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Based on the standard IEC 61850 Digital Substation Communication Technology

Author: ZhangDaTao
Tutor: WangKui
School: Shandong University
Course: Electrical Engineering
Keywords: interoperability DOM IEC61850 OPC Object Oriented Modeling
CLC: TM769
Type: Master's thesis
Year: 2009
Downloads: 526
Quote: 10
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Abstract


The IEC61850 is the newest international standard on the substation automation. It is the highest mothed in the substation automation systems. The worldwide electrical corporations are paying attentions to IEC61850. The features are: it designs an abstract model and describes how devices are to communicate in a substation. Consequently the IEC61850 standard can only be operational when maped to a specific concrete application layer procotol such as the Manufacturing Message Specification(MMS).The background and main idea of the standard are introduced in this paper. The main technical features of network leveling, unified object-oriented modeling, dataobject self-description abstraction of communication service mapping, adopting of XML language etc. are analyzed in detail. The realization of IEC61850 is given summarily from the four aspact: function modeling, data modeling, communication service mapping, substation automation engineering and conformance testing. The definitions given by IEC 61850 on logical nodes (LNs), PICOM, event time, transfer time, types and performance classes of message are expounded. The requirement of the performance of messages for substation automation systems, the standard IED synchronization and the indices of related values of power system are put forward.The realization of server database based on IEC61850 standard is analyzed, and a solution compatible with the existing database is proposed in this paper: the original database and applications are kept unchanged, and implementation of the IEC61850 shall be treated as one of the configurable tasks in the system, where IEC61850 database will be dynamically generated as per the CID file and achieve communications with the client. A configuration file is created by the IEC61850 configuration tool to realize mapping of the related data between the original database and the IEC61850 database, and then both database will be bidirectionally refreshed in accordance with the mapping file. Three options of interfaces with legacy IEDs are recommended and compared in this paper. Four aspects, SCADA application in the substation, time critical information exchange, connection of the process level, auto configration, are discussed and relevant solutions are given.The paper discusses how to apply XML technology to create, parse and validate a SCL file in the development of system configuration tool for IEC-61850. It introduces DOM, the key technology of development. And the paper discusses four applications in System Configurator for IEC-61850.The implementation of the server and configration tools is presented in this paper. The implementation assures stability of the system and excellent expandability. Field running has proved that this method is totally feasible. This method can be referred to in developing new products based on the IEC61850 standard, and implementing IEC61850 in existing products.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Computer application in power system
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