Controlled islanding is a method that can significantly improve the handling of electric power system disturbance and reduce their effect on sensitive customers. It requires information at the system level of the system configuration and the steady state of the system. A CIM model of the system is required for the definition of the points of separation of an island from the rest of the system. Generation and load information needs to be continuously provided in order to determine the need for load or generation shedding to establish a balance following the islanding. When a wide area system disturbance is detected and a decision for some preventive actions are made, the controlled islanding system will make a decision to reduce loads and increase or reduce generation in an area of the system followed by commands to trip breakers of transmission lines in order to form an island isolated from the rest of the system with a load-generation balance.
This system can be applied at different levels of the system depending on the availability of power plants or distributed energy resources.
The controlled islanding system will also need to be modeled both in CIM and in IEC 61850 (no such model exists today).
This use case follows from the wide area protection definition through the analysis of the different possible modes of operation. The objective is to stress the 61850/CIM interface to discover aspects of the “seams” which exist between these two standards or to identify missing objects in both standards.
The CIM and 61850 must both be used at least at both ends of the process for this use case to be of practical use.