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Lee, Byongjun,Song, Hwachang,Kwon, Sae-Hyuk,Jang, Gilsoo,Kim, Jun-Hwan,Ajjarapu, V. IEEE 2002 IEEE transactions on power systems Vol.17 No.3
This paper reports a study on determining steady. state voltage stability limit of interface flow on a set of interface lines between the metropolitan region and the neighboring regions in the Korea Electric Power Corporation (KEPCO). The interface flow limit considering severe contingencies is determined with a concept of interface flow margin, which is the active power flow margin of the key transmission lines between one region and others under a fixed load demand condition. The paper proposes a procedure to determine secure limit of active power flow on a set of specified interface lines. The procedure uses the modified continuation power flow (MCPF) tracing a path of power flow solutions with respect to generation shift to vary interface flow. In simulation, voltage stability limits of the metropolitan interface flow of the KEPCO'98 system are determined.
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.
Seun Ryul Lee,Jae-young Yoon,Byeongmo Yang,Byongjun Lee IEEE 2012 IEEE transactions on applied superconductivity Vol.22 No.3
<P>The GENI project for applying the 22.9 kV HTS cable and the SFCL to real power system has been progressed in South Korea since 2008. The HTS power devices were applied to the Icheon substation in the real Korean power grid in August 2011. This is the first demonstration of HTS power devices in South Korea. For a successful application, this paper proposes proper specifications of a current limiting resistor/reactor and an activating current for the 22.9 kV SFCL in the Korean power distribution system. These specifications are determined, considering the protection system of real Korean power system.</P>