2014 PV Performance Modeling Workshop: Ground Irradiance Data: Justin Robinson, GroundWork:

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2014 PV Performance Modeling Workshop: Ground Irradiance Data: Justin Robinson, GroundWorkGround Irradiance Data: Justin Robinson, GroundWork
May 7, 2014

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2014 PV Performance Modeling Workshop: Ground Irradiance Data: Justin Robinson, GroundWork:

  1. 1. Sandia/EPRI 2014 PV Systems Symposium Ground Irradiance Data Justin Robinson
  2. 2. Proprietary and Confidential GroundWork Renewables, Inc.
  3. 3. Proprietary and Confidential GroundWork Renewables, Inc. GroundWork’s goal is to deliver revenue-grade ground irradiance data to solar power modelers Our Solar Monitoring Station (SMS) programs include: ! Program and System Design and Submittals ! Equipment Supply, Fabricate and Test ! SCADA Integration ! Install, Commission and Validate ! Operations and Maintenance ! Data Quality Assurance (GroundWatch)
  4. 4. Proprietary and Confidential GroundWork Renewables, Inc.
  5. 5. Proprietary and Confidential GroundWork Renewables, Inc. Use of Ground Irradiance Data Gather lower uncertainty irradiance data if.... secondary standard, site-specific and maintained Tune satellite data for lower uncertainty resource assessment Capture micro-climates and albedo http://kippzonen-blog.nl
  6. 6. Proprietary and Confidential GroundWork Renewables, Inc. Solar Radiation Terms GHI: Global Horizontal Irradiance DNI: Direct Normal Irradiance DHI: Diffuse Horizontal Irradiance GPOA: Global Plane of Array Irradiance http://rredc.nrel.gov
  7. 7. Proprietary and Confidential GroundWork Renewables, Inc. Component Sum Calculation Sza: Solar Zenith Angle GHI = DNI * cos(Sza) + DHI http://esrl.noaa.gov
  8. 8. Proprietary and Confidential GroundWork Renewables, Inc. GHI Calculated from measured DNI and DHI Measured with Pyranometer Measured with Si-Photodiode
  9. 9. Proprietary and Confidential GroundWork Renewables, Inc. GPOA Measured with pyranometer at tilt and azimuth of array Estimated from DNI and DHI
  10. 10. Proprietary and Confidential GroundWork Renewables, Inc. DNI Measured with pyrheliometer Calculated by Rotating Shadowband Radiometer (RSR)
  11. 11. Proprietary and Confidential GroundWork Renewables, Inc. DHI Measured with shaded pyranometer (shadowball assembly) Measured with RSR Calculated from DNI and GHI
  12. 12. Proprietary and Confidential GroundWork Renewables, Inc. SMS Considerations Pyranometer class Sensor orientation and mounting Redundant irradiance sensors Temperature correction Inclement weather Ancillary measurements Power budget & diagnostics Soiling studies
  13. 13. Proprietary and Confidential GroundWork Renewables, Inc.
  14. 14. Proprietary and Confidential GroundWork Renewables, Inc. SMS Types Redundant GHI GHI + GPOA RSR + GHI Sun Tracker with GHI, DNI, DHI
  15. 15. Proprietary and Confidential GroundWork Renewables, Inc. Redundant GHI Low uncertainty GHI ground data Provides for both data quality assurance and data continuity Horizontal position is easy to maintain and verify
  16. 16. Proprietary and Confidential GroundWork Renewables, Inc.
  17. 17. Proprietary and Confidential GroundWork Renewables, Inc. GHI + GPOA Fixed GPOA at defined angle GPOA measures albedo (ground reflection) Provides some data quality assurance and data continuity GPOA introduces tilt error GPOA orientation is more difficult to maintain and verify
  18. 18. Proprietary and Confidential GroundWork Renewables, Inc.
  19. 19. Proprietary and Confidential GroundWork Renewables, Inc. RSR + GHI RSR measures DHI and GHI; Calculates DNI Underestimation of DHI under clear sky conditions Limited data quality assurance of dissimilar instruments No data continuity of lower uncertainty GHI DHI is required by SCE; RSR is an acceptable option
  20. 20. Proprietary and Confidential GroundWork Renewables, Inc.
  21. 21. Proprietary and Confidential GroundWork Renewables, Inc. Sun Tracker with GHI, DNI, DHI Measures GHI, DNI, DHI Calculated GHI has lowest uncertainty Excellent data quality assurance and data continuity Upfront investment limits usage in development Maintenance regime is more rigorous and costly
  22. 22. Proprietary and Confidential GroundWork Renewables, Inc.
  23. 23. Proprietary and Confidential GroundWork Renewables, Inc. Ground Metadata Commissioning documentation and change logs Sensor make, model and class Datalogger program Photo-set Sensor calibration certificates O&M frequency and logs Periodicity of data review
  24. 24. XX.XXXXXX, -XXX.XXXXX Solar Project, CA
  25. 25. Proprietary and Confidential GroundWork Renewables, Inc. Ground Data Reasonableness Characterize system uncertainty Correlate data with cleaning events Compare redundant sensors and/or component sum values Evaluate symmetry of irradiance curves Compare clear sky transmittance indices (NREL SERI QC)
  26. 26. Proprietary and Confidential GroundWork Renewables, Inc. Cleaning Event
  27. 27. Proprietary and Confidential GroundWork Renewables, Inc.
  28. 28. Questions

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