Selection of representative slices from historic load and generation time series using regular decomposition

Niina Helistö (Corresponding Author), Juha Kiviluoma, Hannu Reittu

Research output: Contribution to journalArticleScientific

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A generalized clustering method, referred to as regular decomposition, was applied to a long-term power system planning study covering countries in the Northern Europe. The aim of the method was to reduce the temporal resolution by selecting representative periods concurrently from load time series and variable generation capacity factor time series. Two versions of the method were employed: one with overlapping candidates and one without overlapping candidates. The method was compared to other selection methods as well as using full year time series in the planning problem. Furthermore, the comparison was repeated with various number of representative periods and in three CO2 price scenarios in order to provide more robust results. The method was also demonstrated to scale well when applied to inter-annual time series. When selecting four weeks or more, the regular decomposition method without overlapping candidates was shown to perform relatively well compared to a modified k-means method. However, regular decomposition was outperformed by a random sampling method in terms of both the computational time and total costs resulting from the power system model runs. The results highlight the need to include net load peaks in the selected periods and to carefully estimate their position in the time series.
Original languageEnglish
Number of pages22
JournalNot yet accepted into a journal
Publication statusSubmitted - 2019
MoE publication typeB1 Article in a scientific magazine


  • generation expansion planning
  • representative periods
  • power system planning
  • regular decomposition
  • variable renewable energy

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