Survey of network impedance in the frequency range 2-9 kHz in public low voltage networks in AT/CH/CZ/GE

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CIRED 2019 - 1398.pdf (1.5 MB)

Paper number

1398

Working Group Number

Conference name

CIRED 2019

Conference date

3-6 June 2019

Conference location

Madrid, Spain

Peer-reviewed

Yes

Short title

Convener

Authors

Stiegler, Robert, Technische Universität Dresden, Germany
Meyer, Jan, Technische Universitaet Dresden, Germany
Höckel, Michael, Bern University of Applied Sciences, Switzerland
Schori, Stefan, Bern University of Applied Sciences, Switzerland
Scheida, Karl, Österreichs E-Wirtschaft, Austria
Hanžlík, Tomáš, EGC – EnerGoConsult CB s.r.o., Czech Republic
Drápela, Jiří, Brno University of Technology, Czech Republic

Abstract

Setting realistic emission limits for distorting customer installations is a crucial requirement for a reliable and disturbance-free operation of public distribution networks. Therefore only an adequate share of the total allowable voltage distortion (compatibility level) has to be allocated to each customer installation. This allowable contribution of a single customer installation is usually small and difficult to assess. Hence, nowadays most standards and guidelines translate the allocated voltage distortion in a respective current distortion by using the network impedance at the considered frequency. As frequency-dependent network impedance is usually not known during the planning process, assumptions are required, which have to be realistic and not too conservative. This applies in particular to frequencies above 2 kHz, where the usually used extrapolation based on short circuit impedance can be very conservative due to the increasing impact of connected customer equipment on the network impedance. Based on a comprehensive measurement campaign in four different countries this paper identifies typical ranges of the frequency-dependent network impedance in the frequency range 2-9kHz. It analyses the impact of short circuit power and proposes a simplified impedance estimation, which can be used to calculate realistic current emission limits in the planning stage.

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Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

Permanent link to this record

https://cired-repository.org/handle/20.500.12455/401
http://dx.doi.org/10.34890/628

ISSN

2032-9644

ISBN

978-2-9602415-0-1