【摘要】：我國處于地震活動多發(fā)區(qū)域，遍布各地的地震電磁監(jiān)測臺承擔著預報和監(jiān)測地震活動的重要任務。然而，隨著越來越多的特高壓輸電線路建設(shè)和投運，已無法避免對線路周邊地震電磁觀測臺站產(chǎn)生一定的電磁干擾。本文針對直流輸電系統(tǒng)對地震臺地電場觀測的電磁干擾進行了較為深入的研究，分析了直流輸電系統(tǒng)對地電場觀測影響的干擾機理，提出了入地電流在復合3維土壤中電位分布模型，推導了該模型下電位的求解方法，并由此開發(fā)了直流輸電線路對地電場觀測干擾的校正系統(tǒng)。主要內(nèi)容如下： （1）分析了地電場觀測儀器的工作原理，并研究了直流輸電系統(tǒng)干擾地電場觀測的特點，認為直流輸電線路合成場、離子流入地和接地極入地電流是干擾的影響因子。 （2）基于Deutseh假設(shè)法，通過仿真計算和現(xiàn)場實測驗證的方法，研究了合成場及離子流的橫向衰減規(guī)律，認為離子流入地可能微弱影響地電場觀測，并引起觀測干擾幅值的不確定性，但對千米外的地電場觀測來說，直流線路的存在不會引起干擾。 （3）建立了接地極入地電流在復合3維土壤中的電位分布模型，，得到了由泰勒公式展開的無窮階級數(shù)構(gòu)成的多層土壤結(jié)構(gòu)格林函數(shù)，根據(jù)復數(shù)鏡像法，推導了接地極入地電流在復合3維土壤模型中任一點的電位計算公式。研究表明，直流輸電線路入地電流為地電場觀測干擾的決定性影響因子。 （4）在±800kV錦屏-蘇南特高壓直流輸電線路帶電調(diào)試期間，由中國電力科學研究院（武漢）、三峽大學、中國地震局地震研究所組織，通過換流站、地震臺站和野外布點聯(lián)合觀測的方式，分別開展了特高壓直流線路、接地極對地電場觀測干擾實驗。對比分析仿真計算結(jié)果和實驗數(shù)據(jù)，發(fā)現(xiàn)干擾計算模型最大誤差不超過15%，并由此開發(fā)了“直流輸電線路對地電場觀測干擾校正系統(tǒng)”。
[Abstract]:Our country is in the area of frequent seismicity, and the seismic electromagnetic monitoring stations all over the place undertake the important task of predicting and monitoring seismic activity. However, with more and more UHV transmission lines being constructed and put into operation, it is impossible to avoid some electromagnetic interference to the seismic electromagnetic observation stations around the lines. In this paper, the electromagnetic interference (EMI) caused by DC transmission system to geoelectric field observation is studied deeply, and the interference mechanism of HVDC system on geoelectric field observation is analyzed. In this paper, a potential distribution model of earth current in composite 3D soil is proposed, and the solution method of potential under this model is derived, and a correction system for the interference of DC transmission line to earth electric field observation is developed. The main contents are as follows: (1) the working principle of the geoelectric field observation instrument is analyzed, and the characteristics of the interference geoelectric field observation of HVDC transmission system are studied, and the composite field of HVDC transmission line is considered. The ion flow into the ground and the earth current at the earth pole are the influencing factors of the interference. (2) based on Deutseh hypothesis, the transverse attenuation law of synthetic field and ion current is studied by simulation and field measurement. It is considered that ion flow may have a weak effect on the observation of geoelectric field. It also causes uncertainty of the amplitude of the observed interference, but for geoelectric field observation over a kilometer away, the existence of DC line will not cause interference. (3) the potential distribution model of earth current in complex 3D soil is established, and the Green's function of multi-layer soil structure, which is composed of infinite class number of Taylor's formula, is obtained, according to complex image method. The formula for calculating the potential of the earth current at any point in the composite 3D soil model is derived. The results show that the earth current of DC transmission line is the decisive factor of the earth electric field observation interference. (4) during the commissioning of 鹵800kV Jinping-Sunan UHVDC transmission line, it was organized by the China Institute of Electric Power Sciences (Wuhan), the three Gorges University, and the Seismological Research Institute of the China Seismological Bureau. The interference experiments of UHV DC line and earth pole to earth electric field observation were carried out in the way of joint observation of seismic stations and field distribution points. By comparing the simulation results with the experimental data, it is found that the maximum error of the interference calculation model does not exceed 15%, and a "interference correction system for DC transmission line to earth electric field observation" is developed.
【學位授予單位】：三峽大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM721.1

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