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Topological structure capable of realizing photovoltaic array reconstruction and method for solving maximum power point

A technology of maximum power point and photovoltaic array, applied in the direction of instruments, adaptive control, control/regulation system, etc., can solve the problems of unrealized maximum power point solution, falling into local maximum value, failure, etc., to achieve optimized output performance, The effect of enhancing adaptability and reducing power loss

Inactive Publication Date: 2013-10-16
HOHAI UNIV
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Problems solved by technology

At the same time, according to the characteristic curve under partial shading conditions, it can be seen that there are multiple local maxima in the output power. The conventional maximum power point optimization algorithm for photovoltaic arrays may fail under partial shading conditions and fall into local maxima. The maximum power point solution for

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  • Topological structure capable of realizing photovoltaic array reconstruction and method for solving maximum power point
  • Topological structure capable of realizing photovoltaic array reconstruction and method for solving maximum power point
  • Topological structure capable of realizing photovoltaic array reconstruction and method for solving maximum power point

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Embodiment

[0047] A photovoltaic array optimization reconstruction method under partial shadow proposed by the present invention is implemented in the following photovoltaic system:

[0048] Suntech's 50W photovoltaic array parameters are used for modeling and simulation, and the relevant parameters are: P m =170W, V oc =50V,I sc =4A,V m =45V, I m =3.7A, the above parameters are T=25℃, S=1000W / m 2time characteristic parameters.

[0049] exist figure 1 In , the initial PV array is given a uniform light intensity of 1000W / m 2 , and then due to the influence of shading, the light intensity of the module changes, S PV1 = S PV3 =1000W / m 2 , S PV2 = S PV4 =600W / m 2 .

[0050] exist image 3 In , the power conversion curve under the reconstruction of the photovoltaic array is given; among them, the curve 1 is the curve diagram of the series photovoltaic array under the uniform illumination; the curve 2 is the curve diagram of the series photovoltaic array under the non-uniform ill...

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Abstract

The invention discloses a topological structure capable of realizing photovoltaic array reconstruction and a method for solving a maximum power point. In order to increase a capacity of a photovoltaic array for coping with complex environmental changes, the method comprises the steps of first building a model capable of realizing photovoltaic array reconstruction under partial shadow; then solving a global maximum power point under various topological structures through an improved drosophila algorithm, and selecting a model corresponding to the maximum output power as an optimization topological structure; and finally determining a photovoltaic array topological structure meeting constraint conditions by giving consideration to requirements of an actual working condition. Through the algorithm design disclosed by the invention, the output power of the photovoltaic array under partial shadow can be increased, and requirements of various different working conditions can be met at the same time.

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] In the photovoltaic power generation system, it is easy to be affected by shading caused by floating clouds, buildings, trees, etc. The shading phenomenon will bring many problems to the photovoltaic system, such as a sharp decrease in output power, hot spot effect, failure of maximum power point optimization technology, etc. The output voltage of photovoltaic modules is only tens of volts, and the output power is only hundreds of watts. Usually, series and parallel combinations are required to meet the actual voltage and power level requirements, which intensifies the impact of shading. Therefore, how to weaken the shading effect has become a hot research topic in photovoltaic power generation...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 韩伟王宏华
Owner HOHAI UNIV
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