發(fā)布時(shí)間：2018-09-18 09:06

【摘要】：隨著我國(guó)高壓直流輸電工程的快速發(fā)展,國(guó)內(nèi)?500kV超高壓直流輸電技術(shù)已廣泛應(yīng)用,?800kV特高壓直流輸電線路也已投入運(yùn)行。絕緣問題是特高壓直流輸電最為核心的關(guān)鍵問題,由于高壓直流輸電存在由離子流場(chǎng)產(chǎn)生的大量空間電荷對(duì)絕緣子沿面閃絡(luò)存在較大影響,因此直流輸電線路絕緣子設(shè)計(jì)時(shí)需要對(duì)其進(jìn)行考慮。本文研究了直流輸電線路離子流場(chǎng)數(shù)值計(jì)算方法,并利用上流元法對(duì)直流輸電線路離子流場(chǎng)進(jìn)行數(shù)值計(jì)算求解,同時(shí)分析了特定條件下直流輸電離子流場(chǎng)的空間電荷分布,對(duì)絕緣子運(yùn)行參數(shù)的影響。本文首先通過對(duì)離子流場(chǎng)的理論分析,根據(jù)麥克斯韋方程推導(dǎo)離子流場(chǎng)的數(shù)學(xué)模型及邊界條件,并利用上流元方法中來解決迭代求解流程中可能出現(xiàn)的不收斂問題,使得迭代過程能夠較快完成;然后采取有限元方法來求解數(shù)學(xué)模型;最后采用matlab編寫程序?qū)崿F(xiàn)功能,通過與同軸圓柱結(jié)構(gòu)的解析解的對(duì)比來驗(yàn)證該計(jì)算方法的有效性,實(shí)現(xiàn)上流有限元方法求解直流輸電線路的地面合成電場(chǎng)及空間離子流密度。本文分析了風(fēng)速、導(dǎo)線高度、導(dǎo)線電壓等級(jí)對(duì)離子流場(chǎng)的影響,結(jié)果表明:導(dǎo)線高度、電壓等級(jí)對(duì)地面附近離子流影響較大;同時(shí)空間電荷對(duì)絕緣子表面電場(chǎng)及電壓分布也存在一定影響。本文的研究成果可以為高壓直流輸電工程的電磁環(huán)境評(píng)估提供基礎(chǔ),同時(shí)可以進(jìn)一步對(duì)高壓直流線路絕緣子在復(fù)雜大氣條件下的閃絡(luò)研究提供指導(dǎo)。
[Abstract]:With the rapid development of HVDC project in China, the UHV HVDC transmission line of 500kV has been widely used in China. Insulation is the key problem of UHV HVDC transmission. Due to the existence of a large number of space charges generated by ion current field in HVDC transmission, the flashover of insulators is greatly affected. Therefore, it is necessary to consider the insulator design of HVDC transmission line. In this paper, the numerical calculation method of ion current field of HVDC transmission line is studied, and the numerical solution of ion flow field of HVDC transmission line is obtained by using upper current element method. The space charge distribution of ion flow field in HVDC transmission line is also analyzed under certain conditions. The influence on the operation parameters of insulator. In this paper, through the theoretical analysis of ion flow field, the mathematical model and boundary conditions of ion flow field are derived according to Maxwell's equation, and the non-convergence problem that may occur in the iterative solution process is solved by using the upper current element method. The iterative process can be completed quickly, and then the finite element method is adopted to solve the mathematical model. Finally, matlab is used to write a program to realize the function. The validity of the method is verified by comparing with the analytical solution of the coaxial cylindrical structure. The upper current finite element method is realized to solve the ground synthetic electric field and the spatial ion current density of HVDC transmission lines. In this paper, the influence of wind speed, wire height and conductor voltage grade on the ion flow field is analyzed. The results show that the wire height and voltage grade have great influence on the ion current near the ground. At the same time, space charge also affects the electric field and voltage distribution on the surface of insulator. The research results in this paper can provide a basis for the electromagnetic environment assessment of HVDC transmission projects, and also provide guidance for the study of the flashover of HVDC line insulators under complex atmospheric conditions.
【學(xué)位授予單位】：沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75;TM216

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本文編號(hào)：2247435