenarios, when large-scale PV systems are operated and interconnected in a distribution system. This paper presents a malfunction mechanism of protection devices according to the installation locations of recloser (R/C). Furthermore, the modeling of a distribution system with large-scale PV systems was performed using Off-DAS S/W, and the malfunction patterns of protection devices were analyzed based on a range of scenarios. From the simulation results with the proposed model and algorithm for searching for protection devices, it was confirmed that they are useful and effective in identifying a malfunction phenomenon depending on the installation location of the R/C and connection type of PV system.
권순환 ( Soon-hwan Kwon ),이수진 ( Sujin Lee ),강대연 ( Daeyoun Kang ),최지선 ( Jisun Choi ),장제윤 ( Jeyoun Jang ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1
Objectives; Hantavax is not yet improved due to absence of prospective randomized controlled study. The analysis of neutralizing antibody is known to the method of guessing of protectiveness of vaccine. To investigate the effectiveness of Hantavax more correctly. we were carried out immunogenicity studies before and after vaccination with Hantavax. Methods; The new solider of 17 and 20 division of Korean army are enrolled in this study. 246 blood samples collected before vaccination and 3 and 6 month after vaccine inoculation. Before and after vaccination, hantaanvirus antibodies in the serum were analyzed by ELISA, IFA, and PRNT in the collected serum. Results; The result of the vaccination status, 246 enrolled persons were able to confirm the vaccination status. In the basic vaccination, second vaccination inoculated at 1 to 3 month intervals from first shot and booster vaccination was inoculated after 7 to 11 months from second vaccination. 20% of persons are vaccinated only once in the training center. According to the results, in the group that was boosted at 7 months after basic vaccination, 37.5% from ELISA and 53.33% from IFA were detected the hantaanvirus antibodies at 6 months after the boosting. The group that was boosted at 11 months after basic vaccination was able to confirm the antibody retention by 75% in EISA and 100% in IFA at 6 months after the boosting. Conclusions; We found problems with vaccination and management of vaccine in the army. It is very important to vaccinate at the correct vaccination guideline. To find this study confirmed that the interval of hantavax vaccination was very important for the vaccine efficacy.
대용량 태양광전원이 연계된 배전선로에 있어서 보호협조기기의 최적 운용알고리즘
권순환(Soon-hwan Kwon),이후동(Hu-dong Lee),남양현(Yang-hyun Nam),노대석(Dae-seok Rho) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.5
최근, 대용량의 태양광전원이 연계된 배전계통은 기존의 단방향과 달리 양방향의 조류가 발생하고, 태양광전원의 연계위치 및 고장위치에 따라 사고전류의 크기와 방향이 변하여, 보호기기간의 협조시간차가 충분히 확보되지 않는 문제점이 발생할 수 있다. 또한, 태양광전원을 고려하지 않은 기존의 보호기기 정정치를 그대로 적용하고 있어 보호기기간의 협조시간차를 확보하기 어려운 상황이 발생하고 있다. 따라서 본 논문에서는 태양광전원이 연계된 선로에서 고려할 수 있는 3가지 Case의 보호기기 정정치 운용모드를 제시하고, 이를 바탕으로 태양광전원의 용량에 따른 최적의 보호협조 시간을 도출할 수 있는 알고리즘을 제안한다. 한편, 이를 바탕으로 보호협조 전용소프트웨어인 Off-DAS를 이용하여, 태양광전원이 연계된 배전계통을 모델링하고, 보호기기(변전소 계전기, 리클로저(Recloser), 고객계전기, 태양광전원 고객계전기)간의 협조시간차 특성을 분석한다. 실 계통을 대상으로 시뮬레이션을 수행한 결과, 본 논문에서 제시한 보호기기의 정정치 운용 모드와 정정치 산정 방식이 태양광 전원이 연계된 배전계통 보호기기간의 협조시간을 안정적으로 확보할 수 있음을 알 수 있었다. If a photovoltaic (PV) system is installed in a primary feeder interconnected with the PV system, bi-directional power flow can occur, and then, the magnitude and direction of the fault current can change, depending on the fault location and point of common coupling (PCC) of the PV system, and the time current curve (TCC) cannot be properly coordinated between protection devices. Also, it is difficult to obtain a proper time interval for protection devices because the conventional setting approach is applied, even though the PV system is installed and operating. Therefore, this paper presents three operation modes considering the operational conditions of the PV system to obtain setting values for protection devices. Based on the mode, this paper proposes an algorithm to calculate the optimal protection coordination time interval according to the introduction capacity of the PV system. In addition, this paper performs modelling of a distribution system with the PV system and protection devices by using Off-DAS S/W, and analyzes the characteristics of the time interval between the protection devices, such as substation relays, reclosers, customer relays, and PV customer relays. The simulation results confirmed that the proposed operational modes and setting-value algorithms are useful and effective for protection coordination in a distribution system for a PV system.
PMSM이 적용된 고속철도 견인전동기 시스템의 전류 및 속도 제어기 설계
진강환(Kang-Hwan Jin),이두희(Du-Hee Yi),권순환(Soon-Hwan Kwon),강정남(Jung-Nam Kang),김윤호(Yoon-Ho Kim) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
This paper presents the current and speed controller design procedure and their performance for the IPMSM based next generation high speed railway system. The next generation high speed railway system is a power distributed type and uses vector control method for motor speed control. Since the speed and current controller gains of the vector control system directly affects to the transient characteristics and speed control capability, the systematic design of the controllers are required. In this paper the controllers are designed using the IPMSM based next generation high speed railway system parameters. Simulation programs based on Matlab/Simulink is developed. Finally the controller characteristics are analyzed by the simulation results.