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An unobstructed tracking method for a dual-axis solar photovoltaic power generation system

A solar photovoltaic and power generation system technology, applied in the field of solar panel tracking, can solve the problems of lower power generation efficiency, front solar panels blocking rear solar panels, and increased land area occupied by the power generation system.

Active Publication Date: 2016-12-14
深圳市益力盛电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is another problem that cannot be ignored in the solar tracking system, especially in the large-scale solar photovoltaic power generation system, the sun altitude angle is low in the morning and evening, during the tracking process, the front row of solar panels will partially or even completely block the rear row of solar panels
In this way, although the solar panels in the front row can generate electricity normally, the power output of the solar panels in the rear row is reduced due to shading, which leads to a decrease in the overall power generation of the solar panel array; at the same time, when the photovoltaic cells are shaded, the load will be reduced. Consumption of electric energy, with the increase of energy consumption, hot spot phenomenon of overheating or even breakdown will occur, which seriously affects the reliability and service life of the power generation device
[0004] In order to reduce or avoid the shadow phenomenon, the current power generation system adopts the method that the distance between adjacent solar panels is twice the length of the solar panel, but this can only effectively avoid shadow occlusion for a period of time, that is, shorten The time of shadow shading, rather than completely eliminating the shading phenomenon, at the same time, increasing the distance between solar panels will lead to an increase in the land area occupied by the power generation system and reduce the power generation efficiency

Method used

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  • An unobstructed tracking method for a dual-axis solar photovoltaic power generation system
  • An unobstructed tracking method for a dual-axis solar photovoltaic power generation system
  • An unobstructed tracking method for a dual-axis solar photovoltaic power generation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] In the implementation example 1, the specific measurement time is eight o'clock Beijing time.

[0095] 1. Through formula (1)(2)(3)(4)(5), the solar elevation angle as=11.33° and the solar azimuth angle rs=-73.12° are obtained. Then there are |cos rs|=0.29, |sin rs|=0.96.

[0096] 2. |cos rs|

[0097] 3. L'=L|sin rs|=8.61, S=b / sin as=10.18. Therefore S > L', so the shadow of S1 does occlude S3.

[0098] 4. According to formula (11), adjust the inclination angle of the solar panel Make the shadow of S1 just not block S3.

[0099] By realizing the above steps, the method for tracking the sun without occlusion at this time is completed.

Embodiment 2

[0101] In the implementation example 2, the specific measurement time is ten o'clock Beijing time.

[0102] 1. Through formula (1)(2)(3)(4)(5), the sun elevation angle as=33.26° and the sun azimuth angle rs=-51.17° are obtained. Then there are |cos rs|=0.54, |sin rs|=0.78.

[0103] 2. |cos rs|≥a / L=0.33, |sin rs|≥a / H=0.6. So the shadow of S1 may occlude S4.

[0104] 3. S=b / sinas=3.65. Therefore S

[0105] 4. At this time, it belongs to the situation of no occlusion, according to formula (10), adjust the inclination angle of the solar panel

[0106] By realizing the above steps, the method for tracking the sun without occlusion at this time is completed.

[0107] At present, the tracking method of keeping the surface of the solar panel perpendicular to the sun's rays is widely used, and the existing power generation is calculated as follows:

[0108] Q r =abAXYsin(as+φ r ) (15)

[0109] Q=abAXY (16)

[0110] Q c=LAX(Y-1)b...

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Abstract

The invention provides a non-blocking tracking method for a dual-axis solar photovoltaic power generation system. According to the solar azimuth angle, when the solar panel is perpendicular to the sun's rays, the shadow of the solar panel and other solar panels are blocked, and according to the blocked situation , dynamically adjust the inclination angle of the solar panel, so that the shadow of the solar panel will not block the adjacent solar panels. In the present invention, since the inclination angle of the solar panel is gradually increased from 0°, the solar panel will not block any moment when the solar panel is tracking the sun, and all the solar panels can generate electricity evenly, which protects the power generation device well; and does not require Increase the distance between the solar panels, thereby improving the total daily power generation and power generation efficiency of the solar panel array under the same conditions.

Description

technical field [0001] The invention relates to the field of solar power generation, in particular to solar panel tracking in a solar power generation system. Background technique [0002] In the solar photovoltaic power generation system, the automatic light tracking method is used to make the orientation of the solar panel change precisely with the change of the sun position, and always keep the surface of the solar panel perpendicular to the sunlight, which will greatly improve the photoelectric conversion efficiency. Single-axis solar tracking systems can increase power output by 25% compared to fixed systems, while dual-axis solar tracking systems can increase power output by 41% compared to fixed systems. [0003] However, there is another problem that cannot be ignored in the solar tracking system, especially in the large-scale solar photovoltaic power generation system, the sun altitude angle is low in the morning and evening, during the tracking process, the front r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D3/12
Inventor 贺宏锟王甜李康祥王皓
Owner 深圳市益力盛电子有限公司
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