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MMC의 가변 직류링크전압 제어에 의한 풍력발전단지의 직류 연계 운전

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Alternative Title
Operation of DC Grid Connection for Wind Farm with the Variable DC Link Voltage Control of MMC
Abstract
An offshore wind farm has many advantages such as a high and steady wind speed. However, economically it is hugely problematic. In order to reduce the installation costs of an offshore wind farm, many topologies for high-voltage direct current transmission system (HVDC) have been researched and analyzed by researchers from around the world. DC series topology is one of the solutions for offshore wind farm about grid connection. In this method, the DC link voltage is created from the output voltage of the combined wind turbines connected to each other by the DC series. Because this method can get rid of the need for an offshore platform, which plays a role as a booster or AC/DC converter, it eliminates the need to spend on the installation costs, operation, and management of an offshore platform. However, the DC link voltage of a DC series connected to a wind farm may not be constant due to the variable wind speed. One wind turbine alone must be able to generate a high DC link voltage in order to transfer wind power to grid stably. From this perspective, this thesis proposes the operation of a DC series connected wind farm by using a tap changer transformer technique with modular multilevel converter (MMC)-HVDC. In this study, the wind farm would have a variable DC link voltage based on the number of operating wind turbines. In order to verify the proposed method, a simulation will be conducted for two situations : First, the random step operation of a wind farm. Second, the operation of the wind farm with variable wind speeds. The proposed method will be applied to a 120 MW wind farm with forty wind turbines. The simulation will be carried out by using the PSCAD/EMTDC program.
Author(s)
채상헌
Issued Date
2017
Awarded Date
2017. 8
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000008196
Alternative Author(s)
Chae, Sang Heo
Affiliation
제주대학교 대학원
Department
대학원 에너지응용시스템학부 전기공학전공
Advisor
김일환
Table Of Contents
그림 목차 iv
표 목차 vi
SUMMARY vii
1. 서 론 1
2. 시스템 제어 이론 4
2.1 PMSG용 컨버터 제어 4
2.1.1 PMSG 측 컨버터 제어 5
2.1.2 정류기 측 컨버터 제어 6
2.2 탭 절환 변압기 제어 8
2.3 MMC 제어 9
2.3.1 유·무효전력 제어 12
2.3.2 직류 링크 전압 제어 18
3. 모델링과 컴퓨터 해석 21
3.1 모델링 21
3.1.1 PMSG 모델링 22
3.1.2 탭 절환 변압기 모델링 23
3.1.3 MMC 모델링 26
3.2 컴퓨터 해석 28
3.2.1 직렬 연결 풍력발전기의 순차적 운전 30
3.2.2 가변 풍속에 따른 풍력발전단지 운전 31
4. 결과 및 고찰 33
4.1 컴퓨터 해석 결과 33
4.2.1 직렬 연결 풍력발전기의 순차적 운전 33
4.2.2 가변 풍속에 따른 풍력발전단지 운전 36
4.2 결과 고찰 39
5. 결론 42
참 고 문 헌 43
Degree
Master
Publisher
제주대학교 일반대학원
Citation
채상헌. (2017). MMC의 가변 직류링크전압 제어에 의한 풍력발전단지의 직류 연계 운전
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Faculty of Applied Energy System > Electrical Engineering
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