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A photovoltaic peak power tracking method based on astable oscillation extreme value search

A peak power, non-steady-state technology, applied in photovoltaic power generation, instruments, control/regulation systems, etc., can solve problems such as output instability, achieve good stability, sacrifice convergence speed, and improve search efficiency

Active Publication Date: 2020-07-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the general extreme value search algorithm, change the size of the proportional link k to ensure the search range and speed, but the larger k is, the faster the search speed will be, but the output will be more unstable. For most systems, this kind of vibration is not acceptable.

Method used

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  • A photovoltaic peak power tracking method based on astable oscillation extreme value search
  • A photovoltaic peak power tracking method based on astable oscillation extreme value search
  • A photovoltaic peak power tracking method based on astable oscillation extreme value search

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Embodiment

[0033] figure 1 It is a flow chart of the photovoltaic peak power tracking method based on astable oscillation extremum search in the present invention.

[0034] In this example, if figure 1 As shown, the present invention is a photovoltaic peak power tracking method based on astable oscillation extremum search, and the specific steps include:

[0035] S101: Build a photovoltaic model:

[0036] First, a photovoltaic array model composed of photovoltaic cells connected in series and parallel is established. By setting the illumination value in the relevant sub-modules of the photovoltaic array, the local shadow situation in the actual photovoltaic array is simulated, and the voltage is used as the input of the photovoltaic array model, and the power is used as the input of the photovoltaic array model. output.

[0037] S102: Set the initial voltage:

[0038] Set the initial voltage v of the extreme value search of the astable oscillation method 0 , set the number of extrem...

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Abstract

The invention discloses a photovoltaic peak power tracking method based on astable oscillation extremum search. By tracking the photovoltaic maximum power under local shadows, a photovoltaic array battery is connected in series and parallel to form a photovoltaic array model, and then the photovoltaic sub-module is changed. Illumination intensity is used to simulate the situation of local shadows produced by the actual photovoltaic array model; given the initial input voltage value v 0 , use the astable oscillation method to search for the extreme value according to the preset time, and determine whether the local power extreme value is reached by judging the difference between the power at two similar time points. If not, extend the search time and continue to search for the initial voltage. Local power extreme value, when it is judged that the current local extreme value is reached, the initial voltage value is updated to search for the next local power point, and the search is stopped until the supervision reaches the end condition, realizing the photovoltaic peak power tracking under partial shadow.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and more specifically relates to a photovoltaic peak power tracking method based on astable oscillation extremum search. Background technique [0002] The maximum power MPPT control algorithm of the photovoltaic system can track the maximum power point of the photovoltaic cell to make it more efficient to generate electricity, but the output power of the photovoltaic cell will be affected due to other reasons such as ambient temperature and light intensity. When the light intensity is not uniform, the output power will show multiple peaks, which cannot be solved by the MPPT algorithm. It is hoped that there is a method that can quickly and stably search for multi-peak extremes to solve this problem. Compared with other existing When the system needs to apply its output extremum online in real time, the steady-state oscillation of the perturbation extremum search algorithm it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 殷春王鹏杨晓程玉华张阔黄雪刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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