Control method for dual-axis tracking structure of photovoltaic power generation based on polar axis

Abstract

A polar-axis-based control method for a biaxial tracking structure of photovoltaic power generation, which belongs to the technical field of solar power generation, is characterized in that the structure control method is: (1) setting an initial value; (2) calculating n and δ; ( 3) Calculate ωsr, ωss, tss, tsr, ΔB; (4) Calculate tz, tz≥tsr, yes, execute (5), no, return to (4); (5) cloudy, yes, return to (5), No, execute (6); (6) touch the limit switch, yes, the structure stops, no, execute (7); (7) calculate γs, adjust αs, γs, execute (8); (8) compare R2, R2', R2 ", R2 "', R2=R2'=R2 "=R2 "', yes, keep αs, γs, execute (13), no, execute (9); (9) R2≠R2'≠R2 "≠R2"', yes, adjust αs, γs in turn, execute (13), no, execute (10); (10) R2=R2'≠R2"=R2"', yes, adjust αs, execute (13) , No, execute (11); (11) R2=R2"≠R2'=R2"', yes, adjust γs in combination with S, execute (13), no, execute (12); (12) find Rmin, adjust in turn αs, γs, execute (13); (13) Δt ends, yes, execute (14), no, return to (13); (14) tz≥tss, yes, stop the structure; no, execute (5).

Description

technical field [0001] The invention belongs to the technical field of solar power generation, and in particular relates to a control method of a polar axis-based photovoltaic power generation dual-axis 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 electrical energy through photovoltaic modules 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 proportion of photovoltaic power generation in the world's energy supply will exceed 30%. Most of the existing dual-axis tracking structures for photovoltaic power generation (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 solar rising azimuth, sunset a...

AI Technical Summary

Problems solved by technology

Most of the existing dual-axis tracking structures for photovoltaic power generation (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 solar rising azimuth, sunset azimuth, local longitude and time zone longitude. The longitude difference, the error between the solar time angle and the true solar time angle and other factors affect the judgment of the sun position, resulting in poor structure tracking efficiency and a decrease in the output efficiency of photovoltaic power generation structures; in addition, the dual-axis tracking method based on the horizon coordinate system is due to To keep track of the sun's altitude and azimuth, the two stepper motors work continuously, which reduces the service life and increases the amount of maintenance; at the same time, due to structural operation and formula calculation errors, there is a deviation between the predicted sun position and the actual sun position

Images