Linear solar energy concentration device and system control method

Abstract

The invention provides a linear solar energy concentration device. The linear solar energy concentration device comprises a linear concentrator and a linear receiver; the linear receiver is arranged in or near the focal line position of the linear concentrator, and comprises at least two rows of optical receivers arranged in parallel; the tracking accuracy is determined according to the proportional relation of the energy received by all the rows of optical receivers, and thereby, the concentrator is adjusted to carry out accurate tracking; the optical receiver is a photo-thermal receiver, or a photovoltaic receiver or a photo-thermal-photovoltaic composite receiver. The invention also provides a system control method of the linear solar energy concentration device; the system control method is characterized in that a focusing deviation and a degree of deviation of the linear concentrator are determined according to the proportional relation of the values of the energy received by the two parallel rows of optical receivers arranged in parallel, respectively. The linear solar energy concentration device and the system control method have the advantages of simple structure, convenient operation and accurate tracking, and therefore, can be applied to a solar photo-thermal or photovoltaic utilization system or a photo-thermal-photovoltaic composite utilization system at a large scale.

Description

technical field [0001] The invention relates to the technical field of concentrating and automatic tracking, in particular to a linear concentrating device and a system control method for efficiently collecting and utilizing solar energy by tracking the sun accurately in real time. Background technique [0002] Sunlight is one of the renewable energy sources with the most abundant reserves in the world. The effective collection and rational use of sunlight has broad prospects and far-reaching significance under the unfavorable circumstances of the gradual shortage of conventional energy sources such as coal, oil, and natural gas. Therefore, it is highly efficient The utilization of solar energy in a safe, economical and environmentally friendly way has received widespread attention and attention. [0003] In order to improve the utilization rate of solar energy resources, it is necessary to use solar trackers to track the sun's rays; the method of tracking the sun mainly ado...

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Problems solved by technology

[0004] In the application document with the authorized announcement number CN2472151Y, a device for receiving sunlight by a pyramid-shaped photoelectric sensor is proposed. When the sunlight is not perpendicular to the center of the pyramid-shaped photoelectric sensor, the output voltages of the four photoelectric panels will be unequal. , as long as the voltages output by the four photoelectric panels are compared, the current sun orientation can be calculated, and then the stepper motor is controlled to drive the tracking device to track the sun; the advantage is high precision, and the disadvantage is complex structure, small tracking range and high cost , so in other types such as Fresnel and trough solar energy utilization systems, this kind of photoelectric sensor is less effective, the main reason is that it is difficult to keep the sunlight and the mirror in a perpendicular state, and the photoelectric sensor is no longer applicable

In addition, the tracker of the photoelectric tracking method is greatly affected by the weather. If the sun is covered by dark clouds for a long period of time, the sunlight often cannot shine on the receiver, resulting in the photoelectric tracking device being unable to align with the sun, or even May cause misoperation of the actuator

[0005] The tracking system of the trough solar energy utilization device mainly calculates the orbit of the sun according to the theoretical calculation formula for tracking. However, the theoretical calculation results caused by construction, installation and other problems often cannot fully meet the accuracy requirements of the system tracking, or during the operation process Accumulated errors in the process often need to be manually corrected according to on-site conditions, and the judgment of this type of correction is usually completed by naked eyes and experience, and there is no strict basis for judgment

This adversely affects the automation level of the solar thermal power generation system and improves the efficiency of the system

[0006] In the existing tracking methods, it is difficult to achieve accurate all-weather sun tracking by relying on a single open-loop or closed-loop method

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