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2022 | OriginalPaper | Buchkapitel

4. Volt/var Chain Process*

verfasst von : Daniel-Leon Schultis, Albana Ilo

Erschienen in: A Holistic Solution for Smart Grids based on LINK– Paradigm

Verlag: Springer International Publishing

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Abstract

The massive connection of renewable and distributed generation and the electrification of other sectors give rise to new challenges and opportunities that call for an adaption of the traditional Volt/var control schemes. Recently introduced cosφ(P)- and Q(U)-control of photovoltaic inverters and on-load tap changers in distribution substations to mitigate voltage limit violations provoke massive technical and social problems. This chapter conducts a comprehensive and systematic holistic study to analyse the Volt/var behaviour on the medium- and low voltage levels, focusing on high-medium and medium-low voltage grid boundaries. The recently emerged and newly introduced control strategies are considered. Their evaluation shows that the X(U)-control in radial structures combined with Q-Autarkic customer plants maintains voltage limits reliably, effectively, and efficiently, while preserving the interests of all involved stakeholders. It also clarifies that voltage limits do not remain constant throughout the day, introducing the concept of "boundary voltage limits" for the first time. Additional, practical modelling steps are suggested.

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Fußnoten
1
Machine-side VSC, DC link capacitor, and grid-side VSC.
 
2
Series reactive power contribution is sometimes used in distribution level to secure the supply of factories against voltage dips [79].
 
3
These constraints apply exclusively to the boundary node between Grid-Link_1 and Grid-Link_2.
 
4
RDPs are commonly used in industrial CPs.
 
5
Positive algebraic sign for reactive power absorptions.
 
6
The following parameters that correspond to a LV overhead line with a length of 100 m are used: Unom = 230 V, R = 0.03264 Ω, X = 0.03557 Ω.
 
7
Positive algebraic sign for active power injection and reactive power absorption.
 
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Metadaten
Titel
Volt/var Chain Process*
verfasst von
Daniel-Leon Schultis
Albana Ilo
Copyright-Jahr
2022
DOI
https://doi.org/10.1007/978-3-030-81530-1_4