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Maximum solar energy cell power point method of foldable line fitting

A solar cell and maximum power point technology, which is applied in the fields of adjusting electrical variables, renewable energy integration, instruments, etc., can solve problems such as large errors, and achieve the effects of small calculation amount, high control accuracy, and improved fitting accuracy.

Inactive Publication Date: 2017-03-01
ZHONGZHOU UNIV
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AI Technical Summary

Problems solved by technology

This method uses a straight line to fit the voltage-current relationship at the maximum power point under different illuminations at a known temperature, and the fitted straight line at other temperatures is derived from this straight line. However, the actual characteristic is not a straight line at low irradiance. Therefore, the error is large

Method used

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  • Maximum solar energy cell power point method of foldable line fitting
  • Maximum solar energy cell power point method of foldable line fitting
  • Maximum solar energy cell power point method of foldable line fitting

Examples

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Embodiment 1

[0057] A method for finding the maximum power point of a solar battery by fitting a broken line, comprising the following steps:

[0058] A. Establishment of analysis model:

[0059] The maximum power point reference line of solar cells at different temperatures is not a straight line, and the division point P T The maximum power point reference lines on both sides are respectively denoted by L H and L L Indicates that a straight line is used to fit L H and L L , establish the following mathematical expression model:

[0060]

[0061] Among them, V and I are the output voltage and current of the solar cell respectively, and V mpp is the maximum power point voltage, a, b, c, d are straight line fitting coefficients, a t 、c t , b 0 、d 0 , V PT is a constant at a specific temperature, and T is the temperature;

[0062] B. Mathematical fitting method to solve coefficients:

[0063] B-1. Input the open-circuit voltage, short-circuit current, and temperature coefficie...

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Abstract

The invention discloses a maximum solar energy cell power point method of foldable line fitting, the method comprises the steps of firstly building a math analysis model: (the equation being described in the application), then according to the above equation fitting the lines and calculating to obtain multiple pieces of the maximum power point reference line coefficients under different temperatures, finally respectively measuring the current IOUT, and voltage VOUT outputted by the target solar energy cell, substituting in equation (1) and carrying out calculations and high and low point adjustments till obtaining the maximum power tracing point of the target solar energy cell under different temperatures. The method proposes a relation curve among the many maximum power points under different sun lights using two straight lines to fit the known temperatures, in order to increase the fitting precision under low light irradiance extent condition, can be used to realize the high efficiency open loop control MPPT, and makes it easy to achieve and keeps at low lost.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to an optimization analysis method for photovoltaic solar cells. Background technique [0002] Photovoltaic power generation is more and more widely used in daily production and life. Solar cells are the basic components of photovoltaic power generation. The power generation capacity of solar cells is affected by sunlight irradiance and temperature. The stronger the irradiance, the greater the power generation capacity, and the lower the temperature, the greater the power generation capacity. When the irradiance and temperature are constant, the actual output power of the solar cell is closely related to its output voltage or current. Therefore, when the solar cell is working, it needs to work in a specific voltage or current state, and this state point becomes the maximum power point (MPP) of the solar cell. In actual work, the light irradiance and temperature of the ...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02B10/10
Inventor 孙建延王继东许春香雷钢许海涛杨永友
Owner ZHONGZHOU UNIV
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