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For the transmission of electricity across long distances, high voltage direct current (DC) transmission is discussed in Germany as an alternative to the currently used alternating current (AC) as it is more efficient for these distances. Changes in energy infrastructure are known to raise public awareness. However, little is known whether differences in transmission technology are relevant for the...
Due to the increasing number of power-electronic components connected to the grid, medium-voltage dc (MVDC) grids are a promising alternative to established ac distribution grids. Within this work, the advantages and additional flexibility of substations for (urban) railways connected to future MVDC distribution grids are investigated. Possible topologies are presented and the efficiencies are compared.
Electrical energy distribution with dc grids reduces the investment costs of the system and increases the overall efficiency. For interconnecting different dc distribution grids as well as linkage to transmission networks and integration of renewable energy sources, the dual-active bridge (DAB) dc-dc converter system is a promising topology. Modularity and scalability improve production and reduce...
Future energy supply will be mainly ensured by renewable energy sources. Measures have to be taken to buffer imbalances in the grid caused by these volatile power sources. Battery energy storage systems (BESS) present a good solution for many applications. Besides efficiency and cost, reliability of these systems becomes increasingly important. Redundancy reduces the hazard of system failures. Highly...
Battery energy storage systems (BESS) become increasingly more important due to the impact of volatile energy sources on the power supply and present a good solution for buffering the power imbalances in the electric grid. Particularly with regard to a future scenario with electrical energy, means have to be taken to ensure a stable and reliable power supply. Redundant BESS allow normal operation,...
This paper describes the design of a digital control for PWM current source rectifiers (CSRs) in the range of 1 - 10MVA. A cascaded control structure is proposed: the inner loop controls the grid currents and the outer loop controls the dc-link current. The proposed grid-current control combines state feedback for active damping of the LC-filter with a servo compensator to increase robustness and...
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