System and method for rapid optimizing of maximum power point of photovoltaic array under shadow condition

Abstract

The invention discloses a system for rapid optimizing of a maximum power point of a photovoltaic array under the shadow condition. The system for the rapid optimizing of the maximum power point of the photovoltaic array under the shadow condition is characterized in that the system comprises a photovoltaic cell set and an MPPT controller. The method for the rapid optimizing of the maximum power point of the photovoltaic array under the shadow condition comprises the steps of (1) preparation of data, (2) initialization of a program, (3) judgment of shadow covering, (4) adjustment of a duty ratio, and (5) searching of a maximum power point. The system and method for the rapid optimizing of the maximum power point of the photovoltaic array under the shadow condition have the advantages that the voltage of a position with the maximum power in the whole area can be found rapidly, the searching speed can be increased, searching accuracy can be improved, and the rapid optimizing of the maximum power point of the photovoltaic array under the shadow condition can be achieved without the need of extra arrangement of components.

Description

(1) Technical field: [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular proposes a system and method for quickly finding the maximum power point of a photovoltaic array under shadow conditions. (2) Background technology: [0002] As an emerging green energy, solar power is being rapidly popularized and applied due to its advantages of inexhaustibility, no pollution, and no geographical restrictions. The solar photovoltaic power generation system uses one or more photovoltaic modules connected in series / parallel to convert solar energy into DC power, and then converts it into various forms of power for loads through power electronic converters. However, photovoltaic arrays are easily affected by shadows (local shadows) produced by surrounding buildings, trees, clouds, and dust on the surface of photovoltaic panels, which changes the output characteristics of photovoltaic arrays. The P-V curve is no longer a simple single-pe...

AI Technical Summary

Problems solved by technology

On the one hand, it will reduce the overall output power of the photovoltaic array, and on the other hand, it will interfere with the maximum power point tracking control, so that the commonly used maximum power tracking (MPPT) algorithms, such as the perturbation and observation method and the admittance incremental method, may be used in In this case, the failure makes the operating point converge to a certain power extreme point instead of the maximum power point, so that the energy of the photovoltaic array is not fully utilized, and the system efficiency will be greatly reduced

The problem of partial shading on the photovoltaic panel is that the performance of the battery is reduced, and it will also cause a mismatch problem.

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