基于改进相关性分析的低压台区拓扑辨别方法

Topology Identification Method for Low-voltage Distribution Area Based on Improved Correlation Analysis

低压线路拓扑的准确性不仅会直接影响整个配电系统运行监控与安全检测,还会影响系统的故障诊断、安全分析和其他相关工作的开展。文中针对配电台区设备的组网特点,提出了一种基于改进相关性分析的低压台区拓扑辨别方法。首先根据低压配电线路的长度应满足末端电压质量的要求,选择合适范围内的台区设备作为研究对象;其次根据台区同馈线设备电压之间的相似性,利用DBSCAN聚类算法,将设备归类到不同的出线区域,并筛选出不属于该台区的设备,缩小研究范围;再其次基于能量守恒定律,上游设备流出的能量等于下游设备流入能量之和的特点,结合功率曲线的相关性和残差平方和,找到上游设备的最优下游设备组合,识别各出线区域设备的上下游连通关系;最后对各出线区域设备连通性进行校验,解决其中冲突节点,最终建立全网台区拓扑结构。

The accuracy of low-voltage line topology will not only directly affect the operation monitoring and safe detection of the entire power distribution system,but also affect the development of system fault diagnosis,safety analysis and other related works.Focusing on the characteristics of equipment networking in the distribution station area,a kind of low-voltage distribution area topology identification method based on improved correlation analysis is proposed in this paper.Firstly,according to the requirement that the length of the low-voltage power distribution line shall meet the quality of the terminal voltage,equipment which is in the appropriate range of the distribution area is selected as the research object.Secondly,according to similarity between voltages of the same feeder equipment of the distribution area and by the use of DBSCAN clustering algorithm,the equipment is classified into different areas and the equipment not belonging to this area is screened out so to narrow the research scope.Thirdly,based on the law of conservation of energy and the characteristic that the energy flowing out of the upstream equipment is equal to the sum of the energy flowing into the downstream equipment as well as in combination with the correlation of power curves and the sum of square discrimination,the optimal downstream equipment combination for the upstream equipment is found and the upstream and downstream connectivity of the equipment in each outgoing line region is identified.Finally,the connectivity of equipment in each line region is calibrated so to solve the conflicting nodes and finally set up the topology of the distribution area of the whole network.