SCD Two-Layer Vectorization and Change Verification Technology Based on Hash and Edit Distance Algorithm

doi:10.11930/j.issn.1004-9649.202308062

Abstract

Abstract:

In view of the sharp increase in operation and maintenance workloads caused by changes in substation configuration description (SCD) file and unclear configuration of secondary equipment in intelligent substations, a two-layer vectorization and change verification technology based on hash and edit distance algorithm for SCD is proposed. Firstly, considering the initiation and verification of file changes, a two-layer vector model for SCD file parsing is constructed using node elements, verification codes and element attributes. Secondly, the hash algorithm is used to transform the constructed text vector model into a hash string vector model. Then, the edit distance algorithm is introduced to calculate the two-layer vector model similarity between the original file and the changed file. Based on the comparison of the first layer similarities, the second layer verification initiation criterion is formed, and the change verification is achieved based on the second layer similarity in combination with the backtracking path method. Finally, the effectiveness of the proposed algorithm was verified through numerical analysis.

Key words: intelligent substation, SCD file verification, vector model, hash algorithm, edit distance, similarity calculation

Yuanbo YE, Jiwen WANG, Wei WANG, Yurong MAO, Zhihua WANG. SCD Two-Layer Vectorization and Change Verification Technology Based on Hash and Edit Distance Algorithm[J]. Electric Power, 2024, 57(1): 255-262.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202308062

https://www.electricpower.com.cn/EN/Y2024/V57/I1/255

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References 25

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变更方式	装置	具体变化	修改结果	变更前SCD	变更后SCD
	CG5002	通信方式变化	关键元素参数或条目数变化	GSE条目数：6	GSE条目数：0
修改	CM5001	虚端子变化	CRC校验码变化	CRC校验码：val=DA3775D4	CRC校验码：val=B05C705A
	CG02	间隔变化	IED设备名称变化	公用测控2	公用测控3
增加	CB5031	设备增加	IED新增设备		CRC校验码：val= 0XLA58E449
删减	PZ3501	设备删减	IED停用设备	CRC校验码：val= 0XC4FADE55

变更方式	装置	具体变化	修改结果	变更前SCD	变更后SCD
	CG5002	通信方式变化	关键元素参数或条目数变化	GSE条目数：6	GSE条目数：0
修改	CM5001	虚端子变化	CRC校验码变化	CRC校验码：val=DA3775D4	CRC校验码：val=B05C705A
	CG02	间隔变化	IED设备名称变化	公用测控2	公用测控3
增加	CB5031	设备增加	IED新增设备		CRC校验码：val= 0XLA58E449
删减	PZ3501	设备删减	IED停用设备	CRC校验码：val= 0XC4FADE55

相似度	情况判断	操作处理
S=1	完全相同	无须启动
0≤S＜0.78	不会出现	无须启动
0.78≤S＜1	部分不同	启动

相似度	情况判断	操作处理
S=1	完全相同	无须启动
0≤S＜0.78	不会出现	无须启动
0.78≤S＜1	部分不同	启动

SCD	向量	n₁	n₂	n₃	n₄
变更前	$ {{\boldsymbol{f}}_3} $	50	116	206	788
变更后	$ {\boldsymbol{f'}_3} $	50	120	218	846