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)(存儲版)
【正文】 stability in an electric power system with this type wind turbines． The use of wind energy for electricity generation as a mature technology of renewable energy use patterns have developed AC excited DFIG system and its gridconnected control technology is studied in this paper. KEYWORDS:VSCF,wind power generation,doubly fed,gridconnected In recent years， with the great development in manufacture of power electronic converter and its application technology， the variable speed wind turbine(VSWT)with large capacity has bee one primary technology directions of wind turbines． The VSWT with doubly—fed induction generator(DFIG)which can flexibly join wind turbio power system has turned into mainstream machine in the field of exploring wind energy in the world now． It is therefore important to study the technology， operation characteristics， safety and stability in an electric power system with this type windturbines． In order to explore the new technology of wind power in our country， a project named“The VSWT with large capacity of MW level”has been supported by National High Technology Research and Development Plan(863 plan)． In this dissertation， the dynamic modeling， operation characteristics of VWST with doublyfed generator and voltage—reactive power control strategy of a wind farm in an electric power system are studied based on the sub—project that is entitled as research on operation technology of VSWT with large capacity in an electrical power system and the full analysis on the references from domestic and aboard． The primary contents and original contributions of this dissertation are as follows： Firstly， a simply 3rd order dynamic model for DFIG is developed． The proposed model is adequate to describe dynamic behaviors and is easy to simulate by puter． Since control variables have taken place step changes and gradual changes， a detailed parison of dynamic behaviors is made between the proposed model and exact model in the dissertation． The results are shown that the proposed model has a favorable definition and can substitute the exact model in research on DFIG with high power factor and large range of rotor speed． Therefo
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