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Investigating methods to improve photovoltaic thermal models at second-to-minute timescales
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  • Bert Herteleer,
  • Anastasios Kladas,
  • Gofran Chowdhury,
  • Francky Catthoor,
  • Jan Cappelle
Bert Herteleer
Katholieke Universiteit Leuven

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Anastasios Kladas
Katholieke Universiteit Leuven
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Gofran Chowdhury
Katholieke Universiteit Leuven
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Francky Catthoor
Katholieke Universiteit Leuven
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Jan Cappelle
Katholieke Universiteit Leuven
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Abstract

This paper presents a range of methods to improve the accuracy of equation-based thermal models of PV modules at second-to-minute timescales. We present an RC-equivalent conceptual model for PV modules, where wind effects are captured. We show how the thermal time constant τ of PV modules can be determined from measured data, and subsequently used to make static thermal models dynamic by applying the Exponential Weighted Mean (EWM) approach to irradiance and wind signals. On average, τ is (6 .3±1 .0) min for fixed-mount PV systems. Based on this conceptual model, the Filter- EWM - Mean Bias Error correction (FEM) methodology is developed. We propose two thermal models, WM1 and WM2, and compare these against the models of Ross, Sandia, and Faiman on twenty-four datasets of fifteen sites, with time resolutions ranging from 1s to 1h, the majority of these at 1 min resolution. The FEM methodology is shown to reduce model errors (RMSE and MAE) on average for all sites and models versus the standard steady-state equivalent by −1 .1K and −0 .75K respectively.