Photoluminescence-Imaging-Based Evaluation of Non-Uniform CdTe Degradation

Steven Johnston, David Albin, Peter Hacke, Steven Harvey, Helio Moutinho, Mowafak Al-Jassim, Wyatt Metzger

Research output: Contribution to conferencePaper

4 Scopus Citations


A control algorithm is designed to smooth the variability of PV power output using distributed batteries. The tradeoff between smoothing and battery size is shown. It is also demonstrated that large numbers of highly distributed current, voltage, and irradiance sensors can be utilized to control the distributed storage in a more optimal manner. It is also demonstrated that centralized energy storage control for PV ramp rate smoothing requires very fast communication, typically less than a 15-second update rate. Finally, advanced inverter dynamic reactive current is shown to provide voltage variability smoothing, hence reducing the number of voltage regulator tap changes without energy storage.
Original languageAmerican English
Number of pages4
StatePublished - 2018
Event2017 IEEE 44th Photovoltaic Specialist Conference (PVSC) - Washington, D.C.
Duration: 25 Jun 201730 Jun 2017


Conference2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)
CityWashington, D.C.

NREL Publication Number

  • NREL/CP-5K00-67855


  • accelerated aging
  • electroluminescence
  • II-VI semiconductor materials
  • imaging
  • photoluminescence
  • photovoltaic cells
  • reliability
  • thermal analysis


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