3.8 Proceedings Paper

Modeling of Marginal Cost for PV Inverter Ancillary Services Considering Inverter Aging under Transactive Energy Framework

Publisher

IEEE

Keywords

Transactive energy system (TES); PV inverter; inverter aging; ancillary services; supply curve

Funding

  1. U.S. Department of Energy Grid Modernization Lab Consortium
  2. Engineering Research Center Program of the National Science Foundation
  3. Department of Energy under NSF [EEC-1041877]
  4. CURENT Industry Partnership Program

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PV inverters can provide ancillary services while simultaneously providing active power. A transactive energy system (TES) incentivizes a PV inverter to provide ancillary services and compensates for the cost of additional power losses due to additional reactive power production. However, providing ancillary services can shorten the lifetime of the PV inverter since additional reactive power increases the thermal stress of it. This paper models the lifetime shortening effect of a PV inverter when providing ancillary services. Based on the lifetime estimation, an improved marginal cost curve of reactive power generation for the PV inverter is proposed. The improved marginal cost considers the normalized lifetime (NLT) of the PV inverter given the active power, reactive power, and ambient temperature. The proposed NLT algorithm is validated by a simulation case study.

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