Improvements to the IEC 61853 matrix energy rating methodology, validated with the NREL dataset

IEC 61853[1] calculates energy rating by multiplying matrices of insolation YR (kWh/m
²
) X performance ratio PR
_DC
(P
_MEASURED
/P
_{STC.NAMEPLATE}
/G
_I
) for bins of irradiance G
_I
(0.1-1.1 kW/m
²
) and module temperature TM (10-70C). IEC 61853 specifies a linear interpolation/extrapolation of matrix values, but this can cause errors [2] so an improved matrix fitting methodology has been developed and validated using the NREL measurement dataset from 2016[3], [4]. Two models (1-diode model [5] and Mechanistic Performance Model [2]) have been compared in identifying any imperfect measurements and fitting PR
_DC
matrices which can be done with low residual error. Differences in the performance of PV technologies have been calculated and analysed.