An Efficient Heliostat Sun Tracking Method

A heliostat and high-efficiency technology, applied in the field of efficient heliostat tracking and tracking, can solve problems such as ineffectiveness, high cost, and inability to track, and achieve simple calculation methods, high practicability and reliability, and easy programming. effect achieved

Active Publication Date: 2018-10-02
NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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Problems solved by technology

The disadvantages of the photoelectric tracking method are: ① The photosensitive sensor will only work when there is light. When encountering bad weather (such as cloudy or cloudy), the photosensitive sensor will lose its function, resulting in the failure of tracking
②There are tens of thousands of heliostats in the mirror field of the tower solar thermal power station. If a photoelectric sensor mechanism is installed on each heliostat, the cost will be high

Method used

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  • An Efficient Heliostat Sun Tracking Method
  • An Efficient Heliostat Sun Tracking Method
  • An Efficient Heliostat Sun Tracking Method

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0031] The solar declination angle is the angle between the polar axis of the earth and the polar axis of the ecliptic celestial sphere, and the angle varies on different days of the year. The equation for calculating the solar declination angle δ is:

[0032]

[0033] In the above formula, n is the day of the year.

[0034] The angular velocity of the sun's rotation is called the hour angle, and the change of the hour angle can also reflect the change of the sun's orientation to a certain extent. The calculation formula of the hour angle ω is:

[0035] ω=(12-T)×15°

[0036] In the above formula, T is the local true solar time, and the specific calculation formula is:

[0037]

[0038] In the above formula, T Local is the local time (Beijing time), J is the longitude differ...

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Abstract

The invention provides an efficient heliostat sun tracking method, wherein a solar elevation angle hs and a solar azimuth angle Thetas of the position of a heliostat at a current moment are calculated; and a simplified formula takes the place of an SPA solar position algorithm published by NREL so as to realize calculation of the solar elevation angle and the solar azimuth angle, a sun tracking position of the heliostat is calculated according to optical reflection principles and geometric symmetry principles, and an instruction is sent to a stepping motor to control rotation of the heliostat so as to realize sun tracking control of the heliostat. The calculation method for the solar elevation angle and the solar azimuth angle is simple, has high calculation efficiency, can realize programming easily and is high in practicability and reliability.

Description

【Technical field】 [0001] The invention relates to the field of tower-type solar thermal power generation heliostat control, in particular to an efficient heliostat tracking method. 【Background technique】 [0002] Tower-type solar thermal power generation technology uses heliostats to track the sun, so that the reflected light can be accurately projected onto the heat exchange surface of the heat absorber placed on the top of the receiving tower. The heat absorber converts sunlight energy into heat energy and heats the inside of the coil The flowing medium (water or other fluid) generates medium and high temperature steam to drive the turbogenerator to generate electricity. The key to tower-type solar thermal power generation technology is how to precisely control the tracking track of the heliostat so that the reflected light spot of the sun can be accurately positioned on the tower heat sink. [0003] The existing heliostat tracking control methods can be mainly divided in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D3/12
CPCG05D3/12
Inventor 仇韬孟晓伟毕建惠鲁齐申景军梁柏宏
Owner NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GROUP
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