Wind tunnel test of 182210 modules by Baowei photovoltaic bracket without fear of typhoon

Recently, Typhoon Fireworks with a wind force of 13 landed in Zhejiang, and the disaster it brought became the focus of the whole country. In recent years, such extreme weather (strong winds, heavy rains, heavy snow, etc.) has brought unprecedented challenges to the operation of photovoltaic power stations. As the size of mainstream photovoltaic modules has become larger, the support system is particularly important for the safety and life of the entire power station.

2017 Category 16 Super Typhoon "Hato" landed

Purpose

To this end, Baowei New Energy conducted wind tunnel tests on the current mainstream 182mm and 210mm large-size and extra-large-size components to verify the safety performance of the bracket system for different components under dynamic wind loads and destructive tests.

experiment

This experiment selected 182 modules (2384×1303mm) and 210 modules (2256×1133mm) for testing. In this test, Baowei New Energy directly selected the mass production project bracket, DuoPower high-strength steel structure double-column bracket system.

This system uses double round steel tube columns, and there are support rods on the sides and rear of the bracket. To ensure the fairness and accuracy of the test, both 182mm and 210mm components are installed in strict accordance with their respective product installation manuals, using crossbeam bolt installation, and the component manufacturer and certification agency confirm on-site at the same time.

The laboratory can provide destructive experiments with test wind speeds ranging from 0 to 60 meters per second (216 kilometers per hour), and the actual maximum wind speed can reach 90 meters per second (greater than 300 kilometers per hour) in the actual environment.

In the interim test results, Baowei's photovoltaic brackets and components did not suffer obvious damage at a wind speed of 62m/s. According to the wind force level standard, when the wind speed exceeds 62m/s, it reaches level 17; and according to the China Meteorological Administration's national standard "Tropical Cyclone Level", when the wind force ≥ level 16, it is defined as a super typhoon.

The wind tunnel test data provided accurate load data under different conditions, verifying the strength of the Baowei New Energy support system structure. It also shows that the Baowei multi-column support system is sufficient to ensure the safety of 182/210 modules in super typhoon weather, and effectively ensure the safe and stable operation of photovoltaic power stations in coastal areas and desert areas under extreme windy weather.

Examples

In the summer of 2017, Super Typhoon Hato hit the coast of South China head-on. When Hato landed in Zhuhai, Guangdong, the maximum wind speed reached 48m/s and the wind force reached level 15.

In strong winds, photovoltaic modules will be damaged by wind pressure and vibration, and even blown away by strong winds. Therefore, in high wind speed areas, excellent photovoltaic brackets are particularly important for the safety of power stations. During the landing of Typhoon Hato, all of Baowei's photovoltaic projects in Guangdong were safe and sound, and the power stations have been operating smoothly. Baowei photovoltaic bracket products can be said to be the "stabilizing force" in this wind disaster.

After Typhoon Hato丨Baowei Zhuhai Project

Why Wind Tunnel Testing?

The IEC standard is a photovoltaic module performance and safety test specification commonly used by photovoltaic laboratories around the world. ASCE SEI 49 is the wind tunnel test standard specification in the United States.

Among them, the dynamic mechanical load test IEC TS 62782 standard is used to evaluate the ability of photovoltaic modules to withstand dynamic loads and to simulate the effects of fatigue stress on photovoltaic modules and cells in natural environments. (Standard dynamic mechanical load test, applying 1000Pa positive and negative pressure on the front of the module for one cycle, 3 to 7 cycles per minute, a total of 1000 cycles)

In actual situations, the way the components are fixed and installed will determine whether the mechanical properties of the photovoltaic components can be ensured and protected to the greatest extent.

The service life of a photovoltaic power station can reach 30 years. In order to more realistically simulate the impact of wind in an actual environment, Baowei New Energy tested the mainstream 182/210mm photovoltaic modules in a wind tunnel test environment.

When photovoltaic modules are subjected to mechanical loads such as heavy snow, strong winds, and hail, the modules will be stressed and may crack, which will lead to a series of problems such as moisture ingress, cell cracks, weld joint fatigue, and cell corrosion. These problems usually lead to reduced energy output and even field failure of modules and systems.