A5039648922- Photovoltaic System Optimization Techniques
- Silicon and Solar Cell Technologies
- Solar Radiation and Photovoltaics
- Solar Thermal and Photovoltaic Systems
- solar cell performance optimization
- Thin-Film Transistor Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Energy Load and Power Forecasting
- Traffic Prediction and Management Techniques
- Philosophical Thought and Analysis
- Semiconductor materials and interfaces
- Complex Network Analysis Techniques
- Graph Theory and Algorithms
- Galician and Iberian cultural studies
- Historical and socio-economic studies of Spain and related regions
- Power System Reliability and Maintenance
- Semiconductor materials and devices
- Adaptive optics and wavefront sensing
- Advanced Graph Neural Networks
Renewable Energy Systems (United States)
2021-2023
Constellation Technology (United States)
2014-2020
We present a detailed case study of degradation in monocrystalline silicon photovoltaic modules operating utility-scale power plant over the course approximately three years. results analysis on arrays within site, and find that five six degraded faster than best performing array, even though consist same manufacturer model. also describe extensive laboratory characterization returned from field, including module- cell-level current-voltage characterization, luminescence imaging, accelerated...
In this case study, we investigate a degradation mode occurring at the cell level in fielded multi-Si modules. The modules exhibit mix of affected and unaffected cells. Affected cells show progressive, series-resistance-related power as shown via module- cell-level IV curves, along with electroluminescence (EL) PL imaging module, cell, core sample scales. Scanning electron microscopy energy-dispersive X-ray spectroscopy reveal difference oxides silver paste used screen printing gridline...
The integration of the global Photovoltaic (PV) market with real time data-loggers has enabled large scale PV data analytical pipelines for power forecasting and reliability assessment fleets. Nevertheless, performance analysis depends on quality timeseries data. We propose a novel Spatio-Temporal Denoising Graph Autoencoder STD-GAE framework to impute missing Power Data. exploits temporal correlation, spatial coherence, value dependencies from domain knowledge recover It is empowered by two...
Abstract Commercial antireflective coatings (ARCs) on photovoltaic (PV) module glass can improve power by 2.5%–3.0%, but their long‐term field performance requires additional study. In this paper, we investigate ARC fielded modules using two nondestructive techniques: reflectance spectroscopy and RGB microscopy, finding a large variation in coating durability performance. For new coatings, the fleet average nominal enhancement is 2.8%. This observed to degrade at approximately −0.05%/year...
We present a case study from commercial-scale PV power plants in the US Southwest, demonstrating that accurate soiling measurement requires detection of module loss order to account for non-uniform soiling, such as along edges modules. Small amounts may cause significant losses cannot be detected accurately through measurements short-circuit current alone. Furthermore, based on aerial IR and visual inspection I-V curve data acquired at number sites, we believe phenomenon is common regions...
We report on an electrical conduction mechanism for series resistance (Rs) degradation observed in a utility-scale photovoltaic power plant by imaging the local at Ag/Si interface of c-Si front metallization. Scanning spreading microscopy with nanometer (nm) scale spatial resolution revealed that number point or small-area contacts decreased substantially degraded cell compared to unaffected cell, demonstrating root cause Rs degradation. The decrease is likely caused structural change—the Ag...
Photovoltaic (PV) modules of the same make and model are often assembled with different bills materials (BOMs). In this correspondence, we revisit two case studies utility-scale silicon PV systems in which these differing BOMs were associated faster-than-expected degradation. one sites, found that metallization paste had been used for grid lines some cells leading to loss contact cell severe series resistance We provide details on observation mechanism at additional sites not described...
The performance of a photovoltaic (PV) system depends on the weather, seasonal effects, and other intermittent issues. Demonstrating that PV is performing as predicted requires verifying functions correctly under full range conditions relevant to deployment site. This paper discusses proposed energy test applies any model explores effects differences between historical measured weather data how are intertwined in subtle ways. Implementation Energy Test case study concludes uncertainty could...
The integration of the global Photovoltaic (PV) market with real time data-loggers has enabled large scale PV data analytical pipelines for power forecasting and long-term reliability assessment fleets. Nevertheless, performance analysis heavily depends on quality timeseries data. This paper proposes a novel Spatio-Temporal Denoising Graph Autoencoder (STD-GAE) framework to impute missing Power Data. STD-GAE exploits temporal correlation, spatial coherence, value dependencies from domain...
In this case study, we investigate a degradation mode occurring at the cell level in fielded multi-Si modules. Affected cells module show progressive, series-resistance-related power observed module- and cell-level IV curves along with EL PL imaging module, cell, core sample scale. SEM elemental analysis via EDS reveal difference oxides silver paste used screen printing of finger contacts. This suggests that were printed different compositions possibly firing conditions. One these...
We present a methodology and associated software implementation for estimating the latitude, longitude, tilt, azimuth of fixed-tilt photovoltaic (PV) array from measured power signal. Our major contribution to this line research is developing robust estimation procedure local sunrise sunset time data creating reusable, open-source code implementations. validated proposed algorithms on labeled set comprised fleet more than 4400 inverter measurements at 400 unique sites.
We report on an electrical conduction mechanism for series resistance (Rs) degradation observed in a utility scale solar farm by nm-scale imaging of the local at Ag/Si interface c-Si front metallization. Scanning spreading microscopy revealed that number point or small area contacts decreased degraded cell compared to unaffected cell, demonstrating direct root cause Rs degradation. The shows both morphological and chemical difference screen-printed finger contact which likely caused during...