Future grid protection concepts in digitized substations
Conventional power plant capacity is increasingly being replaced by the widespread use of decentralized units with volatile generation characteristics. At present, regular switching operations are necessary in order to prevent grid overloads. Conventional protection system design often accounts for a select few switching states, this can complicate the reliable differentiation between fault and normal operation and in turn jeopardize the reliability of the protection system. Accordingly, the development towards adaptive grid protection systems is essential in order to continue to maintain the effectiveness of protection technology.
Digitized substations form the basis of future grid protection concepts by utilizing various communication services. These range from the transmission of measured variables in the power system by means of »Sampled Values« and the exchange of status information between devices using GOOSE messages ,to the transmission of signals to the SCADA system through client/server communication. The resulting requirements with respect to availability and security are met by new monitoring concepts such as intrusion detection systems.
The Grid Protection Laboratory enables the evaluation of adaptive network protection concepts. For further testing with regard to fault tolerance, transmission and processing of the adaptive protection data, we support active demonstrators encompassing various elements of the process chain (adaptive protection algorithms - communication link - protection device demonstrator). Future challenges of digital substations are thus addressed with regard to compatibility, reliability and IT security.