Information Model Building And Algorithm Research For Power System Alarm Processing Based On IEC61850

Substation automation and digital substation, which are solutions integrating modern information technology, have already been widely used. These factors powerfully push forward the daily operation management of the grid into informationization and automation. However, when the grid falls into malfunction, a lot of alarms will come up and surge into the dispatch center. Dispatchers are usually submerged in vast alarms. It is a great difficulty for dispatchers to make an analysis of a large number of alarms and diagnose the events occurring in the gird in a short period of time, so it is necessary to make a research on fast and effective alarm processing method. The alarm processing system can give a hand to dispatchers in respect to fast identifying the events occurring in the gird, so the dispatchers can take timely actions to maintain or recover safe and stabile operation of the grid.Research on the two sections of alarm processing, information model and algorithm, is made in this paper.Firstly, significance and background of the issue are summarized. The research status of the alarm processing problem is summarized from the aspect of algorithm research and the aspect of information model separately in this paper. The advantages, disadvantages and development trends of the various algorithms are summarized. Then, the characteristics of IEC61850are analyzed and an overview on modeling of primary structure and secondary structure of substation in IEC61850is presented. SCL language and the semantics mode of the SCL language in IEC61850are introduced. The functions and objectives of alarm processing system are presented. Information needs and various possible information sources of the alarm processing are analyzed. The total information flow of alarm processing system is presented.The action logic models and operation mode models of protection devices are established by using dynamic fault tree. Alarm processing model based on protection operation mode is built. Then, on the basis of the alarm processing model, based on the knowledge base of the alarm processing in view of protection operation modes, a method to generate the knowledge base through extended SCL model is designed.After that, Depending on analysis of the ability to describe of IEC61850SCL model, by inheriting from base class in SCL class system, contact line class is established. Based on contact line class, SCL models of the related substations are built and the SCL models are extended, obtaining standardized information model for alarm processing.Finally, examples based on a regional power grid in Guangdong are used to verify generation of extended SCL models and alarm processing Algorithm. The results show that the extended SCL model is able to provide complete and standardized information to alarm processing system, knowledge base based on the extended SCL model is valid and alarm processing algorithm based on protection action mode is proper and efficient.