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유형준(Hyeong-Jun Yoo),김경훈(Gyeong-Hun Kim),전진홍(JinHong Jeon) 대한전기학회 2020 전기학회논문지 Vol.69 No.5
The distributed generations(DGs) such as wind turbine, photovoltaic(PV), fuel cells, and energy storage system(ESS) are normally connected through power conversion system interface to power system. The high penetration of DGs will bring significant challenges to the power system. The power conversion systems have no rotating inertia or damping mechanism, thus the inertia and damping can’t be provided to power system, which makes the power system have a low inertia, and weakness the frequency stability and regulation capability. In addition, there is a constant voltage constant frequency(CVCF) converter in microgrid. So, if a CVCF converter fails, the system can be shut down. In this paper, the virtual inertia was applied to the power conversion system of ESS and PV system for analyzing transient response characteristics when the disturbance occur in microgrids. Especially, when the microgrid operation mode was switched from the grid-connected mode to the islanded mode and CVCF converter fail, the transient response has been compared under with virtual inertia and without virtual inertia. The simulation results are presented using MATLAB/SIMULINK.
BESS 모델링 및 전기철도 급전계통에의 전압보상 적용
유형준(Hyeong-Jun Yoo),손호익(Ho-Ik Son),김학만(Hak-Man Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
The load of electric railroad can generate voltage fluctuation in the electric railway system because of high speed of the electric railroad and frequent movement and stop. This voltage fluctuation of electric railway system can cause not only voltage imbalance but also harmonic in the utility grid. Therefore the electric railroad system is in need of the reactive power compensation, such as static synchronous compensator (STATCOM) and static var compensator (SVC). Especially, the battery energy storage system (BESS) can control the real and reactive power at the same time. In this paper, the electric railway system using BESS has been modeled to show its voltage compensation effect using Matlab/Simulink.
Hardware-in-the-Loop Simulation을 이용한 3-레벨 NPC 전압형 HVDC 시스템 구현 및 테스트
유형준(Hyeong-Jun Yoo),김남대(Nam-Dae Kim),김학만(Hak-Man Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.3
Recently, applications of VSC-HVDC systems to power systems are growing because of their control ability of reactive power. Meanwhile, the hardware-in-the-loop simulation (HILS) based on the real-time digital simulator has been applying to develop and test imbedded controllers and systems in the power industry to decrease costs and to save time. In this paper, a 3-level neutral point clamped (NPC) VSC-HVDC system is modeled and the embedded controllers of the NPC VSC-HVDC system are designed. The designed controllers are implemented by TMS320F28335. The TMS320F28335-based controllers of the NPC VSC-HVDC system are tested using the HILS.
CompactRIO/OPAL-RT를 이용한 실시간 마이크로그리드 시뮬레이터
유형준 ( Hyeong-jun Yoo ),유현재 ( Hyun-jae Yoo ),김학만 ( Hak-man Kim ),임유진 ( Yu-jin Lim ),박재세 ( Jae-se Park ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.1
마이크로그리드는 친환경 독립 전력시스템으로 화석연료에 대한 의존도와 CO2 배출량을 줄일 수 있어, 최근 많은 관심을 받고 있다. 실시간 디지털시뮬레이터를 사용할 경우 시스템 개발 측면에서 시간과 경비를 줄일 수 있는 장점이 있는데, 본 논문에서는 OPAL-RT와 CompactRIO를 이용하여 마이크로그리드의 실시간 시뮬레이터를 구현하여 기초적인 동작을 시험하였다.
독립운전 모드의 마이크로그리드에서 EDLC와 BESS의 주파수 협조제어전략 설계
유형준(Hyeong-Jun Yoo),김학만(Hak-Man Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.6
Since a microgrid has renewable energy sources, imbalance between power supply and power demand occurs in the islanded mode. In order to solve the imbalance, several energy storage systems (ESSs) such as bettary energy storage system (BESS), EDLC (electric double layer capacitor), flywheel, and SMES (superconducting magnetic energy storage) are generally used. Especially, their electrical characteristics are different. For efficient use of them, a coordinated control scheme is required. In this paper, a coordinated control scheme for using a Lead-acid BESS, a Lithium BESS, and a EDLC is designed to efficient frequency control for a microgrid in the islanded mode. The coordinated frequency control strategy is designed based on their electrical characteristics. The feasibility of the proposed coordinated frequency control strategy is verified through the simulation.