【摘要】：現(xiàn)階段我國(guó)經(jīng)濟(jì)和社會(huì)正處于穩(wěn)定和快速發(fā)展時(shí)期,對(duì)于能源需求也是日益增加,特高壓輸電工程技術(shù)在這關(guān)鍵時(shí)期起到非常重要的作用,不僅優(yōu)化了資源配置,還解決了能源不均衡等問(wèn)題,也為我國(guó)執(zhí)行可持續(xù)發(fā)展戰(zhàn)略提供堅(jiān)實(shí)的后盾。但是特高壓輸電電壓隨著發(fā)展的需求而不斷的提升,其輸電線路周邊的電磁環(huán)境也日益不可忽略,本文就對(duì)特高壓直流輸電線路周?chē)姶艌?chǎng)進(jìn)行詳細(xì)的分析,并對(duì)其作出安全評(píng)估,主要包括:直流電場(chǎng),離子流密度,直流磁場(chǎng)等。(1)分析了直流輸電線路下地面標(biāo)稱(chēng)電場(chǎng)分布特征。分別介紹了標(biāo)稱(chēng)電場(chǎng)計(jì)算的方法以及分裂導(dǎo)線轉(zhuǎn)換為等效導(dǎo)線的計(jì)算方法,計(jì)算了在不同的導(dǎo)線結(jié)構(gòu)參數(shù)因素下地面標(biāo)稱(chēng)的分布情況,最后計(jì)算分析了直流磁場(chǎng)的分布情況。(2)首先介紹了計(jì)算離子流場(chǎng)的方法和步驟,其次就是對(duì)有限元軟件并進(jìn)行了有效性驗(yàn)證,最后分析了在不同的導(dǎo)線結(jié)構(gòu)參數(shù)因素下合成電場(chǎng)和離子流密度的分布情況,。(3)對(duì)特高壓直流輸電線路對(duì)人體電磁暴露進(jìn)行了安全評(píng)估,首先介紹了三維離子流場(chǎng)的計(jì)算模型,然后根據(jù)人體組織的電磁特性及生理結(jié)構(gòu),以均勻組織的電導(dǎo)率和介電常數(shù)為基礎(chǔ),在COMSOL中建立了人體簡(jiǎn)化模型。最后分析了特高壓輸電線路下方人體周?chē)鷪?chǎng)強(qiáng)、人體、頭部組織的場(chǎng)強(qiáng)分布特征,并與已知的結(jié)論和現(xiàn)行的ICNIRP安全標(biāo)準(zhǔn)進(jìn)行對(duì)比。結(jié)果表面:由于±1100kV輸電線路正在建設(shè),只能是進(jìn)行預(yù)測(cè)性仿真,本人在仿真過(guò)程中設(shè)置導(dǎo)線離地高度28m,仿真結(jié)果發(fā)現(xiàn),當(dāng)風(fēng)速為0m/s時(shí),人體內(nèi)部電場(chǎng)最大值是5.59V/m,已經(jīng)超過(guò)ICNIRP規(guī)定的普通民眾限值0.4V/m和專(zhuān)業(yè)限制0.8V/m,但大腦內(nèi)部最大電場(chǎng)值0.124V/m在其兩種限值范圍內(nèi),對(duì)于長(zhǎng)期居住在特高壓直流輸電線路周邊的居民會(huì)有一定的健康風(fēng)險(xiǎn),因此在實(shí)際建設(shè)中需采取一定的降低電磁暴露防護(hù)措施或者避免穿越居民區(qū)。
[Abstract]:At the present stage, our economy and society are in a period of stable and rapid development, and the energy demand is also increasing day by day. UHV transmission engineering technology plays a very important role in this critical period, not only optimizing the allocation of resources, It also solves the problem of energy imbalance and provides a solid backing for our country to carry out sustainable development strategy. However, with the development of UHV transmission voltage, the electromagnetic environment around the UHV transmission line can not be ignored day by day. In this paper, the electromagnetic field around UHV HVDC transmission line is analyzed in detail. The safety evaluation includes DC field, ion current density, DC magnetic field and so on. (1) the distribution characteristics of surface nominal electric field under HVDC transmission line are analyzed. The method of calculating the nominal electric field and the calculating method of converting the split wire into the equivalent conductor are introduced, and the distribution of the ground nominal field under different structural parameters of the conductor is calculated. Finally, the distribution of DC magnetic field is calculated and analyzed. (2) the methods and steps of calculating the ion flow field are introduced, and the finite element software is used to verify the validity of the method. Finally, the distribution of synthetic electric field and ion current density under different traverse structure parameters are analyzed. (3) the electromagnetic exposure of UHVDC transmission lines to human body is evaluated. Then, according to the electromagnetic characteristics and physiological structure of human tissue, a simplified human body model is established in COMSOL based on the conductivity and dielectric constant of homogeneous tissue. Finally, the distribution characteristics of field intensity around human body, human body and head tissue under UHV transmission line are analyzed and compared with known conclusions and current ICNIRP safety standards. Results: because 鹵1100kV transmission line is under construction, it can only be predicted by simulation. In the course of simulation, I set the wire height from the ground at 28m. The simulation results show that when the wind speed is 0m/s, The maximum internal electric field in the human body is 5.59 V / m, which already exceeds the ICNIRP limit of 0.8V / m for ordinary people and the professional limit of 0.8V / m, but the maximum electric field value 0.124V/m within the brain is within its two limits. There is a certain health risk for the residents living in the vicinity of UHVDC transmission lines for a long time, so it is necessary to take some protective measures to reduce electromagnetic exposure or avoid crossing residential areas in actual construction.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM75

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本文編號(hào)：2214616