發(fā)布時間：2018-01-29 03:07

  本文關(guān)鍵詞： 交直流并行 三維鐵塔 電場逆問題 主元加權(quán)—修正Newton法　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟的發(fā)展，對電力的需求急劇增加，，但是經(jīng)濟發(fā)展和資源的分布極不均衡。建設(shè)特高壓直流輸電工程，可以更合理的對能源和資源進行分配，解決能源短缺和經(jīng)濟發(fā)展的矛盾。但是隨著人們環(huán)保意識的逐步增強，要求我們在建設(shè)特高壓直流輸電工程的同時必須考慮輸電線路產(chǎn)生的電磁場對環(huán)境的影響，盡可能的滿足環(huán)保的要求。因此，準(zhǔn)確計算特高壓直流輸電線路下方的合成電場強度，可以為線路的設(shè)計布局和環(huán)境評估提供參考，具有重要的實際意義。 本文基于模擬電荷法對特高壓直流輸電線路的地面合成電場數(shù)值計算方法展開了研究，主要工作如下： （1）根據(jù)模擬電荷法的基本原理，基于Deutsch假設(shè)的計算方法，計算了特高壓直流輸電線路下方地面合成電場強度，與實測數(shù)據(jù)進行對比，驗證了方法的正確性。 （2）考慮到不可避免的交直流輸電線路并行的情況，分析了交流輸電線路對直流輸電導(dǎo)線表面電場及其電力線軌跡的影響，對基于Deutsch假設(shè)的計算方法進行了改進，從而計算出在鄰近交流輸電線路時直流線路下的地面合成電場及混合電場強度，通過與文獻中實例進行對比，驗證了方法的有效性；分析了交直流并行線路的參數(shù)（鄰近間距）對地面合成電場及混合電場的影響。 （3）采用線單元模擬電荷法對直流輸電線下地面合成電場進行了三維計算，與實測數(shù)據(jù)進行對比，驗證了方法的正確性。對鐵塔建立了數(shù)學(xué)模型，計算了鐵塔附近的地面電場,并以此方法分析了鐵塔對直流輸電線路下方地面合成電場的影響。 （4）研究了特高壓直流輸電線路下方地面合成電場的逆問題計算方法，提出了一種主元加權(quán)—修正Newton法，對合成電場的逆問題進行了計算。通過與主元加權(quán)法及阻尼最小二乘法進行對比，驗證了本方法的有效性及更高的精確度。 （5）采用本文提出的主元加權(quán)-修正Newton法對測點個數(shù)進行了對比分析。當(dāng)測點個數(shù)在8個左右時，采用該方法可以很好的計算出所測輸電線路下方其他點處的合成電場強度。這種方法使得在環(huán)境測評時可以大大減小測量工作，獲得一個可信的地面合成電場詳細分布。
[Abstract]:With the development of economy in our country, the demand for electric power increases sharply, but the economic development and the distribution of resources are very uneven. The construction of UHV HVDC transmission project can allocate energy and resources more reasonably. To solve the contradiction between energy shortage and economic development. But with the increasing of people's awareness of environmental protection. In order to meet the requirements of environmental protection, we must consider the impact of electromagnetic field on the environment while building UHVDC project. The accurate calculation of the composite electric field intensity under UHVDC transmission lines can provide a reference for the design layout and environmental assessment of UHVDC transmission lines, which is of great practical significance. Based on the simulation charge method, this paper studies the numerical calculation method of ground synthetic electric field of UHVDC transmission line. The main work is as follows: 1) according to the basic principle of simulated charge method and the calculation method of Deutsch hypothesis, the ground composite electric field intensity under UHVDC transmission line is calculated and compared with the measured data. The correctness of the method is verified. (2) considering the inevitable parallelism of AC / DC transmission lines, the influence of AC transmission lines on the surface electric field of HVDC conductors and their power line trajectories is analyzed. The calculation method based on Deutsch hypothesis is improved to calculate the ground composite electric field and the mixed electric field intensity under the direct current transmission line adjacent to AC transmission line. The validity of the method is verified by comparison with the examples in the literature. The influence of the parameters of AC / DC parallel circuit (proximity distance) on the ground composite electric field and mixed electric field is analyzed. 3) Three-dimensional calculation of the ground synthetic electric field under DC transmission line is carried out by using the line element simulation charge method, and the correctness of the method is verified by comparing with the measured data. The mathematical model of the tower is established. The ground electric field near the tower is calculated and the influence of the tower on the ground composite electric field under the DC transmission line is analyzed by using this method. In this paper, the inverse calculation method of ground composite electric field under UHVDC transmission line is studied, and a principal component weighted modified Newton method is proposed. The inverse problem of the synthetic electric field is calculated and compared with the principal component weighting method and the damped least square method to verify the effectiveness and higher accuracy of this method. 5) the number of measured points is compared and analyzed by using the principal component weighted modified Newton method proposed in this paper, when the number of measured points is about 8. By using this method, the synthetic electric field intensity at other points under the measured transmission line can be well calculated. This method can greatly reduce the measurement work in environmental assessment. A credible ground synthetic electric field detailed distribution is obtained.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1

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本文編號：1472338