Overvoltage due to single-phase and three-phase connected PV and what to do about it

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CIRED 2019 - 370.pdf (1.17 MB)
Paper number
370
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Mulenga, Enock, Luleå University of Technology, Sweden
Bollen, Math, Luleå University of Technology, Sweden
Etherden, Nicholas, Vattenfall R&D, Sweden
Abstract
This paper presents the overvoltage caused by single and three-phase connected PV to a low-voltage distribution grid. Statistics are obtained based on source-impedance data for 40 000 customers. A stochastic approach is applied to a 28-customer low-voltage network and the probability of overvoltage is assessed. It is shown that the voltage rise due to single-phase connected PV is six times the rise for three-phase connected PV. To mitigate the overvoltage, grid-reinforcement, reactive power compensation, curtailment and coordinated connection of PV can be used. It is shown that reactive compensation is not effective in LV grids due to high R/X ratio. Coordinated connection helps in reducing the overvoltages caused by single-phase PV. Policy suggestions towards three-phase PV installations and coordinated single-phase PV connections are included in the paper.
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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/20.500.12455/820
http://dx.doi.org/10.34890/1036
ISSN
2032-9644
ISBN
978-2-9602415-0-1