• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 A
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• pp.196-198
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• 2000

The UPFC is a new transmission power flow controller that has the ability to provide dynamic bus voltage control, series real power flow control and series reactive power control. With all of these versatile capabilities, it can provide transmission planner with a new tool to resolve system concerns for a wide variety of system conditions. This paper will describe UPFC system characteristics, operation status under special network systems and outline some advantageous applications. The first UPFC in Korea will be installed and operated by KEPRI and Hyosung Co.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1023-1025
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• 1999

This paper provides the steady-state UPFC model referred as UPFC injection model for power flow control. The application of UPFC for the line overload alleviation is demonstrated through a numerical example. It is shown that UPFC has the capability of regulating the power flow, therefore alleviating the line overload.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1155-1157
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• 1999

The UPFC is known to have the ability to control both the real power flow and the reactive power flow. [1],[2] The power flow in the system is heavily related with the system security. [4] This paper deals with the operation of the UPFC to increase the power system security. The concept of the power system security is verified and the index to indicate the power system security level is suggested. And the algorithm to find the optimum operation point of the UPFC improving the system security level is presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.151-153
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• 2002

Using UPFC(Unified Power Flow Controlled), it is possible to control three parameters(voltage, impedance, and phase angle). The UPFC can generate or absorb reactive power rapidly so as to enhance the transient and voltage stability and also influence the power flow. In this paper, the effects of application of the UPFC to the power system are analyzed from a viewpoint of improving the total transfer capability by enhancing voltage stability. The IPLAN, which is a high level language used with PSS/E program, is employed for evaluating the total transfer capability from a f-V curve.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.32-34
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• 2002

본 논문에서는 직렬주업변압기가 없는 새로운 UPFC의 시뮬레이션모형을 개발하고 그 특성을 분석한 내용에 대해 기술하고 있다 송전계통에 적용 가능한 UPFC의 새로운 토폴로지를 제안하고 상세모델을 통하여 계통의 전력조류제어 및 과도상태시의 동특성을 시뮬레이션 한다. 전력시스템의 과도상태 및 제어에 대한 시간영역 시뮬레이션 프로그램인 EMTDC (Electro-Magnetic Transients in DC system)를 사용하여 계통의 전력조류제어인 유효전력과 무효전력의 제어를 수행하고 병렬측의 모선단 입력전압의 크기를 제어한다. 시뮬레이션 결과를 통하여 UPFC 상세모델의 제어성능을 검증한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.220-222
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• 2001

This paper represents impedance calculation of the distance relay using PSCAD/EMTDC software for transmission line involving the UPFC (Unified Power Flow Controller) device, which is the most vigorous component of FACTS. The presence of the UPFC significantly affects the line parameters of transmission system, which are also influenced by the distance relay setting. Moreover depending on the UPFC location and its parameters, zones of setting the distance relay will be changed. The presence of the UPFC in the fault loop affects both voltage and current seen by relay. Therefore, the distance relay should be taken into account the variable injected voltage of the UPFC.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.491-493
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• 2003

전력계통의 유연하고 안정적인 운용을 위한 인버터형 FACTS 기기의 국내 적용에 대한 연구 결과를 토대로 국내 154kV 계통에 적용되는 80MVA급 UPFC pilot plant project가 수행되었다. Project의 결과물로써 80MVA급 UPFC가 강진-장흥 154kV 계통에 제작, 설치되었다. 강진 변전소 UPFC는 각종 성능 시험 및 시운전 절차를 성공적으로 완료하였으며 현재는 병렬 인버터에 의한 강진 모선의 전압 제어 및 직렬인버터에 의한 강진-장흥간의 조류 제어 기능을 수행하며 상용 운전되고 있다.

• 대한전기학회논문지:전력기술부문A
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• 제48권3호
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• pp.220-225
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• 1999

This paper presents an UPFC (Unified Power Flow Controller) model for stability study using PSS/E. The proposed UPEC model was implemented by IPLAN which is a high level language. As a control strategy for damping electromechanical oscillations, energy function method was adopted. By the adopted control law, the damping effect is robust with respect to loading condition, fault location and network structure. Furthermore, the control imputs are based on local signals. The effect of control of the UPFC model was demonstrated on an one machine infinite bus system and a two area system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.269-272
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• 1998

This paper presents an UPFC(Unified Power Flow Controlled model that considered rating for stability study. The proposed UPFC model was implemented by PSS/E and IPLAN. As a control strategy for damping electromechnical oscillations, energy function method was adopted. By the adopted control law, the damping effect is robust with respect to loading condition, fault location and network structure. The effect of control of the UPFC model was demonstrated on a one machine infinite bus system.

• KIEE International Transactions on Power Engineering
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• 제11A권4호
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• pp.21-26
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• 2001

As competition is introduced in the electricity supply industry, congestion becomes a more important issue. Congestion in a transmission network occurs due to an operating condition that causes limit violations on the transmission capacities. Congestion leads to inefficient use of the system, or causes additional costs (Congestion cost). One way to reduce this inefficiency or congestion cost is to control the transmission flow through the installation of UPFC (Unified Power Flow Controller). This paper also deals with an optimal siting of the UPFC for reducing congestion cost by using shadow prices. A performance index for an optimal siting is defined as a combination of line flow sensitivities and shadow prices. The proposed algorithm is applied to the sample system with a condition, which is concerning the quadratic cost functions. Test results show that the siting of the UPFC is optimal to minimize the congestion cost by the proposed algorithm.