Study of CIM Modeling for a PV Grid-Connected System

Abstract

To conduct the research on voltage stability online-monitoring simulation system in the photovoltaic (PV) power gird-connected system, a classic 3-bus power system containing a PV power station with a flexible setting capacity (including distributed PV, relatively large-scale and large-scale PV, and super large-scale PV base, etc.) is taken as the test example. According to the IEC 61970 Standard Part 301 (Common Information Model, CIM), CIM modeling method for the PV grid-connected 3-bus system is studied by using the Rational Rose software and the unified modeling language UML, and the PV grid-connected system’s network connection model, each load model, measurement model and topological model are established; meanwhile, the PV power is treated as a load model to simplify the modeling process. On the basis of the established CIM model of the PV grid-connected system, the method of mapping the common information model to the relational database is studied and an applied mapping diagram is set up. Then the database technology is used to deposit the established CIM model into the created database for the use of Energy Manage System (EMS) and each utility software such as the voltage stability online-monitoring software in the PV grid-connected system. Then, the database is technically connected to the voltage stability online-monitoring software of the PV grid-connected system, and the communication between the station terminal and the monitoring terminal can be realized.