An improved incremental admittance method for maximum power point tracking of solar cells

A solar cell and maximum power point technology, which is applied in the direction of adjusting electrical variables, photovoltaic power generation, electrical components, etc., can solve the problems of drastic changes in light intensity, maximum power point tracking direction misjudgment time, etc.

Inactive Publication Date: 2011-12-21
36TH RES INST OF CETC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

How to overcome the misjudgment time of the maximum power point tracking direction caused by the drastic change of the light intensity is a key technical problem that needs to be solved at present

Method used

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  • An improved incremental admittance method for maximum power point tracking of solar cells
  • An improved incremental admittance method for maximum power point tracking of solar cells
  • An improved incremental admittance method for maximum power point tracking of solar cells

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specific Embodiment approach

[0035] A specific embodiment of the present invention is as follows:

[0036] The control system is realized by DSP, assuming that the scan period of MPPT is 2s, the output current and voltage of the solar cell are collected at 0s, and V 1 , I 1 ; At the end of a scanning period of MPPT, that is, at the time of 2s, the current and voltage are sampled once, and V is obtained 2 , I 2 ;Increase the voltage once in 1s, sample the current, and get V 3 I 3 .

[0037] 1) Assuming no change in illumination, then by the formula To determine the next tracking direction. When D>0, the output command voltage of MPPT changes to the direction of increase, otherwise the output command voltage of MPPT changes to the direction of decrease, such as figure 1 shown in the flow chart.

[0038] 2) When the light changes, The change of current is caused by the change of illumination and the effect of MPPT. When the change of illumination intensity exceeds the critical value, it may cau...

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Abstract

The invention discloses an improved incremental conductance method for realizing maximum power point tracking of a solar cell. In the improved incremental conductance method, an operation work zone of the solar cell is judged according to the acquired output voltage and power of the solar cell, and different control modifying instructions are adopted according to different work zones so as to realize the maximum power point tracking of the solar cell. The improved incremental conductance method is characterized in that output voltage and current sampling of a disposal solar cell are increasedin an original MPPT (Maximum Power Point Tracking) scanning period, current variation caused by illumination change is eliminated by using an algorithm, thus the direction misjudgment generated by the incremental conductance method due to sharp change of the illumination intensity is avoided, and further the reliability of a maximum power point tracking system of the solar cell is improved.

Description

technical field [0001] The invention relates to an improved admittance increment method for tracking the maximum power point of a solar cell, and belongs to the technical field of photovoltaic power generation system control. Background technique [0002] The output power of solar panels is strongly nonlinear, and it is closely related to the light intensity and ambient temperature. Under a certain light intensity and temperature, the output power of the solar cell does not change linearly. After exceeding a certain voltage, the output power decreases with the increase of the voltage. Only when the solar cell works at a certain voltage can its output power reach the maximum value. At this time, the operating point of the solar cell is at the highest point of the P-V curve, which is called the maximum power point (Maximum Power Point). In order to improve the power generation efficiency and reduce the cost of the solar power generation system, the solar cell should work at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67H02N6/00H02S40/30
CPCY02E10/58Y02E10/56
Inventor 方淼楼华勋董睿马尚行
Owner 36TH RES INST OF CETC
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