Demand flexibility modelling for optimal distribution grid planning
Challenge and objective
Tools for long-term optimal grid planning considering flexibility resources require aggregated flexibility models that are not too computationally demanding or complex. Still, they should capture the operational benefits of flexibility sufficiently accurately for planning purposes.
In collaboration with in-kind project H2020 FlexPlan, an aggregated flexibility model is implemented in an open-source grid planning tool.
This "planning model" is compared with a detailed demand flexibility model for electric water heaters and white goods.
A case study demonstrates that it is important to take into account time dependences, rebound effects etc. characterising the flexibility resources (such as electric water heaters).
Impact for distribution system innovation
In assessing flexibility in grid planning studies, one should be aware that a too simple model of the operational behaviour of demand flexibility may overestimate the benefits as an alternative or supplement to grid investments.