Dynamic Thermoelectric Modelling of Oil-filled Transformers for Optimized Integration of Wind Power in Distribution Networks

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CIRED 2019 - 1744.pdf (660.77 KB)
Paper number
1744
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Kazmi, Syed Hamza Hasan, Orsted Offshore Wind A/S, Denmark
Holbøll, Joachim, Technical University of Denmark (DTU), Denmark
Olesen, Thomas Herskind, Orsted Offshore Wind A/S, Denmark
Sørensen, Troels Stybe, Orsted Offshore Wind A/S, Denmark
Abstract
Oil-filled power transformers are some of the most critical components in the distribution network. The grid upgrade cost along with congestion challenges associated with rapid increase in onshore wind energy integration in the distribution system can partly be resolved by dynamic loading of transformers. Distribution transformers can be dynamically rated if the temperatures, especially Top-Oil (TOT) and Hot-Spot (HST) temperatures, are accurately determined. This paper presents industry’s well-proven and established differential equations-based thermoelectric models for transformers. The models are validated, and the performances are compared with the measured temperatures for a 6.8 MVA wind turbine transformer. Moreover, the thermal lifetime utilization of the test transformer is calculated based on its loading and ambient conditions history for the year 2017, using the recommendations of international loading guides. The annual thermal variations and lifetime utilization of test distribution transformer are assessed for an increase in wind energy production in 2017. Based on this analysis, further wind energy integration is facilitated by deferring grid expansion costs related to transformers
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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/20.500.12455/549
http://dx.doi.org/10.34890/771
ISSN
2032-9644
ISBN
978-2-9602415-0-1