Control method for trough heat collection two-axis tracking structure based on polar axis coordinate system

Abstract

The invention relates to a control method for a trough heat collection two-axis tracking structure based on a polar axis coordinate system and belongs to the field of solar heat application. The control method for the trough heat collection two-axis tracking structure based on the polar axis coordinate system is characterized by including the steps of (1), setting initial values; (2), computing n and delta; (3), computing omega sr, omega ss, tss and tsr; (4), computing tz, judging whether tz> / =tsr or not, executing a step (5) if yes, and returning to the step (4) if not; (5), returning to the step (5) if it is cloudy, and executing a step (6) if it is not cloudy; (6), stopping the structure if a limit switch is touched, and executing a step (7) if the limit switch is not touched; (7), computing gamma s, adjusting alpha s and the gamma s, and executing a step (8); (8), comparing R2, R2', R2'' and R2''', judging whether R2= R2'= R2''= R2''' is true or not, if yes, keeping the alpha s and the gamma s and executing a step (13), and executing a step (9) if not; (9), judging whether R2 / = R2' / = R2'' / = R2''' is true or not, if yes, adjusting the alpha s and the gamma s sequentially and executing the step (13), and executing a step (10) if not; (10), judging whether R2= R2' / = R2''= R2''' is true or not, if yes, adjusting the alpha s and executing the step (13), and executing a step (11) if not; (11), judging whether R2= R2'' / = R2'= R2''' is true or not, if yes, adjusting the gamma s according to the S and executing the step (13), and executing a step (12) if not; (12), seeking Rmin, adjusting the alpha s and the gamma s sequentially and executing the step (13); (13) judging whether delta t is terminated or not, executing a step (14) if yes, and returning to the step (13) if not; (14), judging whether tz> / =tss or not, stopping the structure if yes, and executing the step (5) if not.

Description

technical field [0001] The invention belongs to the technical field of solar heat application, and in particular relates to a control method of a trough heat collecting biaxial tracking structure. Background technique [0002] At present, the development and utilization of renewable energy has been increasingly concerned by the governments of various countries, and the conversion of solar energy into thermal energy through vacuum collectors has great development potential in the near future. According to the forecast of the EU Joint Research Center in 2004, by the end of this century, the application of solar energy will exceed 70% of the world's energy supply. Most of the existing trough heat collector dual-axis tracking structures (hereinafter referred to as "structures") are based on the dual-axis tracking method of the horizon coordinate system, and most of them do not consider the azimuth of the sun's rising azimuth, sunset azimuth, local longitude and time zone longitu...

AI Technical Summary

Problems solved by technology

Most of the existing trough heat collector dual-axis tracking structures (hereinafter referred to as "structures") are based on the dual-axis tracking method of the horizon coordinate system, and most of them do not consider the azimuth of the sun's rising azimuth, sunset azimuth, local longitude and time zone longitude The influence of factors such as the longitude difference between the sun and the error between the solar time angle and the true solar time angle on the judgment of the sun position leads to poor structure tracking efficiency and a decrease in output efficiency; in addition, partial shading is not considered, resulting in a decrease in structure output efficiency ; At the same time, there is a deviation between the predicted sun position and the actual sun position due to structural operation and formula calculation errors

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