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Photovoltaic power generation system maximum power tracking method and apparatus considering the factor of haze

A photovoltaic power generation system, maximum power tracking technology, applied in photovoltaic power generation, general control system, control/regulation system, etc., can solve the problems of not considering the influence factors of smog, impossible to obtain tracking effect, low tracking accuracy, etc., to achieve Effects of improving tracking accuracy, reducing power loss, and increasing tracking speed

Inactive Publication Date: 2015-10-07
STATE GRID QINGHAI ELECTRIC POWER +2
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AI Technical Summary

Problems solved by technology

However, the existing maximum power tracking methods for photovoltaic power generation do not consider the influencing factor of haze, so it is impossible to obtain ideal tracking results.
[0009] To sum up, the existing methods for tracking the maximum output power of photovoltaic cells have shortcomings such as poor real-time performance and low tracking accuracy, so it is necessary to improve them

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  • Photovoltaic power generation system maximum power tracking method and apparatus considering the factor of haze
  • Photovoltaic power generation system maximum power tracking method and apparatus considering the factor of haze
  • Photovoltaic power generation system maximum power tracking method and apparatus considering the factor of haze

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Embodiment Construction

[0037] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only exemplary, and are not intended to limit the patent protection scope of the present invention and its application.

[0038] figure 1It is a structural schematic diagram of the maximum power tracking device of the present invention, which includes: MPPT controller, battery temperature sensor T, PM2.5 concentration sensor PM, voltage sensor PT (+HT—positive pole; -HT—negative pole; M1—measurement signal output terminal), current sensor CT (IIN—positive pole; IOUT—negative pole; M2—measurement signal output terminal), the first power tube Q1 (S—source; D—drain; G—gate), the second power tube Q2 (S—source; D—drain; G—gate), DC-DC converter (voltage input positive terminal IN+, voltage input negative terminal IN-, pulse width modulation signal input DRIVE, voltage output positive terminal OUT+, The volta...

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Abstract

The invention provides a photovoltaic power generation system maximum power tracking method and apparatus considering the factor of haze. The method includes the following steps: a. acquiring photovoltaic cell open-circuit voltage, short-circuit current, and cell temperature, and PM 2.5 concentration in air; b. inputting acquired data into a BP neural network prediction model improved based on a harmony search algorithm to obtain a MPP voltage predicted value; c. adjusting the PWM control signal duty factor of a DC-DC converter through a PI controller to enable the actual work voltage of the photovoltaic cell to reach the MPP voltage predicted value; and d. taking the MPP voltage predicted value as an initial value and tracking the maximum power of the photovoltaic cell at a specified disturbance step by means of a perturbation and observation method. The invention further provides a corresponding tracking device. Through the combination of the perturbation and observation method and the model forecasting method and the full consideration of the influence of haze weather to photovoltaic generation, the MPPT tracking precision can be effectively improved, the power loss of a static state is reduced, and the MPPT tracking speed can be improved.

Description

technical field [0001] The invention relates to a maximum power tracking method and device of a photovoltaic power generation system considering haze factors, and belongs to the technical field of power generation. Background technique [0002] With the development of the global economy, the human demand for energy continues to grow, and it is imperative to develop and utilize renewable energy. It is predicted that by the middle of this century, renewable energy will account for more than 50% of the world's energy structure, and will gradually become the focus of basic energy for human society. Solar energy is a kind of renewable energy with unique advantages, its development and utilization will surely get great development, and it may become the dominant energy in the later period of this century. [0003] Photovoltaic power generation is one of the main forms of solar energy utilization. The output power of photovoltaic power generation is related to the external enviro...

Claims

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Application Information

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IPC IPC(8): G05F1/67G05B13/04
CPCY02E10/56
Inventor 刘卫亮黄鹏陈文颖刘长良马进马良玉林永君马永光
Owner STATE GRID QINGHAI ELECTRIC POWER
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