A Direct Maximum Power Point Tracking Method for Single-Phase Grid Connected PV Inverters

ABSTRACT:

A direct maximum power point tracking (MP PT) strategy for P V frameworks has been proposed in this work. This strategy unravels two of the primary disadvantages of the Perturb and Observe (P&O) MP PT, in particular: I) the trade off between the speed and the motions in relentless state, ii) the poor viability in unique conditions, particularly in low i r radiance when the estimation of signs turns out to be progressively touchy to clamor.

MP PT

The proposed MP PT is intended for single-stage single-arrange matrix associated P V invert er s and depends on evaluating the swell of the quick P V power and voltage, utilizing a second-arrange summed up integrator-based quadrature flag generator (SO G I-Q S G). We broke down the worldwide soundness of the shut circle control framework and approved the proposed calculation through reenactment and analyses on an invert er test stage as per the EN 50530 standard. The test results affirm the execution of the proposed technique as far as both speed and following effectiveness.

 BLOCK DIAGRAM:

Fig. 1. System configuration of single-stage single-phase grid-connected P V system.

EXPECTED SIMULATION RESULTS:

 

Fig. 2. Experimental P V voltage wave forms after startup showing the convergence to MP P with different 𝐾 values.

 

Fig. 3. Start wave forms comparison for DC link voltage.

Fig. 4. The output P V power under trapezoidal i r radiance profile.

Fig. 5. DC link voltage under trapezoidal i r radiance profile

Fig. 6. Instantaneous efficiency under trapezoidal i r radiance profile.

Fig. 7. Experimental start wave forms of P V power for both methods.

Fig. 8. Experimental start wave forms comparison of DC link voltage.

Fig. 9. Experimental results of P V power under trapezoidal i r radiance profile.

Fig. 10. Experimental results for DC link voltage under trapezoidal i r radiance profile.

Fig. 11. Efficiency under static i r radiance for both methods.

Fig. 12. P V power for P&O under dynamic i r radiance profile according to EN 50530.

Fig. 13. P V power for the proposed method under dynamic i r radiance profile according to EN 50503.

Fig. 14. Efficiency comparison for the both methods from low-to-medium i r radiance

Fig. 15. Efficiency comparison for the both methods from medium-to-high i r radiance.

CONCLUSION:

This paper has depicted the structure of a successful controller for direct achieving the most extreme power point for a solitary stage single-stage lattice associated P V invert er. The proposed technique has been structured dependent on the steadiness examination utilizing the L y a p u n o v quadratic capacity that is framed from the variety of vitality put away in the DC connect capacitor. From the reproductions and trial results on a propelled test stage and as indicated by the EN 50530 standard, it was affirmed that the proposed technique accomplishes high productivity in both static and dynamic conditions. Moreover, the proposed strategy is quick to achieve the MP P.

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