• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.117_118
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• 2009

송전선 경과지 선정의 어려움과 같은 여러 가지 이유로 송전 설비를 확충하는데 어려움을 겪고 있다. 이에 따라 기존 송전 설비의 활용도를 높이는 방법으로 전력 계통의 신뢰도를 극대화할 필요가 있으며, 최근 이의 한 방편으로, 전력공급의 유연성 및 신뢰성을 확보할 수 있는 송전기술인 유연송전시스템(FACTS: Flexible AC Transmission System)이 사용되고 있다. 본 논문에서는 유연송전시스템을 포함한 전력계통의 모델을 설정하고, 이를 포함한 전력�墳育� 상태추정을 수행하였다. 개발된 프로그램은 6모선 시험계통을 이용하여 타당성을 검증하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.201-202
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• 2015

전력계통이 대형화, 복잡화됨에 따라 현재의 전력전송은 한계 전송량에 가깝게 운영되고 있다. 또한 정치적, 경제적, 사회적 수용성 등의 이유로 전력을 융통하기 위한 신규 초고압 송전선로의 건설도 어려운 실정이다. 이 때 루트 송전선로의 탈락은 계통의 과도안정도에 큰 영향을 끼칠 수 있으며, 발전기 탈락을 통하여 계통을 안정화 시킬 수 있다. 하지만 과도한 발전기 탈락은 계통의 신뢰성 있는 운영에 방해물이 될 수 있다. 유연송전기기(FACTS, Flexible AC Transmission Systems)는 이러한 루트 선로 탈락에 따른 발전기 탈락을 최소화 할 수 있다. 본 논문에서는 FACTS의 한 종류인 STATCOM(Static Synchronous Compensator)을 이용하여 사고 시, FACTS 기기 설치 유무에 따른 과도안정도 분석을 진행한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.149-155
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• 2004

This paper presents how to find proper operating points of FACTS devices to enhance the steady-state security level considering line contigency analysis. Three generic types of FACTS devices such as series controllers, shunt controllers, and series-shunt controllers are introduced and applied to moximize a security margin and to minimize security indices. Security indices related to line flows and bus voltages are utilized and minimized iteratively in this paper. Contingency analysis is performed to detect the most severe single line fault. In various load conditions, FACTS devices are tested to establish appropriate preventive or corrective action without generation re-dispatching or load shedding. The FACTS operation scheme is verified on the IEEE 57-bus system in a line-faulted contingency.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.3
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• pp.624-631
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• 2011

In this paper, the RCF method is used in sensitivity analysis problems of the discrete power systems including both series FACTS equipments such as TCSC in transmission lines and generator controllers such as Exciter and PSS in generator terminal. To apply the RCF method in small signal stability problems of discrete power systems, state transition equations of controllers and TCSC are derived and the sensitivity calculation algorithm using state transition equations in discrete time domain is devised. The results of eigenvalue analysis showed that the variations of eigenvalues after periodic switching operations of TCSC can be calculated exactly by the RCF method and the change of firing angles in TCSC have important effect to determine the stability of power systems.

• Journal of Electrical Engineering and Technology
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• v.9 no.4
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• pp.1258-1268
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• 2014

Improving grid connection of wind farms is a relevant issue to be addressed, especially for fixed-speed wind turbines. Certain elements, such as FACTS (Flexible AC Transmission Systems), are able to perform voltage and reactive power regulation in order to support voltage stability of wind farms, and compensate reactive power consumption from the grid. Several devices are grouped under the name of FACTS, which embrace different technologies and operating principles. Here, three of them are evaluated and compared, namely STATCOM (Static Synchronous Compensator), SVC (Static Var Compensator) and SSSC (Static Synchronous Series Compensator). They have been modeled in MATLAB/Simulink, and simulated under various scenarios, regarding both normal operation and grid fault conditions. Their response is studied together with the case when no FACTS are implemented. Results show that SSSC improves the voltage stability of the wind farm, whereas STATCOM and SVC provide additional reactive power.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2001.11a
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• pp.47-50
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• 2001

In order for effective operation of existing power systems, introduction of the so-called FACTS(Flexible AC Transmission System) such as SVC and UPFC etc, is unavoidable. The UPFC(Unified Power Flow Controller) is composed of STATCOM(Static Compensator) and SSSC(Static Synchronous Series Compensator), and is used to control the magnitude and phase angle of injected sources which are connected bothin series and in parallel with the transmission line to control the power flow and bus voltages. This paper presents a UPFC simulation on RTDS. The voltage and phase angle of a system have been analyzed by regulating the firing angle inside the UPFC.

• Proceedings of the KIEE Conference
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• summer
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• pp.224-226
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• 2004

Flexible AC Transmission System (FACTS) can greatly reinforce power systems through improvement of power transmission capacity and utilization of equipment under the circumstance of continuous load growth and deregulation SVC and STATCOM are shunt FACT devices that have similar static characteristics with Mwhuical Swikhed Capacitor (MSC). The main issue of this paper is the analysis of different dynamic characteristics when STATCOM is solely adopted and when STATCOM is adopted with combination of other reactive power compensator such as SVC and M5C. Furthermore, better application of reactive power compensators can be clarified through analysis of dynamic characteristics of various combinations of reactive power compensators.

• Proceedings of the KIEE Conference
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• 2000.11a
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• pp.217-219
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• 2000

Recently a static var compensator(SVC) is installed at Seo-deagu Substation. It is a power system controller using power electronics commonly called Flexible AC Transmission Systems(FACTS). This paper presents the characteristics and configuration of the Seo-deagu SVC. This paper discusses the modeling aspect of the Seo-deagu SVC systems. EMTDC simulation model of the Seo-deagu SVC is developed and verified.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.54 no.4
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• pp.159-164
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• 2005

Various compensators are installed into the power system to operate the system economically and stably by maximizing the availability of utilities and power transmission capability. Fixed Capacitor(FC), Mechanical Switched Capacitor(MSC), and FACTS(Flexible AC Transmission Systems) are used to regulate voltage and power flow of the system. When a disturbance occurs in the power system, the Fixed Capacitor operates dependently on the voltage of the power system and cannot change the amount of installation automatically. But compared to other equipment, the Fixed Capacitor is more economical due to its low cost. Since MSC can change the amount of installation according to the state of the power system, operates more effectively than the Fixed Capacitor. FACTS have fast dynamic performance for the transient condition, but the cost is high. Therefore, it is needed to develop an optimized installation planning for the reactive power compensators by considering their dynamic performance and cost. In this paper, an optimized compensator combination and the proposed scheme is proposed and it is applied to KEPCO system in order to show its capabilities.

• Journal of Electrical Engineering and Technology
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• v.8 no.3
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• pp.478-489
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• 2013

The controllability and stability of power systems can be increased by Flexible AC Transmission Devices (FACTs). One of the FACTs devices is Interline Power-Flow Controller (IPFC) by which the voltage stability, dynamic stability and transient stability of power systems can be improved. In the present paper, the convenient operation and control of IPFC for transient stability improvement are considered. Considering that the system's Lyapunov energy function is a relevant tool to study the stability affair. IPFC energy function optimization has been used in order to access the maximum of transient stability margin. In order to control IPFC, a Brain Emotional Learning Based Intelligent Controller (BELBIC) and PI controller have been used. The utilization of the new controller is based on the emotion-processing mechanism in the brain and is essentially an action selection, which is based on sensory inputs and emotional cues. This intelligent control is based on the limbic system of the mammalian brain. Simulation confirms the ability of BELBIC controller compared with conventional PI controller. The designing results have been studied by the simulation of a single-machine system with infinite bus (SMIB) and another standard 9-buses system (Anderson and Fouad, 1977).