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Abstract
This paper presents a new solution for doubly fed induction generators to stay connected to the grid at the time of faults and sags. To create the required flux to keep the rotor side converter current below its transient rating the stator voltage is increased to certain level at the time of faults. In order to maintain that one we are injecting the required voltage in series to the stator side line by designing a series compensator. The series converter will examine the grid voltages and provides compensation accordingly to keep DFIG to continue its operation. . Since the turbine and converter stay connected, the synchronization of operation remains established during and after the fault and normal operation can be resumed immediately after the fault is cleared. . To keep the current at its minimum, a control strategy has been developed to keep the injected voltage and line voltage in phase during and after the fault. The energy efficiency of wind turbine systems equipped with doubly-fed induction generators are compared to other wind turbine generator systems.
KEY WORDS: low-voltage ride-through, DFIG, injected voltage##plugins.themes.academic_pro.article.details##
References
2. J. Morren and S. W. H. de Haan, “Ride through of wind turbines with doubly-fed induction generator during a voltage dip,†IEEE Trans. Energy Convers., vol. 20, no. 2, pp. 435–441, Jun. 2005.
3. J. Morren and S. W. H. de Haan, “Short-circuit current of wind turbines with doubly fed induction generator,†IEEE Trans. Energy Convers.,vol. 22, no. 1, Mar. 2007.
4. R. J. Koessler, S. Pillutla, L. H. Trinh, D. L. Dickmander, “Integration of large wind farms into utility grids (Part 1: Modeling of DFIG),†in the IEEE Power Eng. Soc. Gen. Meeting, Latham, NY, 2003, pp. 1512–1519.
5. D. Xiang, L. Ran, P. J. Tavner, and S. Yang, “Control of a doubly fed induction generator in a wind turbine during grid fault ride-through,†IEEE Trans. Energy Convers., vol. 21, no. 3, pp. 652–662, Sep. 2006.
6. C. Zhan, V. K. Ramachandaramurthy, A. Arulampalam, C. Fitzzer, M. Barnes, and N. Jenkins, “Control of a battery supported dynamic voltage restorer,†IEEE Proc. Transmiss. Distrib., vol. 149, no. 5, pp. 533–542,Sep. 2002.
7. A. Nasiri, “Digital control of three-phase series-parallel uninterruptible power supply systems,†IEEE Trans. Power Electron., vol. 22, no. 4,pp. 1116–1127, Jul. 2007.
8. W.-L. Chen, Y. H. Lin, H. S. Gau, and C. H. Yu, “STATCOM controls for a self-excited induction generator feeding random loads,†IEEE Trans. Power Del., vol. 23, no. 4, pp. 2207–2215, Oct. 2008.
9. K. H. Chu and C. Pollock, “Series compensation on power system with very low harmonic distortion,†IEEE Trans. Power Del., vol. 14, no. 2, pp. 512–518, Apr. 1999.
10. J. Lopez, P. Sanchis, X. Roboam, and L. Marroyo, “Dynamic behavior of the double-feed induction generator during three-phase voltage dips,†IEEE Trans. Energy Convers., vol. 22, no. 3, pp. 709–717, Sep. 2007.
11. J. G. Slootweg and W. L. Kling, “Modeling of large wind farms in power system simulations,†in Proc. IEEE Power Eng. Soc. Summer Meeting, vol. 1, pp. 503–508, 2002. [12] G. Pannell, D. Atkinson, R. Kemsley, L. Holdsworth, P. Taylor, and O.Moja, “DFIG control performance under fault conditions for offshore wind applications,†paper presented at the Int. Elect. Conf. Exhib., Turin, Italy, Jun. 2005.