Micro grid control structures for better integration of renewable energy

Driven by the increasing need to expand grid capacities due to the sustained integration of distributed renewable energy sources (especially photovoltaic generation in low voltage grids), solutions for an economic justifiable approach are needed. The majority of the provided options by the OEMs lead to an increased amount of data and control complexity in order to operate the additional equipment. To avoid dependencies on a higher control instance and to reduce the needed effort to operate a distribution grid covering a large area, local control strategies could provide a solution. In a small village, the EnBW electricity company runs a pilot project and tests different options for low voltage (L V)-grid load shedding. To implement and validate control structures under real conditions is an inherent part of the research program. This paper shows the general approaches chosen for the design of a control system as a local micro grid, as well as the first results from the phase of practical testing.