SteadyEye 

Based on real-time all sky images

ABOUT

For the next minutes, for very-short term forecasting need

SteadyEye provides advanced solar irradiance and production forecasts up to 30 minutes ahead. This unique nowcasting product combines on-site sky imagery processing with weather forecast, physical models and artificial intelligence. The product is designed to anticipate solar power ramp events and to guarantee PV production.

SteadyEye solution is tailored for industrial applications such as hybrid energy systems and storage control (i.e. PV-diesel-battery), utility scale PV and CSP plants operations as well as grid management.

Sky and weather conditions above solar power plants are continuously monitored using SW-X all sky imager(s) and predicted locally, improving the accuracy of solar forecasts for the next minutes and anticipating the risks of variability.

Sky imager coverage

Observation of cloud cover with a sky imager

Intrahour GHI forecast for 1 site (France) 

Intrahour GHI forecast for 1 site

Intrahour power forecast for a 3.2MWp PV-Diesel plant (Australia) 

Intrahour power forecast for a 3.2MWp PV-Diesel plant

Sky imager-based cloud forecast above one site in France

Sky imager-based cloud forecast above one site in France

30 min 

Max time horizon  

1440 times a day 

Update frequency  

1 min 

Forecast time-step  

Power, GHI, DNI, DHI, GTI, Temperature 

Available parameters  

Site, Portfolio 

Coverage  

PV, Trackers, Bifacial, CSP 

Technology

API, SFTP or Modbus 

Data Delivery  

P10, P20,… , P80, P90 

Confidence levels  

KEY BENEFITS

OPTIMIZE PV POWER RAMP MANAGEMENT 

Thanks to 1 minute forecast update frequency. 

REDUCE HYBRID PLANT OPERATION COSTS 

By increasing the use of solar energy. 

FACILITATE BALANCING OF POWER GRIDS 

And manage spinning reserves.  

IMPROVE OFF-GRID ENERGY SYSTEM OPERATION 

By fostering balancing of the system.  

CUSTOMERS NEEDS

Particularly suitable for insular networks and hybrid systems. It favors real time management and decision making in order to optimize the alternative energy production methods to implement

Hybrid energy and storage systems

Hybrid power systems and microgrids

Foster solar energy use. Reduce investment and operating costs.

Anticipate the variability of solar energy in an insular environment

Insular system management

 Maximize the use of renewable energies while ensuring grid balancing.

Solar forecasting for distribution system operators

Interconnected grid management

Reduce grid management costs.

Irradiance forecasting for plant operations

Plant operation

Make your solar and wind power plants more profitable. Limit penalties, maximize revenues.

METHODOLOGY

Local cloud information is acquired by one or several ground-based sky imager at a high frequency (up to 15 seconds) (step 1). The combination of these images and local weather measurement information are processed to simulate cloud motion vectors and optical depth to obtain forecasts up to 30 minutes ahead (step 2).


Forecasts are then optimized (step 3), by using production/irradiance observations, to take into account local phenomena, and by leveraging artificial intelligence technologies.



Ready-to-use forecasts, in a customized format, are then disseminated (step 4) through our proprietary web interface, csv files delivered via (S)FTP platforms or API. 

Step 1

DATA ACQUISITION

From Steadysun SW-X series sky imager(s).

Visible images and atmospheric measurements.

Every 30 seconds.

Step 2

MODELING 

Cloud detection, classification and motion prediction.

Accurate estimation of clear sky conditions using real-time aerosols prediction.

Calculation of direct and diffuse irradiance components in cloudy conditions.

PV modeling based on physical models and plant features.

Probabilistic forecasting using physical and statistical approaches.

Step 3

OPTIMIZATION 

Based on historical and/or real-time on-site measurements.

Continuous accuracy improvements using state-of-the-art machine learning techniques.

To take into account local weather phenomena and power plants’ behavior.

Step 4

DELIVERY 

Flexible sending (API, SFTP, etc..).

Customized format (csv, txt, etc.).

Dedicated and secured Steadysun’s web interfaces (visualization, data analytics and warnings).

Forecast performance monitoring.

METHODOLOGY  

Local cloud information is acquired by one or several ground-based sky imager at a high frequency (up to 15 seconds) (step 1). The combination of these images and local weather measurement information are processed to simulate cloud motion vectors and optical depth to obtain forecasts up to 30 minutes ahead (step 2).

Forecasts are then optimized (step 3), by using production/irradiance observations, to take into account local phenomena, and by leveraging artificial intelligence technologies.

Ready-to-use forecasts, in a customized format, are then disseminated (step 4) through our proprietary web interface, csv files delivered via (S)FTP platforms or API. 

Step1 data acquisition
Step 2 modeling
Step 3 optimization
Step 4 delivery

Step 1

Step 2

Step 3

Step 4

DATA ACQUISITION 

MODELING 

OPTIMIZATION 

DELIVERY 

From Steadysun SW-X series sky imager(s).

Visible images and atmospheric measurements.

Every 30 seconds.

Cloud detection, classification and motion prediction.

Accurate estimation of clear sky conditions using real-time aerosols prediction.

Calculation of direct and diffuse irradiance components in cloudy conditions.

PV modeling based on physical models and plant features.

Probabilistic forecasting using physical and statistical approaches.

Based on historical and/or real-time on-site measurements.

Continuous accuracy improvements using state-of-the-art machine learning techniques.

To take into account local weather phenomena and power plants’ behavior.

Flexible sending (API, SFTP, etc..).

Customized format (csv, txt, etc.).

Dedicated and secured Steadysun’s web interfaces (visualization, data analytics and warnings).

Forecast performance monitoring.

Contact us to discuss your projects

OTHER PRODUCTS AND SERVICES

Steadysat, Intraday solar forecasting

Forecasts based on satellite imagery

Reduce penalties & optimize storage management

Manage spinning reserve in real time

Sell energy at the best price on intraday markets

Steadyeye, next minutes solar forecasting

Forecasts from ground based fisheye sky images

Anticipate intra-hour variations of production

Minimize and manage spinning reserve in real time

Reduce genset consumption and increase their lifetime

Solar energy feasability study

Technical and economic studies on renewable energy and electrical systems

Assessment of gains brought by forecasting

Solar resource and yield assessment

Sizing and control of hybrid systems

Development of grid codes

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OFFICE ADDRESS

Savoie Technolac
Bâtiment Hélios
60 avenue du Lac Leman
73370 Le Bourget-du-Lac
France

HEADQUARTERS

QUOS Group
18 Allée du lac Saint André
BP 40328
73382 Le Bourget-du-Lac
CEDEX

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