Method for quickly optimizing overall maximum power point of photovoltaic array under local shadow

A maximum power point, photovoltaic array technology, applied in photovoltaic power generation, instruments, adjusting electrical variables, etc., can solve problems such as output power mismatch, photovoltaic power generation system output power drop, safety problems, etc., to achieve rapid optimization and prevent falling into Local maximum point, the effect of enhancing rapid adaptability

Inactive Publication Date: 2013-09-25
HOHAI UNIV
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Problems solved by technology

[0002] Partial shading is common in photovoltaic grid-connected power generation systems, which will reduce the output power of photovoltaic power generation systems, and in severe cases will cause "hot spot" effects and cause safety problems
At the same time, in the case of local shading, due to the difference in light intensity and temperature, the output characteristics of the photovoltaic array will present multiple peak points, so that the conventional maximum power point optimization algorithm is very likely to fall into a certain local maximum power value , instead of the real maximum power point, causing output power mismatch

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  • Method for quickly optimizing overall maximum power point of photovoltaic array under local shadow
  • Method for quickly optimizing overall maximum power point of photovoltaic array under local shadow
  • Method for quickly optimizing overall maximum power point of photovoltaic array under local shadow

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[0038] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0039] Under different light intensity and temperature, the output of photovoltaic array presents different U-I and U-P characteristic curves. The photovoltaic arrays connected in series have the same current flow; the photovoltaic arrays connected in parallel have the same terminal voltage. When partial shading occurs, the overall U-P characteristic curve of the photovoltaic array presents multiple extreme points, such as image 3 , Figure 4 , Figure 5 As shown, th...

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Abstract

The invention discloses a method for quickly optimizing an overall maximum power point of a photovoltaic array under local shadow. Under the local overshadowing condition, output characteristics of the photovoltaic array present multiple peak points. For searching an overall maximum value, the method comprises the steps of adopting a modified fruit fly algorithm to perform overall range searching, confirming a range where maximum power is located, then finding a maximum power point in a sub-region in a confirmed region by improving a golden section method and using the maximum power point as a working point of the whole photovoltaic array. By adopting the two steps, the overall maximum power point of the photovoltaic array can be quickly optimized.

Description

technical field [0001] The invention belongs to the field of optimal control and optimization method research, and is specifically applied in a photovoltaic power generation system to solve the method for outputting maximum power under shadow conditions. Background technique [0002] Partial shading is common in photovoltaic grid-connected power generation systems, which will reduce the output power of photovoltaic power generation systems, and in severe cases will cause "hot spot" effects and cause safety problems. At the same time, in the case of local shading, due to the difference in light intensity and temperature, the output characteristics of the photovoltaic array will present multiple peak points, so that the conventional maximum power point optimization algorithm is very likely to fall into a certain local maximum power value , rather than the true maximum power point, causing output power mismatch. [0003] The combination of the global search of the modified fru...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 韩伟王宏华
Owner HOHAI UNIV
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