Search Results - "Hansen, Clifford"

Identification of periods of clear sky irradiance in time series of GHI measurements by Reno, Matthew J., Hansen, Clifford W.

“…We present a simple algorithm for identifying periods of time with broadband global horizontal irradiance (GHI) similar to that occurring during clear sky…”
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A robust I–V curve correction procedure for degraded photovoltaic modules by Li, Baojie, Hansen, Clifford W., Chen, Xin, Diallo, Demba, Migan-Dubois, Anne, Delpha, Claude, Jain, Anubhav

“…To enable health monitoring and fault diagnosis of PV modules using current-voltage characteristics (I–V curves), it is generally necessary to correct the I–V…”
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Modeling the Irradiance and Temperature Dependence of Photovoltaic Modules in PVsyst by Sauer, Kenneth J., Roessler, Thomas, Hansen, Clifford W.

“…In order to reliably simulate the energy yield of photovoltaic (PV) systems, it is necessary to have an accurate model of how the PV modules perform with…”
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PVLIB: Open source photovoltaic performance modeling functions for Matlab and Python by Stein, Joshua S., Holmgren, William F., Forbess, Jessica, Hansen, Clifford W.

“…PVLIB is a set of open source modeling functions that allow users to simulate most aspects of PV system performance. The functions, in Matlab and Python, are…”
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Single Diode Parameter Extraction from In-Field Photovoltaic I-V Curves on a Single Board Computer by Jones, C. Birk, Hansen, Clifford. W.

“…In this paper, we present a new, light-weight approach for extracting the five single diode parameters (I L , I o , R S , R SH , and nN s V t ) for advanced,…”
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Uncertainty in Annual Energy Resulting from Uncertain Irradiance Measurements by Hansen, Clifford W., Scheiner, Aaron

“…We report an analysis quantifying the contribution to uncertainty in annual energy projections from uncertainty in ground-measured irradiance. Uncertainty in…”
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Determining Series Resistance for Equivalent Circuit Models of a PV Module by Hansen, Clifford W., King, Bruce H.

“…Literature describes various methods for determining a series resistance for a photovoltaic device from measured IV curves. We investigate use of these…”
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State Estimation-Based Distributed Energy Resource Optimization for Distribution Voltage Regulation in Telemetry-Sparse Environments Using a Real-Time Digital Twin by Darbali-Zamora, Rachid, Johnson, Jay, Summers, Adam, Jones, C. Birk, Hansen, Clifford, Showalter, Chad

“…Real-time state estimation using a digital twin can overcome the lack of in-field measurements inside an electric feeder to optimize grid services provided by…”
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Benchmark Tests for IV Fitting Algorithms by Hansen, Clifford W., Jones, Abigail R., Transue, Taos, Theristis, Marios

“…We propose a set of benchmark tests for current-voltage (IV) curve fitting algorithms. Benchmark tests enable transparent and repeatable comparisons among…”
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Orange Button: Accelerating the Digital Transformation of Distributed Energy by Hansen, Clifford W., Rippingale, Jan, Transue, Taos, Court, Philip, Gorman, John

“…Data processing adds substantial soft costs to distributed energy systems. These costs are incurred primarily as labor necessary to collect, normalize, store…”
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Clear-Sky Detection Using Time-Averaged, Tilted-Plane Data by Hansen, Clifford W., Jordan, Dirk C.

“…A method is presented to detect clear-sky periods for plane-of-array, time-averaged irradiance data that is based on the algorithm originally described by Reno…”
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A Comparison of DER Voltage Regulation Technologies Using Real-Time Simulations by Summers, Adam, Johnson, Jay, Darbali-Zamora, Rachid, Hansen, Clifford, Anandan, Jithendar, Showalter, Chad

“…Grid operators are now considering using distributed energy resources (DERs) to provide distribution voltage regulation rather than installing costly voltage…”
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Measuring Irradiance for Bifacial PV Systems by Gostein, Michael, Pelaez, Silvana Ayala, Deline, Chris, Habte, Aron, Hansen, Clifford W., Marion, Bill, Newmiller, Jeff, Sengupta, Manajit, Stein, Joshua S., Suez, Itai

“…The advent of bifacial PV systems drives new requirements for irradiance measurement at PV projects for monitoring and assessment purposes. While there are…”
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The Solar Forecast Arbiter: An Open Source Evaluation Framework for Solar Forecasting by Hansen, Clifford W., Holmgren, William F., Tuohy, Aidan, Sharp, Justin, Lorenzo, Antonio T., Boeman, Leland J., Golnas, Anastasios

“…We describe an open source evaluation framework for solar forecasting to support the DOE Solar Forecasting 2 program and the broader solar forecast community…”
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Use of replicated Latin hypercube sampling to estimate sampling variance in uncertainty and sensitivity analysis results for the geologic disposal of radioactive waste by Hansen, Clifford W., Helton, Jon C., Sallaberry, Cédric J.

“…The 2008 performance assessment (PA) for the proposed repository for high-level radioactive waste at Yucca Mountain (YM), Nevada, used a Latin hypercube sample…”
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Estimation of parameters for single diode models using measured IV curves by Hansen, Clifford W.

“…Many popular models for photovoltaic system performance (e.g., [1], [2]) employ a single diode model (e.g., [3]) to compute the IV curve for a module or string…”
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Uncertainty and sensitivity analysis in performance assessment for the proposed high-level radioactive waste repository at Yucca Mountain, Nevada by Helton, Jon C., Hansen, Clifford W., Sallaberry, Cédric J.

“…Extensive work has been carried out by the U.S. Department of Energy (DOE) in the development of a proposed geologic repository at Yucca Mountain (YM), Nevada,…”
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Analysis of irradiance models for bifacial PV modules by Hansen, Clifford W., Stein, Joshua S., Deline, Chris, MacAlpine, Sara, Marion, Bill, Asgharzadeh, Amir, Toor, Fatima

“…We describe and compare two methods for modeling irradiance on the back surface of rack-mounted bifacial PV modules: view factor models and ray-tracing…”
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A Detailed Model of Rear-Side Irradiance for Bifacial PV Modules by Hansen, Clifford W., Gooding, Renee, Guay, Nathan, Riley, Daniel M., Kallickal, Johnson, Ellibee, Donald, Asgharzadeh, Amir, Marion, Bill, Toor, Fatima, Stein, Joshua S.

“…We describe and validate a method for modeling irradiance on the back surface of bifacial PV modules at the scale of individual cells using view factors. We…”
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pvlib python: a python package for modeling solar energy systems by Holmgren, William F., Hansen, Clifford W., Mikofski, Mark A.

“…pvlib python is a community-supported open source tool that provides a set of functions and classes for simulating the performance of photovoltaic energy…”
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