Intelligent trend analysis for a solar thermal energy collector field

Solar thermal power plants collect available solar energy in a usable form at a temperature range which is adapted to the irradiation levels and seasonal variations. Solar energy can be collected only when the irradiation is high enough to produce the required temperatures. During the operation, a t...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2018-03, Vol.136 (1), p.12007
Main Author: Juuso, E K
Format: Article
Language:English
Subjects:
Energy
Irradiation
Mathematical analysis
Power plants
Radiation
Seasonal variations
Solar energy
Solar heating
Solar power
Temperature requirements
Thermal energy
Thermal power
Thermal power plants
Trend analysis
Windows (intervals)
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Summary:Solar thermal power plants collect available solar energy in a usable form at a temperature range which is adapted to the irradiation levels and seasonal variations. Solar energy can be collected only when the irradiation is high enough to produce the required temperatures. During the operation, a trade-off of the temperature and the flow is needed to achieve a good level for the collected power. The scaling approach brings temporal analysis to all measurements and features: trend indices are calculated by comparing the averages in the long and short time windows, a weighted sum of the trend index and its derivative detects the trend episodes and severity of the trend is estimated by including also the variable level in the sum. The trend index, trend episodes and especially, the deviation index reveal early evolving changes in the operating conditions, including cloudiness and load disturbances. The solution is highly compact: all variables, features and indices are transformed to the range [-2, 2] and represented in natural language which is important in integrating data-driven solutions with domain expertise. The special situations detected during the test campaigns are explained well.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/136/1/012007