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Open Access Publications from the University of California

The impact of short-term stochastic variability in solar irradiance on optimal microgrid design:

  • Author(s): Schittekatte, Tim
  • Stadler, Michael
  • Cardoso, Gonçalo
  • Mashayekh, Salman
  • Narayanan, Sankar
  • et al.
Abstract

This paper proposes a new methodology to capture the impact of fast moving clouds on utility power demand charges observed in microgrids with photovoltaic (PV) arrays, generators, and electrochemical energy storage. It consists of a statistical approach to introduce sub-hourly events in the hourly economic accounting process. The methodology is implemented in the Distributed Energy Resources Customer Adoption Model (DER-CAM), a state of the art mixed integer linear model used to optimally size DER in decentralized energy systems. Results suggest that previous iterations of DER-CAM could undersize battery capacities. The improved model depicts more accurately the economic value of PV as well as the synergistic benefits of pairing PV with storage.

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