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A 600W solar plant consisting of two 300W solar panel connected in parallel as shown in figure 3.22. One of the panels is considered partially shaded by reducing the irradiance value from 1000W/đť‘š2 to 500W/đť‘š2 and the solar plant connected to a load of 10Ω.The power drawn by the load during partial shading condition is shown in figure 3.23 and it is constant around 146WÂ
Figure 3.22 – Partial shading without mpptÂ
Fig 3.23 – Pwr extracted during partial shadingÂ
In order to improve the power extraction from the system during partial shading condition, a modified P&O mppt controlled boost converter is connected in between solar plant and the load as shown in figure 3.24.The mppt algorithm used in the model is a modified version of perturb and observe algorithm and the flowchart of the algorithm is shown in figure 3.25.
Figure 3.24 – Partial shading with modified p&o mpptÂ
Figure 3.25 – Flow chart of modified p&o mpptÂ
The power drawn by the load during partial shading condition with modified p&o mppt algorithm is shown in figure 3.26.The average power drawn by the load during partial shading condition with modified p&o mppt algorithm is around 160W. From the result it is observed that the modified p&o mppt algorithm takes longer computation time to extract maximum power during partial shading condition. Further the response can be improved by using advanced soft computing algorithm during partial shading condition. The comparison between with mppt and without mppt is shown in table 3.4.
Figure 3.26 – Power extracted during partial shading with modified p&o mpptÂ
Table 3.4 – Comparison between with and without mpptÂ
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