本論文之主要目的在研究雙饋式感應風力發電機與配電系統之併聯運轉。文中利用背對背之兩組變流器控制雙饋式感應發電機之工作特性,主要研究內容有兩點,第一為研究電力系統之變動對風力發電機的影響;第二為研究不同風速下風力發電機之最大功率追蹤。 首先針對風力機之特性及雙饋式感應發電機之特性進行分析,其次建立控制方塊圖,再利用脈波寬度調變技術搭配 PI控制器控制背對背變流器,以使雙饋式感應風力發電機同時具備穩定定子端電壓及輸出最大功率之能力。 模擬方面使用MATLAB○R/Simulink/SimPowerSystems軟體模擬整個系統。本論文將模擬出負載變動及風速變動下,雙饋式感應發電機之動態特性。
Dynamic performance of a doubly-fed induction generator(DFIG) connected to a distribution system is investigated in this thesis using a back-to-back converter tocontrol the doubly-fed induction generator. Two major topics are covered in this study. One is the effect of a disturbance in the power system on the dynamicperformance of the DFIG. The other is the maximum power point tracking(MPPT) ofthe DFIG under different wind speeds. The characteristics of wind turbine and doubly-fed induction generator are first studied. Then the control block diagram for the DFIG is established. The real andreactive power outputs of the DFIG are controlled by a back-to back converter using aPI controller and the pulse width modulation(PWM) technology. Dynamic simulations for the system subject to disturbances such as load changes and wind speed variations are conducted MATLAB○R/Simulink/SimPowerSystems. It is concluded from the simulation results that stator voltage can be effectively regulated and maximum power can be extracted from the wind turbine by theproposed DFIGcontroller.
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