Storage end effects: An evaluation of common storage modelling assumptions. (February 2020)

• Record Type: Journal Article
• Authors: Niet, T.
• Is Part Of: Journal of energy storage. Volume 27(2020)
• Publication Date: 2020-02
• Subjects: Storage modelling -- Renewable integration -- Numerical methods -- Storage operation; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2019.101050
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: Methods of modelling storage are compared within an economic dispatch model. Different methods provide different results depending on the model structure and assumptions. Modellers need to carefully consider the model structure they implement and how the choice impacts their results. Abstract: High temporal resolution modelling of energy systems often requires modelling a number of sub-periods, with the end condition of one sub-period being used to seed the next. When storage is modelled a challenge is to keep the model from draining the stored energy at the end of each sub-period. A common approach is to model extra-long sub-periods and to discard this end effect, increasing computation time. Another approach is to require refilling for each sub-period but this introduces a stored energy jump between sub-periods. This paper compare these methods to the alternative of assigning a monetary value to the stored energy at the end of each sub-period using an economic dispatch energy system model. Overall, effective storage modelling is challenging and both the choice of model structure and the value of stored energy impacts storage operation.