| Abstract |
DC grids are considered to be a key technology for the connection, collection and integration ofrenewable energy resources, for the realization of integrated power systems, for mobile applications(electric ships, aircrafts), for new types of urban and industrial distribution power networks and tobridge and support existing AC systems. Advanced power electronic components, power convertersand system protection are enabling DC grids on multiple voltages levels. Especially medium voltageDC grids are expected to play a key role in managing the higher power flows in our future distributiongrids. Roadmap for DC and different steps and research at the TUD is presented with focus on DCgrids and DC microgrids. Problem of Power Flow control in DC grids is addressed first an Power flowcontroller introduced. A zonal protection framework where the low voltage dc grid is partitionedaccording to short-circuit potential and provided degree of protection, and several known protectionschemes that ensure selectivity, sensitivity and security will be discussed. |
