Abstract
Partial shading cause significant losses to the performance of a photovoltaic (PV) system. So, it is imperative to study effects of partial shading; for that a two-diode model of the experimental setup made. Upon verifying the model with the experimental parameters, a MATLAB/Simulink model is made based on this model. Various shading patterns, the effect of bypass diodes; the effect of overlapping bypass diode is studied on this MATLAB/Simulink model. It is found out that the reduction in power loss is depended on the location of the shaded cell but not the area of the shaded cell. Also, the over-lapping bypass diode configuration has a slight improvement in the PV performance compared to the non-overlapping bypass diode configuration. An experimental test is also conducted by applying different shading pattern and they proves the results are compatible with the simulated results.
Highlights
Most of the present photovoltaic system's efficiency can be increased by the proper optimization
The two-diode model based on the real-world system is made and validated by comparing it to the experimental values
The simulations for partial shading is conducted based on the two-diode model
Summary
Most of the present photovoltaic system's efficiency can be increased by the proper optimization. In a single diode method, the effect of recombination is neglected which happens in the depletion region [2]. In a two-diode model this effect is considered with the help of the second diode. Each of the cells in a module is connected in series, the power output from the module will be depended on the level of current passing through the weakest cell. This is one of the characteristics of series the connection. A module without a bypass diode will have greater power loss under shaded the condition when it is compared to a module which has a bypass diode [8]
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