本文選題：智能電網(wǎng) + 光學(xué)電流互感器��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：隨著電網(wǎng)向著智能化、數(shù)字化的方向不斷發(fā)展,傳統(tǒng)的電磁式電流互感器由于自身存在著一些不可克服的缺陷,越來(lái)越難以滿足新時(shí)期智能電網(wǎng)對(duì)量測(cè)設(shè)備的要求。光學(xué)電流互感器憑借無(wú)飽和現(xiàn)象、動(dòng)態(tài)范圍大、頻率響應(yīng)寬、絕緣性能好等優(yōu)點(diǎn)越來(lái)越受到人們的關(guān)注。然而在實(shí)際運(yùn)行中,光學(xué)電流互感器(OCT)受磁場(chǎng)分布、溫度、振動(dòng)、光源等多種物理因素影響嚴(yán)重,表現(xiàn)為溫度漂移和運(yùn)行穩(wěn)定性差兩個(gè)方面。因此有必要對(duì)光學(xué)電流互感器的多物理場(chǎng)進(jìn)行研究。 本文首先研究了各種內(nèi)、外部因素對(duì)光學(xué)電流互感器的性能影響機(jī)理,提出時(shí)變的分布化參數(shù)模型。然后分別對(duì)OCT傳感單元的電磁場(chǎng)、溫度場(chǎng)以及光場(chǎng)進(jìn)行了研究并利用有限元分析軟件COMSOL Multiphysics建立相應(yīng)的模型輔助研究。 在電磁場(chǎng)中分析了螺線管聚磁傳感單元的管內(nèi)外磁場(chǎng),提出了一種提高光學(xué)電流互感器抗相間磁干擾能力的新方法-相間磁場(chǎng)正交技術(shù),分析了螺線管聚磁式傳感單元的電磁力問(wèn)題,并在COMSOL建立了螺線管、Ω、平板三種載流形式的電磁場(chǎng)模型,通過(guò)等效的方法研究了電磁力問(wèn)題、分析比較了各載流形式的特點(diǎn)及適用性、仿真結(jié)果表明了相間磁場(chǎng)正交技術(shù)的正確性和有效性；在溫度場(chǎng)中研究了OCT傳感單元的內(nèi)熱源問(wèn)題,并利用熱傳導(dǎo)定律及其邊界條件將這一問(wèn)題數(shù)學(xué)化,并在COMSOL中建立了三種載流形式的內(nèi)熱源問(wèn)題模型,分析比較了不同載流形式下OCT傳感單元受內(nèi)熱源問(wèn)題影響的程度,給出了設(shè)計(jì)優(yōu)化建議；在光場(chǎng)中給出了光波場(chǎng)的概念,研究了光的偏振態(tài)理論和時(shí)諧均勻平面波的復(fù)數(shù)表示方法,并在COMSOL中實(shí)現(xiàn)了OCT傳感單元中偏振光的光波場(chǎng)仿真。 最后在以上基于COMSOL對(duì)光學(xué)電流互感器傳感單元多物理場(chǎng)研究的基礎(chǔ)上,并綜合考慮成本、加工難度與實(shí)用性等因素,設(shè)計(jì)了光學(xué)電流互感器的傳感單元及其殼體,并實(shí)現(xiàn)了樣機(jī)的研制。
[Abstract]:With the development of power grid towards intelligence and digitization, the traditional electromagnetic current transformer has some insurmountable defects, so it is more and more difficult to meet the requirements of measuring equipment in smart grid in the new period. Optical current transformers have attracted more and more attention by virtue of their advantages of non-saturation, wide dynamic range, wide frequency response and good insulation performance. However, in actual operation, optical current transformer (Oct) is seriously affected by many physical factors, such as magnetic field distribution, temperature, vibration, light source and other physical factors, such as temperature drift and poor operation stability. Therefore, it is necessary to study the multi-physical field of optical current transformer. In this paper, the influence mechanism of various internal and external factors on the performance of optical current transformer is studied, and a time-varying distributed parameter model is proposed. Then the electromagnetic field, temperature field and light field of Oct sensor unit are studied, and the corresponding model is established by using the finite element analysis software COMSOL Multiphysics. The magnetic field inside and outside the solenoid sensor unit is analyzed in the electromagnetic field. A new method to improve the ability of optical current transformer to resist the interphase magnetic interference is proposed, which is called the orthogonal technique of interphase magnetic field. The electromagnetic force of solenoid poly-magnetic sensing unit is analyzed, and the electromagnetic field models of solenoid, 惟 and plate are established in COMSOL. The electromagnetic force is studied by equivalent method. The characteristics and applicability of each current carrying form are analyzed and compared. The simulation results show the correctness and validity of the orthogonal technique of magnetic field between phases, and the internal heat source of Oct sensor unit is studied in the temperature field. By using the law of heat conduction and its boundary conditions, this problem is mathematized, and three kinds of internal heat source models are established in COMSOL, and the influence of Oct sensor unit on the internal heat source problem is analyzed and compared under different current carrying forms. The design optimization suggestion is given, the concept of optical wave field is given in the light field, the theory of polarization state of light and the complex representation method of time-harmonic uniform plane wave are studied, and the optical wave field simulation of polarized light in Oct sensor unit is realized in COMSOL. Finally, the sensor unit and its shell of optical current transformer are designed based on COMSOL and considering the cost, processing difficulty and practicability. The prototype is developed.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM76;TM452

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