Tracking and controlling system and tracking method for heliostat

Abstract

The invention provides a tracking and controlling system and a tracking method for a heliostat. The tracking and controlling system comprise a dual pitch heliostat, a biaxial tilt angle sensor, a machine vision initial error correction system and a host control system, wherein the biaxial tilt angle sensor is used for measuring the real-time tilt angles between the north-south dimensionality and the east-west dimensionality of the mirror plane of the dual pitch heliostat and the horizontal plane; the machine vision initial error correction system is used for correcting the initial mounting error of the biaxial tilt angle sensor; vectors of a solar incident ray in a certain time and a local place are calculated according to the sun position algorithm; theoretical east-west and north-south tilt angles of the dual pitch heliostat relative to the horizontal plane are calculated according to the geometric tracking algorithm; difference valves between the theoretical tilt angles and actual tilt angles, fed back by the biaxial tilt angle sensor, of the dual pitch heliostat are obtained by comparing the theoretical tilt angles with the actual tilt angles; a motor is driven to rotate by an on-site controller of a controlling device according to the difference values; when the difference values are zero, the motor stops rotating, and the tracking is accomplished.

Description

technical field [0001] The invention relates to a heliostat tracking control system and a heliostat tracking method for tower-type solar thermal power generation. Background technique [0002] The heliostat is the concentrating device of the tower-type solar thermal power generation system, which is in charge of the front-end energy supply of the entire tower-type power station. Generally, it is driven by two axes. The heliostat reflects and gathers sunlight to a fixed target in real time. [0003] There are two main two-axis drive methods for heliostats, namely azimuth-pitch heliostats and spin-pitch heliostats. Conventional azimuth-elevation heliostats use motor pulses or encoder pulses combined with the initial position angle to indirectly calculate the real-time inclination angle of the double-elevation heliostat mirror. The disadvantage is that the accuracy is not high and the pulse is lost after power failure, so it needs to be reset to recalculate the inclination angl...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of high cost caused by extremely high performance requirements of the motor and reducer in the existing heliostat tracking control system, and the defect that the tracking accuracy of the control method is difficult to guarantee after long-term operation, and provide a set of low-cost, High-precision heliostat tracking control system and heliostat tracking method

The present invention adopts the collocation of double-pitch heliostats and dual-axis inclination sensors to overcome the problems of low precision and high cost in previous heliostat tracking; the addition of dual-axis inclination sensors forms a tracking closed loop, which simplifies the correction operation, and at the same time It overcomes the problem that the traditional open-loop tracking method requires a large amount of correction work and poor results, and has extremely high practical value

Images