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Method of max power point tracing controlled by direct electrical current of photovoltaic power generation system

A photovoltaic power generation system, maximum power point technology, applied in photovoltaic power generation, light radiation generator, generator/motor, etc., can solve the problem of increasing the computational burden of the controller

Inactive Publication Date: 2008-06-18
SHANGHAI UNIV +1
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  • Description
  • Claims
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Problems solved by technology

However, the perturbation and observation method oscillates near the maximum power point when the tracking is stable. At the same time, the perturbation and observation method needs to sample the output voltage and current of the photovoltaic cell, and needs to multiply the sampling results to calculate the power, which increases the computational burden of the controller.

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  • Method of max power point tracing controlled by direct electrical current of photovoltaic power generation system
  • Method of max power point tracing controlled by direct electrical current of photovoltaic power generation system
  • Method of max power point tracing controlled by direct electrical current of photovoltaic power generation system

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Embodiment Construction

[0036] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:

[0037] The maximum power point tracking method for direct current control of a photovoltaic power generation system described in the present invention can be applied to a current-type grid-connected photovoltaic power generation system, and can also be used in an independent photovoltaic power generation system. The following descriptions are made respectively:

[0038] Looking at Figure 3 first, the current-type grid-connected photovoltaic power generation system applying the control method described in the present invention includes:

[0039] (1) Photovoltaic panel: As the input of the whole system, it provides electric energy for the whole system including control circuit and detection circuit. When there is light, the solar panel converts the received light energy into electrical energy; when there is no light, it stops working and the outpu...

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Abstract

The invention relates to a maximum power point tracking method of a photovoltaic generation system direct current control, which is applicable to current-typed grid-connected photovoltaic generation system or independent photovoltaic generation system with accumulator charging links. The invention takes the output current of the converter as the reference value only, can carry out the maximum power point tracking by comparing the values of a previous current and a subsequent current only, and has the advantages of fast tracking speed, good stability, simple algorithm, little detecting devices, low precision requirement, etc.

Description

technical field [0001] The invention relates to a maximum power point tracking method for direct current control of a photovoltaic power generation system, and belongs to the technical field of new energy power generation control systems. Background technique [0002] The independent photovoltaic power generation system has its own energy storage link, which mainly solves the power supply problem in remote areas without electricity; the grid-connected photovoltaic power generation system is directly connected to the grid, like a small distributed power station, feeding the collected electric energy into the grid. [0003] Photovoltaic cells use the photoelectric effect to generate current. The voltage-current curve is shown in Figure 2. The V-I curve in the figure is the volt-ampere characteristic curve, and the V-P curve is the power curve. It can be seen from Figure 2 that in a certain environment, each photovoltaic panel has a maximum power point P max In order to improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00H02J7/35G01R19/165
CPCY02E10/58Y02E10/566Y02E10/56
Inventor 吴春华崔开涌陈国呈肖鹏
Owner SHANGHAI UNIV
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