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Maximum power point tracking method for photovoltaic power system

A photovoltaic power generation system and maximum power point technology, which is applied in photovoltaic power generation, light radiation generators, control/regulation systems, etc., can solve problems such as poor adaptability, slow response speed, and low detection accuracy, and achieve rapid adaptation to changes in the working environment , Reduce system oscillation, improve speed and stabilize the effect of precision

Inactive Publication Date: 2012-02-29
HOHAI UNIV
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Problems solved by technology

However, there are some problems in the application of these conventional maximum power point tracking methods of photovoltaic cells, such as low detection accuracy, slow response speed, poor adaptability and low tracking efficiency, etc.

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  • Maximum power point tracking method for photovoltaic power system
  • Maximum power point tracking method for photovoltaic power system
  • Maximum power point tracking method for photovoltaic power system

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, technical content of the present invention is described:

[0015] Such as figure 1 As shown, in the photovoltaic power generation system, the relationship between the output power, voltage and current of photovoltaic cells is: P=U*I , Under normal working conditions, the power voltage curve of photovoltaic cells is a single convex peak shape, and there is only one maximum power point. When the photovoltaic system works at the maximum power point, the slope =0; at the left of the maximum power point >0, at the right of the maximum power point =0, the supervised Hebb learning rule is used to adaptively adjust the weight coefficient, and the error is adjusted online K The single-neuron self-adaptive PID control algorithm realizes the maximum power point tracking of the photovoltaic power generation system.

[0016] The single-neuron adaptive controller realizes self-adaptation and self-organization functions through...

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Abstract

The invention discloses a maximum power point tracking method for a photovoltaic power system. A maximum power point tracking algorithm is realized in a digital signal processor (DSP) by the current and voltage of a photovoltaic panel from a sampling unit and a current conditioning circuit to control pulse width modulation (PWM) output waveforms to realize power regulation. The maximum power point tracking of a photovoltaic array is realized by adopting a single-neuron adaptive proportion integration differentiation (PID) algorithm comprising the following steps of: initializing etaI, etaP, etaD, a and b, sampling the output voltage and current of the photovoltaic panel, calculating the derivative of power of a photovoltaic array over the voltage at a current moment, calculating an error and adaptively regulating a weight coefficient and a K value according to the magnitude of the error. Compared with the conventional maximum power point tracking algorithm, the invention improves maximum power point tracking accuracy and stability and increases maximum power point tracking speed.

Description

technical field [0001] The invention relates to a maximum power tracking method of a photovoltaic battery. The present invention relates to photovoltaic cells. The invention relates to a photovoltaic grid-connected power generation system. The invention relates to a photovoltaic off-grid power generation system. Background technique [0002] As we all know, in today's pursuit of a low-carbon society, solar energy, as a clean and renewable energy source, has attracted more and more attention from all countries in the world. With the strong support of the governments of various countries, the average annual growth rate of global solar photovoltaic cell production is 60%. According to a report released by Solarbuzz, an authoritative research institution for the photovoltaic power generation market, the global photovoltaic power generation market will reach 15GW in 2010, and there will be 9 countries with a photovoltaic power generation market size exceeding 250MW in the worl...

Claims

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Application Information

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IPC IPC(8): H02N6/00G05F1/67
CPCY02E10/56
Inventor 袁晓玲范发靖周素梅张叶李世军
Owner HOHAI UNIV
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