• Proceedings of the KIEE Conference
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• 2002.04a
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• pp.201-203
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• 2002

In recent years there has been a growing interest in renewable energy systems due to the environmental problem and the economic benefits of fuel savings. Such systems are usually connected to the existing power grid for "fuel displacement" purpose as well as of earning some "capacity credit". Wind power generation system(WPGS) is one of the most useful energy resource using natural environment. So far, it was very difficult to simulate the dispersed generation system including WPGS using EMTP or EMTDC because the source of the dispersed generation system has a particular wind power characteristic equation. In this paper, a novel simulation method of WPGS has proposed and a new wind turbine component for EMTDC is also developed. The wind power characteristic equation of wind turbine is used in order to realize the WPGS in EMTDC simulation. And the real field data of weather conditions is interfaced to EMTDC using Fortran program interface method. Consequently the simulation of WPGS using field data is realized in this paper and shows acceptable results.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.62 no.2
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• pp.72-78
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• 2013

In this study, samples from the site where there occurred unbalanced current when cable routing were analyzed, and the simulation program for electric power system analysis, PSCAD/EMTDC, was used to calculate the current unbalance on cable routing. Based on electromagnetic finite element analysis(FEA), electromagnetic parameters enabled the interlocking with COMSOL for the calculation of allowable current ampacity and magnetic filed distribution. This then led to modeling unbalanced current between common modes using the unbalanced current analysis program, thereby comparing and discussing the results from both. The analyzed model is a common mode 2 parallel circuit, which is a basic model for cable routing, and by arranging cables in various ways, the arrangement with the least current unbalance was suggested, which would, in the future, prevent earth faults and extend life for the whole cable.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.5
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• pp.457-467
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• 2005

This paper deals with the new frequency controller of the HVDC scheme linking Haenam to Cheju Island. The primary aim of the study is to develop and evaluate a new frequency controller after the removing of the present synchronous compensators. The simulation methods are the mix of PSCAD/EMTDC and PSS/E, the main system studies are done for the transient state analysis using PSCAD/EMTDC. The study cases are completed involving 3 phase, single phase trip and load tripping events and study plots presented. In conclusion, the new frequency measurement from the AC network gives effective frequency control and dynamic performance.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1328-1329
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• 2011

풍력발전 시스템의 원리를 이해하고, 대표적인 분산전원인 풍력발전 시스템을 전력계통에 연계시켜 그 특성을 모의, 분석할 수 있도록 전력계통 과도모의해석 프로그램인 PSCAD/EMTDC를 사용하여 현재 사용하고 있는 풍력발전 시스템 그리고 연계계통을 고려하여 구성하였고, 이 분산전원 모델이 유효한지 보이기 위하여 출력파형을 보였다. 그리고 이 분산전원 모델을 연계계통내 보호계전시스템등과 같은 분산전원과 관련된 전반적인 연구분야에 유용하게 이용할 수 있을 것으로 기대된다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.681-683
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• 2011

최근 태양광 및 풍력과 같은 신재생에너지원을 기반으로 한 국가정책에 따라 대규모의 분산전원이 도입 운용되고 있다. 그러나 대용량 분산전원의 계통연계에 대한 기술기준 및 체계적인 선로운영 기술기준이 미흡한 상태이며 정상상태 운용에서 태양광이 배전계통에 연계시 수용가 말단에 전력품질과 고조파 문제가 발생하여 분산전원의 배전계통 전압변동 특성 해석이 필요하다. 이에 본 논문에서는 태양광 전원이 배전계통에 연계 운전시 발생되는 문제를 분석하기 위해 배전계통의 대표적인 상용소프트웨어인 PSCAD/EMTDC를 이용하여 모델링을 수행하였다. 그리고 Simulation결과와 이론적인 수식과 비교, 분석을 통해 PV의 계통연계 전압특성을 제시하였다.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.66-69
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• 2010

본 논문에서는 태양광전원용 3상 인버터의 배전계통 연계시의 동특성을 이해하고 해석하기 위하여, dq좌표변환과 원하는 전압의 크기와 위상을 만들어 내기 위해 사용한 비례적분 제어기(Proportinal Controller : PI), 출력전류 제어를 위한 전류제어 알고리즘, 2상/3상 변환 및 인버터의 Sinusoidal PWM방식의 인버터 설계에 대한 이론적인 알고리즘을 제시하였다. 이를 바탕으로 PSCAD/EMTDC를 이용한 태양광발전의 모델링을 수행하여, Simulation 결과와 산술적 해석의 비교, 분석을 통하여 모델링의 유효성을 확인하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.446_447
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• 2009

This paper describes operational analysis results of the DC micro-grid using detailed model of distributed generation. Detailed model of wind power generation, photo-voltaic generation, fuel-cell generation was implemented with the user-defined model of PSCAD/EMTDC software that is coded with C-language. Various simulation results confirm that the DC micro-grid can operate without any problem in both the interconnected mode and the islanded mode. The operation analysis result confirms that the DC micro-grid make it feasible to provide power to the load stably.

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.507-511
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• 2012

최근 정부의 녹색정책의 일환으로 태양광 및 풍력발전 등의 분산전원이 도입 운용되고 있다. 현재 풍력발전은 배전계통에 전용선로에 주로 연계되어 실 계통에 미치는 영향은 미미하지만, 3[MW]이상의 대규모풍력발전이 일반 배전선로에 운용되면 배선선로의 전압품질문제를 야기할 수 있다. 따라서 본 논문에서는 PSCAD/EMTDC를 통해 풍력발전이 연계되어 운용되고 있는 제주도 김녕 D/L을 모델링하여 그 특성을 분석하고자 한다. 수계산과 다양한 모델링을 통한 Simulation 값을 비교 분석하여 풍력발전이 연계된 김녕 D/L의 말단 수용가의 전압변동을 해석하고 풍력발전이 배전선로에 미치는 영향을 평가하였다.

• 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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• 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.