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직류 배전시스템용 35kV 8kA Hybrid 직류 차단기 개발
고유란(Yu-Ran Go),민명환(Myung-Hwan Min),안태풍(Tae-Pung An) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
저탄소 녹색성장에 따른 신재생 에너지의 발전에 따라 MV급 직류 배전에서 직류 차단기의 연구가 진행되고 있다. 본 논문에서는 역전류 삽입형 Hybrid 차단기의 토폴로지를 제안하고, 토폴로지의 동작을 설명하며, ±35kV 8kA 성능을 가지는 Hybrid 차단기를 설계하였다. 시뮬레이션을 통해 MVDC 배전망을 간략히 모델링하고, 지락 및 단락 사고를 모의하여 제안한 hybrid 차단기의 동작 특성을 확인하였다.
PSCAD 모델링을 통한 교류철도계통 전압불평형 보상 장치의 유효성 분석에 관한 연구
고유란(Yu-Ran Go),김현우(Hyun-Woo Kim),민명환(Myung-Hwan Min),안태풍(Tae-Pung An),이태훈(Tae-Hoon Lee) 대한전기학회 2020 전기학회논문지 Vol.69 No.10
In AC railway system using single phase power, voltage unbalance for three phase is one of power quality issues. Voltage imbalance affects the life and efficiency of power facilities and devices that receive power from the same three-phase power system. Special transformers are applied to improve these problems, but it does not solve voltage imbalances completely. In this paper, we present the equation of voltage unbalance factor in system applied with scott transformer based on voltage unbalance factor defined in IEC standard. It then used actual measurement data to analyze the voltage unbalance characteristics. And the modeling for AC railway system, voltage unbalance compensation devices similar to actual site and are performed using PSCAD. The simulation was also performed by load modeling with actual measurement data. Through this, the validity of the improvement of the voltage unbalance using the compensation device is analyzed.
국내 기준과 IEC 표준을 적용한 교류철도 급전계통에서의 불평형률 분석
민명환(Myung-Hwan Min),고유란(Yu-Ran Go),안태풍(Tae-Pung An),이태훈(Tae-Hoon Lee),이병곤(Byeong-Gon Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
AC railway system which has a large single-phase AC load causes voltage unbalance. The voltage unbalance can effect to decrease efficiency, life time of installed devices in three-phase supply system. In this paper, the definition of voltage unbalance factor and the limiting value are compared and investigated. Among them, the methods of analysis and evaluation presented by IEC (IEC 61000-3-13) standards are introduced. In addition, the voltage unbalance factor was calculated using the actual measured voltage at the AC railway substations by the methods given in the national and IEC standards. In conclusion, the characteristics of the voltage unbalanced rate in the AC railway system are to be identified.
교류전기철도 부하 불평형 개선을 위한 병렬형 능동형 밸런서 적용에 관한 연구
김현우(Hyun-Woo Kim),고유란(Yu-Ran Go),민명환(Myung-Hwan Min),안태풍(Tae-Pung An),이태훈(Tae-Hoon Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
This paper analyzes an active balancer with parallel structure which can solve the unbalance problem of Scott transformer secondary side load. First, the structure and function of the proposed active balancer system are explained and the inverter hardware design and control algorithm applied to the active balancer are presented. In addition, the interleaving technique applied to the parallel balancer is described. In order to verify the effects of active and reactive power compensation and the interleaving technique, 8 MVA active balancer is designed and confirmed through PSIM simulation.
민명환(Myung-Hwan Min),고유란(Yu-Ran Go),안태풍(Tae-Pung An),이태훈(Tae-Hoon Lee),이병곤(Byeong-Gon Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
This paper carries out the power analysis in case of regenerative power generation in the AC power supply system, which is using the scott transformer. In particular, the three phase power characteristics of the primary side are analyzed numerically according to the single phase power characteristics of the secondary side of the transformer. More specifically, the power characteristics of the three-phase side are presented by classifying the cases according to the conditions of accelerated and regenerative operation of the secondary side of the transformer. In addition, the power characteristics presented in this paper are verified by comparing the values analyzed numerically with those measured at the substation.
교류철도계통의 계측신호 분석을 통한 전압불평형율 및 전압왜형율 처리에 관한 연구
민명환(Myung-Hwan Min),홍재영(Jae-Young Hong),고유란(Yu-Ran Go),안태풍(Tea-Pung An),이태훈(Tea-Hoon Lee) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
In this paper, the existing analysis method for the total harmonic distortion (THD) and the voltage unbalance among power quality is presented. The existing method calculates based on the measured voltage value, but it is difficult to derive only the power quality value of railway operation since the voltage is affected by the commonly connected system. This study proposes a method of calculating the measured current value, power value, and system short-circuit capacity value. In order to verify the validity of the proposed method, the basic method and the proposed method were compared and analyzed based on the actual measured signals in the AC railway substation.