外文翻譯--變速恒頻交流勵磁雙饋風力發(fā)電系統(tǒng)及其控制技術研究-其他專業(yè)-展示頁
2025-01-31 10:00本頁面
【正文】 iscussed in the dissertation. Thirdly， a model of frequency converter that is expressed by four control parameters， that is， modulation ratio and phase difference of converter and inverter is originally presented in this dissertation Meanwhile， a aggregated dynamic model of VSWT is established based on the physical characteristics of posing ponents Then a simulation tool of VSWT is originally developed by using MATLAB． Fourthly， the operation characteristics of VSWT are discussed in this dissertation． At the aspects of steady characteristics， the active power， reactive power and PQ capacity limit are analyzed． At the aspects of dynamic characteristics， the dynamic behaviours are simulated contrastively between VWST and constant speed wind turbine (CSWT)． The results show that VSWT has more superior behaviors． Furthermore， taking the example of VS WT with DFIG connected straight with large grid． the 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 charact
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