研究目的
To develop a fast automatic calibration system for heliostats in solar plants to maintain high efficiency of the solar field by compensating for drift or other deviations over time.
研究成果
The method allows for the parallel determination of the individual kinematic models and facet orientation for a field of heliostats with high accuracy, achieving an overall error accuracy of about 0.6 mrad. Future work includes integrating this method into the control of the heliostat and testing it for a series of heliostats.
研究不足
The method's accuracy is affected by uncertainties in target positions and difficulties in estimating the facet orientation with respect to the camera orientation. The use of multiple activated targets in parallel can cause misdetections.
1：Experimental Design and Method Selection:
The method uses cameras attached to each heliostat and artificial infrared targets distributed throughout the solar field to calibrate the heliostat field.
2：Sample Selection and Data Sources:
The EASY heliostat prototype at the Plataforma Solar de Almeria (PSA) was used for testing.
3：List of Experimental Equipment and Materials:
A 5Megapixel CMOS camera with an IR bandpass filter, remotely controllable IR light sources as targets, and a laser scanner for measuring target positions.
4：Experimental Procedures and Operational Workflow:
The heliostat was moved in a grid pattern to observe different targets, with each target captured multiple times under different heliostat angles.
5：Data Analysis Methods:
The kinematic model parameters were estimated by minimizing the error between detected and estimated target positions in the camera images.
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