Control method of polar-axis-based photovoltaic power generation double-axis tracking structure

Abstract

The invention provides a control method of a polar-axis-based photovoltaic power generation double-axis tracking structure, and belongs to the technical field of solar power generation. The invention is characterized in that the control method of the polar-axis-based photovoltaic power generation double-axis tracking structure comprises (1) setting an initial value, (2) calculating n and delta, (3) calculating w<sr>, w<ss>, t<ss>, t<sr> and [delta]B, (4) calculating t<z>, if t<z>>=t<sr>, a step (5) is executed, otherwise the step (4) is returned to, (5) if weather is cloudy, the step (5) is returned to, otherwise a step (6) is executed, (6) if a limit switch is touched, the structure is stop, otherwise a step (7) is executed, (7) calculating [gamma]<s>, [alpha]<s> and [gamma]<s> are adjusted, and a step (8) is executed, (8) R<2>, R<2>', R<2>'' and R<2>''' are compared, if R<2>= R<2>'= R<2>''=R<2>''', the [alpha]<s> and the [gamma]<s> are kept, and a step (13) is executed, otherwise a step (9) is executed, (9) if the R<2> is not equal to the R<2>', the R<2>' is not equal to the R<2>'', and the R<2>'' is not equal to the R<2>''', the [alpha]<s> and the [gamma]<s> are successively adjusted, and the step (13) is executed, otherwise the step (10) is executed, (10) if the R<2> is equal to the R<2>', the R<2>' is not equal to the R<2>'', and the R<2>'' is equal to the R<2>''', the [alpha]<s> is adjusted, and the step (13) is executed, otherwise a step (11) is executed, (11) if the R<2> is equal to the R<2>'', the R<2>' is not equal to the R<2>'', and the R<2>' is equal to the R<2>''', the [gamma]<s> is adjusted through combination with S, and the step (13) is executed, otherwise a step (12) is executed, (12) an R<min> is searched, the [alpha]<s> and the [gamma]<s> are successively adjusted, and the step (13) is executed, (13) if [delta] is ended, a step (14) is executed, otherwise the step (13) is returned to, and (14) if t<z>>= t<ss>, the structure is stopped, otherwise the step (5) is executed.

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

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