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인버터 기반 독립형 마이크로그리드의 고장전류 보호시스템

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Alternative Title
Protection System of Fault Current on Inverter based Stand-alone Microgrid
Abstract
Faced with environmental issues, many countries around the world have changed their obligations to reduce greenhouse gases, which were only applied to advanced countries, to a universal system in which all countries participate in reflecting their circumstances through the Paris Agreement in 2015. As a result, renewable energy resources are being installed in microgrids such as islands.
One of the ways to increase the penetration rate of renewable energy resources in a stand-alone microgrid is that the ESS generates a reference voltage through CVCF controller. However, this method can't supply the fault current in the event of a phase to earth or phase to phase short circuit fault. Therefore, the protective relays are impossible to operate.
In this paper, a protection system is proposed that only the fault feeder can be eliminated in the event of an asymmetrical fault when ESS generates a reference voltage. The proposed protection system can only eliminate fault feeder through low voltage and negative sequence current when over current is generated by a fault. The PCS outputs a low voltage when an over-current is measured and determines if the fault has been resolved through the negative sequence current. The feeder's protective relay is opened when a low voltage and the negative sequence current are detected. This method requires no communication between the PCS and the protective relay, and protection cooperation can be established by the user.
To verify the proposed protection system, a stand-alone microgrid was modeled through the PSCAD/EMTDC program. The simulation was performed by dividing cases by phase to earth and phase to phase short circuit fault.
Author(s)
김기훈
Issued Date
2021
Awarded Date
2021. 2
Type
Dissertation
URI
https://oak.jejunu.ac.kr/handle/2020.oak/23559
Alternative Author(s)
Kim, Gi Hoon
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 전기공학전공
Advisor
김일환
Table Of Contents
그림 목차 ⅲ
표 목차 ⅵ
SUMMARY ⅶ
기호 설명 ⅷ
1. 서 론 1
2. 계통 보호시스템 3
2.1 고장전류 해석 3
2.2 보호계전기 정정 7
2.3 회전기기반 고장전류 보호시스템 9
3. 제안된 고장전류 보호시스템 10
3.1 사고 시 역상전류 10
3.2 전력변환시스템 제어 13
3.3 보호계전기 동작 17
4. 컴퓨터 해석 및 결과 고찰 19
4.1 컴퓨터 모델링 19
4.1.1 디젤발전기 모델링 20
4.1.2 전력변환시스템 제어 모델링 21
4.1.3 부하피더 모델링 22
4.1.4 차단기 보호협조 모델링 23
4.2 컴퓨터 해석 결과 23
4.2.1 지락사고 24
4.2.2 단락사고 35
4.3 결과 고찰 46
5. 결론 48
참 고 문 헌 49
Degree
Master
Publisher
제주대학교 대학원
Citation
김기훈. (2021). 인버터 기반 독립형 마이크로그리드의 고장전류 보호시스템
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Faculty of Applied Energy System > Electrical Engineering
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