基于多源数据融合的配电网故障诊断技术

doi:10.16183/j.cnki.jsjtu.2022.317

摘要/Abstract

摘要：

如何充分利用已有信息提高配电网故障诊断准确性,为配电网抢修提供精准研判是亟待解决的问题.针对已有配电网故障诊断信息来源单一的问题,提出融合配电网中、低压信息与变电站出线电流信息的配电网故障研判模型.该模型首先针对已有过电流诊断方法难以适用于大规模配电网的问题,分层缩减配电网求解规模,提高故障区段定位速率;然后针对过电流告警信息准确性问题,提出基于开关继电保护事件顺序记录(SOE)数据和变电站出线负荷骤降数据的配电网故障辅助研判手段;最后,总结实际工程中多方位信息数据融合配电网故障研判步骤,为调度人员故障诊断提供借鉴.工程实践证明:所提方法能有效进行故障诊断,对于大规模配电网适应性极强;结合开关动作SOE和遥测电压信息的辅助诊断模型,能满足过电流诊断模型对遥信信息准确性要求高的特点,两者互补性较高,工程实践中具有较好的故障诊断效果.

关键词: 大规模配电网, 多源数据, 故障研判, 遥测, 继电保护

Abstract:

How to make full use of existing information to improve the accuracy of fault diagnosis in distribution networks, and provide accurate research and judgement for emergency repair of distribution networks, is an urgent problem to be solved. To address the problem of the single source of fault diagnosis information in existing distribution networks, a fault diagnosis model of distribution network is proposed which integrates the medium and low voltage information of the distribution networks and the outgoing current information of the substation. The model first applies the existing overcurrent diagnosis method to the problem of large-scale distribution network, and adopts hierarchical reduction of the size of the distribution networks to improve the location speed of fault section. Then, in view of the accuracy of overcurrent alarm information, an auxiliary fault judgment method for distribution networks based on switch relay protection sequence of events (SOE) data and substation outgoing load sag data is proposed. Finally, the steps for fault diagnosis in distribution networks of multi-directional information and data fusion in practical engineering are summarized, which provides reference for fault diagnosis of dispatchers. Engineering practice proves that the method proposed in this paper can effectively diagnose faults and is very adaptable to large-scale distribution networks. The auxiliary diagnosis model combining switch operation SOE and telemetering voltage information can compensate for the accuracy requirements of the overcurrent diagnosis model for remote communication information, which is complementary to each other and has a good engineering value.

Key words: large scale distribution network, multi source data, fault diagnosis, telemetry, relay protection

中图分类号:

TM745

张春梅, 许兴雀, 刘思麟. 基于多源数据融合的配电网故障诊断技术[J]. 上海交通大学学报, 2024, 58(5): 739-746.

ZHANG Chunmei, XU Xingque, LIU Silin. Distribution Network Fault Diagnosis Technology Based on Multi-Source Data Fusion[J]. Journal of Shanghai Jiao Tong University, 2024, 58(5): 739-746.

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保护动作情况	故障位置
上级II、III段,本级I、II、III段	本级线路上级II段后备保护范围内
上级III段,本级I、II、III段	本级线路上级II段后备保护范围外,本级I段范围内
上级III段,本级II、III段	本级线路I段保护范围外

算法	单点故障		多点故障
算法	时间/s	准确率/%	时间/s	准确率/%
本文方法	3.67	100	4.07	100
膜算法	27.84	87.32	30.92	77.62
和声算法	78.8	71.2	82.2	68.21

开关编号	实际负荷/kW	占比/%
SB1	85.51	10.19
SB2	28.98	3.56
SB3	25.23	3.02
SB4	1.02	0.12
CB2	486.77	60.42
SB5	120.84	15.08
CB3	221.62	27.40