Adeel Jamal M.Sc.
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StabLe – Stabilität von Verteilnetzen mit vorwiegend Leistungselektronisch angekoppelten Speichern, Erzeugungseinheiten und Verbrauchern
The transformation of the electrical energy supply in Germany, commonly referred to as the energy turnaround, is characterised by the transition from a system with central generation, within large power plant units with approx. 1 GVA of electrical power output, to a system in which the generating units are low-powered and decentralised. These small and medium-sized generating units (wind power, photovoltaics, CHPs) and storage systems with connected loads of up to approx. 10 MVA are almost exclusively connected to the medium and low-voltage grid via power electronic systems (inverters, in particular “Active Infeed Converter”).
This project primarily addresses technical issues. These questions essentially result from the fact that the stability and power supply quality in the case of a large number of decentralised generation plants connected via inverters is no longer determined by the intrinsic behaviour of large machine sets (overload capacity, mass inertia), but by the behaviour implemented in the inverter. As a limiting case, one can assume that the grid is fed exclusively by inverter-coupled generators.
The overall objective of the project is to develop and test procedures and methods for the stable operation of an energy supply network with a large number of decentralised consumers connected via inverters and thus to guarantee high quality and reliability.
• Investigation of the effect of islanding of distribution networks in the medium and low voltage range on network stability
• Further development of methods for determining network impedance
• Investigation to what extent measurement signals of the power converters used can be used to observe the grid. Subsequently, it will be tested how these signals can be used, for example, to detect faults in the grid or to detect a transition into the isolated grid.
• Investigation of decentralized algorithms at converter level. These aim in particular at the basic frequency voltage and current control at the outputs of the power converters.