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A control method and device for preventing mppt misjudgment

A control method and algorithm technology, applied in control/regulation systems, photovoltaic power generation, instruments, etc., can solve the problem of low utilization of photovoltaic cells

Active Publication Date: 2017-01-18
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0013] The invention provides a control method and device for preventing the misjudgment of the MPPT circuit. The invention can effectively solve the problem of misjudgment of the MPPT circuit and cause the problem of low use of photovoltaic cells, thereby improving the solar energy utilization rate of the MPPT circuit

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  • A control method and device for preventing mppt misjudgment
  • A control method and device for preventing mppt misjudgment

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Embodiment Construction

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] Such as Figure 4 As shown, the present invention provides a kind of control method that prevents MPPT misjudgment, comprising:

[0069] Changes in MPPT status include changes in light intensity or changes in the output voltage of photovoltaic cells. Changes in light intensity include increased light intensity and slight decrease in light intensity. Changes in the output voltage of photovoltaic cells include: increase in output voltage of photovoltaic c...

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Abstract

A control method and device for preventing MPPT misjudgement, the method comprising: a first operating point, a second operating point and a third operating point are obtained, and the second operating point is moved to the third operating point according to a current movement direction; the power of the second operating point and the power of the third operating point are obtained, and when the power of the second operating point is greater than that of the third operating point, it is determined that misjudgement has occurred, and the operating point following the third operating point is moved in the reverse direction, so as to achieve the goal of adjusting the movement direction of the operating points of a photovoltaic cell in a timely manner. The control method has a simple principle, performs adjustment in a timely manner after misjudgement has occurred in the photovoltaic cell, and enables the solar energy utilisation rate to be increased.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a control method and device for preventing MPPT misjudgment. Background technique [0002] Now solar energy is one of the new energy sources. In order to convert solar energy into usable electrical energy, a circuit with MPPT (max power point tracking, maximum power tracking) function is needed. This circuit uses photovoltaic cells to convert solar energy into electrical energy. The PU characteristic curve when the light intensity is constant is as follows: figure 1 As shown, where the horizontal axis is the voltage U, and the vertical axis is the power P, by figure 1 It can be seen that there is a maximum power point in the entire PU characteristic curve of the photovoltaic cell, which is called the MPP point. The greater the power of the photovoltaic cell, the more output power and the higher the utilization rate of solar energy. Therefore, during the working process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 刘瑞孙丰涛陈洪涛程良意
Owner GREE ELECTRIC APPLIANCES INC
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