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Title: Solar Irradiance Nowcasting Case Studies near Sacramento

Journal Article · · Journal of Applied Meteorology and Climatology
 [1];  [2];  [2];  [3];  [3];  [1]
  1. National Center for Atmospheric Research, Boulder, CO (United States). Research Applications Lab.
  2. National Center for Atmospheric Research, Boulder, CO (United States)
  3. Colorado State Univ., Fort Collins, CO (United States). Cooperative Inst. for Research in the Atmosphere

The Sun4Cast solar power forecasting system, designed to predict solar irradiance and power generation at solar farms, is composed of several component models operating on both the nowcasting (0–6 h) and day-ahead forecast horizons. The different nowcasting models include a statistical forecasting model (StatCast), two satellite-based forecasting models [the Cooperative Institute for Research in the Atmosphere Nowcast (CIRACast) and the Multisensor Advection-Diffusion Nowcast (MADCast)], and a numerical weather prediction model (WRF-Solar). It is important to better understand and assess the strengths and weaknesses of these short-range models to facilitate further improvements. To that end, each of these models, including four WRF-Solar configurations, was evaluated for four case days in April 2014. For each model, the 15-min average predicted global horizontal irradiance (GHI) was compared with GHI observations from a network of seven pyranometers operated by the Sacramento Municipal Utility District (SMUD) in California. Each case day represents a canonical sky-cover regime for the SMUD region and thus represents different modeling challenges. The analysis found that each of the nowcasting models perform better or worse for particular lead times and weather situations. StatCast performs best in clear skies and for 0–1-h forecasts; CIRACast and MADCast perform reasonably well when cloud fields are not rapidly growing or dissipating; and WRF-Solar, when configured with a high-spatial-resolution aerosol climatology and a shallow cumulus parameterization, generally performs well in all situations. Further research is needed to develop an optimal dynamic blending technique that provides a single best forecast to energy utility operators.

Research Organization:
University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0006016
OSTI ID:
1536981
Journal Information:
Journal of Applied Meteorology and Climatology, Vol. 56, Issue 1; ISSN 1558-8424
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

References (42)

Introducing subgrid‐scale cloud feedbacks to radiation for regional meteorological and climate modeling journal December 2012
An analog ensemble for short-term probabilistic solar power forecast journal November 2015
Macroscopic cloud properties in the WRF NWP model: An assessment using sky camera and ceilometer data journal October 2015
Multivariate Minimum Residual Method for Cloud Retrieval. Part I: Theoretical Aspects and Simulated Observation Experiments journal December 2014
Multivariate Minimum Residual Method for Cloud Retrieval. Part II: Real Observations Experiments journal December 2014
A North American Hourly Assimilation and Model Forecast Cycle: The Rapid Refresh journal April 2016
Evaluation of the surface PM2.5 in Version 1 of the NASA MERRA Aerosol Reanalysis over the United States journal January 2016
Intra-hour forecasting with a total sky imager at the UC San Diego solar energy testbed journal November 2011
Evaluating the Performance of Planetary Boundary Layer and Cloud Microphysical Parameterization Schemes in Convection-Permitting Ensemble Forecasts Using Synthetic GOES-13 Satellite Observations journal January 2014
Kalman Filter and Analog Schemes to Postprocess Numerical Weather Predictions journal November 2011
Probabilistic Weather Prediction with an Analog Ensemble journal October 2013
Multi-sensor Advection Diffusion nowCast (MADCast) for cloud analysis and short-term prediction text January 2014
Review of solar irradiance forecasting methods and a proposition for small-scale insular grids journal November 2013
Big Data and Machine Learning for Applied Weather Forecasts: Forecasting Solar Power for Utility Operations conference December 2015
Variable Generation Power Forecasting as a Big Data Problem journal April 2017
The Sun4Cast® Solar Power Forecasting System: The Result of the Public-Private-Academic Partnership to Advance Solar Power Forecasting text January 2016
The Pathfinder Atmospheres–Extended AVHRR Climate Dataset journal June 2014
Cloud motion estimation for short term solar irradiation prediction conference October 2013
Solar forecasting methods for renewable energy integration journal December 2013
WRF-Solar: Description and Clear-Sky Assessment of an Augmented NWP Model for Solar Power Prediction journal July 2016
The Role of Unresolved Clouds on Short-Range Global Horizontal Irradiance Predictability journal September 2016
Introduction of the GSI into the NCEP Global Data Assimilation System journal December 2009
Evaluation of the WRF model solar irradiance forecasts in Andalusia (southern Spain) journal August 2012
Comparison of summer and winter California central valley aerosol distributions from lidar and MODIS measurements journal November 2010
Future cost-competitive electricity systems and their impact on US CO2 emissions journal January 2016
A Wind Power Forecasting System to Optimize Grid Integration journal October 2012
Forecasting the Wind to Reach Significant Penetration Levels of Wind Energy journal September 2011
Evaluation of numerical weather prediction for intra-day solar forecasting in the continental United States journal May 2011
A model tree approach to forecasting solar irradiance variability journal October 2015
A regime-dependent artificial neural network technique for short-range solar irradiance forecasting journal April 2016
Regime-Dependent Short-Range Solar Irradiance Forecasting journal July 2016
3D cloud detection and tracking system for solar forecast using multiple sky imagers journal August 2015
Validation of short and medium term operational solar radiation forecasts in the US journal December 2010
Comparison of numerical weather prediction solar irradiance forecasts in the US, Canada and Europe journal August 2013
Simplifying decision trees journal September 1987
Improved Use of Continuous Attributes in C4.5 journal January 1996
MERRA: NASA’s Modern-Era Retrospective Analysis for Research and Applications journal July 2011
A simple parameterization of the short-wave aerosol optical properties for surface direct and diffuse irradiances assessment in a numerical weather model journal January 2014
A Description of the Advanced Research WRF Version 3 text January 2008
Contribution of different aerosol species to the global aerosol extinction optical thickness: Estimates from model results journal October 1997
Solar Forecasting: Methods, Challenges, and Performance journal November 2015
Development of a sky imaging system for short-term solar power forecasting journal January 2015

Cited By (1)

Assessment of Simulated Solar Irradiance on Days of High Intermittency Using WRF-Solar journal January 2020