外文翻譯--變速恒頻交流勵(lì)磁雙饋風(fēng)力發(fā)電系統(tǒng)及其控制技術(shù)研究-其他專業(yè)(完整版)
【正文】 two layers according the amending control references and tracing control references． Its aims are to ensure safe operation． Simultaneous， it can improve operation efficiency of VSWT,take part in the reactive power optimization of the grid and enhance the voltage stability of power systems． Then taking the example of a wind park lied in north of china， the operation characteristics of single VSWT and voltage characteristics of grid are simulated and analyzed when some disturbances about wind speed emerge and some faults in the systems take place under the control strategy． The results show that the proposed control strategy not only can carry out optimal operation of VSWT but also adequately exert the regulation ability of reactive power of DFIG and so disturbances are balanced and the voltage stability of grid is availably improved， optimal operation of the electric power system is reached． In summary， based on the research status of DFIG at home and aboard， the dynamic modeling and operation characteristics of VSWT are fully analyzed in this dissertation． Then the control strategy of VSWTs in the power systems is acplished and a simulation tool is developed by using MATLAB correspondingly． Thereby， the work makes up of a integrated research at aspect of control strategy about Operation technology of VSWT with large capacity in the grid． References [1] F. Giraud and Z. M. Salameh, “ Winddriven variablespeed, variable frequency, doubleoutput, induction generators,” Electric Mach. Power Syst. , vol. 26, pp. 287297, 1998. [2] M. N. Eskander and M. T. ElHagry, “Optimal performance of double output induction generator used in WECS,”Electric Mach. Power Syst.,vol. 25, pp. 10351046, 1997. [3] E. Akpinar and P. Pillay, “Modeling and performance of slip energy recovery induction motor drives,”IEEE Trans. Energy Conversion, vol. 5, pp. 203210, Mar. 1990. [4]E. Akpinar and P. Pillay, “A puter program to predict he performance of slip energy recovery induction motor drives,”IEEE Trans. Energy Conversion , vol. 5, pp. 357365, June 1990. [5] J. B. Ekanayake, L. Holdsworth, X. Wu, N. Jenkins,“ Dynamic Modelling of Doubly Fed Induction
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