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)-全文預(yù)覽
【正文】 operation characteristics are simulated under the different types of wind． It is shown that the proposed model in this dissertation is correct，the design of control objects is rational and it is also indicated that VSWT has a potential to regulate reactive power and voltage． Fifthly． the operation areas of the VSWT with DFIG are analyzed and the general control objects in the ideal situation are made certain in this dissertation． Moreover， a power— voltage control strategy of frequency converter at the coordinate system of rotating stator magic field is originally developed and the general controller is designed in the dissertation． Sixthly． a real optimized operation control strategy of VSWT operation with grid is presented ori ginally in this control strategy is divided into two subsections according to wind speed， and 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
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