Enhanced generation, energy storage and transmission expansion planning for renewables with operational flexibility through Unit Commitment

Semini Wijekoon, Ariel Liebman, Aldeida Aleti, Simon Dunstall

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch


In this paper, we investigate the impact of operational flexibility in planning context considering four operational models; Economic Dispatch (ED), ED with ramping, Unit Commitment (UC) and UC with convex relaxation (UC-C). Using these operational models and three test cases; 6, 14, 24 bus systems, we quantify the error that occur due to exclusion or approximation of flexibility c onstraints. N umerical a nalysis r eveals t hat this error in total cost can be as high as 8% and that approximated operational models such as ED, ED+R or UC-C could provide sub-optimal solutions with inefficient capacity mix. Even though the impact of sub-optimal solutions is minor in the observed set of experiments, this could be problem specific. As these solutions are driven by multiple factors such as network topology, candidate availability and other input parameters, a constrained system with limited options is more likely to be affected by approximated operational flexibility.

Original languageEnglish
Title of host publicationProceedings - International Conference on Modern Electric Power Systems, MEPS 2019
EditorsJan Iżykowski
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781728116419, 9781728116402
ISBN (Print)9781728116426
Publication statusPublished - 2019
EventModern Electric Power Systems (MEPS) 2019 - Wroclaw, Poland
Duration: 9 Sep 201912 Sep 2019
http://www.meps19.pwr.edu.pl/?p=99 (Website)
https://ieeexplore.ieee.org/xpl/conhome/9394948/proceeding (Proceedings)


ConferenceModern Electric Power Systems (MEPS) 2019
Abbreviated titleMEPS 2019
Internet address


  • capacity planning
  • Decomposition
  • Operational flexibility
  • Unit commitment

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