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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.
OPAL-RT 기반의 Hardware-in-the-Loop Simulation (HILS) 시스템을 이용한 독립운전모드 마이크로그리드 시뮬레이션
유형준(Hyeong-Jun Yoo),김학만(Hak-Man Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
A microgrid is a small scale power system. The microgrid is operated in two operation modes, the grid-connected mode and the islanded mode. In the islanded mode, the frequency of a microgrid should be maintained constantly. For this, the balance between power supply and power demand during islanded mode should be met. In general, energy storage systems (ESSs) are used to solve power imbalance. In this paper, the frequency control effect of a Lithium-ion battery energy storage system (Li-ion BESS) has been tested on the hardware-in-the loop simulation (HILS) system environment.
3상/단상 BTB 전압형 컨버터 기반의 전기철도 급전 시스템의 전압제어 향상을 위한 BESS 적용
유형준(Hyeong-Jun Yoo),신승권(Seungkwon Shin),정호성(Hosung Jung),김학만(Hak-Man Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.11
The scott transformer changes three-phase power to two single-phase power. However, this method causes unbalance and fluctuation of voltage by the change of electric railload. Recently, the AC railway system based on 3?/1? back-to-back (BTB) voltage source converter (VSC) has been proposed to solve these problems. Meanwhile, battery energy storage system (BESS) is used to compensate voltage instantaneously in power system. In this paper, BESS application to the AC railway system based on 3?/1? BTB VSC is suggested to compensate voltage instantaneously. The application effect is shown through simulation using MATLAB/SIMULINK.