Impact of the correct modeling of low voltage grid with high DG share on the medium voltage grid calculations
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Paper number
1669
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Schirmer, Christian, TU Wien, Austria
Kloibhofer, Lukas, TU Wien, Austria
Groiß, Christoph, Salzburg Netz GmbH, Austria
Ilo, Albana, TU Wien, Austria
Kloibhofer, Lukas, TU Wien, Austria
Groiß, Christoph, Salzburg Netz GmbH, Austria
Ilo, Albana, TU Wien, Austria
Abstract
The penetration of distributed generators are effecting the operation of power grids. They, especially photovoltaics, are commonly connected via an inverter to low voltage grids and equipped with a local Volt/var control schema. Usually, when calculating medium voltage grids, low voltage grids are modelled using lumped loads. In the case of Q(U) controlled PV systems, this modelling approach does not correctly reflect the reactive power behaviour of low voltage grids. This work analyses the impact of the correct modelling of low voltage grids with high PV share on the voltage and reactive power behaviour of the superordinate voltage levels. Results show that a more realistic modelling of the there do exist discrepancies between the lumped load modelling approach and the real reactive power behaviour of low voltage grids. The reactive power consumption of the whole low voltage grid increases with the rising of low voltage bus bar voltage on the secondary side of the distribution transformer. It is shown that this changed reactive power behaviour of low voltage grids has significant impacts on the voltage levels in the high and medium voltage grids.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Published in
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/513
http://dx.doi.org/10.34890/738
http://dx.doi.org/10.34890/738
ISSN
2032-9644
ISBN
978-2-9602415-0-1