Passing point control method based on double-axis photovoltaic tracking system

Abstract

The invention discloses a passing point control method based on a double-axis photovoltaic tracking system. According to the passing point control method based on the double-axis photovoltaic tracking system, whether passing point tracking is conducted or not is determined by comparing the position of the track of the sun and the track of a double-axis photovoltaic tracking device, it is indicated that the position of the tracking device is left behind by the track S1 of the sun when the elevating angle (S0H) or the azimuth angle (S0W) of the tracking device is smaller than the corresponding elevating angle (S1H) or the corresponding azimuth angle (S1W) of the track of the sun, namely, S0H-S0H>M1, SW-GW>M2, (M2 is the tracking threshold value of passing point tracking), and the tracking device is controlled to conduct tracking for the distance of 2M along the moving track of the sun at the moment so that the tracking device can be in front of the actual position of the sun by M. Due to the fact that the sun moves along the fixed track, the difference between the position of the tracking device and the position of the sun is firstly reduced to 0 from M and then is increased to M from 0, and the steps are executed again when the sun is in front of the tracking device by the distance of M. According to a double-axis photovoltaic tracking power generator adopting the passing point control method, the annual average electric energy production can be increased by 0.05%.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a point-over control method based on a biaxial photovoltaic tracking system. Background technique [0002] Solar energy, as a clean energy source with no geographical restrictions on resources, is bound to become one of the important energy sources to support national construction in the future. Among them, the technology of solar photovoltaic utilization, that is, the direct conversion of sunlight into electrical energy through photovoltaic devices, has been relatively mature after decades of development, but in actual operation, the photoelectric conversion efficiency of photovoltaic devices has always been low, and its production cost, land cost and other factors Restrict its more rapid development. [0003] At present, the domestic dual-axis photovoltaic tracking system has developed rapidly in recent years. The research and development purpose o...

AI Technical Summary

Problems solved by technology

But at present, the tracking mode of domestic biaxial photovoltaic products is relatively passive, and its tracking mode is when the position of the sun is S 1 The position S of the leading tracker 0 When, S 1 -S 0 > Μ, the tracker then drives the journey of Μ to catch up with the sun. However, during the process of the tracker driving and catching up, the position of the sun changes again. Only when the range of change reaches a certain range, the tracker starts to track. The solar altitude angle and azimuth angle are also changing during the fine-tuning period of the axis photovoltaic system tracker. Therefore, it is theoretically impossible to achieve zero-error tracking in this tracking mode, so that the solar panels cannot be perpendicular to the sun's rays. This will inevitably result in a loss of power generation

Images