With the depletion of energy and the increasingly serious environmental problems, solar photovoltaics, as a clean and environmentally friendly green energy, are the foundation of the future renewable energy structure. Photovoltaic power generation systems have two modes of operation: off-grid and grid-connected. Next, what is the detailed introduction of photovoltaic grid-connected power generation system?
First, the principle of photovoltaic intelligent tracking system
The principle of the photovoltaic tracking system is actually very easy to understand, because the irradiation angle of the sun is always changing, and the tracking technology is applied to the traditional fixed photovoltaic panels, it will not be fixed on a On the contrary, it will change with the change of the sun like a sunflower, which will increase the solar radiation energy and further promote the overall power generation of the power station.
2. What is the photovoltaic intelligent tracking system
Because of the autobiographical movement of the earth, compared with the fixed solar photovoltaic power generation system, the sun rises and sets every day in spring, summer, autumn and winter, and the illumination angle of the sun changes all the time, only effective guarantee Solar panels can always face the sun to ensure that the power generation efficiency reaches a suitable state.
At present, the photovoltaic intelligent tracking system calculates the angle of the sun at different times of each day based on the longitude and latitude of the placement point and other information, and stores the sun position at each moment of the year to In PLC, single chip microcomputer or computer software, it means to achieve tracking by calculating the position of the sun.
Computer data theory needs to be based on the data and settings of the latitude and longitude area of the earth. After installation, it is inconvenient to move and disassemble. After moving the original data and parameters, it has to be reset. The principle, technology, circuit, and equipment are all complex, and the operation needs to be carried out by professionals.
Three, the advantages of photovoltaic intelligent tracking system in power generation
Affected by the rotation of the earth, a fixed point on the earth rotates with the sun's cycle throughout the year, resulting in the constant change of the illumination angle. The installation of photovoltaic tracking system is to maintain the change of solar panels with the change of the sun, increase the amount of solar radiation received by the photovoltaic array, and further increase the overall power generation of the solar photovoltaic power generation system.
According to the adjustment angle of the bracket, the photovoltaic tracking system can be divided into three categories, namely flat single-axis, inclined single-axis and dual-axis trackers. According to the calculation, the double shaft can increase the power generation by 40%, the inclined single shaft can increase the power generation by 20%-25%, and the flat single shaft can increase the power generation by 10%-20%. Among them, the reliability risk of flat uniaxial is relatively low, while the risk of inclined uniaxial and biaxial is relatively high.
From the perspective of the comprehensive cost performance of the three products of flat single axis, inclined single axis and dual axis tracking system, the flat single axis has more advantages.
China has a vast territory and complex and diverse climatic conditions. Different regions adopt different photovoltaic intelligent tracking systems, and the proportion of increased power generation varies greatly. In general, the higher the latitude, the better the light conditions, and the greater the percentage of improvement: in most areas within 25° north latitude, the increase in power generation is less than 30%; while in the northwest, where the north latitude is above 35° to 40° north latitude, the light conditions are better. In the region, the power generation can be increased by 35% to 40%.
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