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Control method with solar maximum power tracing

A technology of maximum power tracking and control method, which is applied in the field of solar tracking, can solve the problems of high cost, low tracking accuracy, and low output efficiency, and achieve the effect of low cost, good tracking effect, and high output efficiency

Active Publication Date: 2014-04-09
GUANGDONG ELX LIGHTING TECH
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Problems solved by technology

[0003] It can be seen that in the prior art, the maximum power tracking control of solar energy has problems such as low output efficiency, low tracking accuracy, high cost and even tracking failure.

Method used

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Embodiment Construction

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] figure 1 It is a schematic flow chart of the control method with solar maximum power tracking in the present invention. Such as figure 1 Shown, the method for solar maximum power tracking control of the present invention comprises the following steps:

[0021] Step 1. According to the open circuit voltage of the solar cell, obtain the maximum power reference point voltage U RF =76%U OC ; among them, U OC is the open circuit voltage of the solar cell.

[0022] Step 2. Obtain the real-time digital power P(k) of the solar cell according to the detected real-time digital direct current voltage u(k) and real-time digital direct current i(k) of the solar cell; wherein, k is a natural number.

[0023] Step 3. Compare whether P(k)>P(...

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Abstract

The invention provides a control method with solar maximum power tracing. The method comprises the steps of: obtaining the voltage of the maximum power reference point; obtaining a real time digital power of a solar battery; determining the disturbance direction of a real time digital current voltage according to the real time digital power and adjusting the step length of a duty cycle according to formation or not and the change quantity of the real time digital current voltage; and adjusting the real time digital current voltage according to the duty cycle of a drive signal to realize solar maximum power tracing. The control method with solar maximum power tracing provided by the invention has the advantages of higher output efficiency, better tracing effect and lower cost, and can be widely applied to the application field of solar energy.

Description

technical field [0001] The invention relates to solar tracking technology, in particular to a control method with solar maximum power tracking. Background technique [0002] At present, the common methods of maximum power point tracking (MPPT, Maxi Power Point Tracking) in photovoltaic power generation systems include constant voltage method (CVT, Constant Voltage Tracking), perturbation and observation method (P&O, Perturbation and Observation Algorithm), conductance incremental method ( IncCond, Incremental Conductance Algorithm), etc. The Chinese patent with the application number 200410101900.1 and titled "A Solar Photovoltaic Power Maximum Power Tracker and Control Method" uses the constant voltage method to realize the maximum power tracking of solar photovoltaic power generation, that is, the operating voltage and open circuit when using solar photovoltaic cells to output maximum power The approximate proportional relationship between the voltages is used for maximum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 张京玲谭国振龙佳乐何文丰
Owner GUANGDONG ELX LIGHTING TECH
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