撬棒保護電路的接入會改變低電壓穿越過程中雙饋感應(yīng)發(fā)電機(DFIG)定轉(zhuǎn)子磁鏈間的耦合過程和耦合強度,由此將影響機組磁鏈衰減動態(tài)和撬棒保護性能。針對這一問題,提出了一種刻畫定子磁鏈與轉(zhuǎn)子繞組交鏈感應(yīng)作用的磁鏈耦合系數(shù),將電網(wǎng)故障后電機的磁鏈暫態(tài)耦合過程處理為不同狀態(tài)的疊加,綜合研究撬棒電阻對轉(zhuǎn)子感應(yīng)磁鏈正序、負序和暫態(tài)反向交流分量幅值和相角的耦合規(guī)律,用轉(zhuǎn)子磁鏈空間矢量圖和矢量軌跡圖描述轉(zhuǎn)子磁鏈動態(tài)響應(yīng)過程。最后,針對電網(wǎng)不對稱故障下撬棒取值的問題,提出了一種基于轉(zhuǎn)子磁鏈幅值配比原理和最優(yōu)傾角的撬棒阻值選取方法。該方法可減小磁鏈耦合不當(dāng)對機組的暫態(tài)沖擊,從而有效改善機組的無功外特性和瞬態(tài)性能。采用MATLAB/Simulink仿真驗證了理論分析和所提方法的正確性。
標(biāo)簽：
雙饋感應(yīng)發(fā)電機
低電壓穿越
撬棒保護
磁鏈動態(tài)特性
磁鏈耦合
上傳時間：
2016-01-01
上傳用戶：icebee251
本文設(shè)計了一種磁致伸縮位移傳感器,介紹了該磁致伸縮位移傳感器的測量原理,通過結(jié)構(gòu)優(yōu)化設(shè)計提高了儀器的性能,詳述了硬件電路設(shè)計及實現(xiàn)方法,完成了軟件設(shè)計,實現(xiàn)了高壓充電、問詢脈沖加載、時間測量及濾波等功能,并通過實驗對其性能進行了驗證。所研制的磁致伸縮位移傳感器具有測量精度高、長期穩(wěn)定性好等特點,滿足了大量程、高精度、惡劣環(huán)境等測量的要求。A kind of sensor based on magnetostrictive principle is designed.The measuring principle of the magnetostrictive displacement sensor is introduced,the performance of the instrument is improved by the structural optimization design,and introduced the hardware circuit design and the realization method,completed the software design,realized the functions of the high voltage charging,inquiries pulse loading,time measurement and filtering,and its performance is verified through the experiment.The magnetostrictive displacement sensor has the characteristics of high measuring precision.The sensor meets the requirements of large range,high precision,poor environment and so on.
標(biāo)簽：
位移傳感器
上傳時間：
2022-04-06
上傳用戶：
