According to the coordination control of a dynamic voltage restorer (DVR) and an
inductive fault current limiter (FCL), this paper proposes an efficient low-voltage
ride-through (LVRT) scheme for a doubly fed induction generator (DFIG) based
wind turbine. The DVR is located to the DFIG’s stator circuit for stabilizing the
terminal voltage and decreasing the generator current. The inductive FCL is
connected to the DFIG’s rotor circuit for suppressing the rotor overcurrent and
protecting the converter. Theoretical discussions on structure, principle and scale
criterion of the combined DVR-FCL are conducted, and simulation analyses of the
proposed approach to handle symmetrical and asymmetrical faults are done in
MATLAB/Simulink. In this study, the dynamic characteristics of the DFIG during
the faults are analyzed from multiple aspects, and a detailed comparison of the
proposed approach and the single action of DVR or FCL is carried out. From the
simulation results, the effectiveness and superiority of the proposed approach are
well demonstrated.

제 1편 : SIMULINK 기본편
1.1 SIMULINK의 시작 1
블록의 연결 5
블록 파라미터의 설정 7
시뮬레이션 파라미터 (Configuration Parameters)의 설정 8
시뮬레이션의 수행 9
블록 파라미터의 표시 9
복수 데이터의 표시 11
2.2 동적 시뮬레이션 13
이차 미분방정식 17
선형 상태변수 모델 23
DC 모터의 시뮬레이션 24
함수 블록의 사용 29
차분방정식(difference equation)의 모델링 34
Subsystem(부시스템)의 구성 37
제 2편 : 연구논문
LVRT capability enhancement of DFIG based wind turbine with
coordination control of dynamic voltage restorer and inductive fault
current limiter
1. Introduction 41
2. Theoretical Presentation of a typical DFIG based WT 44
3. Configuration of the DVR and its effects on the DFIG 45
4. Structure, control and influence of the inductive FCL for the DFIG 47
5. Simulation analysis 49
6. Conclusions 61
7. References 61