59 partners cooperate in the southern German smart grid project C/sells, including research institutions, distribution system operators (DSOs), municipal utilities, generators, service providers and consultants in the energy and IT sector – and the two TSCNET shareholders TransnetBW, the south-west German transmission system operator (TSO), and TenneT, the Dutch-German TSO. The aim of C/sells is to make the energy infrastructure renewable, decentralised, flexible, and participatory. The focus here is on the intelligent networking of generation and consumption and the use of innovative grid technologies and operating concepts. The “cell” is the basic unit of C/sells. It can be of a geographical nature, such as a city or district, or it can be a single object, such as an airport or even a single property. These “cells” assume a variety of functions and tasks that serve to stabilise the grid and provide flexibility. C/sells is funded by the German Federal Ministry for Economic Affairs and Energy in the framework of the innovation programme “Smart Energy Showcases” (“Schaufenster intelligente Energie” – SINTEG).
TransnetBW now reports a significant progress for C/sells, because together with the municipal utility of Schwäbisch Hall in the in the German state of Baden-Württemberg and the DSO Netze BW, the partially automated cascade process of C/sells was demonstrated live. A cascade process is usually understood as any process that takes place in a series of steps, and in this case, it is the step-by-step control of plants from downstream networks to remedy critical grid situations in an emergency. In the demonstration of 21 October, a simulated threat to system balancing was resolved by means of the partially automated cascade process and an intelligent measurement system. In the process, facilities were controlled right down to the lowest voltage level. The selected scenario was a realistic situation and required the cooperation of all grid operators.
The demonstration was based on the coordinated power grid cascade developed in C/sells which defines clear rules and processes for the respective grid operators. By means of control centre coupling, information on the state of the grid is continuously exchanged across all voltage levels. Several defined signal phases visualise the grid status in the control centres involved and indicate the measures to be derived from it. Thanks to the communication technology coupling of TransnetBW and Netze BW and the bidirectional exchange of information in real time, emergency situations can now be mastered jointly across voltage levels within just a few minutes. Dr. Rainer Enzenhöfer of TransnetBW and sub-project manager of C/sells comments on the successful demonstration: “With the partial automation of the cascade, it is possible, together with DSOs, to control a large number of decentralised plants in a simple and uncomplicated manner within a very short time in order to eliminate a critical grid situation.”