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A Method for Obtaining Maximum Power Point of Photovoltaic System Based on Multi-objective Optimization

A maximum power point, multi-objective optimization technology, applied in system integration technology, control/regulation system, information technology support system, etc., can solve problems such as poor accuracy, inability to balance tracking accuracy and response speed

Active Publication Date: 2019-06-28
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disturbance step size selected by this type of maximum power point tracking algorithm cannot balance the tracking accuracy and response speed. The larger the disturbance step size, the faster the speed, but the worse the accuracy; and vice versa

Method used

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  • A Method for Obtaining Maximum Power Point of Photovoltaic System Based on Multi-objective Optimization
  • A Method for Obtaining Maximum Power Point of Photovoltaic System Based on Multi-objective Optimization
  • A Method for Obtaining Maximum Power Point of Photovoltaic System Based on Multi-objective Optimization

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Embodiment Construction

[0049] In this embodiment, a method for obtaining the maximum power point of a photovoltaic system based on multi-objective optimization is performed in the following steps:

[0050] Step 1, converting the tracking problem of the maximum power point of the photovoltaic system into a multi-objective optimization problem as shown in formula (1):

[0051]

[0052] In formula (1), V r and I r Respectively represent the voltage and current corresponding to the obtained maximum power point; V max and I max Respectively represent the maximum voltage and maximum current under a given light and temperature; f 1 (x) represents the minimized power function and has:

[0053] f 1 (x)=V max ×I max -V r ×I r (2)

[0054] In formula (1), f 2 (x) represents the current error function and has:

[0055]

[0056] In formula (3), I PV is the photovoltaic current generated by light; I 0 is the diode saturation current; q is the charge of the electron; k is the Boltzmann constan...

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Abstract

The invention discloses a method of acquiring the maximum power point of a photovoltaic system based on multi-objective optimization. The method is characterized by comprising the following steps: 1, the photovoltaic system maximum power point tracking problem is converted into a multi-objective optimization problem shown as in a formula (1); and 2, the multi-objective optimization method is used for optimizing the multi-objective optimization problem to obtain voltage and current corresponding to the maximum power point. The maximum power point of the photovoltaic system in the environment can be acquired by only detecting the external environment, and the purpose of improving the precision of the maximum power point can be achieved.

Description

technical field [0001] The invention relates to the technical field of the maximum power point of a photovoltaic system, in particular to a method for obtaining the maximum power point of a photovoltaic system based on multi-objective optimization. Background technique [0002] There is only one maximum output power point for a photovoltaic power generation system under certain environmental conditions. Once its operating point deviates from the maximum power point, the output power of the solar cell will decrease sharply. Therefore, in order to maximize the use of the energy of the photovoltaic power generation system and improve the efficiency of the system, it is necessary to continuously adjust the operating voltage of the photovoltaic system according to changes in the external environment, so that the photovoltaic power generation system always works near the maximum power point. This technology is called Maximum Power Point Tracking. [0003] With the rapid developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG06Q10/04G06Q50/06Y02E40/70Y04S10/50
Inventor 张兴义程凡蒋小三刘政怡张磊
Owner ANHUI UNIVERSITY