MPPT (maximum power point tracking) scanning method for photovoltaic arrays

Abstract

Embodiment of the invention discloses a MPPT (maximum power point tracking) scanning method and system for photovoltaic arrays and solves the problems of high energy loss and failure in scanning actual global maximum power points in the prior art. The method includes: determining a scan voltage range; determining local maximum power points so as to determine a first reference point and a turning point; comparing the current of the first reference point to that of the turning point so as to determine whether scanning is performed on the reference point or not; if yes, scanning to determine the local maximum power points so as to determine a next reference point and a next turning point; if not, directly determining the next reference point and the next turning point; if the newly determined reference point has the voltage exceeding the determined scan voltage range, ending the scanning; if the newly determined reference point has the voltage not exceeding the determined scan voltage range, re-comparing the current of the reference point to that the turning point so as to determine whether to scan around the reference point or not, and continuing to execute till the end of scanning according to the previous steps; after scanning, using the maximum on of the local maximum power points as the maximum power point of one photovoltaic array.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a scanning method for maximum power point tracking of a photovoltaic array. Background technique [0002] Photovoltaic array is to combine solar cell components in a certain arrangement to better collect solar energy for power generation and increase power generation. Since the output voltage and output current of the photovoltaic array exhibit strong nonlinearity with the change of sunlight intensity, there is a unique maximum power output point (MPP) for the photovoltaic array in a specific working environment. In practical applications, there are multiple peaks in the output power of the photovoltaic array under shading conditions. In order to obtain more electric energy under the same light intensity, it is necessary to scan the output power of the photovoltaic array to achieve the maximum value of the photovoltaic array. Power point tracking (MPPT), so...

AI Technical Summary

Problems solved by technology

[0017] In view of this, the present invention provides a scanning method for maximum power point tracking of a photovoltaic array, to solve the problems in existing scanning methods that there is much energy loss and the actual global maximum power point cannot be scanned

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