A polar-axis photovoltaic array power generation single-axis tracking device and its control method
A photovoltaic array and single-axis tracking technology, which is applied in the field of solar power generation, can solve the problems of low output efficiency of photovoltaic array power generation, failure to consider the rising of the sun, poor device tracking efficiency, etc., and achieve the effect of high cost performance, convenient control and simple device
Active Publication Date: 2021-03-09
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
Most of the existing single-axis tracking devices for photovoltaic power generation (hereinafter referred to as "device") are based on the tracking method of the horizon coordinate system, and most of them do not consider the longitude difference between the sun's rising azimuth, sunset azimuth, local longitude and time zone longitude The influence of factors such as the error between the solar time angle and the true solar time angle on the judgment of the sun's position leads to poor tracking efficiency of the device and a decrease in the output efficiency of photovoltaic array power generation; The sun altitude or azimuth angle causes the stepper motor to work continuously, which reduces the service life and increases the amount of maintenance; at the same time, due to the operation of the device and the calculation error of the formula, there is a deviation between the predicted sun position and the actual sun position
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[0039] Such as figure 1 Shown is the schematic diagram of the device in this embodiment. The rated power of the horizontal stepping motor and the vertical stepping motor are selected as 200W, the rated voltage is 50V, and the rated current is 4A. The maximum output power of the photovoltaic module installed on the device is 1000W, and the gear ratio It is 50:1; the selected photoresistor is CdS photoresistor.
[0040] Taking Shanghai at 15:00 on September 22, 2013 as an example, the control method steps are (1) set the minimum operating angle Δ = 0.1°, the error judgment time t' = 30 days, the error limit value κ = 0.2°, the local The longitude and latitude are 121.48° and 31.2° respectively, and the longitude of the location of the local standard time (i.e. the longitude of Beijing) is 116.4°. Determine the first, second, ... nth photovoltaic modules 1', 1 "……1 n The length is 1 meter, and the first, second, ... nth photovoltaic modules 1', 1" ... 1 are arranged according t...
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A single-axis tracking device and control method for polar-axis photovoltaic array power generation, which belongs to the field of solar power generation, and is characterized in that a horizontal stepping motor + worm is installed on the upper part of the longitudinal screw shaft installed on the combination of a longitudinal stepping motor + a worm reducer and an encoder Reducer and encoder combination, the two ends of the horizontal screw shaft are respectively connected with the horizontal stepping motor + worm reducer and encoder combination and the connecting frame, the lower end of each photovoltaic module is hinged with the lower end connector respectively, and the upper end passes through the upper end The connectors are respectively hinged with the connecting frame; the control method: (1) set the initial value; (2) calculate; (3) calculate, B,; (4) calculate, yes, execute (5), no, return (4 ); (5) overcast, yes, return (5), no, execute (6); (6) according to adjustment, execute (7); (7) reach, yes, execute (8), no, execute (9 ); (8) Exceeded, yes, device reset, readjust, no, execute (9); (9), yes, device stop, no, return to (9).
Description
technical field [0001] The invention belongs to the technical field of solar power generation, and in particular relates to a polar-axis photovoltaic array power generation single-axis tracking device and a control method thereof. 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 single-axis tracking devices for photovoltaic power generation (hereinafter referred to as "device") are based on the tracking method of the horizon coordinate system, and most of them do not consider the longitude difference between the sun'...
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IPC IPC(8): G05D3/12
CPCG05D3/12
Inventor 高源芷刘天保刘立群
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY