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독립형 마이크로그리드의 과도 안정도를 고려한 다중 ESS 설계에 관한 연구

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Alternative Title
A Study on the Multi-ESS Design for Improving the Transient Stability in an Isolated Microgrid
Abstract
This dissertation proposes a design method considering the transient stability of a stand-alone microgrid based on multi-ESS(Energy stroage system), The proposed method contributes to securing transient stability of the power system by maintaining the output margin of the CVCF ESS. In this system, the auxiliary ESS prepares for disturbances such as cut-off accidents. In addition, the three-phase reactive current components and the unbalanced current components are shared with the CVCF ESS to prevent PCS(Power conversion system) overload situations. In the event of a CVCF ESS failure that cannot be operated in a single ESS, the power system is restored by switching roles with the auxiliary ESS. To verify the transient stability analysis, Floriana Island, in the Galapagos Islands of Ecuador, was selected as a sample model, and its simulation model, which made by the PSCAD/EMTDC program, was applied with actual power system parameters such as weather data and power load of the island.
The assumed accident simulation analysis to verify the transient stability improvement effect was performed based on a total of five cases that may occur in the actual microgrid. In the case of transient stability, the operation of the voltage relay and the overload of the inverter-based facilities were checked. The recovery process for the CVCF ESS dropout was also presented compared with the single and multi-ESS cases. As a result of the transient state analysis in multi-ESS based on power balance control, it was confirmed that 130% overload occurred due to the lack of output margin of the CVCF ESS when renewable energy rapidly increased. However, in the proposed method, only a momentary voltage rise was shown.
Therefore, the design method considering transient stability will be able to contribute to stable microgrid operation. And in the event of a long-term failure of the CVCF ESS, it can be economically helpful to the microgrid by the switching roles of auxiliary ESS.
Author(s)
채상헌
Issued Date
2022
Awarded Date
2022. 2
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000010600
Alternative Author(s)
Chae, Sang Heon
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 전기공학전공
Advisor
김일환
Table Of Contents
1. 서 론 1

2. 독립형 마이크로그리드의 ESS 구성 4
2.1 단일 ESS 기반 마이크로그리드 4
2.2 다중 ESS 기반 마이크로그리드 5

3. 과도 안정도를 고려한 다중 ESS 설계 9
3.1 과도 안정도를 고려한 CVCF ESS의 출력 제어 12
3.2 과부하 문제 해소를 위한 보조 ESS의 출력 제어 14
3.3 다중 ESS의 통합 제어기 설계 19
3.4 CVCF ESS 고장에 따른 복구 절차 21

4. 독립형 마이크로그리드 모델링과 해석 23
4.1 실 계통 사례를 반영한 전력 계통 모델링 23
4.1.1 전력부하 모델링 26
4.1.2 분산전원 모델링 29
4.2 ESS 구성 별 컴퓨터 해석 모델링 31
4.2.1 단일 ESS 모델링 32
4.2.2 다중 ESS 모델링 35
4.3 정상상태 해석 결과 39
4.3.1 ESS 최대 충전 구간 40
4.3.2 ESS 저출력 구간 47
4.3.3 ESS 최대 방전 구간 53

5. 설비 사고 사례를 반영한 과도 안정도 분석 60
5.1 CVCF ESS 탈락 60
5.2 신재생에너지 탈락 64
5.3 신재생에너지 출력 급증 70
5.4 전력 부하 급증 78
5.5 전력 부하 탈락 85
5.6 결과 고찰 91

6. 결론 92

참 고 문 헌 94
Degree
Doctor
Publisher
제주대학교 대학원
Appears in Collections:
Faculty of Applied Energy System > Electrical Engineering
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