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Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system

A photovoltaic power generation system and maximum power tracking technology, applied in photovoltaic power generation, light radiation generators, control/regulation systems, etc., to achieve the effects of reducing oscillation amplitude, improving system efficiency, and quickly adapting to changes in the working environment

Inactive Publication Date: 2013-02-13
HOHAI UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new maximum power tracking method for the problems existing in the background technology, which can solve some problems existing in the existing maximum power tracking method

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  • Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system
  • Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system
  • Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system

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Embodiment Construction

[0025] The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0026] Under stable light conditions, the output power and voltage curve of the photovoltaic array is a single convex peak shape, and there is a single maximum power point. Single-stage photovoltaic grid-connected power generation system adopts double closed-loop inverter control strategy of voltage outer loop and current inner loop (with figure 1 Take the single-stage grid-connected system as an example, the off-grid system is similar), such as figure 2 As shown, a high-precision single-stage photovoltaic power generation system maximum power tracking method is specifically implemented as follows:

[0027] Step 1: Before the system starts, sample the open circuit voltage V of the photovoltaic array through the voltage transformer and voltage sensor OC (k) and stored in DSP;

[0028] Step 2: Set the given voltage V of the constant voltage ...

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Abstract

The invention discloses a method for tracking the maximum power of a high-accuracy single-stage photovoltaic power generation system. According to the method disclosed by the invention, a two-stage maximum power tracking method combining a constant voltage method with a variable step size conductance increment method based on power difference disturbance is proposed, the constant voltage method is utilized to fast track to a position near the maximum power point of a photovoltaic system at a first stage, the constant voltage method is switched into the variable step size conductance increment method based on the power difference perturbation to accurately track the maximum power point of the photovoltaic system at a second stage, therefore the fast tracking of the maximum power point and the high-accuracy operation of the maximum power point are realized. The method disclosed by the invention can be used for effectively solving the problems of oscillation near the maximum power point, erroneous judgment, and the like of the conventional perturbation and observation method and realizing the fast and high-accuracy tracking of the single-stage photovoltaic power generation system on the operation of the maximum power point.

Description

Technical field [0001] The invention relates to a single-stage photovoltaic power generation system maximum power tracking method, which belongs to the technical field of photovoltaic grid-connected (off-grid) power generation systems. Background technique [0002] With the increasingly prominent global energy shortage and security issues in recent years, the use of renewable energy has attracted widespread attention. As an effective means of using solar energy, photovoltaic power generation has been vigorously promoted by governments all over the world. Compared with Europe and the United States, although my country's photovoltaic industry started late, it has developed rapidly in recent years. How to improve the efficiency of photovoltaic power generation systems and reduce costs is the main problem facing photovoltaic development at this stage. Finding photovoltaic cell materials with higher conversion efficiency, adopting a power generation system topology with fewer stages...

Claims

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Application Information

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IPC IPC(8): G05F1/67H02N6/00
CPCY02E10/58Y02E10/56
Inventor 刘皓明袁晓玲范发靖
Owner HOHAI UNIV
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