System and method of determining maximum power point...

G - Physics – 05 – F

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G05F 1/67 (2006.01) H01L 31/04 (2006.01)

Patent

CA 2742805

A system and method for operating a photovoltaic element at or near a maximum power point. A maximum power point tracker changes a voltage or current set point of a photovoltaic element in sequential discrete steps, measuring an output power at each step after a predetermined settling time. A slope of a power- voltage curve is then estimated and the slope is corrected for irradiance changes. Finally, an operating voltage or current of the photovoltaic element is adjusted based on the slope of the power-voltage curve and other factors, causing the photovoltaic element to operate at or near its maximum power.

La présente invention concerne un système et un procédé de focntionnement d'un élément photovoltaïque à sa puissance maximale ou quasi-maximale. Un module de suivi des points de puissance maximale modifie un point de consigne de tension ou de courant d'un élément photovoltaïque par étapes séquentielles discrètes, mesurant une puissance de sortie à chaque étape après une période de stabilisation prédéterminée. On évalue alors la pente d'une courbe puissance-tension, et on corrige cette pente en fonction des variations d'éclairement énergétique. Finalement, on ajuste une tension ou un courant de fonctionnement de l'élément photovoltaïque en fonction de la pente de la courbe puissance-tension et d'autres facteurs, ce qui amène l'élément photovoltaïque à fonctionner à sa puissance maximale ou quasi-maximale.

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