Azimuth-elevation tracking method of heliostat with reflecting mirror surface deviated from rotating center

Abstract

The invention relates to an azimuth-elevation tracking method of a heliostat with a reflecting mirror surface deviated from a rotating center, which comprises the following steps: firstly calculating the accurate normal of the mirror surface center of the heliostat, and then calculating the tracking azimuth angle and the tracking elevation angle of the heliostat under the condition that an elevation rotating shaft is parallel to the tangent plane of the mirror surface center; measuring unit target vectors, measuring the inclination angles psit and psia of the azimuth rotating shaft of the heliostat, measuring the non-orthogonal deflection angle tau1 of the two rotating shafts, calculating a certain moment of a unit sun position vector at any moment at daytime of a local place, rotating the heliostat to enable the reflected solar faculae to be just positioned at the center of a focusing target surface, i.e. the center of the faculae is aligned with the center of the focusing target surface, and determining the tracking azimuth angle and the tracking elevation angle corresponding to an initial reference position of the heliostat rotating along the shaft by comparing the current tracking azimuth angle and the tracking elevation angle with the respectively rotated angles of the heliostat from the initial reference position to a current position recorded by an azimuth rotation encoder and an elevation rotation encoder.

Description

Technical field The invention relates to a tracking method of a heliostat, in particular to an azimuth-pitch biaxial tracking method of a heliostat. Background technique The heliostat is a concentrating device in the solar tower concentrating system. It reflects and concentrates sunlight to a fixed target through a dual-axis tracking mechanism. The heliostat includes five parts: mirror, support frame, column, two-axis transmission mechanism and tracking control system. Azimuth-pitch tracking is the most common dual-axis tracking method for heliostats. The azimuth rotation axis (vertical axis) of the heliostat is fixed and coincides with the axis of the heliostat column; the pitch rotation axis (horizontal axis) and the azimuth rotation axis are fixed. It is vertical, connected with the heliostat support structure and fixed on the support structure, and rotates around the azimuth rotation axis together with the support structure of the heliostat and the reflecting mirror. In p...

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