节能导线特性及其在输电线路中的应用分析

发布时间：2018-05-16 06:02

本文选题：输电线路损耗 + 节能导线　；参考：《山东大学》2017年硕士论文

【摘要】：国内电力行业在近年来得到了迅速发展,输电网络中的骨干网络的电压等级逐步向超高压乃至特高压发展。当在超远距离电能输送过程中选用高压输电时,线路电能损耗的出现在所难免。随着绿色经济概念的提出和发展,在保证用户电能正常输送的前提下,如何尽量降低输电线路的损耗、发电过程中温室气体的产生和输变电的成本,近年来成为电力行业一个备受关注的主题。在电能输送过程中,电力线路是电能主要的载体。由于输电线路内外因素的影响,电能输送过程中每一个电压等级、每一个输送环节,都会产生电能输送损耗。所以,在满足用户用电要求的前提下,如何尽量降低输电线路输送电能过程中的电能损耗得到高度关注。导线的型号选择一直以来备受关注,导线的型号选择是提升高电压远距离输电线路关键技术的重要课题。传统的输电线路工程建设的技术经济性主要以前期一次性的费用和设备的投入作为评价的主要考虑因素,但这种评价方式存在诸多的问题和不足,很多关键性的因素都可能会被忽略掉,基于此种评价方式选择的导线往往不是最优导线。本文从电气特性和机械特性两个角度对候选节能导线进行评价、筛选,根据不同节能导线的综合性能并结合实际工程情况,选出最优导线。由于影响输电线路损耗的最主要因素是输电线路的直流电阻,本文以此为出发点,将输电导线的直流电阻作为主要考察对象,研究钢芯高导电率铝绞线(ACSHC)(63%IACS硬铝)、铝合金芯高导电率铝绞线(LHA1)(62.5%IACS硬铝)、中强度铝合金绞线(MIAAC)(热处理型)、钢芯铝成型绞线(AMSCSC)和碳纤维复合芯导线(ACCC)(63%IACS软铝)等五种节能导线,并确定不同输电导线的结构和参数,对比分析输电导线的电气特性和机械特性,并计算输电线路在使用五种不同型号的节能导线时线路的损耗情况。本课题的最后以新建110kV输电线路工程和改造110 kV输电线路工程的选线为例进行线路工程选线对比分析,从电气特性、机械特性以及工程施工等多个不同方面对比分析所研究的五种不同型号节能导线在新建工程和改造工程中的实际应用情况,对比评选出最优的节能导线的选型方案,使该方案能够在最大程度保证电力系统供电量要求和系统安全可靠运行的前提下达到经济最优的目的。通过以实际新建输电线路工程选线和改造输电线路工程选线为例对整个输电线路工程选线过程进行分析,分析结果证明了输电线路节能导线的正确选用对输电工程中电能损耗的降低具有十分重要的实际工程应用价值。同时,本课题的输电线路导线选型研究也为输电线路中节能导线的选线提供了一定的参考。
[Abstract]:The domestic electric power industry has been developed rapidly in recent years, and the voltage grade of the backbone network in the transmission network is gradually developing to the ultra high voltage (UHV) and even the UHV (UHV). When high voltage transmission is selected in the process of ultra long distance power transmission, the power loss of transmission line is inevitable. With the development and development of the concept of green economy, how to reduce the loss of transmission line, the generation of greenhouse gas and the cost of transmission and transformation in the process of power generation, on the premise of ensuring the normal transmission of electricity to users, In recent years, power industry has become a subject of great concern. In the process of electric power transmission, electric power line is the main carrier of electric energy. Because of the influence of the internal and external factors of the transmission line, every voltage grade and every transmission link will produce the power transmission loss in the process of power transmission. Therefore, how to reduce the power loss in the transmission line is highly concerned on the premise of meeting the requirements of users. The model selection of conductors has been paid more and more attention. The selection of conductors is an important issue in improving the key technology of high voltage long distance transmission lines. The technical economy of the traditional transmission line construction mainly takes the one-time cost and the input of the equipment as the main consideration factor, but there are many problems and shortcomings in this evaluation method. Many key factors may be ignored, and the traverse chosen based on this evaluation method is not the optimal one. In this paper, the candidate energy saving conductors are evaluated and screened from the aspects of electrical and mechanical characteristics, and the optimal conductors are selected according to the comprehensive performance of different energy saving conductors and combined with the actual engineering conditions. Since the most important factor affecting the loss of transmission lines is the DC resistance of transmission lines, this paper regards the DC resistance of transmission lines as the main object of investigation. Five kinds of energy saving conductors, such as high conductivity aluminum strands (ACSHCI), aluminum alloy core high conductivity aluminum strands (LHA1 / 62.5), medium strength aluminum alloy strands (heat treatment type), steel core aluminum forming strands (AMSCSCC) and carbon fiber composite core conductors (ACCCU / 63IACS soft aluminum), are studied in this paper. The structure and parameters of different transmission lines are determined, the electrical and mechanical characteristics of transmission lines are compared and analyzed, and the losses of transmission lines are calculated when five different types of energy-saving conductors are used. In the end of this paper, the author takes the new 110kV transmission line project and the reconstruction of 110kV transmission line project as an example to carry on the line engineering line selection contrast analysis, according to the electric characteristic, Comparing and analyzing the practical application of five different types of energy saving conductors in the new construction and reconstruction projects, comparing and selecting the optimal type selection scheme of the energy saving conductors, the mechanical characteristics and the engineering construction are compared and analyzed in this paper. This scheme can ensure the power supply requirement of power system and the safe and reliable operation of the system to the maximum extent to achieve the purpose of economic optimization. The whole process of line selection of transmission line project is analyzed by taking the actual newly built transmission line project as an example and the reconstruction transmission line project as an example. The results show that the correct selection of energy saving conductors for transmission lines has very important practical application value for the reduction of power loss in transmission projects. At the same time, the selection of transmission line conductors in this topic also provides a certain reference for the selection of energy-saving conductors in transmission lines.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

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