6533b7ddfe1ef96bd1273d07

RESEARCH PRODUCT

PV modules with variable ideality factors

Ole-morten MidtgardGeorgi Hristov YordanovTor Oskar Saetre

subject

Variable (computer science)business.industryControl theoryPhotovoltaic systemIrradianceOptoelectronicsFill factorPower outputIec standardsConstant (mathematics)businessMathematicsVoltage

description

The classical single-exponential I–V curve model for crystalline-Si PV devices assumes a constant ideality factor. The model is widely applied in e.g. modeling the power output of PV systems at different irradiances and temperatures, and also in calculating the Equivalent Cell Temperature (ECT) from the open-circuit voltage. The present paper presents results from several crystalline-Si (c-Si) module types suggesting that the ideality factor may change with irradiance. The possible implications of such variability are discussed, in particular the need for a new ECT calculation procedure as well as for revision of some PV performance models.

yearjournalcountryeditionlanguage
2012-06-012012 38th IEEE Photovoltaic Specialists Conference
https://doi.org/10.1109/pvsc.2012.6318073