Research On Access Control Method Based On Ontology In Smart Grid Information Integration

Smart grid as future development and reform direction of power system, has become the focus of attention all over the world. The integrated information sharing as one of the characteristics of the smart grid, it brings many advantages for the development of power system but also brings the security hidden danger to the operation and control of power system. How to ensure the information security access and exchange between application systems is an urgent problem in power grid integrated system. Access control technology as the one safety protection of core strategy, to guarantee the power system safe and stable operation has the important practical significance.This paper mainly includes three parts:First of all, Combined with security needs of smart grid information integration environment, and through the analysis of the advantages and disadvantages of the access control model, we designed an access control model that based on ontology and attribute, this model can solve the problem of access control interoperability in the semantic level. Secondly, to the two modules of attributes and strategy in the ABAC model did detailed study respectively. In the management of attributes, for the problems of attribute elements maintenance difficulty and heterogeneous attribute of multi-domain in ABAC model, we propose the method of using ontology to build and maintain the elements of access control. We designed the algorithm of calculation attribute semantic similarity in cross-domain access and realized the domain of mapping between attributes, which reduced the complexity of attribute management and raised the security of the cross-domain access. In the management of policies, because XACML technology that support of ABAC model itself lack of policy analysis mechanism, this paper design the algorithm of policy conflict detection and the process of redundancy analysis, which realized the process of policy analysis and processing in accordance with the XACML and improved the efficiency of the access control. Finally, in the smart grid information integration environment, we described the power system resources organization model CIM with OWL and gave the realization process of the main modules of access control.