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PMSG 적용 가변속 계통연계형 풍력발전 시스템의 통합 시뮬레이션 및 스위치 개방고장 진단기법 연구
김경화(Kyeong-Hwa Kim),송화창?(Hwa-Chang Song),최병욱(Byoung-Wook Choi) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.3
To analyze influences under open fault conditions in switching devices, an integrated simulation and condition monitoring scheme for a permanent magnet synchronous generator (PMSG) based variable speed grid-connected wind turbine system are presented. Among various faults in power electronics components, the open fault in switching devices may arise when the switches are destructed by an accidental over current, or a fuse for short protection is blown out. Under such a faulty condition, the grid-side inverter as well as the generator-side converter does not operate normally, producing an increase of current harmonics, and a reduction in output and efficiency. As an effective way for a condition monitoring of generation system by online basis without requiring any diagnostic apparatus, the estimation schemes for generated voltage, flux linkage, and stator resistance are proposed and the validity of the proposed scheme is proved through comparative simulations.
수도권 전압안정도 향상을 위한 100MVA STATCOM 위치선정 연구
張秉勳(Byung-hoon Chang),金守烈(Soo-yel Kim),韓正烈(Jeong-yeol Han),崔燉根(Don-keun Choi),宋和昌(Hwa-Chang Song),李炳峻(Byong-Joon Lee) 대한전기학회 2007 전기학회논문지 Vol.56 No.9
This paper reports a study on determination of the adequate location of 100 MVA STATCOM regarding the transfer capability enhancement on the metropolitan interface as well as the economy in system operation. The base case in the study was established considering a scenario of the energy support to North Korea from the KEPCO (Korea Electric Power Corporation) system through a HVDC interconnection. In the base case, the energy support was approximately modeled with a load of 1500 ㎿, and by the load addition, the system was weakened in terms of voltage stability and transfer capability. After a thorough investigation on the case, the location of the STATCOM was decided to compensate the reactive deficit of the modified system and to maximize the operational benefit which can be estimated by FV analysis.