Method and device for tracking maximum power point of photovoltaic array

A maximum power point and photovoltaic array technology, applied in the field of solar energy, can solve problems such as oscillation and misjudgment, low dynamic tracking speed, and poor steady-state tracking accuracy

Inactive Publication Date: 2012-05-02
SHENZHEN ACAD OF AEROSPACE TECH
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Problems solved by technology

Similar to the stirring observation method, the conductance incremental method also has the problems of oscillation and misjudgment, as well as low dynamic tracking speed and poor steady-state tracking accuracy.
On the one hand, when searching for the operating point voltage within a step range near the maximum power point, there will be a situation where the operating point oscillates on both sides of the maximum power point, that is, the oscillation problem; Misjudgment occurs when tracking

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  • Method and device for tracking maximum power point of photovoltaic array

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] figure 1 The flow chart of the method for maximum power point tracking of a photovoltaic array provided by an embodiment of the present invention is shown, and the method is a method for maximum power point tracking of a conductance increment method based on power prediction with a variable step size.

[0040] In step S101, the grid-connected inverters are measured respectively , and point of power , and .

[0041] In step S102, according to the formula calculate .

[0042] In step S103, according to the formula Calculate the power difference.

[0043] In step S104, it i...

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Abstract

The invention is suitable for the solar energy field and provides a method and a device for tracking a maximum power point of a photovoltaic array. In an embodiment of the method and the device, the maximum power point tracking method with high dynamic steady-state performance is an electric conducting incremental method based on variable step and power forecast. The maximum power point tracking method can avoid defects of methods such as a conventional electric conducting incremental method and a variable step electric conducting incremental method, improves dynamic tracking speed and steady-state tracking accuracy, effectively restrains oscillation and erroneous judgment, and tracks the maximum power point in real time and accurately.

Description

technical field [0001] The invention belongs to the field of solar energy, in particular to a method and device for tracking a maximum power point of a photovoltaic array. Background technique [0002] For photovoltaic power generation systems, the optimal working state of photovoltaic cells should be sought to maximize the conversion of light energy into electrical energy. The so-called maximum power point tracking technology is the technology to achieve the maximum power output operation of photovoltaic cells through control methods. [0003] Using the incremental conductance method to achieve maximum power point tracking has high control stability. When the external environmental parameters change, the system can track the changes smoothly, and it has nothing to do with the characteristics and parameters of photovoltaic cells. Similar to the stirring observation method, the incremental conductance method also has the problems of oscillation and misjudgment, as well as low...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67H02N6/00
CPCY02E10/58Y02E10/56
Inventor 邢浩江张东来张华
Owner SHENZHEN ACAD OF AEROSPACE TECH
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