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  本文關(guān)鍵詞：特高壓直流輸電線路電磁環(huán)境的預(yù)測研究　出處：《鄭州大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 特高壓直流 電磁環(huán)境 模擬電荷法 合成電場 離子流密度 無線電干擾 可聽噪聲 預(yù)測軟件

【摘要】：特高壓直流(Ultra High Voltage Direct Current,UHVDC)輸電線路以其獨特的優(yōu)點在建設(shè)特高壓電網(wǎng)戰(zhàn)略中發(fā)揮著日益重要的作用。然而它帶來的電磁環(huán)境問題已經(jīng)成為制約其發(fā)展的重要因素。評估UHVDC電磁環(huán)境的參數(shù)有:合成電場、離子流密度、無線電干擾及可聽噪聲。在計算單極輸電線路的電磁環(huán)境時,本文主要計算了合成電場和離子流密度。其中合成電場與導線表面電場和標稱電場相關(guān),因此首先需要計算導線表面電場和標稱電場。本文選用模擬電荷法,首次提出導線表面最大電場相對誤差的判斷依據(jù),在此基礎(chǔ)上對傳統(tǒng)模擬電荷法中模擬電荷的位置和個數(shù)進行優(yōu)化。本文采用優(yōu)化后的模擬電荷法詳細分析了分裂導線數(shù)、子導線分裂間距、子導線橫截面積及導線對地高度等因素對導線表面電場和標稱電場的影響,得出通過合理調(diào)整導線結(jié)構(gòu)參數(shù)可以有效減小二者大小。在計算單極線路的合成電場和離子流密度方面,本文采用解析法詳細分析了子導線分裂間距、子導線橫截面積及導線對地高度等參數(shù)的影響,并給出指導工程實踐的有效結(jié)論。在計算雙極輸電線路的電磁環(huán)境時,主要計算了雙極形式下的合成電場、離子流密度、無線電干擾及可聽噪聲。首先對雙極形式下的表面電場和標稱電場采用優(yōu)化后的模擬電荷法進行了研究分析。在計算雙極線路的合成電場和離子流密度方面,本文采用解析法詳細分析了子導線分裂間距、子導線橫截面積、導線對地高度及極導線間距等參數(shù)的影響,并對輸電線路的選取和架設(shè)提出了合理的參考依據(jù)。在計算無線電干擾和可聽噪聲方面,本文采用EPRI推薦公式進行計算仿真,描述了二者的衰減特性,得出減小電磁環(huán)境影響的措施。為了驗證預(yù)測方法的正確性和合理性,本文將預(yù)測結(jié)果與±800k V哈密-鄭州輸電工程的實測數(shù)據(jù)進行比較,并對二者誤差進行合理分析。在以上研究基礎(chǔ)上,本文采用Visual Studio與MATLAB相結(jié)合的方式編制了UHVDC電磁環(huán)境預(yù)測軟件,以便對UHVDC輸電線路的電磁環(huán)境進行較為直觀的預(yù)測和分析,為今后的環(huán)評工作提供有力的軟件和理論支撐。
[Abstract]:Ultra High Voltage Direct Current. UHVDC). Transmission line plays an increasingly important role in the strategy of building UHV power network with its unique advantages. However, the electromagnetic environmental problems it brings have become an important factor restricting its development. The evaluation of UHVDC electromagnetic loop has become an important factor in its development. The parameters of the boundary are:. Synthetic electric field. Ion current density, radio interference and audible noise. In calculating the electromagnetic environment of a unipolar transmission line. In this paper, the synthetic electric field and ion current density are mainly calculated. The synthetic electric field is related to the surface electric field and the nominal electric field, so it is necessary to calculate the surface electric field and the nominal electric field. In this paper, the simulated charge method is used. The relative error of the maximum electric field on the surface of the conductor is judged for the first time. On this basis, the position and number of simulated charges in the traditional analog charge method are optimized. The number of split conductors and the splitting distance between sub-conductors are analyzed in detail by the optimized simulated charge method. The influence of sub-conductor cross section area and wire height on surface electric field and nominal electric field of conductor. It is concluded that reasonable adjustment of traverse structure parameters can effectively reduce the size of the two. In calculating the synthetic electric field and ion current density of unipolar lines, the splitting distance of sub-conductors is analyzed in detail by analytical method. The influence of the cross-sectional area of the sub-conductor and the conductor on the ground height is given, and the effective conclusions guiding the engineering practice are given. In the calculation of the electromagnetic environment of the bipolar transmission line, the synthetic electric field in the bipolar form is mainly calculated. Ion current density. Radio interference and audible noise. Firstly, the surface electric field and nominal electric field in bipolar form are studied and analyzed by the optimized simulated charge method. The synthetic electric field and ion current density of bipolar circuit are calculated. In this paper, the effect of splitting distance, cross sectional area, wire on ground height and polar wire spacing is analyzed in detail by analytical method. In the aspect of calculating radio interference and audible noise, the EPRI formula is used to calculate and simulate, and the attenuation characteristics of the two methods are described. In order to verify the correctness and rationality of the prediction method, the prediction results are compared with the measured data of 鹵800kV Hami Zhengzhou transmission project. On the basis of the above research, this paper uses Visual Studio and MATLAB to compile the UHVDC electromagnetic environment prediction software. In order to predict and analyze the electromagnetic environment of UHVDC transmission line intuitively, it can provide powerful software and theory support for the future EIA work.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM75;TM721.1

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