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Double-layer nesting search method for tracking maximum power point in photovoltaic generating system

A photovoltaic power generation system and maximum power point technology, applied in photovoltaic power generation, light radiation generators, photovoltaic modules, etc., to reduce complexity, improve search efficiency, and effectively track

Inactive Publication Date: 2010-01-13
HOHAI UNIV
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Problems solved by technology

[0004] In order to solve the balance problem between adaptability and complexity in the maximum power point tracking algorithm, the present invention proposes a double-layer nested search method for maximum power point tracking in a photovoltaic power generation system

Method used

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  • Double-layer nesting search method for tracking maximum power point in photovoltaic generating system
  • Double-layer nesting search method for tracking maximum power point in photovoltaic generating system
  • Double-layer nesting search method for tracking maximum power point in photovoltaic generating system

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Embodiment Construction

[0028] Such as figure 1 Shown is the maximum power point tracking (MPPT) hardware structure diagram, including solar cell array, main circuit DC / DC converter, battery or load, voltage and current signal extraction module, PWM drive circuit, Freescale main chip control module.

[0029] Such as image 3 Shown is a schematic structural diagram of a vehicle-mounted independent photovoltaic system, which is a specific example of the application of the present invention. The system structure charges the lead-acid battery through the solar panel, and can drive the load, and realize functions such as MPPT control, charge and discharge control, and drive in the microcontroller. The double-layer nested search method for maximum power point tracking of the present invention is used to Realize the MPPT control part among them.

[0030] according to figure 1 with image 3 The structure shown builds the main loop. The solar panel converts solar energy into electrical energy, and conver...

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Abstract

The invention discloses a double-layer nesting search method for tracking a maximum power point in a photovoltaic generating system, belonging to the field of tracking the maximum power point in the photovoltaic generating system. The method realizes specific division to the function by means of algorithm structures of the inner layer and the outer layer: compressing initial search regions to finish delimitation of the power point in the outer-layer control algorithm; and searching the maximum power point in the compressed region to satisfy the design requirement by using an equal step length disturbance observing method in the inner-layer algorithm. In the event of great change of the external environmental condition, the invention can adjust the interval range by a conversion mechanism in time to ensure stronger adaptability of the method. The algorithm designed by the nesting structure can enhance the adaptability of the system to the environmental change and have the advantages of clear structure, specific function, simple realization, and the like.

Description

technical field [0001] The invention relates to a search method for solving the problem of maximum power point tracking in a photovoltaic power generation system, in particular to a double-layer nested search method for maximum power point tracking in a photovoltaic power generation system, which belongs to the maximum power point tracking in a photovoltaic power generation system field. Background technique [0002] In the photovoltaic power generation system, the most concerned issue is the maximum power point tracking problem, that is, to keep the system working at the peak point of the power curve, and to convert solar energy into electrical energy with maximum efficiency. When choosing an optimization method, it is necessary to consider many factors, including the difficulty of implementation, economic cost, sensor accuracy requirements, response speed, etc., especially when the external environment changes such as light and temperature cause frequent changes in the max...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00G05B19/04H02S40/30
CPCY02E10/50
Inventor 王冰周其进钱艳平康孝胜韩伟李健胜
Owner HOHAI UNIV
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