• Proceedings of the KIEE Conference
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• 2001.07a
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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.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.289-291
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• 2001

This paper represents the application of the Static Var Compensator (SVC) on the electric railway power supply system to compensate for the voltage drop. The high reactance of line and a heavy train load consume a significant amount of the reactive power which results the voltage drop. This paper shows that the SVC is necessary for voltage compensation in the railway power supply system and verify effectiveness of the SVC through the simulation by using PSCAD/EMTDC. In this paper, the case studies were performed with the various line length and train loads.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1089-1090
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• 2006

This paper analyzes impedance convergence characteristics and harmonics of electric locomotives operation and fault condition. To simulate the various fault and operation condition, AT feeding system and various locomotives are modeled using PSCAD/EMTDC. Analysis shows that impedance are converged into protection area in the case of short fault between catenary and rail or catenary and feeder line but in the case of disconnection fault, impedance is rater bigger so protective relay can't detect the fault. Therefore more analysis of overload and high impedance fault caused disconnection fault is needed.

• Proceedings of the KIEE Conference
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• 1997.07c
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• pp.867-870
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• 1997

This paper presents application of battery energy storage system(BESS) for interconnection with power distribution system. We configured interconnection model using PSCAD/EMTDC program. The simulation for voltage regulation on BESS interconnection with power distribution analyzes transient voltage variation, steady state voltage variation, and voltage of reverse power flow at interconnected feeder and nearby feeder.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.8
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• pp.1113-1118
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• 2018

Protection in HVDC(High Voltage Direct Current) have the very fast velocity of fault detection. Because Fault in HVDC has the fast propagation, large currents, high interruption cost. The focus to velocity caused possibility of errors like a detection error like a high impedance fault. In this paper, Proposed complex composition for get the reliability and velocity. That used SFCL(Super Conducting Fault Current Limiter), Protection Zone and DTS(Distributed Temperature Sensing). The SFCL was detect the fault by quench and DTS&Protection Zone were perceive the detect by variation too. To examine the proposed method, PSCAD/EMTDC simulated. The results of simulation, proposed methods could the detect of fault to whole HVDC line. And that improved the reliability of fault clearing.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.298-300
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• 2008

고립된 소규모 전력시스템에 소형 풍력발전기를 계통연계 운전할 때 나타날 수 있는 전압변동을 예측하기 위한 방법에 관해 연구하였다. 이를 위하여 고립된 계통에 연결된 기존발전소 및 부하, 변압기, 풍력발전기의 간략화된 시뮬레이션 모델을 PSCAD/EMTDC를 기반으로 구성하고 실제 설치된 풍력발전기의 운전 특성과 비교하였다. 특히, 연계점의 전압변동을 해석적으로 예측하기 위하여 전원측 등가 임피던스와 부하측 등가 임피던스로 구성된 간략화한 모델을 제안하였으며 제안된 방법으로 계산된 전압변동량이 시뮬레이션 및 실측 데이터와 잘 일치하는 것을 확인하였다. 이 결과는 소형 풍력발전기 계통연계 시스템 설계 및 사전검토 단계에서 안정성과 신뢰성을 확보 하기위한 도구로 활용될 수 있다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.2
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• pp.248-254
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• 2010

This paper deals with implementation of the laboratory-scale microgrid using energy storage system. Also, this paper develops a simulation model of the microgrid with same parameters on the laboratory-scale microgrid using PSCAD/EMTDC. The experimental results show good agreement with the simulation results. This shows the validity of the simulation model. A valve regulated lead acid (VRLA) battery is used to store energy. Energy storage system with fast response is able to maintain power quality of sensitive load within the microgrid.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.7
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• pp.1221-1225
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• 2010

The application of the AC and DC lines on the same transmission tower is an economical and practical approaching that increase the power transmission capacity of an existing transmission corridor. But, In this case, Inductive and capacitive coupling between AC and DC lines on the same tower should be investigated in advance. According to the installation plan of 80kV ${\pm}$60MW bipole HVDC in Cheju, KOREA that will be commissioned until 2011, DC lines will parallely operate with 154kV 2 AC lines in existed 154kV AC 4 lines transmission tower. This paper presents the steady state analysis results about the interaction between 154kV AC and 80kV DC lines in the same transmission tower.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.1
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• pp.1-7
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• 2011

Active power control scheme for distributed generation in microgrid consists of feeder flow control and unit power control. Feeder flow control is more useful than the unit power control for demand-side management, because microgrid can be treated as a dispatchable load at the point of common coupling(PCC). This paper presents detailed descriptions of the feeder flow control scheme for the hybrid system in microgrid. It is divided into three parts, namely, the setting of feeder flow reference range for stable hybrid system operation, feeder flow control algorithm depending on load change in microgrid and hysteresis control. Simulation results using the PSCAD/EMTDC are presented to validate the inverter control method for a feeder flow control mode. As a result, the feeder flow control algorithm for the hybrid system in microgrid is efficient for supplying continuously active power to customers without interruption.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.1
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• pp.14-19
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• 2011

The implemetation of the AC and DC lines on the same transmission tower is an economical and practical approaching that increase the power transmission capacity of an existing transmission corridor. But, In this case, Inductive and capacitive coupling between AC and DC lines on the same tower should be investigated in advance. According to the installation plan of ${\pm}80kV$ 60MW bipole HVDC in Jeju island, KOREA that will be commissioned until 2011, DC lines will parallely operate with 154kV 2 AC lines in existed 154kV AC 4 lines transmission tower. This paper presents the transient analysis results about the interaction between 154kV AC and 80kV DC lines in the same transmission tower.