沈阳于洪区配电网智能化改造分析研究

发布时间：2018-05-30 08:42

本文选题：农电公司 + 无功补偿　；参考：《华北电力大学》2017年硕士论文

【摘要】：随着城郊的高速发展,低压线路的配变容量负荷发生大幅度增长,原有供配电线路造成诸多问题,如线路负荷问题、线路布置不合理、接线方式不合理、电能质量不达标、线损率高,成为制约城市发展的阻碍。针对这一现状,近年来国家及电网接连相关产业政策,2015年8月,我国出台了配电网建设改造行动计划,并提出了2015-2020年,配电网建设改造投资不低于2万亿元,其中2015年投资不低于3000亿元,“十三五”期间累计投资不低于1.7万亿元,并规定供电公司的资金首先必须投资于电网改造。2016年1月,我国能源局进一步出台了《配电网规划设计技术导则》DL/T 5729-2016、《中低压配电网改造技术导则》DL/T 599-2016和《县域配电自动化技术导则》DL/T 390-2016等三项配电网相关标准,并规定新标准于2016年6月1日起实施。通过分析了沈阳市于洪区供电公司的电力现状,得出了目前数线路存在着严重的线损和电流、电压等电能质量问题。且变电站存在老化,设计不合理,联网率低,自动化程度没有的尴尬程度与国家2020年的要求相距甚远。以范屯地区为例部分线路最大负荷电流389A;部分线路末端电压8.9KV,平均线损率10%以上,造成国家电力的不安全隐患同时浪费大量电能。基于此本文依据国家政策和相关要求针对沈阳市于洪区供电公司的电力线路改造进行深入分析,首先本文分析了农电公司供配电线路的现状,并调研了国家改造技术标准及其基础理论知识。其次结合本文依托国家改造建设标准针对范屯地区农村电网进行示范改造,主要体现在变电站设计改造、线径改造、无功补偿、馈线自动化改造等,依托新标准进行的改造目前国内外并无相关综合性研究报道,本文的研究成果可为后续沈阳于洪区供电公司和其它相关电力公司配电网改造提供借鉴。最后分析了改造后的平均功率因子只有0.88,平均线损率依然高达10%,电压合格率达到99%,年节约电量达到1.06MWh。总改造成本线路改造成本为644万元,无功补偿改造成本为78.31万元,总成本722.31万元,十年累计节约购电费用4240万元,经济效益高达2841万元,具有巨大的经济效益。
[Abstract]:With the rapid development of suburbs, the load of distribution and transformer capacity of low-voltage lines has increased greatly, and the original power supply and distribution lines have caused many problems, such as line load problem, unreasonable line layout, unreasonable wiring mode, and the power quality is not up to standard. High line loss rate has become an obstacle to the development of the city. In view of this situation, in recent years, the national and power grid related industrial policies have been successively introduced. In August 2015, China issued the plan of action for the construction and transformation of distribution network, and put forward 2015-2020, the investment in the construction and transformation of distribution network is not less than 2 trillion yuan. The investment in 2015 is no less than 300 billion yuan, and the cumulative investment during the 13th Five-Year Plan period is no less than 1.7 trillion yuan, and it is stipulated that the funds of power supply companies must first be invested in the transformation of the power grid. China's Energy Bureau has further issued three related standards for distribution networks, such as "Technical guidelines for Distribution Network Planning and Design" DL/T 5729-2016, "Technical guidelines for medium and low Voltage Distribution Network Transformation" DL/T 599-2016 and "County area Distribution Automation Technical guidelines" DL/T 390-2016. The new standards will come into effect on June 1, 2016. Based on the analysis of the current situation of power supply company in Yuhong District of Shenyang City, it is concluded that there are serious power quality problems such as line loss, current and voltage in the current number of lines. And the substation has aging, unreasonable design, low networking rate, no degree of automation embarrassment degree is far from the national requirements in 2020. Taking Fantun area as an example, the maximum load current of some lines is 389A, the terminal voltage of some lines is 8.9 KV, and the average line loss rate is more than 10%, which results in the unsafe hidden trouble of national electric power and the waste of a lot of electric energy. Based on this, according to the national policy and related requirements of Shenyang Yuhong District Power supply Company's power line transformation in-depth analysis, first of all, this paper analyzes the current situation of agricultural power supply and distribution lines, And has investigated the national transformation technical standard and its basic theory knowledge. Secondly, based on the national reconstruction standards, the rural power grid in Fantun area is demonstrated, which is mainly reflected in substation design transformation, line diameter transformation, reactive power compensation, feeder automation transformation, etc. There are no comprehensive research reports at home and abroad based on the new standard. The research results of this paper can be used as a reference for Shenyang Yuhong District Power supply Company and other related power companies to rebuild the distribution network. Finally, it is analyzed that the average power factor is only 0.88, the average line loss rate is still as high as 10%, the pass rate of voltage is 99%, and the annual power saving reaches 1.06MWh. The total cost of revamping is 6.44 million yuan, the cost of reactive power compensation is 783100 yuan, the total cost is 7.2231 million yuan, the total cost of electricity purchase is 42.4 million yuan, and the economic benefit is 28.41 million yuan.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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