| Abstract |
The increasing number of decentralised regenerative feeders poses new challenges regarding a securegrid operation and grid stability. Until now, conventional power plants have taken on the task of providingancillary services to ensure the stability of the grid. These include the provision of instantaneous reserve,frequency-dependent provision of active power and voltage-dependent provision of reactive power, butalso island grid operation and grid restoration. Due to the shutdown of conventional power plants, thesetasks will increasingly also have to be offered by decentralised regenerative feeders.Compared to conventional power plants, converter-based regenerative feeders have no rotating massesor damping. Also, common current-based control methods require an existing grid for synchronisation.Therefore, the stated requirements cannot be fulfilled at all or only to a limited extent.In recent years, concepts have been developed that increasingly deal with this topic. Essential approacheshere are the emulation of the behaviour of synchronous machines in the control of converters and the useof voltage-based control methods. Thus, the decentralised regenerative feeders can also contribute togrid stability through virtual inertia and damping.This paper introduces a control approach that corresponds structurally to the common current-basedcontrol procedures of wind turbines. But in comparison, there is no need for a dedicated grid synchronisation.Furthermore, this approach has the inherent ability of island grid operation and black startcapability. |
