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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 pow

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

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Claims

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Application Information

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Owner JIANGSU UNIV
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