10kV配电网极限线损计算方法研究
发布时间：2019-05-23 14:50
【摘要】：配电网线损是电力系统运行经济性的一项重要指标，它反映了一个电力网的规划设计和运营管理水平由于配电网的负荷形状系数难以准确获知，，因此通过典型日的理论线损计算结果无法直接用于下达考核指标本文基于对平均电流法中形状系数的定义及物理意义，对10千伏配电网变压器和各分段线路的可变损耗进行极限计算，然后计及企业专线供电量，最终获得了10千伏配电网理论线损率的变化范围 在计算公用配电变压器极限可变损耗时，本文通过理论推导得出了变压器极限月负荷曲线，其中损耗极大值月负荷曲线是变压器在月供电量约束下负荷仅取月最大及最小负荷形成的矩形波样式负荷曲线；损耗极小值月负荷曲线是变压器的负荷以月平均负荷的水平线进行拟合，其中月最大负荷及最小负荷以冲击脉冲的形式出现 在计算馈线各分段线路上极限损耗时，本文按照月负荷曲线形状系数取极限值的思想，根据馈线拓扑从后往前依次对各分段线路上的极限负荷曲线叠加，最终通过平均电流法得到了各分段线路上的极限损耗另外，本文在考虑了馈线出口处月最大负荷约束条件下，提出一种实用的迭代方法求解线路上损耗的极大值该方法采用分时段拟合的方式得到了各时段馈线各变压器极限负荷的最佳组合，该组合下馈线公共线路上的损耗功率取极大值进而得到了计算月内各变压器月极限负荷曲线中最大及最小负荷的时间分布，然后从后往前推出各节点处的月极限负荷曲线，最终得到出口约束下各分段线路上月损耗的极大值 最后，本文以某区供电局10千伏配电网为例，对本文方法进行算例分析，验证了本文关于10千伏配电网理论线损计算方法的有效性和可行性 源于配电网拓扑复杂，计量自动化程度不高及数据海量等特点，供电企业在配电网线损管理中存在诸多问题，由于本文是对10千伏配电网变压器及分段线路逐个分析，因此可对线损异常的线路进行重点核查，挖掘管理过程中的薄弱环节和技术损耗中的降损空间另外本文计算结果可以作为上级部门了解地区配电网现状，下达考核指标及评估企业配电网线损管理水平的重要依据，进而迫使下级部门提高线损管理的质量
[Abstract]:The line loss of distribution network is an important index of power system operation economy, which reflects the planning, design and operation management level of a power network, which is difficult to know accurately because of the load shape coefficient of distribution network. Therefore, the theoretical line loss calculation results of typical days can not be directly used to issue the assessment index. This paper is based on the definition and physical meaning of the shape coefficient in the average current method. The limit calculation of variable loss of transformer and segmented line in 10 kV distribution network is carried out, and then the power supply of enterprise special line is taken into account. Finally, the variation range of theoretical line loss rate of 10 kV distribution network is obtained when calculating the limit variable loss of public distribution transformer. In this paper, the limit monthly load curve of transformer is obtained by theoretical derivation. The monthly load curve of maximum loss is a rectangular wave load curve formed by the maximum and minimum load of transformer under the constraint of monthly power supply. The monthly load curve of the minimum loss value is that the load of the transformer is fitted by the horizontal line of the monthly average load, in which the monthly maximum load and the minimum load appear in the form of impact pulse when the limit loss on each segment of the feeder line is calculated. In this paper, according to the idea of taking the limit value of the shape coefficient of the monthly load curve, according to the feeder topology, the limit load curve on each segmented line is superimposed from back to front, and finally the limit loss on each segmented line is obtained by the average current method. In this paper, taking into account the monthly maximum load constraint at the outlet of the feeder, In this paper, a practical iterative method is proposed to solve the maximum loss on the line. The optimal combination of the ultimate load of each transformer in each period of feeder is obtained by means of period fitting. In this paper, the loss power on the common line of the combined feeder is maximized, and the time distribution of the maximum and minimum load in the monthly limit load curve of each transformer in the month is obtained, and then the monthly limit load curve at each node is derived from the back forward. Finally, the maximum loss of each segmented line under export constraint is obtained last month. Finally, taking the 10 kV distribution network of a district power supply bureau as an example, an example is given to analyze the method in this paper. It is verified that the effectiveness and feasibility of the theoretical line loss calculation method for 10 kV distribution network in this paper is due to the complexity of distribution network topology, the low degree of measurement automation and the massive data. There are many problems in the line loss management of distribution network in power supply enterprises. because this paper analyzes the transformer and segmented line of 10 kV distribution network one by one, it can carry on the key verification to the line with abnormal line loss. In addition, the calculation results of this paper can be used as an important basis for the superior department to understand the present situation of the regional distribution network, issue the assessment index and evaluate the management level of the distribution network line loss in the enterprise. In turn, the lower departments are forced to improve the quality of line loss management.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744
本文编号：2483991
[Abstract]:The line loss of distribution network is an important index of power system operation economy, which reflects the planning, design and operation management level of a power network, which is difficult to know accurately because of the load shape coefficient of distribution network. Therefore, the theoretical line loss calculation results of typical days can not be directly used to issue the assessment index. This paper is based on the definition and physical meaning of the shape coefficient in the average current method. The limit calculation of variable loss of transformer and segmented line in 10 kV distribution network is carried out, and then the power supply of enterprise special line is taken into account. Finally, the variation range of theoretical line loss rate of 10 kV distribution network is obtained when calculating the limit variable loss of public distribution transformer. In this paper, the limit monthly load curve of transformer is obtained by theoretical derivation. The monthly load curve of maximum loss is a rectangular wave load curve formed by the maximum and minimum load of transformer under the constraint of monthly power supply. The monthly load curve of the minimum loss value is that the load of the transformer is fitted by the horizontal line of the monthly average load, in which the monthly maximum load and the minimum load appear in the form of impact pulse when the limit loss on each segment of the feeder line is calculated. In this paper, according to the idea of taking the limit value of the shape coefficient of the monthly load curve, according to the feeder topology, the limit load curve on each segmented line is superimposed from back to front, and finally the limit loss on each segmented line is obtained by the average current method. In this paper, taking into account the monthly maximum load constraint at the outlet of the feeder, In this paper, a practical iterative method is proposed to solve the maximum loss on the line. The optimal combination of the ultimate load of each transformer in each period of feeder is obtained by means of period fitting. In this paper, the loss power on the common line of the combined feeder is maximized, and the time distribution of the maximum and minimum load in the monthly limit load curve of each transformer in the month is obtained, and then the monthly limit load curve at each node is derived from the back forward. Finally, the maximum loss of each segmented line under export constraint is obtained last month. Finally, taking the 10 kV distribution network of a district power supply bureau as an example, an example is given to analyze the method in this paper. It is verified that the effectiveness and feasibility of the theoretical line loss calculation method for 10 kV distribution network in this paper is due to the complexity of distribution network topology, the low degree of measurement automation and the massive data. There are many problems in the line loss management of distribution network in power supply enterprises. because this paper analyzes the transformer and segmented line of 10 kV distribution network one by one, it can carry on the key verification to the line with abnormal line loss. In addition, the calculation results of this paper can be used as an important basis for the superior department to understand the present situation of the regional distribution network, issue the assessment index and evaluate the management level of the distribution network line loss in the enterprise. In turn, the lower departments are forced to improve the quality of line loss management.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744
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