Optimal tracking method for photovoltaic tracking system based on similar day irradiation prediction

Abstract

The invention discloses an optimal tracking method for a photovoltaic tracking system based on similar day irradiation prediction. The method comprises the following steps of acquiring meteorologicalparameters of the next day, which are forecasted by a meteorological station, as basis vectors, selecting historical meteorological parameter vectors with the same weather phenomena of N days, and selecting k vectors nearest to the basis vectors through a k-nearest-neighbor method in order to compute horizontal-plane total irradiation and surface normal direct irradiation of the next day; computing direct and scattering irradiation distribution of the surface of the photovoltaic tracking system through a pre-determined tracking strategy of the photovoltaic tracking system, a geometrical relationship of the sun, the tracking system and the ground, and a scattering irradiation model; and finally, comprehensively evaluating the generating capacity and the electricity consumption of the photovoltaic tracking system, and the generating capacity of the photovoltaic systems with the optimal inclination angle installation and horizontal installation, and selecting an optimal operation mode ofthe next day. According to the method, the generating capacity difference in different installation modes of a measuring place can be computed and compared, the generating capacity and the electricityconsumption of the photovoltaic tracking system are balanced, and the photovoltaic tracking system operation mode with the optimal power generation cost is obtained.

Description

technical field [0001] The invention relates to an optimal tracking method for a photovoltaic tracking system based on similar day radiation prediction, and belongs to the technical field of solar photovoltaic system applications. technical background [0002] At present, the main methods to improve the efficiency of photovoltaic power generation systems are: improving battery efficiency, adopting maximum operating power point tracking technology, developing new photovoltaic modules, and sun tracking. But in the short term, it is difficult for the first three to make major breakthroughs, so for concentrated photovoltaic systems, sun tracking has more important significance. Existing photovoltaic tracking technology can accurately track the position of the sun, but under cloudy and overcast conditions, photovoltaic tracking may not be able to increase additional power generation revenue for photovoltaic systems and photovoltaic trackers will generate additional power loss. T...

AI Technical Summary

Problems solved by technology

But in the short term, it is difficult for the first three to make a big breakthrough, so for concentrated photovoltaic systems, sun tracking has more important significance

Existing photovoltaic tracking technology can accurately track the position of the sun, but under cloudy and overcast conditions, photovoltaic tracking may not be able to add additional power generation revenue to the photovoltaic system and the photovoltaic tracker will generate additional power loss

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