Cost Functions Over Feasible Power Transfer Regions of Virtual Power Plants
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AbstractA virtual power plant (VPP) facilitates the integration of distributed energy resources (DERs) for transmission-level operations. A challenge in operating a VPP is to characterize the cost function over its feasible power transfer region under DERs' uncertainties. To address this challenge, a characterization method is proposed for the intraday operation of a VPP with nonanticipativity and robustness considerations to DERs' uncertainties. The characterization stems from designing operational requirements subject to nonanticipativity and robustness, by which a feasible power transfer region across all the time periods is constructed by boundary points at each time period and time-coupling constraints. Furthermore, a cost function over the feasible power transfer region is formulated as the combination of convex piecewise surfaces and a constant compensation cost. Finally, a perspective to analyze the impacts of DERs' uncertainties on feasible power transfer regions is studied. Numerical experiments in the IEEE 33-bus and 136-bus systems show that 1) our feasible power transfer region fulfills nonanticipativity and robustness to face DERs' uncertainties, 2) our cost function covers the true operational cost of a VPP, and 3) impacts of DERs' uncertainties on feasible power transfer regions can be measured by the product of their fluctuation intervals and system parameters.
Acceptance Date08/08/2022
All Author(s) ListWei Lin, Changhong Zhao
Journal nameIEEE Systems Journal
Volume Number17
Issue Number2
Pages2950 - 2960
LanguagesEnglish-United States

Last updated on 2024-09-04 at 00:38