8 seeking synergies - data modeling & aerial inspections rob andrews
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Transcript of 8 seeking synergies - data modeling & aerial inspections rob andrews
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Data Modelling and Aerial AnalsyisSeeking Synergies
Rob Andrews, PhD
CEO, Heliolytics
Pramod Krishnani, M.S. [IEC TC – 82 PV Expert]
Manager, Performance Engineering sPower
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Presentation goals
• Introduction of Aerial infrared imaging
• Compare Aerial infrared imaging to:
– Data analysis
– Manual inspection techniques
• Recommend optimal DC O&M scopes
• ROI considerations
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• Provides aerial Module Level Thermal Audits (MLTA)
• C&I and Utility scale systems
• Commercial operation October 2015
• >1GW scanned to date
• Proprietary technology to collect and analyze high resolution infrared and visible imagery
• Based in Toronto, ON, operates internationally
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MLTA- Data collection
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Outputs
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Comparison of IR data to Combiner data
• Key Question:
– Can module and string level defects be detected with combiner data alone?
• Approach:
– Generate multiple methodologies for analyzing system data and compare these outputs
to aggregated failures per combiner
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Raw Data
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Spatially Resolved Combiner-level data
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Spatially Resolved Combiner-level data
Absolute performance Relative performance
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Spatially Resolved Combiner-level data
9:15 am 12:15 pm 4:45 pm
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Evaluation Methodologies
• Methodology #1
– Calculate sum of energy produced with the following restrictions:
• Non-clipping
• Within a 1 month window around the scan
• Normalized by Isc of strings attached to combiner
• Methodology #2
– Calculate Normalized DC Performance Index (DCPI) with the following restrictions:
• Non-clipping
• Curtailment data points removed
• Within identified clear sky day
• All data set removed below 200 W/m2 POA Irradiance
• Uncertain DCPI calculation removedDCPI =
𝑰𝒎𝒆𝒂𝒔𝒖𝒓𝒆𝒅𝑮𝑷𝑶𝑨
𝑰𝒏𝒐𝒎𝒊𝒏𝒂𝒍 (𝒂𝒔 𝒑𝒆𝒓 𝒅𝒆𝒔𝒊𝒈𝒏)
𝑮𝑺𝑻𝑪(Courtesy of formula Improvement by Tassos Golnas, PhD)
(1)
(1)
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Spatially resolved performance index
Methodology #1
Performance Index
Methodology #2
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Methodology #1 Results
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Methodology #2 results
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Conclusions from data analysis
There is too much uncertainty in the basic combiner-level data to detect
individual module faults
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Manual Fault detection
• Traditionally, multimeter or I-V checks
at a combiner level are used to detect
faults at a combiner level
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Manual Fault detection results
• Site was inspected using combiner box checks of Voc and Impp
– September 2015- 6 months prior to site inspection
• Hit rate for manual inspection: 22%
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DC measurement campaign goals
• Find Broken modules/Strings
– Partial system checks can leave parts of the system offline for multiple years
– Manual techniques regularly miss DC outages (on the order of 0.5%-0.7% energy loss)
• Detect degredation
– Bulk I-V or other manual techniques have structural limitations to their accuracy
Increasing ‘efficiency’
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Ideal DC measurement campaign
• Periodic MLTA to detect DC availability loss– Yearly scans if tracking an active fault mode, less frequent if site is proven to be low risk
• Regular I-V tracing of specified “golden” strings– Minimum one string per manufacturing batch.
– Initial 3rd party flash test of all modules. I-V immediately after re-install to identify field testing bias.
• Alt: Install “field flash test” persistent I-V tracers
– Annual or bi-annual module level I-V of “golden” string.
• Control for Irradiance level, Angle of Incidence, utilize multiple temperature probes per module
– Periodic re-flash (2-5 year)
• Alt: Periodic re-use of calibrated persistent I-V tracers
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Value add of aerial infrared inspections
Asset Management Performance Engineering
Safety
Financial Management
Detect Module malfunctions
Warranty Implications
Dispatch Control
Site Cleaning
Performance Guarantee Optimization
Model Improvement
Performance model calibration
O&M Contractor Evaluation
Acceptance Testing
Field Optimization
Future Purchase Decisions
Asset Valuation
Evaluate Availability
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ROI of aerial inspections
• Increased site output
– A large cost of remediating DC
issues is in accurately finding
them
– Accurate identification decreases
remediation costs and increases
system availability
• Decreased site labour costs
– NREL/SunSpec cost model
Energy weighted DC unavailability by asset class (800MW sample)
Procedure Cost
I-V, Voc or Current clamp checks
$814/MW
IR camera inspection $852/MW
Module electrical connection test and visual inspection
$278/MW
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Questions?