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Improved maximum power point tracking method for photovoltaic power generation system

A photovoltaic power generation system and maximum power point technology, applied in photovoltaic power generation, control/regulation systems, and regulation of electrical variables, etc., to achieve the effects of low power consumption, fewer circuit components, and strong stability

Inactive Publication Date: 2017-01-04
JIANGSU UNIV
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Problems solved by technology

[0005] Aiming at the problems existing in the background technology, the present invention provides a new maximum power point tracking method, which can effectively solve the problems in the existing maximum power point tracking method

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  • Improved maximum power point tracking method for photovoltaic power generation system

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Embodiment Construction

[0027] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] The working principle of the present invention is: an improved maximum power point tracking method for a photovoltaic power generation system, which is based on a combination of a constant voltage method and a modified variable-step conductance incremental method. At the beginning, the constant voltage method (CVT) is used to quickly track to the vicinity of the maximum power point of the photovoltaic power generation system, and then switch to the modified variable step conductance incremental method to further track to the maximum power point, so as to achieve fast tracking and high-precision operation. Solve the deficiencies in the current conventional algorithms.

[0029] Photovoltaic power generation system pre-stage DC / DC boost circuit such as figure 1 As shown, the positive electrode of the photovoltaic cell is conne...

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Abstract

The invention discloses an improved maximum power point tracking method for a photovoltaic power generation system. The improved maximum power point tracking method comprises a Boost circuit, a voltage and current sampling circuit, an IR2110 isolation driving circuit and a digital signal processor DSP, wherein the digital signal processor DSP is connected with the voltage and current sampling circuit and the IR2110 isolation driving circuit; the IR2110 isolation driving circuit is connected with a power switch tube Q of the Boost circuit; the digital signal processor DSP controls the duty cycle adjustment of the power switch tube according to voltage U (k) and current I (k) which are acquired in real time to enable the output of a photovoltaic cell to reach the maximum power point. According to the improved maximum power point tracking method, in the beginning, the constant voltage tracking (CVT) method is adopted to quickly track to be close to the maximum power point of the photovoltaic power generation system, and then the modified variable step-size incremental conductance method is switched to further track to the maximum power point, so that quick tracking and high-precision operation are realized, and shortcomings in conventional algorithms at present are overcome.

Description

technical field [0001] The invention relates to a method and device for tracking the maximum power point of solar power generation, in particular to a constant voltage method and a corrected variable step-length conductance increment method and device. Background technique [0002] The extensive use of conventional fossil fuels around the world has had a serious impact on the living environment of human beings. Therefore, it is becoming more and more urgent for today's society to find a new energy that is clean, efficient, and long-term usable to replace fossil energy. As a clean and pollution-free new energy source, solar energy has huge reserves and is inexhaustible, so it has attracted more and more attention. Photovoltaic power generation is an important form of solar energy utilization, and with the continuous advancement of technology, photovoltaic power generation may be one of the most promising power generation technologies. [0003] As a very important part of the...

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 刘星桥张宗龙丁网芳
Owner JIANGSU UNIV
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