ADJUSTABLE RESISTANCE FEEDBACK PIECEWISE LINEAR INTERPOLATION PHOTOVOLTAIC EMULATOR
DOI:
https://doi.org/10.11113/jurnalteknologi.v86.21720Keywords:
Photovoltaic model, piecewise linear interpolation, linear regression, buck converter, PI controllerAbstract
Photovoltaic (PV) emulator (PVE) is a power converter that follows the voltage and current characteristic of a PV module. The direct referencing method (DRM) is the prevailing control strategy for the PVE because of its straightforward nature. Nonetheless, stability is an issue for this control strategy. The resistance feedback method (RFM) provides an alternative solution without encountering stability issues. The RFM requires a specialize current-resistance (I-R) PV model to operate. Currently, the adjustable piecewise linear interpolation (PLI) for this specialize PV model is unavailable for the RFM PVE. This paper proposed an adjustable I-R PLI (IRPLI) PV model for the PVE that uses the RFM control strategy. The performance of this PV model and its corresponding RFM PVE is compared with the current-voltage PLI (IVPLI) PV model together with the DRM PVE. The output of the IRPLI is similar to the IVPLI at various irradiance. The discrepancy in error for both PV models is a maximum of 6% when compared to the standard single diode model (SDM) PV model. The IRPLI is 3.2 times faster compared to the SDM and 1.07 times slower compared to the IVPLI. The IRPLI also able to properly integrated with the RFM PVM without any stability issues.
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