Segment Identification of Topology Changes in Medium Voltage Distribution Network Based on Electrical Characteristics Analysis

doi:10.11985/2023.04.024

Abstract

Abstract:

In order to solve the problem of topology identification in distribution networks with insufficient measurement data and large number of distributed power sources, a segmentation identification method of topology structure based on electrical characteristic analysis is proposed to improve the accuracy of topology structure identification. Firstly, the concept of “super node” is introduced into the distribution network, and the scope of topology change is determined by analyzing the change of node injected power after topology change. Through the analysis of the power transmission characteristics and voltage amplitude characteristics of the distribution network when the distributed generation is connected, the segmented lines are identified by double verification and supplementary identification, and the final line is corrected by secondary identification. Finally, the loop iteration method is used to identify the connection relationship of the segment line. Simulation results show that the proposed method can improve the accuracy of topology identification and has good robustness within the allowable error range of the measurement device.

Key words: Distribution network, topology identification, electrical characteristics, super node, segment identification

CLC Number:

TM711

YANG Shuhang, LI Shiwei, WU Hongbin, JIANG Sicheng, WEI Yingjie. Segment Identification of Topology Changes in Medium Voltage Distribution Network Based on Electrical Characteristics Analysis[J]. Journal of Electrical Engineering, 2023, 18(4): 217-227.

Figures/Tables 23

References 23

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分段线路编号	无DG接入	DG接入
①	5	5
②	6-7	6
③	8-13	7
④	25-29	8-15
⑤	30-14-15-16-31-17-32	25-29
⑥		30-16-17-31
⑦		32

分段线路编号	无DG接入	DG接入
⑤	14-17-32	16-17-32
⑥	30-31	30-31

分段线路编号	无DG接入	DG接入
①	5	5
②	6-7	6
③	8-13	7
④	25-29	8-15
⑤	14-17-32	25-29
⑥	30-31	16-17-32
⑦		30-31

配置	本文方法	回路功率法	电压偏差方差法
断开支路	28-29	29-30	5-6、11-12、28-29
投入联络线	17-32	17-32	17-32

辨识方法	辨识准确率(%)
辨识方法	无DG接入时	DG接入时
本文方法	99.78	99.69
回路功率法	99.74	95.66
电压偏差方差法	94.53	92.72