The Research Of Construction And Security In The Information System Of Digital Substation

The implementation of Digital Substation Automation System(DSAS)will greatly reduce the difficulty and cost of information sharing,and will also allow interoperability between Intelligent Electronic Devices(IED).These advantages will be helpful to achieve high-performance and low-cost automation system.However,using unified communication standard is the precondition of realization of these advantages.IEC 61850 is the international standards about the network communication system in substations,and its benefits have been proved partly.Furthermore,it has been adopted as an industry standard by many countries including China.As a result,building the information system of DSAS based on IEC 61850 is the best choice.First of all,IEC 61850 is not only a communication standard,but also explain the structure and principle of DSAS,so many aspects of building DSAS information system should be related with the intension of IEC 61850.In the paper,IEC 61850 is analyzed from the viewpoint of interoperability objective of it,and its work principle is illustrated.Based on it,the methods of building DSAS information system which can adequately embody interoperability advantage of IEC 61850 is discussed.Data structures are usually used to implement information models in bay level IED or process level IED.From the interoperability point of view,I propose a logical structure which can reflect information model veritably.A storage structure based on binary tree is also proposed.The basic redundancy methods including ring topology,hybrid topology,and fully redundant with double network adapters are discussed too.Transitional scheme of DSAS has to be taken into account since popularization of DSAS will be a long-term course.Secondly,according to the digital substation process bus information sharing practical problem,is suitable for digital substation data acquisition unit,merging unit design.Finally,a simulation platform for DSAS networks is built with OPNET Modeler.Models for all typical IEC61850 compatible IEDs are built,and the simulation platform is built based on them.The above several typical DSAS designs are simulated on the platform,and the results have guiding significance.