Calibration system and calibration method for heliostat of solar generating station

Abstract

The invention discloses a calibration system for a heliostat of a solar generating station, which comprises a receiver, a heliostat field, an image sensor group and a control unit, wherein the heliostat field is arranged at the periphery of the receiver; the image sensor group is used for capturing a reflecting light spot radiated by a calibration light source onto the heliostat; the image sensor group can be movably arranged between the receiver and the heliostat field; at least one part of a reflecting image of the heliostat to be calibrated falls within the acquisition range of the image sensor group; and the control unit is used for acquiring the central position of the light spot reflected by the heliostat according to image information of the image sensor group and finally obtaining an error value of the heliostat to be calibrated. According to the calibration system disclosed by the invention, the central position of the reflecting light spot of the heliostat is determined by the movement of the image sensor group; and the calibration system has the advantages of high calibration speed, small mechanical error and improved calibration precision. The invention also discloses a calibration method of the calibration system.

Description

technical field [0001] The invention belongs to the field of solar power generation, and in particular relates to a heliostat calibration system and a tracking method of a solar power station. Background technique [0002] In a central tower receiver power plant, the receiver on top of the tower receives sunlight reflected from the heliostat array. The receiver converts the incident radiant energy to output high-pressure, high-temperature steam, which can then be sent to a turbine for electricity generation. Heliostats are generally installed on the ground around the tower. Each heliostat has a rigid reflective surface to track the sun, and the surface is oriented to the sun during the day to keep reflecting moving sunlight to the receiver. Highly accurate tracking of the sun is required to reduce reflected light spilling around the receiver. Therefore, providing a heliostat calibration system capable of accurately tracking the sun and achieving less loss has become an ur...

AI Technical Summary

Problems solved by technology

The control scheme is complicated, and the calibration process is complicated; at the same time, the multiple trajectory rotations of the heliostat introduce mechanical errors, and the calibration accuracy is reduced

In addition, in larger power plants, the rotation of a large number of heliostats consumes power from the calibration motors that control the rotation of the heliostats

As another example, in US Patent US20100139644, although the rotation track of the heliostat is simplified compared with CN101918769A during calibration, in order to obtain the contour position of the reflected spot of the heliostat, the control system still needs to control a large number of heliostats to rotate until the camera can capture In this way, the reflected light spot of the heliostat cannot be irradiated on the receiver, which affects the power generation efficiency

Images