特高压直流输电线路电磁环境安全评估
发布时间：2018-08-31 09:45
【摘要】：现阶段我国经济和社会正处于稳定和快速发展时期,对于能源需求也是日益增加,特高压输电工程技术在这关键时期起到非常重要的作用,不仅优化了资源配置,还解决了能源不均衡等问题,也为我国执行可持续发展战略提供坚实的后盾。但是特高压输电电压随着发展的需求而不断的提升,其输电线路周边的电磁环境也日益不可忽略,本文就对特高压直流输电线路周围电磁场进行详细的分析,并对其作出安全评估,主要包括:直流电场,离子流密度,直流磁场等。(1)分析了直流输电线路下地面标称电场分布特征。分别介绍了标称电场计算的方法以及分裂导线转换为等效导线的计算方法,计算了在不同的导线结构参数因素下地面标称的分布情况,最后计算分析了直流磁场的分布情况。(2)首先介绍了计算离子流场的方法和步骤,其次就是对有限元软件并进行了有效性验证,最后分析了在不同的导线结构参数因素下合成电场和离子流密度的分布情况,。(3)对特高压直流输电线路对人体电磁暴露进行了安全评估,首先介绍了三维离子流场的计算模型,然后根据人体组织的电磁特性及生理结构,以均匀组织的电导率和介电常数为基础,在COMSOL中建立了人体简化模型。最后分析了特高压输电线路下方人体周围场强、人体、头部组织的场强分布特征,并与已知的结论和现行的ICNIRP安全标准进行对比。结果表面:由于±1100kV输电线路正在建设,只能是进行预测性仿真,本人在仿真过程中设置导线离地高度28m,仿真结果发现,当风速为0m/s时,人体内部电场最大值是5.59V/m,已经超过ICNIRP规定的普通民众限值0.4V/m和专业限制0.8V/m,但大脑内部最大电场值0.124V/m在其两种限值范围内,对于长期居住在特高压直流输电线路周边的居民会有一定的健康风险,因此在实际建设中需采取一定的降低电磁暴露防护措施或者避免穿越居民区。
[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 卤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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
[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 卤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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
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