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논문 기본 정보

자료유형
학위논문
저자정보

최선영 (창원대학교, 昌原大學校)

지도교수
朴勝燁
발행연도
2015
저작권
창원대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (2)

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Modern electric power systems are so huge and complicated that it is often impossible to study their electromagnetic transient analysis without any proper model which represents the practical power systems. In order to handle this kind of problem, various tool packages are provided and many studies have been performed by researchers in the field of transient phenomenon analyzing in electrical power system. As the interest in smart grid and smart power management system are getting popular, this kind of studies on proper modeling transient in power system are needed for the design of stable power system and secure management of it.
To understand a practical power system properly, especially in transient state, these models should have a characteristics of describing drastic changes in the system. Electrical transient state is lasted for extremely short time and has a wide range of frequency bandwidth, the good model to represent it should be a FDNE (Frequency Dependent Networks Equivalent). In this paper, an equivalent model as an admittance transfer function is provided, which is a rational function and its order could be decided by a new proposed method of GA(Genetic Algorithm). Generally coefficients of the rational functions are fitted by data from electrical machinery such as a generator, transformers, transfer lines or real tiny scale of power system, whereas in this study, a practical power system model, courtesy of ERIK, New Zealand south island, is used for more accurate modeling and simulation to prove the usefulness of the proposed FDNE.
Four different step frequencies reaching up to 5000Hz of FDNE models are designed for comparison to find the better performance model in representing the practical system. For more specific study on low frequency features, 1Hz scanning step FDNE model is designed. Every FDNE system designed is linked to AC-DC power networks, containing HVDC CIGRE model, with fault applied and removed test condition, different simulations are performed to demonstrate this methodology and its high caliber.

Key Words: FDNE (Frequency Dependent Network Equivalent), evolution process, GA (Genetic Algorithms), ARMA, optimal order, phenotype, electromagnetic transient.

목차

제 1 장 서 론 ··················································································· 1
1-1. 연구배경 ························································································ 1
1-2. 연구동향 ························································································ 2
1-3. 연구목표 ························································································ 6
1-4. 논문구성 ························································································ 7
제 2 장 전력시스템 전자기 과도현상······················································ 8
2-1. 전자기 과도현상 ············································································· 8
2-2. 등가모델을 이용하는 과도현상의 해석 ·············································· 10
제 3 장 과도현상 해석을 위한 주파수의존 전력시스템 등가회로 ··············· 13
3-1. 전자기 과도현상 해석을 위한 시스템 등가화······································ 13
3-2. FDNE 모델링에 있어 유리함수 적합에 대한 다양한 접근법 ················ 21
3-3. 시간영역에서의 해석을 위한 전압/전류 동반 모델 ····························· 31
제 4 장 Z영역 주파수의존 등가 시스템 개발 ·········································· 36
4-1. Z영역에서 시스템 함수 정의 ··························································· 36
4-2. Z영역 모델 완성 ············································································ 39
4-3. 유전 알고리즘과 FDNE 모델의 평가 ················································ 44
제 5 장 교류-직류 시스템에 대한 FDNE모델을 이용한 전자기 과도현상
시뮬레이션 및 고찰 ································································· 51
5-1. 주파수영역의 모델 확인 ································································· 51
5-2. 유전알고리즘을 적용한 FDNE 모델의 최적차수 선정 ························· 59
5-3. 완성된 FDNE 시뮬레이션 및 고찰 ··················································· 66
제 6 장 결 론 ················································································ 89
참고문헌 ······························································································ 92
Abstract ····························································································· 96

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