Girasol, a sky imaging and global solar irradiance dataset

The energy available in Micro Grid (MG) that is powered by solar energy is
tightly related to the weather conditions in the moment of generation.
Very short-term forecast of solar irradiance provides the MG with the
capability of automatically controlling the dispatch of energy. We propose
to achieve this using a data acquisition systems (DAQ) that simultaneously
records sky imaging and Global Solar Irradiance (GSI) measurements, with
the objective of extracting features from clouds and use them to forecast
the power produced by a Photovoltaic (PV) system. The DAQ system is
nicknamed as the Girasol Machine (Girasol means Sunflower in
Spanish). The sky imaging system consists of a longwave infrared (IR)
camera and a visible (VI) light camera with a fisheye lens attached to it.
The cameras are installed inside a weatherproof enclosure that it is
mounted on an outdoor tracker. The tracker updates its pan an tilt every
second using a solar position algorithm to maintain the Sun in the center
of the IR and VI images. A pyranometer is situated on a horizontal support
next to the DAQ system to measure GSI. The dataset, composed of IR images,
VI images, GSI measurements, and the Sun's positions, has been tagged
with timestamps.