The high share and still increasing amount of distributed generation, predominantly wind and photovoltaic, set new challenges to the DSOs in Germany. In order to provide hosting capacity to integrate these resources, huge investments in grid infrastructure are required. Moreover, grid operation and grid observation become more complex since power flows are becoming less predictable. At the start of the project, in Germany, there were hardly any surveillance facilities or grid automation in place in medium voltage networks. The German GRID4EU Demonstrator addressed these challenges with the demonstrator built up in the area of “Reken”, located in North Rhine-Westphalia. The considered grid was well-selected: from the beginning of the project on, it showed a balance between installed generation power and maximum demand. Further increase in renewables to be connected was forecast. The grid focused on consists of 85 secondary substations.
Dedicated spotlights on technical results of the GRID4EU Demo 1 are available via the following downloadable articles:
The basic idea is to implement an Autonomous Switching System (ASS) that is based on an autonomous interaction between decentrally installed modules in selected secondary substations and a lean control centre in the primary substation. All decentralised modules provide measured values and, furthermore, some of them are equipped with remote controlled switching gears. The central module collects all needed data and generates switching programs derived from the current state of the grid. The possibility of autonomous switching provides dynamic topology reconfiguration which is a new concept of operation.
The following objectives are targeted: