Safety Analysis of Buoy Mounting System for PV
With the development of photovoltaic industry, the land used for the construction of photovoltaic power stations is becoming more and more scarce. At the same time, in view of the problems restricting the power grid consumption and transmission and distribution of photovoltaic power generation, various forms of photovoltaic power generation have appeared in the industry, which is different from the traditional floating photovoltaic power station
on water surface (i.e. fishery photovoltaic complementary power station), and the floating system
has also begun to take shape. In 2017, there have been several large-scale floating photovoltaic power stations on water surface in China is completed, which mainly uses HDPE floating body for photovoltaic. This news will briefly introduce the buoy mounting system for floating PV, which is one of the newest floating pv mounting systems
, and explain its safety requirements.
The floating power station mainly considers the local power grid consumption, and with the help of the water conservancy power generation medium and high voltage transmission equipment around the reservoir, it can effectively reduce the access cost. At the same time, from the construction point of view, the traditional surface power station needs to drive the support pile into the bottom of the water, which is very difficult for the deep water area. Therefore, the floating method is adopted to reduce the influence of water depth on the installation difficulty.
For the photovoltaic power station composed of HDPE floating body, this type of floating body mainly includes the following parts: main floating body, aisle floating body, component connector and anchoring system. The main floating body is used to fix the components, while the aisle floating body is used to connect the main floating body. This type of floating body will not adopt the form of rigid connection.
For HDPE floating body, the main production method is blow molding. That is to use the fixed mold to blow the floating body at one time. From the perspective of safety, the following aspects should be paid attention to:
1. Weather resistance
As HDPE floating body will be used in outdoor water surface for a long time, its weather resistance will directly affect the safety of the whole photovoltaic power station. In view of this content, it is suggested to carry out specific aging test for the floating body, including damp heat aging test and ultraviolet aging test. The specific environmental parameters can refer to the specific standards of corresponding items in IEC61215, and the tensile fracture stress of products before and after the test is compared Retention rate, which can refer to the specific provisions in GB / T1040.2.
2. Basic performance
The basic performance of floating body mainly includes the following aspects:
1) The buoyancy of the floating body can be calculated based on the size and weight of the components carried by the buoy.
2) Refer to the specific requirements in GB/T 1040.2 for the retention rate of tensile fracture stress.
3) Air tightness. It is to ensure that the floating body will not hesitate to appear air tightness problems when the thermal barrier shrinks.
4) The specific requirements of flame retardant new energy GB/T 2408 can be referred to for fire performance.
3. Environment-friendly type
The floating body will be directly put into the water body, which shall not affect the water environment. In this part, the relevant contents of IEC62321 standard can be referred to for the relevant inspection and verification of the floating body materials.