Distribution Network Line Loss Research Articles

A Fast Sensitivity Method for Determining Line Loss and Node Voltages in Active Distribution Network

A fast sensitivity method for determining line loss and node voltages in active distribution network is proposed. A quadratic sensitivity model of distributed generation (DG) output or load to Line Loss (QSLL) and a linear sensitivity model of DG output or load to node voltages (LSNV) are established based on one initial load flow calculation. Using these models, the variety of line loss and node voltages of distribution network can be directly determined with the variation of DG output or load demand. The proposed QSLL is more concise and accurate compared to the conventional linear sensitivity model. And the proposed LSNV are more concise than the conventional one.

Theoretical Line Loss of Distribution Network and Its Calculation Methods

配电网线损理论计算的研究是加强线损管理、节能降损重要技术手段。本文从配电网线损及线损率的定义、构成分类入手，对配电网线损产生原因、影响因素进行探讨；研究了配电网元件的数学模型，总结了配电网线损理论计算方法并进行比较和展望；以海南电网公司文昌地区典型线路为例进行了比较和分析。To study the theoretical calculation of distribution network line loss is an important technical method to enhance the management of line loss and the energy reduction. This paper started by analyzing the distribution network line loss and the definition and constituent of the line loss rate, then discussed the cause of the line loss and the influencing factors. The mathematical model of distribution network elements was studied, and the methods of calculating the line loss were con-cluded and compared. At last, the typical lines of Wenchang in Hainan Power Grid were taken for an example to be compared and analyzed.

Analysis on Losses of Distribution Network and Countermeasures to Reduce Losses

The thesis describes the loss model of distribution network and gives the transformer loss model and line loss model, Then it proposes some loss reduction measures at the stage of planning and design as well as operation and maintenance. Finally, according to the main problems about the loss reduction measures in China, it puts forward some countermeasures to reduce line loss . Distribution network as part of the end for power configuration which is directly connected with the users of demand side. The loss of distribution network has been high because of feeder radius, complex voltage grade and a large number of devices on the network. The line loss of distribution network represents a major component of the line loss in the whole power system, the line loss of 10kv and below distribution network accounts for about 78% in it according to statistical analysis[1-2]. So, under the current energy shortage situation, there is a great economic and social significance to adopt the reasonable measures to save energy and decrease loss in distribution network.

A Modified Optimization Model for the Location Selection of Distribution Transformer Used in Rural Power Network

The rural power networks play a very important role in the power network in China. The rural networks built in the old days are usually not standardized, and therefore, a lot of problems emerged these days. Such as, most of the transmission line is aged, the insulation ability of the transmission line degraded, the household voltage is relatively low, the distribution network line loss is very high, and so on. As the rural power network mainly distributes in the hilly and mountainous land, the altitude of the load points has an important impact to the location of distribution transformer. Meanwhile, because of the existence of the sag, the length of the transmission line is not a straight-line distance. Therefore, this paper modified the traditional optimization model used in the location of distribution transformer, introduced the line correction coefficient (α) which was connected with the sag, improved the line distance computational formula according to the altitude of the load points, and put forward the modified optimization model which is called M-TLOM. Then, an optimized location system of distribution transformer (DTLOS 1.0) based on the Visual Basic 6.0 was developed. The instance analysis indicated that, the modified model could reduce the loss of distribution network.