Monitoring system for solar radiation measurements in photovoltaic parks
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Abstract
The majority of photovoltaic parks installed in the national territory have means of recording and reporting, along with electricity generation, several meteorological variables that influence their performance, in particular, solar radiation, which is measured with pyranometers. These instruments may present variations in their calibration constants after prolonged use, and require a monitoring scheme and periodic calibrations. Below is a preliminary validation method for solar radiation data in photovoltaic parks, which can indicate in which parks erroneous solar radiation values are being reported. The method compares the hourly values reported each day in each park with those estimated by the WRF numerical forecast model and on days where the correlation between both series is greater than 0.985, it then calculates the relationship between the sums of each series. If the value of this ratio is close to 1, it can be considered that the pyranometer of that park is working correctly. The results of the evaluation of solar radiation reports in a set of photovoltaic parks connected to the national electrical grid are presented.
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