• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.113-115
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• 2000

This paper presents the modeling and simulation studies, using PSCAD/EMTDC, for the operation of DR(Distributed Resources) connected to the power system. In this study, we model the DR operated in parallel with the distribution system and simulate several operation modes of DR. Finally, the transient characteristics of the operation modes are evaluated with IEEE Standard 519-1992. IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.117-119
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• 2005

Voltage Flicker는 다른 전력품질 요소들과는 달리, 전압의 흔들림이 사람의 눈과 뇌에 미치는 영향을 고려한 지수이다. IEC 61000-4-15에서는 이러한 플리커의 평가 알고리즘을 제시하고 있으며, 제한치를 $Pst{\leq}1$, $Plt{\leq}0.65$로 정의하고 있다. 이 제한치는 다양한 비선형 부하들의 경우에도 만족시켜야 하며, 계통의 설계 시 미리 고려를 할 필요성이 있다. 본 논문에서는 Fortran을 이용하여 IEC61000-4-15의 플리커미터 알고리즘을 구현하고 이를 PSCAD/EMTDC의 Module로 적용시켜, 시험 계통이 플리커 제한치를 만족시키는가에 대한 테스트가 가능하도록 하였다.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.232-234
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• 2002

A Vacuum Circuit Breaker Model for simulation of transient overvoltages was developed by using the PSCAD/EMTDC. The Model includes the power frequency chopping current. Breaker withstand voltage, and quenching capability of High frequency currents. To verify the abilities of the breaker model, the simulation on the Lindmayer's single-phase circuit was carried out. The results show that using the proposed model, the transient overvoltages, current chopping, and multiple reignitions of vacuum breaker are properly reproduced as real phenomena. In further study, virtual chopping current will be incorporated into the model for 3 phase system.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.353-354
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• 2015

TCSC 적용시 송전선로의 송전용량 증대와 효율적인 송전계통 운영 가능하기 때문에 국외에서는 TCSC에 대한 많은 적용 사례와 연구가 진행되어 왔다. 이러한 이유로 국내에서도 송전계통의 안정성과 효율성 증대를 위한 TCSC 도입이 고려되고 있다. 본 논문에서는 리액턴스 제어, 전류 제어 또는 전력 제어, 전력동요 억제를 위한 제어 등 TCSC의 다양한 제어기를 포함하는 상세 모델을 PSCAD/EMTDC를 이용하여 모델링한다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.46-48
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• 2008

The increase of fault current due to large demand has caused the capacity of power machines in power grid to increase. To protect the power system effectively from the large fault current, several superconducting fault current limiters have been proposed. however, in order to apply superconducting fault current limiters into power system, there are many problems such as cost, recovery, AC loss, and cryogenic. In order to solve these problems, hybrid superconducting fault current limiter(HSFCL) was proposed. In this paper, we modeled hybrid superconducting fault current limiter using PSCAD/EMTDC and analyed fault current limiting characteristic and total resistance of hybrid superconducting fault current limiter.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.2
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• pp.116-121
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• 2006

This paper presents an effective modeling and simulation scheme of solar-powered hydrogen production system (PV-SPE: Photovoltaic Solid Polymer Electrolyte). Existing Hydrogen production technologies can produce vast amounts of hydrogen from hydrocarbons but emit large amounts of carbon dioxide (CO2) into the atmosphere. Advanced hydrogen production methods need development. Renewable technologies such as solar and wind need further development for hydrogen production to be more cost-competitive from other resources. In this paper, authors have focused on a renewable technology to move one step further toward commercial readiness of solar-powered hydrogen production system. Software (PSCAD/EMTDC) based model of PV-SPE system is studied for an effective simulation of hydrogen production system. Using the simulation results, an actual PV-SPE system is implemented to verify the simulation results by comparing them with actual values obtained from the data acquisition system.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.290-292
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• 2002

전기철도 급전계통은 차량 또한 이동 부하이고, 비정상적인 전기적 특성이 나타날 수 있으므로, 전기적으로 정확한 해석을 할 필요가 있다. 본 연구는 PSCAD/EMTDC 과도해석 프로그램을 이용하여 직류 전기 철도 시스템을 모델링 함으로써 전기철도 급전계통의 정확한 특성을 연구하는 것이다. 한전 계통으로부터 전력을 급전 받아 전기철도차량 부하에 공급되는 급전계통을 실제와 가깝게 모델링 함으로써 정상상태 해석과 사고 시 과도특성 분석 및 계통에의 영향 해석을 목적으로 한다. 프로그램 특성상 각각의 소자를 모델링 한 후 4단자망 이론에 근거, 각 소자를 결합하여 전체 계통을 구성한다. 각각의 소자는 전차선로, 정류기 및 제어기를 포함한 차량부 (전동기, 제어소자), 정류 변전소 등으로 구성된다. 이 논문에서는 급전계통의 정상상태 및 고장전류를 분석함으로서 제안된 모델을 검증한다.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.309-312
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• 2002

For the purpose of more effective simulation of the utility interactive WPGS(Wind Power Generation System) the SWRW (Simulation method for WPGS using Real Weather condition) is used in this paper, in which those of three topics for the WPGS simulation. user-friendly method, applicability to grid-connection and the utilization of the real weather conditions, are satisfied. The simulation of the WPGS using the real weather condition including components modeling of wind turbine system is achieved by introducing the interface method of a non-linear external parameter and FORTRAN using PSCAD/EMTDC. The simulations of steady-state and transient-state are performed effectively by the introduced simulation method. The generator output and current supplied into utility can be obtained by the steady-state simulation, and THD can be achieved by analyzing the results as well. The transient - state of the WPGS can be analyzed by the simulation results of over cut-out wind speed.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.320-322
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• 2002

The paper presents an electrical model of a grid-connected wind energy conversion system (WECS) with a variable speed drive, a fixed pitch angle, a synchronous generator as a wind generator and AC-DC-AC conversion scheme for simulating dynamic behaviors and performance responding to varying wind speed input. The electric output of the WECS is controlled by the AC-DC-AC conversion scheme, the objective of which is to capture the maximum active power under varying wind conditions and to keep the voltage of WECS terminal bus at a specific level. Aerodynamic models are used to incorporate the power characteristics to wind speed. The modeling and simulation of the WECS are realized on PSCAD/EMTDC environment.

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.89-92
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• 2011

본 연구에서는 전력계통(특히 배전계통)의 해석분야에서 가장 일반적으로 사용되고 있는 상용 S/W인 PSCAD/EMTDC를 이용하여, 분산전원이 배전계통에 연계되어 운용되는 상태(정상, 사고, 품질상태)를 모의할 수 있는 계통연계 시험장치를 모델링하는 방법을 제시하였다. 이 모델링에 의한 다양한 시뮬레이션 결과를 바탕으로 분산전원 계통연계 시험장치의 기능을 확인하여, 분산전원이 연계된 배전 계통의 모의 시험장치를 제작하는데 기초적인 데이터로 활용할 수 있도록 하였다.