Abstract
This paper examines the results of the distributed generation penetration in large-scale medium-voltage power distribution networks. The network examined as a study case consists of twenty one lines fed by three power substations. The injected power comes mainly from photovoltaic units. Specifically, the influences of distributed generation on the network branch currents, losses and voltage profile as well as on the short-circuit level at the medium voltage busbars of the infeeding substations are examined according to international and national standards. The arising problems are explored and technical solutions are proposed. This paper is a pilot application as general conclusions concerning the extended distributed generation penetration in real power distribution networks are set out.
Highlights
In recent years, increasing amounts of distributed generation (DG) have been connected to distribution networks
In light of the above situation, this paper investigates the results of DG penetration in a large-scale Medium Voltage (MV) distribution network as a pilot application
The purpose of this paper was to investigate the impacts of DG penetration in a real rural MV power distribution network
Summary
In recent years, increasing amounts of distributed generation (DG) have been connected to distribution networks. The challenge is to identify suitable DG locations and ratings in distribution networks with respect to technical or economic constraints, which will enable a high DG penetration and avoid network sterilisation which results when capacity is allocated to bus/buses whose voltage and/or short-circuit levels (SCLs) are most sensitive to power injections. The optimal DG allocation on distribution networks is the most interesting research point, the most common practical question is whether DG resources of a particular type and rating can be connected at predetermined network positions without causing technical problems [6] and, if possible, without changing the network structure This is determined by the specific requirements of independent producers. The results arising from this real-world case study can be used as a pilot for the relevant analysis required for every relative network
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