A mppt method based on temperature and light intensity feedback

A photovoltaic square array and look-up table technology, which is applied in photovoltaic power generation, instruments, and electric variable adjustment, can solve the problems of high cost and low efficiency of the controller, and achieve the effects of fast tracking speed, simple algorithm, and fewer circuit components

Inactive Publication Date: 2017-01-25
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention provides an MPPT method based on temperature and light intensity feedback, which can solve the disadvantages of high cost and low efficiency of existing controllers

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  • A mppt method based on temperature and light intensity feedback
  • A mppt method based on temperature and light intensity feedback
  • A mppt method based on temperature and light intensity feedback

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[0024] 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.

[0025] Such as figure 2 As shown, in the case of constant temperature, as the intensity of the sun changes, the maximum power points under different light intensities in the figure correspond to the same voltage, which is the constant voltage method (CVT) widely used in the MPPT field; this The method is simple in control, good in reliability, and easy to implement, but it ignores the effect of temperature on the open circuit voltage U oc and the maximum power point vo...

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Abstract

The invention discloses an MPPT method based on temperature and light intensity feedback. A device in the method comprises an open-circuit voltage sampling circuit, a temperature and light intensity sampling circuit, a BUCK circuit, a drive circuit and an MCU controller; the method comprises the steps that a k value needed by a photovoltaic array is obtained through experimental tests; the MCU controller collects the temperature and the light intensity of the external environment respectively through the temperature and light intensity sampling circuit, collected results are fed back into the MCU controller, and a needed k value is obtained by executing a table look-up method; a maximum power point voltage is calculated according to a maximum power point voltage formula, and the duty ratio of the control circuit is adjusted in real time; sampling is conducted every ten minutes, the table look-up method is executed again till the k values obtained in the two adjacent times are equal, and a maximum power point of a solar panel is finally obtained. According to the MPPT method based on the temperature and light intensity feedback, real-time voltage and current detection does not needed, circuit elements are few, power consumption is small, the algorithm is simple, the tracking velocity is high, the MPPT method is suitable for a photovoltaic power generation system of a small power occasion, and development of the photovoltaic power generation system on the aspects of industry, agriculture and home use is facilitated.

Description

technical field [0001] The invention relates to a method and device for tracking the maximum power of solar energy, in particular to an MPPT method and device based on temperature and light intensity feedback. Background technique [0002] With the rapid development of industry, the human demand for energy continues to grow, and the world trend has begun to seek new energy sources to replace conventional energy resources. As one of the available alternative energy sources, photovoltaic energy becomes one of the most promising renewable energy sources. Photovoltaic energy is clean and simple in design. Now, whether it is household or industrial, they are very optimistic about photovoltaic power generation. They hope that photovoltaic energy can be fully utilized and widely used in all aspects of people's life and production in the future. However, high installation cost and low photovoltaic efficiency are the two main disadvantages of photovoltaic systems, and the low photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02B10/10Y02E10/56
Inventor 刘星桥陈元
Owner JIANGSU UNIV
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