2014 PV Performance Modeling Workshop: AE's Perspective on PV Inverter Modeling Opportunities: Tucker Ruberti, Advanced Energy

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2014 PV Performance Modeling Workshop: AE's Perspective on PV Inverter Modeling Opportunities: Tucker Ruberti, Advanced Energy

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2014 PV Performance Modeling Workshop: AE's Perspective on PV Inverter Modeling Opportunities: Tucker Ruberti, Advanced Energy

  1. 1. AE Internal and Confidential ® Sandia PV Performance Modeling Workshop May 5th 2014 Tucker Ruberti
  2. 2. AE Internal and Confidential Inverter Performance Modeling Perspective Three Categories of Opportunities: 1. Immediate Opportunities for Improvement 2. Emerging Needs that require heavy(ish) lifts 3. Intellectually interesting, but maybe not worth the effort 2
  3. 3. AE Internal and Confidential Creating an .OND file (aka Inverter model for PVsyst) 3
  4. 4. AE Internal and Confidential 4 Creating an .OND file (aka Inverter model for PVsyst)
  5. 5. AE Internal and Confidential 5 Creating an .OND file (aka Inverter model for PVsyst)
  6. 6. AE Internal and Confidential 1. Immediate Opportunities for Improvement A. Better efficiency curves input I. Today: Best case is CEC default- 3 curves and 24 points II. Better: Photon International- 275 points below 6
  7. 7. AE Internal and Confidential 1. Immediate Opportunities for Improvement B. 2-Stage Inverter Modeling I. Today: very limited ability to model above/below maximum power. Ex- 450 Vdc and above 850 Vdc below II. Better: DC Voltage/Maximum Power curve, start-up/shut- down behavior modeled more accurately 7
  8. 8. AE Internal and Confidential 1. Immediate Opportunities for Improvement C. Temperature derate/inflate I. Today: Must post-process inverter derate for high ambient temp, or increase at low ambient temperature II. Better: Ambient Temperature/Maximum AC Power Curve D. 1500 Vdc System I. Today: Need to model as bi-polar. Must have even number of modules per string II. Better: Simply Add an option for 1500 Vdc systems D. Multi-Orientation on one inverter I. Today: Need to model as 2 inverter II. Better: Define 2 or 3 “arrays” for an inverter, even on a single MPPT tracker 8
  9. 9. AE Internal and Confidential 2. Emerging Needs that require heavy(ish) lifts A. AC Line Voltage Derate I. Today: Inverters can behave in VERY unexpected ways at low AC line voltage, especially when there is low DC voltage, and reactive power demand II. Better: Publish derate curves based on AC line voltage, at least for 1.0 PF B Power Factor/Volt-Var/1547a/1547.8/Rule 21 I. Today: No way to account for “off-unity”, voltage support, or other advanced inverter functions II. Better: I don’t know… Variability makes this very complex C. DC Coupled Storage I. Today: Exponential increase in requests for storage solutions, but solutions providers have proprietary modeling tools II. Better: Integrate storage into industry standard tools 9
  10. 10. AE Internal and Confidential 3. Intellectually interesting, but maybe not worth the effort A. Minute Level Data I. Today: Hourly weather data, static AC line voltage, fixed PF II. Better: At what point is more dynamic modeling valuable? B Dynamic MPPT Efficiency I. Today: Default for losses- No direct way to model MPPT performance II. Better: Dynamic MPPT data like IEC 53530? – Again, would require minute level data, or better… C. Reliability/Uptime I. Today: Not accounted for directly for inverter II. Better: Assign a default, start the conversation… 10
  11. 11. AE Internal and Confidential Conclusion: Real Barriers to Change 1. Manufacturers: Who moves first to share better data publicly, not just for post-processing for large projects 2. Modeling Tools: investment and time to keep improving inverter modeling as systems and applications get more complex 1. …and getting good data from manufacturers 2. Maybe on an “opt-in” basis, otherwise use defaults 11
  12. 12. AE Internal and Confidential AE World Headquarters 1625 Sharp Point Drive Fort Collins, CO 80525 800.446.9167 970.221.4670 sales.support@aei.com www.advanced-energy.com © 2014 Advanced Energy Industries, Inc. All rights reserved.
  13. 13. AE Internal and Confidential Gaming PVsyst? Selecting only DC voltages for curve input? 13

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