Research On Heterogeneous Information Model Mapping And Plug And Play Mechanism Of Distribution Network

With the development of informatization level of power supply enterprises and the increase of distributed power application system demands,it has become a crucial basis for the development of smart distribution network to eliminate "information islands" and realize information integration among heterogeneous systems.The IEC61968/61970 and IEC61850 standards issued by International Electrotechnical Commission are the core standards in the field of distribution network information integration.The standards are used to regulate the semantics and syntax of information models for power distribution management system and power enterprise automation system respectively.To realize the information integration of distribution network,IEC61968/61970 and IEC61850 standards need to be applied comprehensively.However,the difference of different standards and private expansion lead to model heterogeneity,which hinders the realization of information integration.There exists no mature solution yet.Based on IEC61968/61970 and IEC61850 standards,this paper not only analyzes the difference of information model and the fusion modeling method,but also designs the model mapping and data conversion module.What is more,the architecture of plug-and-play information flow of distribution network equipment is proposed.The first step is the difference analysis and fusion modeling method of information models.This paper analyzes the heterogeneity of Common Information Model caused by version update of IEC61970/IEC61968 standard,as well as the data interaction difficulty caused by private expansion by power enterprises.Also,the difference between IEC61850 standard information model and CIM model in model structure,interface service,communication protocol and other aspects are explained.Based on the analysis of model difference,extended modeling is conducted from topology and measurement aspects,so as to eliminate most of the differences in terms of grammar definition,modeling scope and model structure.The second step is the study of heterogeneous information model mapping and data conversion method,which is the focus of this paper.Different information model will result in data conflicts during information exchange process,further hinder the normal integration of information.In order to realize the mapping between heterogeneous models,this paper designs a node mapping algorithm based on ontology language and ontology topological storage.Through comparing node language and structural similarity and eliminating redundancy,the algorithm exports the mapping results.A comprehensive evaluation indicator is proposed to examine the comprehensiveness and accuracy of the mapping scheme.Based on that,the XSLT transformation script is generated and then the data transformation scheme of heterogeneous model is proposed.In addition,consistency test rules and its framework is developed.To verify the reliability of the heterogeneous information model mapping and data conversion algorithms,CIM transformer models of different versions and IEC61850,IEC61968 topology models are chosen as instances to perform model mapping,data conversion and consistency test.Last but not least,plug-and-play information flow mechanism for distribution network equipment is proposed.Heterogeneous information model mapping and data transformation technology helps to achieve standardized information integration and lay a foundation for the active control and management of distributed energy.The battery energy storage system is selected as the representative object.Through analyzing the operating states,control strategies and functional requirements of several typical scenarios,the logical nodes with specific functions are selected to construct logical devices.On that basis,self-described configuration is deployed.After that,this paper analyzes the discovery/registration mechanism of BESS grid connection and the mapping method between IEC61850 communication model and IEC60870-5-104 protocol.Using selfdescribing model as the basis,the heterogeneous information model mapping and data conversion module as the core,the IEC61850 communication model and protocol mapping as the guarantee,a plug-andplay information flow architecture for battery energy storage system is constructed.The research result can provide model mapping and data conversion service for the information exchange among application systems in distribution network.Also,it will be benefitial to improve the efficiency and convenience of distributed energy grid-connected operation and improve the information integration level of distribution network.In a word,the result is suitable for real-time application.