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Peak power output tracking method and system for solar battery

A maximum output power, solar cell technology, applied in control/regulating systems, regulating electrical variables, instruments, etc., can solve problems such as slow tracking speed and loss of conversion efficiency, and achieve the effect of improving tracking speed

Inactive Publication Date: 2011-01-26
深圳市科奥信电器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the existing technology are: the tracking speed is slow, and there is a certain loss of conversion efficiency during the tracking process

Method used

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  • Peak power output tracking method and system for solar battery
  • Peak power output tracking method and system for solar battery
  • Peak power output tracking method and system for solar battery

Examples

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Embodiment Construction

[0023] figure 1 It is a flow chart of the method for tracking the maximum output power of a solar cell according to an embodiment of the present invention. In this embodiment, the method for tracking the maximum output power of a solar cell starts at step S1. In step S1, the output voltage US and the corresponding output current IS of the solar cell are first sampled at a first time interval within a power variation cycle. The first time interval may be a sinusoidal pulse width modulation chopping cycle, and a photovoltaic grid-connected system includes dozens to hundreds of sinusoidal pulse width modulation (SPWM) chopping cycles in one power change cycle. Then in each power change cycle, the maximum output voltage value U of the solar cell in this cycle is screened out max And the corresponding current value I1 and the minimum output voltage value U of the solar cell min And the corresponding current value I2. When the solar battery maximum output power tracking method i...

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Abstract

The invention relates to peak power output tracking method and system for a solar battery. According to the invention, the method comprises the steps of: firstly, sampling an output voltage US and a corresponding output current IS of the solar battery by using a solar battery voltage and current sampling as well as maximum and minimum screening module with a first time interval, and screening to obtain a maximum output voltage value Umax, a minimum output voltage value Umin and corresponding current values I1 and I2 of the solar battery within a power change period; secondly, calculating a power P1 corresponding to the maximum output voltage and a power P2 corresponding to the minimum output voltage of the solar battery as well as a power difference delta P=P1-P2 by a power difference calculation module; and thirdly, carrying out proportional plus integral control or fuzzy control on delta P by a controller to ensure that the delta P is equal to 0 to obtain a working voltage value Ug corresponding to the maximum output power of the solar battery, wherein the Ug is used as a working voltage of the solar battery. The invention can be used for rapidly tracking a maximum output power point so as to improve the energy conversion efficiency of the solar battery.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected power generation, in particular to a method and system for tracking the maximum output power of a solar cell. Background technique [0002] Photovoltaic grid-connected power generation is a green new energy power generation technology. It uses the principle of photovoltaic effect to convert the energy of sunlight into DC power through solar cells, and then converts it into AC power with the same frequency and phase as the power grid through the inverter. The grid generates electricity. Due to the nonlinearity of the solar cell, there is a maximum output power point within the working range of the solar cell, and the solar cell operates at this working point, and the energy conversion efficiency reaches the highest. The maximum output power tracking methods of solar cells in the prior art, such as: climbing method, conductance method, etc., require to always move back and forth near the ...

Claims

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Application Information

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IPC IPC(8): H02J3/38G05F1/67
Inventor 戴建华
Owner 深圳市科奥信电器有限公司
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