Medium and low voltage control strategies for a smart distribution grid

The proceeding changes in the energy supply and consumption are challenging the distribution grids and the operators. Conventional grid enhancement or the use of smart grid solutions are possible approaches for encountering the future tasks. In this paper a comprehensive smart grid solution for medium- and low-voltage grids is analysed and possible control strategies are presented. In former cooperation, the authors developed a smart grid system for the low voltage level. Currently, there are several research activities for a medium voltage smart grid system, leading to an integrated approach by coupling these systems. In order to achieve a maximum of synergetic effects, both solutions have to be united in a structure, which is essential for the system's functionality as it represents a concept for an overall distribution grid automation. Autarkic, coordinated, hierarchic or agent-based control strategies are possible. The differences and advantages of chosen concepts to be implemented for field tests in near future are presented.