Research On Information Integration For Substation Equipment Based On Multi-Agent Technology

With the rapid development of substation automation technology, large quantity of equipment and information from different application system in substations have increasingly become people's focus point. Currently, due to the lack of feasible standard, substation equipment condition monitoring systems are implemented by different providers according to their own comprehension to some particular equipment functions. It leads to great difficulty for substation equipment condition monitoring systems in sharing valuable information with other application systems, these problems also include difficulties in information sharing among intelligent electronic devices(IEDs) or application software by different vendors, without interoperability and interchangeability each other, and poor reliability and observability of condition monitoring IEDs themselves. It has become a big challenge to maintenance of substation equipment for power enterprise.In this dissertation, agent theory and methodology including agent platform structure, coordination mode and communication model of multi-agent technology are studied sequently as well as IEC 61850 and IEC 61970 series international standard. And then they are respectively applied in substation information integration platform, condition monitoring system for primary equipment and remote maintenance system for secondary equipment and united model based on efforts to harmonize IEC 61850 and IEC 61970 for both primary and secondary equipment. A substation equipment condition monitoring information platform (CMIP), which characterized equipment unified extended common information model (ECIM) and unified communication interfaces including component interface specification(CIS) and IEC 61850 abstract communication service interface (ACSI), is designed and implemented. By this platform, comprehensive condition information of both primary equipment and secondary equipment can be monitored timely, and also dispersive condition monitoring information can be integrated and exchanged with the other application systems conveniently. It will be significant to improve the efficiency and certainty of substation equipment condition assessment, and to ensure healthy and steady operation of power grid. The research work in this dissertation is organized as the following 6 parts.â… . The issues to be studied are presented firstly, and the background is introduced as well. The state of arts of IEC 61850 and IEC 61970 are analysed. And then, multi-source information fusion, multi-agent and application on power system and problems should be solved are analysed in succession.â…¡. An Embedded Platform for Substation Data Integration (EPSDI) and a compatible interface scheme for both legacy IEDs and standard IEDs based on IEC 61850 is proposed. The software architecture based on multi-agent systems is designed elaborately. And the balance between the stability and the performance can be achieved through the agile distribution configuration and publish/subscribe mechanism among agents. The method can bring a new feasible approach to propelling substation smooth digitalization based on IEC 61850, due to its good application and expandability.â…¢. After analysis and conclusion of condition monitoring technology development, an architecture of layered condition monitoring information platform for high voltage equipment in substation based on agent federation coordination mechanism is proposed. Some issues including agent federation structure, coordination mode, and implementation method are studied in particular. With this solution, all the dispersive condition monitoring information can be integrated, shared and exchanged conveniently.â…£. A communication model for distributed and isomerous agent platform is presented based on multi-agent systems and XML interaction. A remote maintenance system for substation secondary equipment based on XMLHTTP and coordination multi-agent and web services technology is designed and implemented. It presents a new method to maintenance system for substation intelligent equipment with the background of digitalized substation and smart grid.â…¤. An information architecture of condition monitoring substation equipment system is proposed based on IEC 61850 and IEC 61970 coordination firstly. And then problems of model construction, extension and mapping of substation equipment information are researched by efforts to harmonize IEC 61850 and IEC 61970. Condition monitoring information platform for substation equipment, which is characterized by its unified information model and standard communication interfaces, is designed and implemented as well. By this platform, comprehensive condition information of both primary equipment and secondary equipment can be monitored timely, and also dispersive condition monitoring information can be integrated and shared with the other application systems conveniently.â…¥. An application project in one 500kV substation of East China is introduced as the comprehensive verification of the main of research achievements mentioned above. One information integration platform for substation equipment based on coordination of IEC 61850 and IEC 61970 was implemented in the project. Some implement details are introduced sequently, which includes deployment of information integration platform, method of IEC 61850 modelling and extension for equipment condition, implement of communication interfaces architecture, and design of application UI.