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Method and device for tracking maximum power point of solar battery

A technology of maximum power point and solar cells, applied in photovoltaic power generation, adjusting electric variables, light radiation generators, etc., can solve the problems of low accuracy, slow convergence speed, and easy oscillation, etc., and achieve high accuracy and search Fast speed and reduced power loss

Active Publication Date: 2013-08-28
BYD SEMICON CO LTD
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Problems solved by technology

[0009] Aiming at the problems of low accuracy, slow convergence speed, and easy vibration generation in the solar cell maximum power point tracking method in the prior art, the present invention proposes a solar cell maximum power point tracking method with high accuracy, low vibration and faster convergence speed. Power point tracking method and device

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  • Method and device for tracking maximum power point of solar battery
  • Method and device for tracking maximum power point of solar battery

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Embodiment Construction

[0033] Such as Image 6 As shown, the present invention provides a solar cell maximum power point tracking method, the method comprising:

[0034] (a) Detect the current output voltage V of the solar cell 1 and the current output current I 1 , and calculate the current output power P 1 , set the voltage change step size ΔV and the predetermined voltage change step size ε whose value is smaller than the voltage change step size ΔV 1 ;

[0035] (b) Change the output voltage to (V 1 -ΔV) and (V 1 +ΔV), the detection voltage is (V 1 -ΔV) and (V 1 +ΔV) current I a and I c , and calculate the output power P a and P c ;

[0036] (c) Compare P a ,P 1 ,P c The size relationship between, and according to P a ,P 1 ,P c The size relationship between performs the following processing:

[0037] When P a ≥P 1 >P c , then V 1 updated to V 1 -ΔV, P 1 updated to P a , and return to step (b);

[0038] When P a 1 ≤P c , then V 1 updated to V 1 +ΔV, the P 1 updated ...

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Abstract

The invention provides a method and device for tracking a maximum power point of a solar battery, wherein the method comprises the following steps: (a) detecting the current output voltage V1 and the current output current I1 of the solar battery, calculating the current output power P1, setting the voltage change step length Delta V and the preset voltage change step length Epsilon 1 of which the value is less than the voltage change step length Delta V; (b) respectively changing the output voltage into (V1-Delta V) and (V1+Delta V), respectively detecting the current Ia and Ic and calculating the output power Pa and Pc; and (c) comparing Pa, P1 and Pc and respectively executing different treatments according to the relationships among the Pa, P1 and Pc. In the method for tracking the maximum power point of the solar battery provided by the invention, a large step length at the primary period of searching is used, and the step length is reduced continuously to perform the searching by means of a three-point comparing method so as to accelerate the searching speed and avoid vibration and error judgment.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, and more particularly relates to a method and device for tracking the maximum power point of a solar cell. Background technique [0002] Photovoltaic power generation technology is a technology that uses solar cells to directly convert sunlight energy into electrical energy based on the principle of "photovoltaic effect". Compared with commonly used thermal power generation systems, photovoltaic power generation systems have the advantages of no pollution, no noise, and simple maintenance, and have been more and more widely used in various occasions that require electric energy. [0003] The key element in a photovoltaic power generation system is the solar cell. Solar cells are expensive and have low conversion efficiency. Therefore, how to improve the energy conversion efficiency of solar cells and how to make the system charge batteries with the highest efficiency is an important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67H02N6/00
CPCY02E10/58Y02E10/56
Inventor 张金亮林海涛何志强杨云
Owner BYD SEMICON CO LTD
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