Solar tracking system, the industry leader

Publish Time:2021-12-21 Sources:garcesolar

After decades of rapid development, the photovoltaic industry has made tremendous progress in both technology and economy. Promoting the reduction of the kWh cost of photovoltaic systems and achieving equal access to the Internet as much as possible has become a key factor restricting the sustainable development of photovoltaic power generation. When the manufacturing costs of components, inverters, brackets and other equipment are reduced, the conversion efficiency of components is gradually improved, and indirect costs such as land and taxes increase, how to maximize the total power generation of the photovoltaic system throughout the life cycle has become the most important way to reduce the cost of photovoltaic systems. One of the effective methods.

Solar tracking system

"Solar energy has the problems of low density, intermittentness, lighting direction and intensity changes over time. Traditional photovoltaic systems mostly adopt fixed installation modes, and solar panels cannot change with the position of the sun, resulting in the module's photoelectric conversion efficiency that does not meet expectations. According to calculations If there is a 25° deviation between the power generation system and the sunlight angle, the output power of the photovoltaic array will be reduced by about 10% due to vertical incidence. The photovoltaic tracking system can make solar panels such as "sunflowers" chase the sun at any time, increasing the amount of energy received by the photovoltaic array Solar radiation, thereby greatly increasing the overall power generation capacity of the solar photovoltaic power generation system."

It is understood that the tracking system is divided into flat single-axis tracking system, inclined single-axis tracking system, dual-axis tracking system, single-pillar inclined single-axis tracking system, inclined flat single-axis tracking system, etc.

The component grid of the flat-panel single-axis tracking system rotates the horizontal center axis around the axis, so that the sunlight shines on the single-axis tracking support system of the component as vertically as possible. The planar single-axis tracking system with an inclination angle rotates around the horizontal central axis, and the components are installed obliquely; the inclined single-axis tracking system is a single-axis tracking support system in which the component grid rotates around the inclined central axis. It has adaptive complementary tracking function, high tracking accuracy, and can significantly improve the photoelectric conversion efficiency of the system; the component grid of the dual-axis tracking system rotates around two central axes, and has a weightlifting structure and five-point support. The "field-shaped" structure is combined with the four-bar structure, and the rotation is driven in the pitch direction to eliminate the effect of water waves, prevent the impact of wind on the grid during operation, eliminate vibration, and ensure efficient power generation by the battery module.

"The selection principle of the tracking system is that the solar altitude angle in low latitude areas is relatively high, and the modules should be placed horizontally, which can significantly improve the power generation efficiency; the solar altitude angle in high latitude areas is relatively low, and the power generation efficiency after installation of the modules is relatively low. Insufficiency of the low horizontal direction, the power generation after the module is placed obliquely increases greatly. Therefore, it is more suitable to use flat uniaxial and flat uniaxial tilt in low latitude areas, and it is more suitable to use inclined uniaxial, dual axis, and flat uniaxial in high latitude areas. Axis tilt, single column tilt single axis. For example, in Zhangbei, the use of tilt single axis tracking system can increase power generation by 29%, and the use of flat single axis tracking system can increase power generation by 15%; however, in the south, through the use of The flat single-axis tracking system can increase power generation by more than 20%."

According to statistics, the excellent performance of the photovoltaic tracking system can increase the power generation of photovoltaic power plants by 20% to 30%, which has become the main way for global photovoltaic power plants to reduce costs and increase benefits. According to a set of tracking system data shared by photovol, single-axis horizontal tracking, single-axis tracking latitude angle, and dual-axis high-precision tracking can increase the revenue of power generation by 23.1%, 32.3%, and 36.9%.

At present, the era of photovoltaic tracking systems has arrived. The population is becoming more and more dense, and the land available for photovoltaic power generation is decreasing. Distributed photovoltaic power generation is becoming more and more popular in industrial parks, rooftops and small projects. The system adopts distributed photovoltaic system to improve power generation capacity. In the past, only a straight single axis could be used on a certain slope of the ground, but in our Huangshan Park, the inclined single axis used for climbing has been successfully tested. This is very good news for customers. The future prospects of dual-axis trackers are also very good. At present, it is generally believed that the cost of a dual-axis tracker is relatively high. In fact, this is a one-sided understanding. Although the initial investment cost of the dual-axis tracker is relatively high, the additional power generation is very obvious, which can guarantee a 25-year service life.

Although the situation is good, there are still some problems with the tracking system itself that need to be resolved. First, the problem to be solved is to reduce the cost of the tracking system. Only in this way can we meet the needs of large-scale commercial projects. Steel is the biggest cost factor limiting the tracking system. The current increase in domestic steel prices has brought great difficulties to the development of the tracking system. We are actively carrying out technological transformation, and the ultimate goal is to digest steel costs. In addition, another difficulty of the tracking system is that it must be designed according to the specific situation. The market has higher and higher requirements for the integration of design and construction of the tracking system, which also puts forward higher requirements for us. Power station design should consider many factors, including power generation improvement, land cost, construction cost, stability, component selection, etc.