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Large renewable energy sources are usually connected to a single transmission system. In the future, groups of renewable energy sources (RES) could link several asynchronous power systems through HVDC systems. This study implements a Master Control for a HVDC system to utilize the RES-grid between two asynchronous power systems to the maximum amount. Master Control of the HVDC system is based on an...
Modular Multilevel Converters (MMC) are a common VSC topology for high power applications like HVDC. Different modulation techniques are being used with this converter topology. Low excitation of harmonics is considered an important advantage of multilevel VSCs, but the generation of a high frequency spectrum above 2 kHz due to the high number of switching devices has not yet been sufficiently investigated...
The increasing share of distributed generation poses risks to the selectivity and reliability of power system protection. To begin with, this paper presents a selection of currently faced challenges, which lead to errors in locating of faults and secure functionality. As a result of the theoretical analyses, adaptive settings based on the current state of the protected electrical system are deducted...
HVDC technology is a promising option to cope with regional power imbalances introduced by the increased generation from renewable energies. In particular, dc grids can be a technically and economically feasible solution for offshore and overlay applications. For dc grids, a concept for active power balancing has to be developed. This is usually done using piece-wise linear proportional control. This...
The transition of the European electrical energy system leads to rising installations of renewable energy sources (RES). Average transmission distances and active and reactive power losses increase, because RES are mainly installed at sites with a high yield of primary energy. This development affects the voltage stability of the system. To address these challenges, a meshed high voltage direct current...
The transition of the power grid with fewer reactive power sources demands new solutions to locally compensate reactive power in order to reduce transmission losses in the extra high voltage grid. The capability of high voltage clusters to meet these requirements is evaluated in this paper taking different approaches into account. The feasible contribution of distributed energy resources to provide...
Because of the increasing share of renewable energies violations of the statuary voltage limits occur more and more often in the German distribution grids. Therefore, distribution system operators take advantage of reactive power support by dispersed generation units for voltage regulation. Commonly, only one standard cosφ(P)-profile is implemented as a control-method for all units to decrease voltage...
High Voltage Direct Current (HVDC) systems are gaining importance in the currently planned grid reinforcements throughout Europe. The state-of-the-art Voltage Source Converter (VSC) technology allows the connection of multiple DC converters to meshed DC grids. A key topic of ongoing research in the field of DC grids is the task of maintaining the DC system's power balance by controlling the DC voltage...
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