农网三相负荷不平衡对线损影响的研究及编程实现
发布时间：2018-08-07 20:20
【摘要】：线损率是电力部门的一项重要技术经济指标,它的高低直接与电力企业的技术、管理水平相关联。我国拥有世界上规模最大的农村电力网,农网用户基数巨大,覆盖面积广,并且考虑农网本身复杂的特点以及理论线损计算过程中需要克服众多困难,例如线路结构参数不完整、农网设备陈旧、需要采集的原始数据过多等。基于以上因素,提高农网线损计算的精度和效率,是一个值得深入研究的重要课题。本文是在与湖南省临湘市电力局合作项目“公变电台区理论线损计算”的基础上完成的,主要内容是关于三相负荷不平衡对理论线损影响的研究。首先,对临湘市电力局的运行数据进行采集,同时实地测绘记录临湘市台区线路结构数据。其次,由绘制的负荷曲线图划分了三相负荷不平衡的类型,分析了三相负荷不平衡的特点以及对线损的影响。论文在比较传统理论线损计算方法的基础上,选取等值电阻法作为低压台区理论线损计算的方法,但是考虑农网实际情况,等值电阻法对单一不平衡类型线损计算结果的精度不高,同时对出现两种或两种以上的不平衡类型无法计算的缺点,提出在等值电阻法的基础上,基于分时间段来计算三相负荷不平衡线损,通过两种计算方法结果的比较,验证了基于分时间段进行理论线损计算的可行性。最后,按照农网理论线损计算的要求,选用Microsoft SQL server 2008作为数据库,使用Java编程语言在Eclipse平台上开发了一套针对低压电网的理论线损计算软件,通过上述两种方法进行实例计算,验证了计算软件的实用性。
[Abstract]:Line loss rate is an important technical and economic index of electric power department, and its level is directly related to the technology and management level of electric power enterprise. Our country has the largest rural electric power network in the world, the user base of the rural network is huge, the coverage area is wide, and considering the complex characteristic of the agricultural network and the need to overcome many difficulties in the calculation process of the theoretical line loss, For example, the circuit structure parameter is not complete, the farm network equipment is old, the original data that needs to collect is too much. Based on the above factors, improving the accuracy and efficiency of line loss calculation of rural power network is an important subject worthy of further study. This paper is based on the project "calculation of theoretical Line loss in Public Transformer Station area", which is a cooperative project with Linxiang Electric Power Bureau of Hunan Province. The main content of this paper is the study on the influence of three-phase load imbalance on theoretical line loss. Firstly, the operation data of Linxiang electric power bureau are collected, and the line structure data of Linxiang district are recorded by surveying and mapping. Secondly, the type of three-phase load imbalance is divided from the drawn load curve, and the characteristics of three-phase load imbalance and its influence on line loss are analyzed. On the basis of comparing the traditional theoretical line loss calculation methods, the equivalent resistance method is selected as the theoretical line loss calculation method in the low voltage platform area, but the actual situation of the rural power network is considered. The accuracy of the equivalent resistance method for the line loss calculation of a single unbalanced type is not high. At the same time, for the defect that two or more kinds of unbalanced types can not be calculated, the equivalent resistance method is put forward based on the equivalent resistance method. By comparing the results of two calculation methods, the feasibility of theoretical line loss calculation based on sub-time period is verified. Finally, according to the requirements of theoretical line loss calculation of rural power network, Microsoft SQL server 2008 is selected as the database, and a set of theoretical line loss calculation software for low-voltage power network is developed on Eclipse platform with Java programming language. The practicability of the calculation software is verified.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM727.1
，
本文编号：2171238
[Abstract]:Line loss rate is an important technical and economic index of electric power department, and its level is directly related to the technology and management level of electric power enterprise. Our country has the largest rural electric power network in the world, the user base of the rural network is huge, the coverage area is wide, and considering the complex characteristic of the agricultural network and the need to overcome many difficulties in the calculation process of the theoretical line loss, For example, the circuit structure parameter is not complete, the farm network equipment is old, the original data that needs to collect is too much. Based on the above factors, improving the accuracy and efficiency of line loss calculation of rural power network is an important subject worthy of further study. This paper is based on the project "calculation of theoretical Line loss in Public Transformer Station area", which is a cooperative project with Linxiang Electric Power Bureau of Hunan Province. The main content of this paper is the study on the influence of three-phase load imbalance on theoretical line loss. Firstly, the operation data of Linxiang electric power bureau are collected, and the line structure data of Linxiang district are recorded by surveying and mapping. Secondly, the type of three-phase load imbalance is divided from the drawn load curve, and the characteristics of three-phase load imbalance and its influence on line loss are analyzed. On the basis of comparing the traditional theoretical line loss calculation methods, the equivalent resistance method is selected as the theoretical line loss calculation method in the low voltage platform area, but the actual situation of the rural power network is considered. The accuracy of the equivalent resistance method for the line loss calculation of a single unbalanced type is not high. At the same time, for the defect that two or more kinds of unbalanced types can not be calculated, the equivalent resistance method is put forward based on the equivalent resistance method. By comparing the results of two calculation methods, the feasibility of theoretical line loss calculation based on sub-time period is verified. Finally, according to the requirements of theoretical line loss calculation of rural power network, Microsoft SQL server 2008 is selected as the database, and a set of theoretical line loss calculation software for low-voltage power network is developed on Eclipse platform with Java programming language. The practicability of the calculation software is verified.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM727.1
，
本文编号：2171238
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