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Impact of reliability of supply on long-term development approaches to electricity distribution networks

Haakana, Juha (2013-12-05)

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isbn9789522655080.pdf (2.189Mb)
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Väitöskirja

Haakana, Juha
05.12.2013
Lappeenranta University of Technology

Acta Universitatis Lappeenrantaensis

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Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:978-952-265-508-0

Tiivistelmä

The Finnish electricity distribution sector, rural areas in particular, is facing major
challenges because of the economic regulation, tightening supply security requirements
and the ageing network asset. Therefore, the target in the distribution network planning
and asset management is to develop and renovate the networks to meet these challenges
in compliance with the regulations in an economically feasible way. Concerning supply
security, the new Finnish Electricity Market Act limits the maximum duration of
electricity supply interruptions to six hours in urban areas and 36 hours in rural areas.
This has a significant impact on distribution network planning, especially in rural areas
where the distribution networks typically require extensive modifications and
renovations to meet the supply security requirements.
This doctoral thesis introduces a methodology to analyse electricity distribution system
development. The methodology is based on and combines elements of reliability
analysis, asset management and economic regulation. The analysis results can be
applied, for instance, to evaluate the development of distribution reliability and to
consider actions to meet the tightening regulatory requirements. Thus, the methodology
produces information for strategic decision-making so that DSOs can respond to
challenges arising in the electricity distribution sector. The key contributions of the
thesis are a network renovation concept for rural areas, an analysis to assess supply
security, and an evaluation of the effects of economic regulation on the strategic
network planning. In addition, the thesis demonstrates how the reliability aspect affects
the placement of automation devices and how the reserve power can be arranged in a
rural area network.
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PL 20
53851 Lappeenranta
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PL 20
53851 Lappeenranta
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