Calibration system and calibration method for heliostat of solar generating station

Abstract

A calibration system for a heliostat in a solar power station and a calibration method thereof. The calibration system comprises: a receiver (1); a heliostat field mounted around the receiver (1); an image sensor group for capturing and calibrating a reflected light spot irradiated on a heliostat (2) by a light source; and a control unit. The image sensor group is movably arranged between the receiver (1) and the heliostat field. A reflected image of the heliostat (2) to be calibrated at least partially falls in a collection range of the image sensor group. The control unit obtains, according to image information of the image sensor group, a central position of a light spot reflected by the heliostat (2), so as to finally obtain an error value required for calibration of the heliostat (2). In the calibration system, the image sensor group moves to determine the central position of the reflected light spot of the heliostat, the calibration action is quick, the mechanical error is small, and the calibration accuracy is improved.

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

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