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학술대회 Power Conditioning System with Seamless Mode Transition for Microgrid Island Operations
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허세완, 한진수, 박완기
International Systems Conference (SysCon) 2018, pp.706-711
18PH1400, 커뮤니티에너지공급(CES) 시설 기반 분산자원 활용 마이크로그리드 BM 개발 및 실증, 박완기
This paper proposes a design of power conditioning system (PCS) and microgrid island operations which is based on the PCS. The microgrid can be islanded from a utility grid and can be connected to the grid seamlessly after phase detection and synchronization to the grid through a phase-locked loop and a slew-rate controlled synchronizer, respectively. There are three microgrid operations based on the PCS. The microgrid detects a grid failure and switches fast to an island in the protection mode. On the other hand, it changes the operation mode smoothly through a stabilization period in the auto-island mode. The microgrid can also be an island through matching the supply and load during connection to the grid in the zero-energy mode. The function and performance of the PCS were verified though simulations with the PSIM tool. The PCS detected the grid failure and islanded successfully within 1 ms. Moreover, there was no influence on the load through the seamless mode transition.
KSP 제안 키워드
Grid failure, Island mode, Operation modes, Phase Detection, Phase locked loop(PLL), Protection mode, Slew Rate, Zero-energy mode, microgrid operations, mode transition, power conditioning system