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도시철도 직류 전력량 계측을 위한 직류용 스마트미터링 시스템 개발 및 성능시험
정호성(Hosung Jung),신승권(Seongkuen Shin),김형철(Hyungchul Kim),박종영(Jongyoung Park) 대한전기학회 2014 전기학회논문지 Vol.63 No.5
DC urban railway power system consists of DC power network and AC power network. The DC power network supplies electric power to railway vehicles and the AC power network supplies electric power to station electric equipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement of regenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart metering system for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DC smart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuring standard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in order to install in existing system. DC smart meter possesses function of general intelligent electric power meter, such as measuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring error for 2,000V/50mA, and current sensor showed average 0.21% of measuring error for ±2,000V/±4V in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. In similar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DC smart metering system was confirmed by performance test, and more detailed performance will be verified by further real operation DC urban railway line test.
고무차륜시스템에서의 지락보호를 위한 급전선로 절연과 부극전위와의 영향 분석
정호성(Hosung Jung),신승권(Seongkuen Shin),김형철(Hyungchul Kim),박영(Young Park),조상훈(Sanghoon Cho) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
We have analyzed influence of potential rise in negative bus, which caused by decrease of power feeding line insulation, upon protecting method of DC ground protection device which detecting potential rise between negative bus and ground in order to detect ground fault in the rubber wheel system. For this purpose, we proposed negative potential equation between negative bus and ground and calculated negative potential according to system condition changes by estimating power feeding line insulation changes in steel wheel system and rubber wheel system, and equalizing DC power feeding system when ground fault occurred. Also, in order to estimate negative potential of real system, we modeled the rubber wheel system, and simulated normal status, grounding fault occurrence and power feeding line insulation changes. In normal status, negative potential did not rise significantly regardless of vehicle operation. When ground fault occurred, negative potential rose up over 300V regardless of fault resistance. However, we also observed that negative potential rose when power feeding line insulation dropped down under 1MΩ. In conclusion, our result shows that in case of rubber wheel system unlike steel wheel system, relay will be prevented maloperation and insulation status observation can be ensured when ground over voltage relay will be set 200V ~ 300V.
능동형 전압제어를 통한 교류 전기철도 급전망에 대한 전력손실 분석
정호성(Hosung Jung),김형철(Hyungchul Kim),신승권(Seongkuen Shin),김진호(Jinho Kim),윤기용(Kiyong Yoon),조용현(Yonghyeun Cho) 대한전기학회 2013 전기학회논문지 Vol.62 No.11
This paper compares power losses between voltage controlled before and after using power conversion device in AC feeding system. For this purpose we present voltage control procedures and criteria and model high speed line and train using PSCAD/EMTDC to compare power losses in various feeding condition. Power losses of the simulation result in power control before and after in single point feeding system was reduced maximum 0.37 ㎿(23.8 %) and average 0.23 ㎿(20.5 %) when one vehicle load operates maximum load condition. When three vehicles operate maximum load condition in one feeder section, power losses after voltage control was reduced 1.03 ㎿(49.5%) compared to before voltage control. And, power loss of parallel feeding system is reduced the average 0.08 ㎿(7.2 %) compared to the single feeding system. In conclusion, adaptive voltage control method using power conversion device can reduce power losses compared with existing method.
도시철도 직류 비접지 급전계통에서의 선택 지락보호시스템의 성능평가
정호성(Hosung Jung),김주욱(Joouk Kim),신승권(Seongkuen, Shin),김형철(Hyungchul Kim),안태풍(Taepung An),윤준석(Junseok Yun) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
This paper presents to verify the selective grounding fault protective relaying technique for the ungrounded DC traction power supply system. This system selectively blocks fault section when grounding fault occurred. In order to perform this verification, field test facilities have been installed on Oesam substation and Worldcup-Stadium substation, and field test process has been suggested. Also, selective grounding fault protective relaying components and rail voltage reduction device have been tested with the various trial examinations. In order to compare and evaluate performance of the selective grounding fault protective relaying function, field test system was modeled and the system fault simulation results were compared and evaluated with the field test result. Performance of selective grounding fault protective relaying function was evaluated with the above-mentioned process, and the fact that the system recognizes fault section irrespective of insulation between rail and ground and fault resistance from grounding fault.