Sunshine Energy Network: What happened to the photovoltaic power station in your after the typhoon in Tian Ge?

On August 23rd, 20 18 12: 50, typhoon 13 landed on the southern coast of Zhuhai, Guangdong, with a wind force of 14 (45 meters per second). The Central Meteorological Observatory issued the first typhoon red warning and rainstorm orange warning this year. Experts from China Meteorological Bureau said that this was the strongest typhoon that landed in China this year.

Affected by Tian Ge, the Hong Kong Observatory issued a yellow rainstorm warning and a thunderstorm warning yesterday. Shopping malls and supermarkets are closed, and schools and kindergartens are closed. The Hong Kong Stock Exchange announced yesterday that trading in the securities and derivatives markets would be suspended all day, including futures trading hours after the market closed. All securities clearing and settlement services are also suspended; The Shanghai and Shenzhen stock exchanges also suspended trading.

At about 2: 00/kloc-0: 00 on 23rd, Weibo, the official of Zhuhai Municipal Government, announced that typhoon "Tian Ge" caused two deaths and 275 houses collapsed, resulting in a total direct economic loss of 5.5 billion yuan.

Affected by the "Tian Ge", moderate to heavy rain fell in most parts of Guangdong, southern Fujian and southern Guangxi, and heavy rain fell in some areas. It is expected that there will be heavy rains in South China, Guizhou, Yunnan, Sichuan Basin and other places, heavy rains in some areas and local heavy rains, accompanied by strong winds of 7 ~ 10. Five working groups of the National Defense General are currently assisting local governments in preventing typhoons and heavy rainfall.

When building a photovoltaic power station in the southeast, we should pay special attention to the influence of bad weather such as typhoon and take targeted measures in the design, later operation and maintenance of the project power station. So how should photovoltaic power plants be protected in the typhoon season?

See how Dr. Lin from Sun Yun taught you how to prevent typhoons.

1. From the preliminary design of photovoltaic power plants, what should be paid special attention to in centralized power plants and distributed power plants respectively?

Answer: ① Ensure the building quality on which photovoltaic projects depend.

Safety factors must be considered in the design of any building. In the past, building materials and components were often very heavy, and the support capacity and earthquake risk prevention were mainly considered in the design. In recent years, with the emergence of lightweight materials, the risk of these building materials being blown away by the wind should also be considered in the design to prevent the roof from being torn by airflow.

② Improve the quality of photovoltaic modules and brackets.

From the point of view of module materials, for some special climatic and environmental areas, the choice of module backboard, frame material and packaging glass can be considered to improve the impact and seismic resistance of the module, thus improving the ability to resist special circumstances. From the point of view of power station design, while weighing the cost and power generation benefit of photovoltaic power station, the strength design requirements of photovoltaic support and module briquetting can be moderately improved, and the module inclination angle with better wind resistance can be reasonably selected.

The wind resistance of photovoltaic power plants is mostly determined by photovoltaic brackets. Photovoltaic bracket is a special bracket designed for placing, installing and fixing photovoltaic modules in photovoltaic power generation system. General materials are aluminum alloy, carbon steel and stainless steel. Theoretically, the maximum wind resistance of photovoltaic support is 2 16 km/h, and that of tracking support is 150 km/h (greater than 13 wind).

To resist the typhoon, we need a strong photovoltaic bracket first. Therefore, the photovoltaic power station must strengthen the foundation and support, and at the same time ensure the strength of the module frame. This requires targeted site selection design, strict control of product quality and reasonable calculation of wind pressure and snow pressure.

In addition, according to the geology and structure of the project site, the site selection of the power station should try to avoid areas with frequent natural disasters such as typhoons and tornadoes.

According to the local conditions, the design is carried out in strict accordance with the wind-resistant and seismic parameters of coastal buildings, and the galvanized support with strong compression resistance is selected. Wind-resistant vents should be fully considered in the array layout of photovoltaic system.

③ Improve the quality of photovoltaic design and installation.

Choose reliable designers and constructors, strictly control the construction quality, lay a good foundation, strictly control the quality of components, supports, inverters and other products, reasonably calculate the wind pressure and snow pressure, and put an end to cutting corners.

There is not much difference between centralized power station and distributed power station. The key point is to do the above.

2. Especially in the construction of distributed photovoltaic in residential areas, how to consider the impact of typhoon in the early design to reduce risks and losses?

Answer: The counterweight of household photovoltaic system is mainly cement. Cement foundation should fully consider the load of buildings to meet the requirements of wind load resistance and snow load resistance. Under normal circumstances, the design will have strict requirements on the weight of cement foundation and the strength of concrete according to the local wind pressure once every 50 years.

3. From the point of view of the later operation and maintenance of the power station, what protection should the photovoltaic power station do in typhoon season?

A: In the later operation and maintenance process, the building quality of the rooftop power station should be checked regularly to ensure the building quality on which the photovoltaic project depends. Check the strength of photovoltaic modules, photovoltaic brackets and the structure of inverter room at any time to prevent micro-persistence.

At the same time, for photovoltaic enterprises, it is necessary to improve their awareness of risk management, purchase diversified photovoltaic insurance, and correctly understand the role and value of insurance. While using insurance to transfer some risks in the industry, we should take effective measures such as quality management, operation and maintenance to reduce industry risks.

4. In terms of distributed photovoltaic, how should power station owners respond to typhoon attacks?

A: For distributed photovoltaics, before the typhoon comes, it is necessary to carefully check the quality of buildings on which photovoltaic projects depend, and check the strength of photovoltaic modules, photovoltaic brackets and other components. In addition, you can buy insurance appropriately.

In fact, the standard installed photovoltaic power station can guarantee to resist 8- 10 gale, withstand the damage of heavy rain, corrosion and other factors, and run safely and stably for more than 25 years.

Besides the quality problem of photovoltaic modules I told you yesterday, how can we resist this 8- 10 gale? You may have installed a "fake" photovoltaic power station) and there is the problem of the bracket. Let's listen to Bian Xiao's detailed analysis.

Common problems and countermeasures of photovoltaic power station

(photovoltaic bracket)

The quality of 0 1 steel support is not up to standard.

At present, there are two kinds of photovoltaic brackets: aluminum alloy and galvanized steel. However, some installers will use angle steel to reduce costs and standards, which will rust and deform after a long time, not to mention 25 years.

Aluminum alloy bracket is corrosion-resistant, light and beautiful, but its bearing capacity is not as good as that of galvanized bracket, and its cost is slightly higher.

The galvanized support has stable performance and high bearing capacity. However, the quality of galvanized stents on the market is uneven.

Good visual judgment method of galvanized support: the thickness is above 2.2mm, the surface of zinc layer is uniform, and there are no defects such as burrs, overheating, ash hanging, scars, local non-galvanizing, and zinc nodules that affect installation.

02 No lightning protection and grounding.

The frame and bracket of photovoltaic module are all made of metal and installed outdoors or on the roof. It is necessary to do a good job of lightning protection in photovoltaic power plants, which is related to the safety of people and equipment.

The aluminum alloy frame of photovoltaic module is connected with brackets, and all brackets are grounded through equipotential bonding. The grounding resistance should be less than 4Ω, and the most reliable way to connect with the grounding grid is welding, followed by crimping.

03 The bracket is not firmly connected and rusted.

When installing support columns, beams and guide rails, do not fasten the bolts in place at one time, and then fasten all the bolts after all the brackets are straightened. The joint of the two beams should not be too big, so as to avoid the pressure block just pressing on the joint, causing unstable connection. In order to make a good connection between the bracket and the roof, each connection point needs at least two chemical anchors with a diameter not less than 10 mm, and each welding point needs to be treated with antirust paint. Users can pay attention to supervising the construction team during installation.

04 Insufficient counterweight

In the configuration of photovoltaic power plants, it is very important to fully consider the load of buildings and the influence of wind, snow and temperature. However, some installers either lack basic technical ability or cut corners to reduce costs, resulting in insufficient foundation counterweight of photovoltaic power station, and the whole photovoltaic power station was overturned by the storm.