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A Novel Centralized Voltage Control to Allocate the Reactive Power in Wind Power Plants
Hwanik Lee,Heewon Shin,Dohyuk Kim,Yongcheol Kang,Byongjun Lee 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
For the stable integration of wind power plants into power system, system operators legislate the integration standards and operating strategies for each wind power plants. Especially, with the connection of large scale wind power plant such as Off-shore wind farm, the plants obligate to support the reactive power during the fault by using PCS(Power Conversion System) control. This paper proposes the centralized voltage control strategy during the fault. The centralized voltage controller allocates the reactive power of wind turbines by using the Qallocation factor based on VQ sensitivity. The algorithm considers not only the reactive capability of wind turbines but also characteristic of wind farm topology. The results show that proposed scheme control the not only POC voltage but also terminal voltage of each turbines. As a result, burden of wind turbine’s converters can be reduced and wind power plant secures the active power without turbines shutdown.
Hybrid Secondary Voltage Control combined with Large-Scale Wind Farms and Synchronous Generators
Jihun Kim,Hwanik Lee,Byongjun Lee,Yong Cheol Kang 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
For stable integration of large-scale wind farms, integration standards (Grid codes) have been proposed by the system operator. In particular, voltage control of large-scale wind farms is gradually becoming important because of the increasing size of individual wind farms. Among the various voltage control methods, Secondary Voltage Control (SVC) is a method that can control the reactive power reserve of a control area uniformly. This paper proposes hybrid SVC when a large-scale wind farm is integrated into the power grid. Using SVC, the burden of a wind turbine converter for generating reactive power can be reduced. To prove the effectiveness of the proposed strategy, a simulation study is carried out for the Jeju system. The proposed strategy can improve the voltage conditions and reactive power reserve with this hybrid SVC.
Hybrid Secondary Voltage Control combined with Large-Scale Wind Farms and Synchronous Generators
Kim, Jihun,Lee, Hwanik,Lee, Byongjun,Kang, Yong Cheol The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.2
For stable integration of large-scale wind farms, integration standards (Grid codes) have been proposed by the system operator. In particular, voltage control of large-scale wind farms is gradually becoming important because of the increasing size of individual wind farms. Among the various voltage control methods, Secondary Voltage Control (SVC) is a method that can control the reactive power reserve of a control area uniformly. This paper proposes hybrid SVC when a large-scale wind farm is integrated into the power grid. Using SVC, the burden of a wind turbine converter for generating reactive power can be reduced. To prove the effectiveness of the proposed strategy, a simulation study is carried out for the Jeju system. The proposed strategy can improve the voltage conditions and reactive power reserve with this hybrid SVC.
칼라분산 기반 확장 스네이크 알고리즘을 이용한 영상 분할 기법
이승태(Seungtae Lee),정환익(Hwanik Chung),한영준(Youngjoon Han),한헌수(Hernsoo Hahn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문은 스네이크 에너지에 칼라분산 성분을 추가함으로써 스네이크 알고리즘을 이용하는 강인한 영상분할기법을 제안한다. 일반적인 스네이크 알고리즘은 영상의 밝기 값만을 고려하여 관심영역을 분할하기 때문에 인접하는 영역과 다른 칼라정보를 갖더라도 인접하는 물체와 유사한 밝기 값을 가지면 영상분할하기 어렵다. 제안하는 알고리즘은 복잡한 배경에서 인접하는 영역과 칼라성분이 다른 관심영역을 효율적으로 분할하기 위해, 기존의 snake 알고리즘에 칼라분산(color variance) 에너지 요소를 추가하였다. 특정 칼라 값을 갖는 물체들이 섞여있는 복잡한 배경 영상들의 실험을 통해 제안하는 칼라분산 기반 확장 스네이크 알고리즘의 우수성을 입증하였다.