• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1164-1166
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• 1999

This paper presents Static Synchronous Series Compensator(SSSC) model for power flow study using IPLAN. In the proposed model, SSSC is represented by the equivalent load variation. The equivalent load consists of active power load specified by user and reactive power load which is founded for considering characteristic of SSSC. And this is implemented by IPLAN which is a macro-external program for PSS/E. Using this model, SSSC can be solved in load-flow by just calling the model in PSS/E. The proposed model was applied to a realistic power system for validity test.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.154-156
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• 2002

PSS/E의 내부 시퀀스인 IPLAN을 이용하여 반복 조류계산을 함으로서 P-V, Q-V 곡선의 P, Q, V 값을 계산하는 IPLAN을 작성하였다. 작성된 곡선들은 유효전력 및 무효전력 예비력을 판단하는 지표, 전압안정도를 판별하는 지표 등 여러 방면에서 사용될 수 있다.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.3
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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.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.223-226
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• 2004

This paper describers the power demand and the voltage stability in power system. Especially the power demand on summer is more and more increase in korea. According to load quantity is increasing voltage is getting down. And power system becomes unstable. So this paper is prevent voltage down using to ULTC modeling which is a part in a transformer. Therefore our purpose is power system stability increasing as variable state like a load increasing or a fault. Then this paper is using IPLAN and PSS/E as analysis tool. PSS/E is very powerful engine on load flow analysis. And IPLAN is capable of using on variable program compiling with user.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.268-270
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• 2005

전력계통을 계획, 운영, 검토, 해석하는데 있어서 가장 필요한 OPF(Optimal Power Flow)는 현재 다방면에서 새로운 알고리즘과 많은 수리적 방법을 통하여 접근하고 있다. 이들의 기반이 되는 조류계산은 많은 신뢰성들을 얻었지만, 현재 실무자 중심으로 구성되고 직접적으로 적절한 발전배분 상태를 계산하는 부분에서는 일부 한계성이 나타나고 있다. 이에 대해서 계속된 반복계산에 의한 최적의 계통 발전 배분상태에 근접한 값을 제시할 수 있는 프로그램을 PSS/E의 IPLAN을 통하여 개발하였다.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.220-222
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• 2005

When a large-scale load or a new generator is connected to power systems, KPX assesses the effect of the connection on power systems to keep security and reliability standards. As the number of connection requests has been increased, KPX is spending much time for technical assessments of the requests. This paper developed an automatic assessment program to reduce analysis time and enhance simulation accuracy. The program is based on IPLAN and. can be applied to both load and generator network connection requests.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.25-27
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• 2003

전력계통 해석용 프로그램으로 우리나라에서 주로 사용되고 있는 것은 PSS/E(Power System Simulation and Engineering) 이다. 이것은 계통해석을 위한 범용 프로그램으로 그 기능이 다양하지만, 상정고장 검토와 같이 많은 설비고장에 대하여 반복적인 과정의 모의를 하는 경우 적절한 자동화 방안이 없는 단점이 있다. 본 연구에서는 IPLAN을 활용하여 이러한 반복과정을 자동으로 수행하고 계산결과 안전도 위배사항을 요약하여 Report하므로써 전력계통 안전도평가 업무를 신속하고 정확하게 수행할 수 있는 프로그램을 개발하였다. 또한 본 프로그램은 방대한 계통DB에 대한 필요한 정보를 요약제공하므로 전체적인 DB구성에 대한 파악이 용이할뿐만 아니라 계통DB의 수정입력을 위한 툴을 함께 개발하여 제공하므로써 사용자 편의를 도모하였다.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.316-318
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• 1998

This paper presents an approach that provides an equivalent initial operating condition of UPFC in load-flow study for stability analysis. The UPFC model for load-flow implemented by IPLAN in PSS/E is represented by an equivalent load injection. In doing so, the transmission line to which UPFC is connected is disconnected and the function of UPFC is represented by the equivalent load variation. This operating condition may not be adequate as an initial condition for subsequent dynamic simulation. The proposed approach provides a way of equivalencing UPFC load injection without line disconnection. The method was applied to a realistic power system for validity.

• Proceedings of the KIEE Conference
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• summer
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• pp.171-173
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• 2004

This paper presents the selection of optimal placement for STATCOM (Static synchronous Compensator) which is one of the FACTS (Flexible Alternating Current Transmission System) devices, considering line contingency. Line contingency ranking is gotten by using sensitivity of load margin. According to line contingency ranking line contingency was considered. And IOP (Index for selecting optimal Placement of STATCOM) is calculated by the variation of each bus's reactive mum for several line contingencies. The bus where has the biggest value of lOP is the most optimal placement to install STATCOM for voltage stability. IPLAN is used to program this part which get IOP. This study is carried out on the modified IEEE14 Bus Test System to confirm the efficiency of the method.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.6
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• pp.15-19
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• 2001

This paper presents an modelling and analysis of SSSC and UPFC in static analysis of power systems. SSSC is used to control active power flow in transmission lines by controlling the phase angle of the injected voltage source which is in rectangular to the line current. UPEC is used to control the magnitude and phase of the injected voltage sources which are connected both in series and in parallel with the transmission line to control power flow and bus voltage. To compare the effect of SSSC and UPFC in power system static analysis, the PSS/E simulation program is used. As the FACTS device model such as SSSC and UPFC is not provided in PSS/E yet, an equivalent load model is used. This procedure is implemented by IPLAN which is an external macro program of PSS/E. The simulation results show that UPFC is more effective to improve bus voltage than SSSC in power system static analysis.