Power System Monitoring Using Wireless Substation and System- Wide Communications Mobile Agent Part Mladen Kezunovic (P.I.) Xiangjun Xu Texas A&M University PS ERC PSerc Review Meeting College Station, March 22, 2002

PS ERC 2 Outline  Introduction  Part I - Summary report  Part II - Technical report  Conclusions

PS ERC 3 Part I-Summary report Introduction Background Current Activities Statement of Work Activity Schedule

PS ERC 4 Introduction Work since December 2001   Integrating with Circuit Breaker Monitoring Software   CLIPS Win32 DLL for embedded applications   Database systems for small scale applications   Applying Agent-Oriented Approach   Workflow management using software agents

PS ERC 5 Background System wide communications are aimed at power system monitoring and maintenance applications MERL’s Concordia mobile agent software has been applied to solve system wide communication problems Project was Initiated in September 2000 and will end in August 2002

PS ERC 6 Current Activities Integrating with the Circuit Breaker Monitoring (CBM) software Applying agent-oriented approach for enhancing the circuit breaker maintenance

PS ERC 7 Statement of Work Study of the mobile agent software and comparison with other distributed systems Study of the scenarios for application of the mobile agent software Agent-oriented approach applied in the maintenance process (new) Documenting the research results

PS ERC 8 Activity Schedule 1. Study of the mobile agent software and comparison with other distributed systems 2. Study of the scenarios for application of the mobile agent software 3. Agent-oriented approach applied in the maintenance process 4. Documenting the research results

PS ERC 9 Project Status A prototype system utilizing Concordia for CB monitoring applications has been built earlier Real utility data for field demonstration is missing Interfacing to the CB monitoring Expert System software (developed on a non-PSerc project) as well as the agent-oriented approach have been added as a substitute for the filed demo The project is on schedule

PS ERC 10 Publications M. Kezunovic, X. Xu, D. Wong "Agent- Oriented Approach to Work Order Management for Circuit Breaker Maintenance", submitted to IEEE PES Summer Meeting 2002 M. Kezunovic, X. Xu, D. Wong "Improving Circuit Breaker Maintenance Management Tasks by Applying Mobile Agent Software Technology", submitted to IEEE T&D Conference 2002, Asia Pacific

PS ERC 11 Part II- technical report Integrating Agent-based software with Circuit Breaker Monitoring (CBM) software Agent-Oriented approach

PS ERC 12 Integrating with CBM Software  CLIPS DLL for embedded applications Eliminated a separate expert shell Achieved better control over the expert system engine Database systems for small scale applications A good database system is important for both the developments and applications Compared Interbase 6, SQL Anywhere 7 and MySQL 3.23

PS ERC 13 Retrieving CBM Results

PS ERC 14 Agent-Oriented Approach Proactive software agents rather than just reactive Better assisting the maintenance crew Higher level abstraction and encapsulation Better software structure

PS ERC 15 Agent-Oriented Approach (cont’d) Agent sensors subscribing to events of interest Agent effectors callback functions Inference Engine Rule base External events Facts Callback functions Actions

PS ERC 16 Agent-Oriented Approach (Workflow management) Automatically driving the workflow to complete a work order The workflow is modeled by rules The agent will enter a “sleep” state if the conditions of the rule are not met By subscribing to events of interest, the agent “senses” the outside world and acts correspondingly

PS ERC 17 Conclusions A prototype system utilizing Concordia Mobile Agent Software for Circuit Breaker Maintenance (CBM) has been built. Interfacing between the real time CBM system and agent-based system for system- wide communications has been implemented Real application scenarios provided by utilities are still not available. Current focus has shifted to investigating the agent-oriented approach.