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PACAD/EMTDC를 이용한 가변속 영구자석 풍력발전시스템의 최대출력제어방법에 관한 연구

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초록 moremore
Abstract Wind energy is a promising alternative to the traditional energy sources. The fast development of wind power industry was possible due to the high price of oil and the climate change problems. Also, advanced power electronics devices and control strategies contributed to the booming tren...
Abstract Wind energy is a promising alternative to the traditional energy sources. The fast development of wind power industry was possible due to the high price of oil and the climate change problems. Also, advanced power electronics devices and control strategies contributed to the booming trend by improving the efficiency and reliability of the wind power system in case of grid faults and rapid wind speed change. Up to several years ago, wind turbines were only required to disconnect from the grid when a grid fault was detected, in order to avoid large inrush currents when the voltage recovered. However, with the large portion of the wind power to the grid, such a disconnection of wind turbines could generate severe problems in control of frequency and voltage in the power system and as worst case, a system collapse. It has resulted that the power system operators begin revising and increasing the grid connection requirements in several countries. So, the improvement of the control strategies becomes a new challenge to the manufacturers in order to comply with the grid code requirements during grid faults. It will be required to regulate the active, reactive power and the power factor. First of all, Fault ride-through requirement has been imposed in order to protect the wind turbine and the power system. This paper presents simulation models and analysis of a grid-connected variable speed wind energy conversion system(VSWECS) with permanent magnet synchronous generator and a full scale converter using simulation tool of PSCAD/EMTDC. The power control capabilities of two kinds of control schemes conducted respectively on this wind turbine under two conditions, including rapid wind speed changes and grid faults are compared, and the results show the different power control capabilities of the two control schemes during grid faults. A new control scheme for the wind turbine is a effective measure to improve LVRT capability of VSWECS.
목차 moremore
Abstract i
목차 iii
그림 목차 vi
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Abstract i
목차 iii
그림 목차 vi
표 목차 viii
술어 및 약어 ix

Ⅰ. 개요 1
1.1 연구 배경 1
1.2 연구 목표 4
1.3 논문 구성 5

Ⅱ. 풍력발전시스템 6
2.1 시스템 구성 6
2.2 블레이드 7
2.3 영구자석 동기발전기 9
2.3.1 직접구동형 풍력발전시스템의 특징 9
2.3.2 영구자석 동기발전기의 수학적 모델(3상 좌표계) 10
2.3.3 영구자석 동기발전기의 d-q모델(동기 좌표계) 12
2.4 Back to Back 컨버터 14
2.4.1 Back to Back 컨버터의 기능 14
2.4.2 전압형 컨버터 15
2.4.3 공간벡터 변조방식 17
2.5 필터 21
2.5.1 필터의 종류 21
2.5.2 LCL필터 22
2.5.3 LCL필터 설계시 고려사항 23
2.5.4 LCL필터 설계절차 24

2.6 전력계통 26
2.6.1 계통전원 26
2.6.2 그리드 코드 28
2.6.2.1 보호협조 28
2.6.2.2 고조파 전류 28
2.6.2.3 동기화 29

Ⅲ. 풍력발전 제어시스템 30
3.1 제어시스템 개요 30
3.2 계통측 컨버터 제어 31
3.2.1 전류 제어기 31
3.2.2 직류단 전압 제어기 33
3.2.3 전원 위상각 검출(Phase Locked Loop) 36
3.2.4 무효전력 제어 38
3.3 발전기측 컨버터 제어 39
3.3.1 토크 제어기 39
3.3.2 피치 제어기 41
3.4 제어전략 43
3.4.1 제어전략 A 43
3.4.2 제어전략 B 44


Ⅳ. 풍력발전시스템 시뮬레이션 45
4.1 시뮬레이션 파라미터 45
4.2 시뮬레이션 조건 및 결과 47
4.2.1 정상운전 시 발전특성 47
4.2.1.1 최대출력제어 47
4.2.1.2 피치제어 51
4.2.2 계통사고 시 발전특성 53
4.2.2.1 계통사고 조건1 (3상 지락) 53
4.2.2.2 계통사고 조건2 (2상 지락) 58
4.2.2.3 계통사고 조건3 (1상 지락) 62

Ⅴ. 결론 66

참고문헌 67