Research

Electric Power and Energy Systems – Renewable Energy

The research topics related to electric power systems are mainly related to the integration of renewable energy sources into both transmission and distribution systems. In transmission systems the provision of ancillary services by (e.g.) wind turbine parks is investigated, e.g. the contribution to primary frequency control and inertial response. With respect to distribution systems, a lot of attention has been paid to power quality and in recent years pioneer research on microgrids has been carried out.
While we started with short-term control aspects (e.g. primary frequency control), we also investigate control and energy management over longer time frames, e.g. unit commitment problems in microgrids, including storage and, thus, links with thermal networks. This also includes economic and environmental aspects and concrete applications, e.g. the optimisation of the energy system of business clusters.
One of the challenges of integrating renewable energy sources in power grids is their intermittent character which can be compensated by (e.g.) demand-side response, i.e. by the flexibility of electric power consumption.

With respect to the electric power generation based on renewable energy, some niche technologies and aspects are investigated, e.g. small and medium wind turbines (SMWTs) and wave energy converters (WECs). In both cases we focus on maximum power extraction from wind and waves resp. by advanced control techniques and maximum power point tracking algorithms. In particular the dynamic aspects are treated, e.g. due to the fastly varying wind speeds for SMWTs and irregular waves for WECs.