Distributed real-time computer network architecture-power systems information model coordinated with agent applications

The authors have defined information models for power systems and devices based on object oriented technology, and designed Global and Local information models. The Global information model is used for EMS/SCADA and power systems operation in the control center, and the Local information model represents the behavior of components and devices in the power station and/or substation. Similar information models are being developed by IEC-TC57 as IEC61970 and IEC61850, and by EPRI as CCAPI and UCA2.0, aiming for standardization of open and multi-vendor systems integrated by cooperating EMS/SCADA systems, or equipment and devices. The information models are based on those of IEC and EPRI, and they are expanded for distributed processing in network environments. The authors implemented IEC61970 as the Global information model and IEC61850 as the Local information model with Java Class library. Also, the authors developed a prototype system that consists of a personal computer (PC) as control center, and 2 PCs as substations, and a network computing terminal with current and voltage sensors as another substation. The authors implemented agent applications for simple SCADA and simulation of the power systems devices (ex. Power Transformer, Circuit Breaker) to evaluate the cooperation between agent applications and the information model, and proved the usefulness of the information model. The authors examined the functional expansions for distributed environments, and clarified their ease of implementation and effectiveness.