• KIEE International Transactions on Power Engineering
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• v.5A no.3
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• pp.244-251
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• 2005

Power transfer capability has been recently highlighted as a key issue in many utilities. It is determined by the thermal stability, dynamic stability and voltage stability limits of generation and transmission systems. In particular, voltage stability affects power transfer capability to a great extent in many power systems. This paper presents a tool for determining total transfer capability from a static voltage stability viewpoint using IPLAN, which is a high level language used with the PSS/E program. The tool was developed so as to analyze static voltage stability and to determine the total transfer capability between different areas from a static voltage stability viewpoint by tracing stationary behaviors of power systems. A unified power flow controller (UPFC) is applied for enhancing total transfer capability between different areas from the viewpoint of static voltage stability. Evaluation of the total transfer capability of a practical KEPCO power system is performed from the point of view of static voltage stability, and the effect of enhancing the total transfer capability by UPFC is analyzed.

• Proceedings of the KIEE Conference
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• 2002.11b
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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.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.2
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• pp.148-154
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• 2008

The power transfer capability has been recently highlighted as a key issue in many utilities. The total transfer capability in the KEPCO power system is determined mainly by the voltage stability limit and an enormous number of contingencies should be analyzed to determine the total transfer capability. In this paper, a new ranking index for determining the total transfer capability from voltage stability point of view is presented. This index is applied to the practical system of KEPCO and the effects of ranking the contingencies are analyzed by use of PSS/E package and a developed IPLAN program.

• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.262-264
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• 2000

This paper presents an effect of UPFC to the power system analysis. UPFC is equivalently represented as a synchronous condenser and load, while the active and reactive power of the specific transmission line and the voltage of the bus is scheduled appropriately. This procedure is implemented by IPLAN which is an application program in PSS/E. The simulation results show that UPFC is very effective to control the transmission line over-load and bus voltage variation.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.90-92
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• 2002

The SVC(Static Var Compensator) resulted from the FACTS technology can generate or absorb reactive power rapidly so as to increase the transient and voltage stability. In this paper, the SVC is applied to the power system in order to improve the total transfer capability from a viewpoint of static voltage stability and the effects of application of the SVC to the power system are analyzed. The IPLAN, which is a high level language used with PSS/E program, is employed for determining the total transfer capability.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1296-1298
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• 1999

This paper describes a power flow method for the unified power flow controller(UPFC) considering equipment sizes and constraints. The operation of UPFC subject to the practical constraints encounted in an actual high power installation. So the Power flow method for FACTS must be considered its constraints for power system analysis. The proposed UPFC power flow method was implemented by PSS/E and IPLAN.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.207-208
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• 2015

최근 HVDC의 설치가 증가하면서 HVDC 컨버터에 의한 고조파가 계통에 영향을 끼치고 있다. 고조파는 전압 왜곡, 손실 증가, 과열 등의 문제를 야기하므로 고조파 필터를 통해 제거되어야 한다. 효율적인 고조파 필터 설계를 위해서는 계통의 고조파 임피던스에 대한 분석이 필요하다. 본 논문에서는 PSS/E에 내장된 IPLAN 프로그램을 사용하여 계통의 고조파 임피던스 특성을 분석하였다. 계통 요소의 모델링은 집중 부하모델 4와 과도 리액턴스 발전기 모델을 사용하였다. 중첩 원리를 이용하여 PSS/E에 내장된 IEEE 25모선에서 1차 고조파에서 70차 고조파까지의 고조파 차수 변화에 대한 계통 임피던스를 계산하였다.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.73-76
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• 2001

This paper presents a new systematic contingency selection, screening and ranking method for on-line transient security assessment. Transient stability of a particular generator is influenced most by fault near it. Fault at the transmission lines adjacent to the generators are selected as contingency. Two screening methods are developed using the sensitivity of modal synchronizing torque coefficient and computing an approximate critical clearing time(CCT) without time simulation. The first method, which considers only synchronizing power, may mislead in some cases since it does not consider the acceleration power. The approximate CCT method, which consider both the acceleration and deceleration power, worked well. Finally the Single Machine Equivalent(SIME) method is implemented using IPLAN of PSS/E for detailed stability analysis.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.146-148
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• 2001

The STATCOM(Static Compensator) resulted from the FACTS technology can generate or absorb reactive power rapidly so as to increase the transient stability and voltage stability. In this paper, effects of application of the STATCOM to the power system are analyzed from a viewpoint of improving voltage stability. The voltage stability is analyzed by use of repeated power flow method. The IPLAN, which is a high level language used with PSS/E program, is employed for evaluating the voltage stability.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.239-241
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• 2003

The time domain simulation method of transient stability presents accuracy and reliability, but it demands much computational time. Therefore it is necessary to filter out very stable and very unstable cases from a large set of contingencies. Following a disturbance, the shape and magnitude of representative generator angle which is most increased after fault clearing are the measure of transient stability. This paper propose a method that is not a calculation of the exact CCT of contingency, but a fast assessment of transient stability. Also it can help operators identify transient stability immediately without analyzing the graphical results. The proposed method is applied to the KEPCO system. The PSS/E is used as a time domain simulation engine by IPLAN.