Photovoltaic power station to fight against storm 2019-09-05
Photovoltaic power station to fight against storm
Release time: 2017-11-09

In order to resist natural disasters, it is necessary to control the location, design and installation of photovoltaic power stations. After the completion of the construction of the power station, how to effectively prevent natural disasters, the role played by the later operation and maintenance can not be underestimated, the above steps can be described as interlocking and indispensable. Therefore, in the storm-prone area, the following four points should be done to build a distributed photovoltaic power station:

I. Site selection: ensuring the quality of the building

Any building must be designed with safety in mind. In the past, building materials were often heavy, and the design was mainly based on support capacity and prevention of earthquake risks. In recent years, with the advent of lightweight materials, the risk of these building materials being blown away by the wind is also considered in design, preventing the roof from being torn by the airflow.
At present, household distributed photovoltaic power plants are mainly installed on inclined roofs and flat roofs. The flat roof covers concrete flat roof, color steel flat roof, steel flat roof, ball joint roof and so on.
There are also some places to pay attention to the installation location of the PV power plant. It is necessary to consider the installation location, installation orientation, installation angle, load requirements, and arrangement and spacing. From this point of view, the location of the photovoltaic power station can not be determined by a single finger.

Mounting components on a beveled roof

Second, the design: improve the strength of the component, design the appropriate windshield

From the perspective of component materials, the choice of component backplane, frame material, and package glass can be considered to improve the anti-impact and anti-seismic properties of the components for specific climate environments, thereby improving the ability to withstand special situations. From the perspective of power plant design, while weighing the cost of photovoltaic power station and power generation, the strength design requirements of photovoltaic supports and component clamps can be appropriately increased, and the inclination of components with better wind resistance can be reasonably selected.
In addition, consider designing a suitable windshield. The wind deflector is fixedly mounted on the rear pillar of the bracket system, and the panel is provided with a plurality of air guiding ports, which have the functions of guiding the flow and reducing the wind pressure of the assembly. The beam of the bracket system is reduced in force, the pulling force of the foundation is reduced, and the safety factor of the photovoltaic power station structure is improved. However, the force on the rear pillar is increased, and the axial shear force of the foundation is increased. The foundation force is checked. In the design, fully consider the photovoltaic support, component strength and the construction of a suitable windshield, can effectively reduce the damage of strong wind to the photovoltaic power station.

Third, the installation: choose a solid support, scientific and reasonable installation

Most of the wind power capacity of photovoltaic power plants is determined by photovoltaic supports. The photovoltaic support is a special support for the placement, installation and fixing of photovoltaic modules in photovoltaic power generation systems. The general materials are aluminum alloy, carbon steel and stainless steel. In theory, the maximum wind resistance of the photovoltaic support is 216 km/h, and the maximum wind resistance of the tracking support is 150 km/h (greater than 13 winds).
But why is the bracket that claims to be able to withstand the typhoon of the thirteenth class be blown away when it encounters a wind with less than 13 winds?

Installation of non-standard PV modules

As shown in the figure, it may be because the installation company installed three rows of PV modules on the flat roof in order to save the steel, and the front and rear rows are not connected to the beam. The weight of the fixed stone pier at the bottom of the bracket is too light, and should be made into a rectangular shape. Pier weight. The above details have not been dealt with well. The typhoon is coming, and the power station is not flying!

As far as the general typhoon is concerned, it is necessary to have a strong support to fight against typhoons and heavy rain. The brackets are generally divided into two types, aluminum alloy brackets and galvanized steel brackets. If in such a place in Hainan, the typhoon is relatively frequent and the wind is large, it is better to choose galvanizing because the aluminum alloy bracket is beautiful, but the pressure resistance is not as good as that of galvanizing.

Fourth, operation and maintenance: intelligent and efficient operation and maintenance, improve risk awareness

Nowadays, new smart PV power plants in some places can generally achieve efficient operation and maintenance. This is mainly because this type of power station can monitor, operate, manage, and alarm from time, space, multi-faceted equipment and multiple dimensions, which is convenient for technical means. Prevent natural disasters.

In the later operation and maintenance process, the roof power station should be inspected regularly to ensure the quality of the building on which the photovoltaic project is based. Check the strength of the PV modules, the PV brackets, and the structure of the inverter room at any time to prevent micro-duration.
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