Modelling and simulation of photovoltaic arrays under partial shading conditions

Naeem Khawaja, Hassan (2013) Modelling and simulation of photovoltaic arrays under partial shading conditions. Masters by Research thesis (MSc), Manchester Metropolitan University.

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Abstract

The work presented in this thesis describes the development of a computer-aided design (CAD) package for photovoltaic (PV) arrays. The CAD package, which is based on the MATLAB software, has been specifically developed to investigate the performance of, and obtain the characteristics of a two-dimensional PV array under partial shading conditions. Partial shading is an important phenomenon in PV systems as it can lead to multiplicity of maximum power points (MPP) and complex terminal characteristics, which complicates the requirements placed on the maximum power point tracking (MPPT) algorithm. It is therefore, important that the effects of partial shading, and indeed temperature, on the characteristics of a PV array are studied. The CAD package developed in this work was tested for characterising a PV panel against the manufacturers’ data sheets. The effects of partial shading on the characteristics of PV arrays were investigated for a variety of conditions with particular reference to the complexities partial shading has on the maximum power tracking strategies. The tests concluded that partial shading and varying temperatures resulted in reduced outputs and power losses, thereby affecting the performance of the PV array. The package, which is based on the two-diode model of a PV module, provides a convenient tool for the PV designer and/or a trainee.