Variable step size disturbance maximum power point tracking method based on power forecating

A technology of maximum power point and variable step size disturbance, which is applied in the direction of adjusting electrical variables, photovoltaic power generation, instruments, etc., to achieve the effect of overcoming misjudgment and tracking failure problems, and overcoming misjudgment

Inactive Publication Date: 2013-04-17
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method can overcome the problems of misjudgment and tracking failure when the external environment changes greatly, and can effectively solve the contradiction between the maximum power tracking speed and accuracy, quickly track to the maximum power point, and ensure that the actual voltage follows the environment after the change. The theoretical maximum power point voltage of

Method used

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  • Variable step size disturbance maximum power point tracking method based on power forecating
  • Variable step size disturbance maximum power point tracking method based on power forecating
  • Variable step size disturbance maximum power point tracking method based on power forecating

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Embodiment Construction

[0026] The specific implementation process of the present invention is described in detail as follows:

[0027] figure 2 It is a flowchart of the method of the present invention. Measure the output voltage U(k) and current I(k) of the photovoltaic cell module, and calculate the power P(k). After half a sampling period, measure the output voltage U(k+1 / 2) and current I(k+1 / 2) of the photovoltaic cell module, and calculate the power P(k+1 / 2) and P’(k). By comparing P(k) and P'(k-1) to determine the position of the current operating point and the maximum power point, if P(k)–P'(k-1)>0, the current operating point is at the maximum power point left side; if P(k)–P'(k-1)<0, the current working point is on the right side of the maximum power point; if P(k)=P'(k-1), it means that the current working point is is the maximum power point, and no disturbance control is performed this time.

[0028] Compare the current voltage detection value U(k) with the previous voltage detection ...

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Abstract

The invention discloses a variable step size disturbance maximum power point tracking method based on power forecasting. The control method combines a power forecasting method and a variable step size method, leads the voltage value of the theoretical maximum power point of a photovoltaic cell at the current time into a modulating pulse generation process to perform maximum power tracking of the photovoltaic cell through dual-functions of the two methods. By means of the control method, the problem of erroneous judgment and tracking failure when the external environment changes remarkably can be solved, the contradiction existing between the maximum power tracking speed and accuracy can be effectively solved, the maximum power point can be tracked fast, and the theoretical maximum power point voltage can be ensured when the actual working pressure changes along with the environment factors.

Description

technical field [0001] The invention relates to photovoltaic technology, in particular to the technical field of maximum power point tracking of photovoltaic cells. Background technique [0002] Solar energy is a green and renewable energy source, rich in resources and widely distributed. Rational use of photovoltaic power generation can effectively alleviate the current world energy crisis, reduce the use of non-renewable energy, and protect the environment. Since solar photovoltaic power generation is not restricted by energy resources, raw materials and application environment, it has the broadest development prospects and is one of the most developed renewable energy technologies in various countries. In a photovoltaic power generation system, the utilization rate of photovoltaic cells is not only related to the internal characteristics of photovoltaic cells, but also affected by factors such as the intensity of incoming light in the external environment, load and temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 陆文婷陈维荣李奇
Owner SOUTHWEST JIAOTONG UNIV
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