d-q 등가회로를 이용한 이중여자 유도발전기 보호

다국어 초록 (Multilingual Abstract)

A doubly-fed induction generator (DFIG) system has been widely used in the modem wind turbines due to variable-speed operation, high efficiency and small converter size. It is well known that an inter-tum fault of a generator is very difficult to be detected. The DFIG system uses a wound rotor induction machine so that the magnetizing current of the generator can be fed from both the stator and the rotor. This paper proposes a protection algorithm for a DFIG using the d-q equivalent circuit in the time domain. In the case of a DFIG, the voltages and currents of the rotor side as well as the voltages and currents of the stator are available. The proposed algorithm estimates the instantaneous (i.e., converted into the stationary frame) induced voltages from the rotor and the stator sides. If the difference between the two estimated induced voltages exceeds the threshold, the proposed algorithm detects the inter-turn fault. The algorithm can detect a inter-turn fault of a winding. The performance of the proposed algorithm is validated using a PSCAD/EMTDC simulator under inter-turn fault conditions and normal operating conditions such as an external fault and the change of the wind speed.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. d-q 등가회로를 이용한 DFIG 보호계전방식
• 3. 사례 연구
• 4. 결론
• 감사의 글
• 참고문헌
• 저자소개

참고문헌 (Reference)

1 정병창, "풍력 터어빈 모의 실험을 위한 가변 토오크 입력형 시뮬레이터" 51 (51): 467-474, 2002

2 A. R. Bergen, "Power System Analysis 2nd edition" 514-516, 2000

3 Zexiang Cai, "Modelling for Interior Faults of Induction Motors and Its Simulation on EMTDC" IPST 2003 in New Orleans, USA. 2003

4 Generator Protection, "IEEE Recommended practice for protection and coordination of industrial and commercial power systems"

5 J. B. Ekayanake, "Control of Doubly Fed Induction Generator(DFIG) Wind Turbines"

6 L. H. Hansen, "Conceptual survey of Generators and Power Electronics for Wind Turbines" Risoe-R-1205(EN), Risoe National laboratory 2001

7 P. C. Krause, "Analysis of Electric Machinery and Drive Systems" 2002