PVCatapult WP9 Performance Modelling

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PV-Catapult WP9 Performance Modelling

• Ralph Gottschalg, Sheryl Williams, Wlodzimierz
  Kolodenny, Mariusz Prorok, Tadeusz Zdanowicz,
  Antoine Guerin de Montgareuil, Nico van der Borg,
  Teun Burgers, Hugo de Moor, Gabi Friesen, Dirk
  Stellbogen, Hans-Dieter Mohring

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Outline

• Overview of Aims and Objectives
• Approach
• Review of modelling methodologies evaluated in
  the RR
• Results of RR1
• Results of RR2
• Conclusions

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Aim of this WP

• Plan and execute one modelling round robin (RR)
  test
• Evaluate State of the Art of European
  Photovoltaic Module Modelling
• Identify measurement accuracy of European
  measurement methodologies limited to modules
• Demonstrate that a 5 accuracy is possible
• Performance also added
• Identify pitfalls for future RR
• Make available knowledge and infrastructure to
  Performance

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Partners

• Modelling Partners
• CEA
• CREST
• ECN
• SUPSI
• WrUT

• Data and other input
• FhG-ISE
• JRC
• TTU
• TÜV
• ZSW

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Timeline

• Start of work November 2004
• Questionnaire of current methods sent out January
  2005
• First RR completed June 2005
• Re-Modelling of same site/module/year (ideal
  case)
• Modelling same module at same site, different
  year
• Second RR completed January 2006
• Predicting same site, different module
• Predicting different module, different site
• Predicting same module, different site
• Dissemination/discussion meeting for future work
  January 2006

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European Performance Models
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1st Round Robin

• How different are the different sites
• How accurate are modelling approaches in ideal or
  close to ideal conditions

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Sites for testing
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Effect of Data Treatment Variation amongst the
Different Modelling Groups
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Comparison of Energy Yield (measured vs modelled)
Year 1
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Comparison of Energy Yield (measured vs modelled)
Year 2
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Lessons Learnt RR1

• ORGANIZATIONAL
• Dataset format
• Database Structure
• Data filter and handling
• Not as conclusive as wanted because groups
  dropped out (budget cuts)
• Late start but on time to complete all tasks

• SCIENTIFIC
• Temporal predict was successful, virtually all
  lt6
• Different sites result in different accuracy
• Surprisingly small problems for double junction

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Comparison of MethodologiesZSW Dataset
Base Modules
Predicted Modules
CIS_6 CdTe_17
CIS_16 CdTe_20
Same Loc.
CIS_17 CIS_20 CdTe_1 CdTe_4
Different Loc.
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2nd Round Robin

• How much does the module variability influence
  energy calculations
• How well can we cope with the variability in TF
  devices
• Are there site specific differences between the
  different data sets
• Test
• Same site different module
• Same module different site
• Different module, different site

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Results of 2nd RR (ZSW Dataset)
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Results of 2nd RR (ZSW Dataset)
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Comparison of MethodologiesPVCatapult Meas. RR
Dataset
Predicted Modules
Base Modules
Loc.1
SolarLab
CEA
Loc.2
ECN
CREST
Loc.3
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Comparison of MethodologiesPVCatapult Meas. RR
Dataset
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Results of 2nd RR( PVCatapult Dataset)
Measured at ECN
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Lessons Learnt

• Module to module production effect dominate
• Modelling based on outdoor measurements needs
  careful cleaning
• Overfiltering might result in statistically
  insignificant corrections which might introduce
  large errors
• Not detecting/cleaning outliers will result in
  deviations also introducing large errors
• Models work well for c-Si
• Accuracy not as good as desirable for thin films

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Conclusions

• Main impact is the module-to-module variation
• Different environments are no problem if the
  module data is known accurately
• Error analysis of the measurement campaign is
  ongoing
• The work of WP9 provide a good foundation for
  further investigation of performance modelling

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Dissemination Efforts
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Workshop

• 35 participants
• Visitors from US Japan
• Presentation of results
• Discussion of
• Presentations in general
• Further need for research

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Publications

• EUPVSEC-20, Barcelona
• Williams, S. R., et al. (2005) Evaluating the
  State of the Art of Photovoltaic Performance
  Modelling in Europe.
• WCPEC-3
• Zdanowicz, T. et al (2006) Photovoltaic
  Performance Measurements in Europe PV-Catapult
  Round Robin Tests
• EuroSun 2006
• Strobel, M.B. et al (2006) Measurement Accuracy
  of Energy Yield of Photovoltaic Systems

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Publications 2

• Dresden
• Gottschalg et al (2006) Round Robin Comparison
  of European Outdoor Measurement Systems
• Gottschalg et al (2006) Variability of
  Electrical Parameters Determined by Using
  Different Solar Simulation Systems for Different
  PV Module Technologies
• Williams et al (2006) Variability of Electrical
  Parameters Determined by European Research
  Facilities for Different PV Module Technologies

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Other Dissemination Efforts

• Expert participation in IEA-PVPS Task 2
• Expert participation in IEA TC82-WG2
• Expert participation in CENELEC TC82-WG1
• WP 8/9 asks question, IP Performance will answer
  these