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계통전압 불평형시 이중여자 유도형 풍력발전 시스템의 동적 모델링 및 제어 기법
- Alternative Title
- An improved control strategy for a DFIG in wind turbines under an unbalanced condition
- Author(s)
- 이솔빈
- Alternative Author(s)
- Lee Sol Bin
- Advisor
- 이교범
- Department
- 일반대학원 전자공학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2010-08
- Language
- kor
- Keyword
- 이중여자유도형풍력발전기; DFIG; 불평형전원; 직류단전압맥동; 토크맥동
- Alternative Abstract
- Wind energy is one of the fastest growing renewable energy systems. The demand for the connection of large-scale wind parks to the power grid is still on the rise. Many large-scale wind parks employ the DFIG with variable speed wind turbines. The main advantage of DFIG wind turbine systems is in the four-quadrant active and reactive power control, and the small converter size. The unbalanced voltages on the grid side converter may produce a large voltage ripple in the dc link voltage, unequal to the non-sinusoidal output currents, unequal heating, and power losses. They may also shorten the lifetime of the dc capacitors in the grid-connected wind turbines with DFIG. A very small unbalanced voltage can create a large unbalanced current. These effects can cause an oscillation of the torque and power in the generator that can lead to speed pulsations, acoustic noise, increased losses and shorter insulation life. The instantaneous oscillation of the three phase active power produces the oscillation in the dc link voltage. The oscillation component has a frequency band which is twice of that of the grid frequency. Based on a symmetrical components analysis, the oscillating torques are the result of the interaction of the different sequence components of the balanced and unbalanced grid voltages and currents. This paper proposes a control method for the DFIG under unbalanced grid voltages. The main purpose is to reduce the torque oscillation and the dc link voltage for the control of both the RSC and the GSC.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Electronic Engineering > 3. Theses(Master)
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