本文關(guān)鍵詞：GMM光纖電流傳感器的研究　出處：《哈爾濱理工大學》2017年博士論文　論文類型：學位論文

  更多相關(guān)文章： 差動式電流傳感器 超磁致伸縮材料 溫度補償 磁滯非線性校正 法布里-珀羅干涉儀

【摘要】：光學電流互感器因為其具有絕緣性好、動態(tài)范圍寬等優(yōu)點被廣泛用于新一代電力系統(tǒng)在線監(jiān)測以及數(shù)字電網(wǎng)的發(fā)展中。利用光纖光柵可靠性高,超磁致伸縮材料Terfenol-D的磁致伸縮系數(shù)高、響應(yīng)速度快等優(yōu)點,由光纖光柵和超磁致伸縮材料組合成電流互感器,可能滿足數(shù)字化電力系統(tǒng)的特定需求。針對GMM-FBG電流傳感器中光纖光柵同時對應(yīng)力和溫度交叉敏感的問題,提出了一種差動式GMM-FBG電流傳感器,由兩個GMM-FBG組合構(gòu)成傳感單元放置在兩個對稱磁路的相鄰氣隙中,并且施加大小相同、方向相反的偏置磁場,當測量電流時,兩個傳感單元將受到不同方向的磁場,獲得差模信號,而在溫度影響下,兩個傳感單元獲得共模信號,系統(tǒng)自動抑制共模信號消除溫度對測量的影響。應(yīng)用這種差動式電流傳感器實現(xiàn)了交流電流的測量。研究了GMM-FBG電流傳感器中GMM材料的磁滯特性影響,首先利用J-A模型與Preisach模型對GMM材料分別進行了建模研究,發(fā)現(xiàn)這些模型的參數(shù)求解過程繁雜,很難實現(xiàn)對電流傳感器磁滯特性的實時校正。因此提出兩種基于圖形學規(guī)律的磁滯非線性校正方法即比例法和頂點坐標擬合法,通過分析已知磁滯忯線的圖形學規(guī)律,來預測未知輸入電流對應(yīng)的滯忯曲線數(shù)學模型,并用它的逆模型對此時電流傳感器解調(diào)出的電壓信號進行磁滯非線性校正從而求出輸入電流信號,最后通過對交流電流的校正,表明采用這種校正方法能準確重建輸入電流信號,與沒校正時相比較,測量范圍內(nèi)的瞬時誤差及幅度誤差降低。針對GMM-FBG差動式電流傳感器分辨力相對較低問題,提出了一種法布里-珀羅干涉儀原理的高靈敏度電流傳感器,待測電流通過調(diào)諧法布里-珀羅干涉儀的腔長,使得輸出信號的頻率與待測電流相同,幅值與待測電流幅值成正比,采用一種基于窄帶分布式反饋半導體激光器的正交強度解調(diào)方法來實現(xiàn)法布里-珀羅干涉儀的腔長解調(diào),最終實驗結(jié)果表明,基于法布里-珀羅干涉儀原理的電流傳感器與差動式GMM-FBG電流傳感器相比,分辨力提高了近16倍。
[Abstract]:The optical current transformer because of its good insulation, the advantages of wide dynamic range is widely used in the new generation of online monitoring of power system and the development of digital power grid. Using fiber grating with high reliability and magnetostriction of magnetostrictive material Terfenol-D high response speed and other advantages, by fiber grating and magnetostrictive combination of materials into current transformer can meet the specific needs of digital power system. According to the fiber grating GMM-FBG current sensor and the stress and temperature cross sensitivity, a differential GMM-FBG current sensor is composed of two GMM-FBG composed of sensing unit disposed adjacent to the air gap two symmetric magnetic circuit, and applying the same size, the direction of the bias magnetic field on the contrary, when measuring current, two sensing units will be subject to different direction of the magnetic field, obtain the differential signal, and the temperature in the The degree of influence, the two sensor unit gain common mode signal, the system automatically suppress common mode signal to eliminate the influence of temperature on the measurement. The application of the differential current sensor to realize the measurement of AC current. Effects of hysteresis characteristics of GMM GMM-FBG current sensor, the GMM materials are modeled using the J-A model and Preisach model, discovery process parameters to solve these models of complex, difficult to achieve real-time correction of the hysteresis current sensor. The two hysteresis nonlinearity correction method based on the graphics of ratio method and vertex coordinate fitting, through the analysis of the known hysteresis Qi line graphics rules, to predict the hysteresis curve Qi mathematical model of unknown input the corresponding current, and the inverse model of the nonlinear hysteresis of voltage signal at the current sensor is demodulated to calculate its correction The input current signal, finally through calibration of AC current, shows that this correction method can accurately reconstruct the input current signal, compared with no correction, reduce the instantaneous error and amplitude error measuring range. The GMM-FBG differential current sensor resolution is relatively low, the high sensitivity interferometer current sensor the principle of a Fabri Perot, the measured current through the tunable Fabri Perot interferometer cavity length, the output signal of the same frequency and amplitude of the current to be measured, and the measured current amplitude is proportional to the intensity demodulation method of orthogonal narrowband distributed feedback semiconductor lasers based on Fabri Perot interferometer cavity length demodulation, the final experimental results show that, compared with the principle of Fabri Perot interferometer current sensor and differential current sensor based on GMM-FBG, resolution It has been improved by nearly 16 times.

【學位授予單位】：哈爾濱理工大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TP212

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本文編號：1398378