Simplified modeling for partially shaded PV systems

A proposed two-diode model is based exclusively on the standard test condition parameters of solar modules and their irradiance levels. The analytical tool reportedly enables PV system operators to estimate the I-V curves of a shaded array quickly and accurately.

Researchers claim to have developed a two-diode model to calculate the I-V curve of partially shaded solar arrays which they say can be applied to any series-parallel string configuration.

Scientists from the University of Malaya, the University of Southampton Malaysia, the Universiti Teknologi Malaysia and Australia’s Swinburne University of Technology have presented their model in the study A fast and accurate generalized analytical approach for PV arrays modeling under partial shading conditions, published in Solar Energy and on the ScienceDirect website.

The academics say their model – which requires only standard test condition parameters for the panels involved and their irradiance levels – can be used to calculate the I–V characteristics of each module and string. “Then, these curves are manipulated to compute the curve of the whole PV array,” the researchers stated.

The two-diode approach is said to incorporate the effect of the blocking and bypass diodes, improving prediction accuracy.

The Malay-Australian group said the analytical equations at the core of their model are fast and can be coded on any development platform. The model, which can be used in a PV-related computer-aided design tool and in commercial PV simulators, is also said to be able to create critical shading patterns for maximum power point tracking (MPPT) algorithm evaluation.

“The proposed analytical approach is swift and can get the results [in] around one-tenth of the time needed by the Simulink model to complete the simulation run,” the researchers said.

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