Control method for photovoltaic power generation double-axis tracking system

A technology of dual-axis tracking and control method, applied in the field of solar power generation

Inactive Publication Date: 2014-05-21
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to system mechanism operation and formula calculation errors, there is a deviation between the predicted sun position and the actual sun position, so it is necessary to study and provide a control method to reduce the deviation between the predicted sun position and the actual sun position

Method used

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  • Control method for photovoltaic power generation double-axis tracking system
  • Control method for photovoltaic power generation double-axis tracking system
  • Control method for photovoltaic power generation double-axis tracking system

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Embodiment Construction

[0047] Now the selected system stepper motor has a rated power of 200W, a rated voltage of 50V, and a rated current of 4A. The maximum output power of the photovoltaic modules installed on the system is 1000W, and the gear ratio is 50:1; the selected photoresistor is CdS photosensitive resistance.

[0048] Taking Shanghai at 15:00 on September 22, 2013 as an example, the control method steps are (1) The minimum operating angle △ and each operating interval △t are set to 0.1° and 5 minutes respectively, and the local longitude and latitude are respectively 121.48° and 31.2°, the longitude of the local standard time (ie Beijing's longitude) is 116.4°, perform step (2); (2) determine that September 22 is the 266th day of the year, the calculated solar declination When the angle is -0.8966°, perform step (3); (3) Determine that the sunrise and sunset angles on September 22 are -89.5° and 89.5°, and the sunrise and sunset times are 6.03 and 17.97 hours, respectively. Step (4); (4) Th...

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Abstract

The invention discloses a photovoltaic double-axis tracking system and a control method, which belong to the technical field of solar power generation. The photovoltaic double-axis tracking system is characterized in that four photoresistors are installed on the upper support of the original double-axis tracking system. The control method comprises the following steps of: (1) setting an initial value; (2) calculating n and 8; (3) calculating Omega sr, Omega ss, tsr and tss; (4) calculating tz, judging whether tz is greater than or equal to tsr, if so, executing (5), or else, returning to (4); (5) judging whether the weather is cloudy, if so, returning to (5), or else, executing (6); (6) calculating Alpha s and Nu s, and adjusting S Alpha and S Nu; (7) comparing four resistances, judging whether the equation R9=R10=R11=R12 is met, if so, keeping S Alpha and S Nu, and executing (12), or else, executing (8); (8) judging whether the inequality R9=/R10=/R11=/R12 is met, if so, sequentially adjusting S Alpha and S Nu, executing (12), or else, executing (9); (9) judging whether the inequality R9=R10=/R11=R12 is met, if so, adjusting SAlpha, and executing (12), or else, executing (10); (10) judging whether the inequality R9=R11=/R10=R12 is met, if so, adjusting SNu, and executing (12), or else, executing (11); (11) searching the minimum resistance Rmin, and sequentially adjusting SAlpha and SNu; (12) judging whether Delta is concluded, if so, executing (13), or else, returning to (12); (13) judging whether tz is greater than or equal to tss, if so, stopping the system; or else, executing (5).

Description

Technical field [0001] The invention belongs to the technical field of solar power generation, and specifically relates to a control method of a photovoltaic power generation dual-axis tracking system. Background technique [0002] At present, the development and utilization of renewable energy has attracted the attention of governments of various countries. In the near future, the conversion of solar energy into electric energy through photovoltaic has great development potential. According to the forecast of the European Union Joint Research Center in 2004, by the end of this century, the ratio of photovoltaic power generation in the entire world's energy supply will exceed 30%. Most of the existing photovoltaic power generation systems adopt a fixed installation of photovoltaic modules. This structure can only ensure that the solar light is irradiated to the photovoltaic modules at an optimal angle on a certain day of the year, so the utilization rate of sunlight is relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D3/12G05B13/04
Inventor 刘立群张国梁田行葛竹曹亮刘春霞
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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