Maximum power tracing method

A technology of maximum power tracking and maximum power, applied in the direction of single-grid parallel feeding arrangement, etc., can solve problems such as power loss, complex mathematical model of photovoltaic cells, etc., to avoid shock and negative effects, easy to implement, and simplified control.

Active Publication Date: 2010-04-14
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0010] Because the disturbance observation method needs to disturb the terminal voltage of the photovoltaic cell at all times, it also has some unavoidable disadvantages: in steady state, it can only oscillate near the maximum power point, resulting in a certain power loss. It is caused by the principle of the law itself, so it cannot be completely avoided, and the power loss can only be reduced by reasonably selecting the size of the disturbance
This method requires an additional photovoltaic cell and requires a complex and accurate mathematical model of the photovoltaic cell

Method used

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Embodiment Construction

[0061] Refer to the attached image 3 , an instance of a maximum power tracking method, which includes the following steps:

[0062] a) detecting the output power P of the power generating equipment as the maximum power tracking object and the control variable X of the output power, and determining the relationship P(x) between the control variable X and the output power P;

[0063] b) Determine the variation range of the control variable X [x min , x max ] and the maximum power P of the generating equipment within this range max And the control variable X corresponding to the maximum power * ;

[0064] c) Obtain the maximum power operating point A opt and its control variable X opt , and obtain the control variable X' corresponding to the equivalent output power of the maximum power operating point according to the output power-control variable curve of the power generation equipment opt , and the critical control variable value X of power generation equipment connecte...

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Abstract

The invention discloses a maximum power tracing method, which is used to detect the output power P of generating equipment which are taken as maximum power tracing objects and the control variable X of the output power, and to determine the relation P (x) between the control variable X and the output power P. Four areas are sequentially formed in the mobility scale [xmin, xmax] of the control variable X by having Xio, X'opt and Xopt as critical points, different interconnected powers Pe are used in each area, and Aopt is used as a clamped point to carry out the interconnected power control. The method is simple and convenient to achieve, strong in capacity of resisting disturbance and helpful to stable control of electric power systems.

Description

(1) Technical field [0001] The invention relates to a maximum power tracking method, in particular to a maximum power tracking method applied to wind power generation and solar power generation systems. Maximum Power Tracking, also known as Maximum Power Point Tracking, namely Maximum Power Point Tracking, referred to as MPPT, means that the controller can detect the power generation voltage of the power generation equipment in real time, and track the maximum power value, so that the system can charge the battery with the highest efficiency or incorporate power grid. (2) Background technology [0002] With the rapid development of society, the energy crisis has gradually become prominent, and new energy power generation technologies such as wind power and solar power have been developed rapidly. MPPT technology is one of the key technologies of new energy power generation systems. In just over ten years, MPPT methods have been continuously proposed. Commonly used MPPT meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 赵义术
Owner STATE GRID CORP OF CHINA
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