Researchers have tested a 9 x 11 floating box barrage for offshore photovoltaic in a large gulf stream, under regular and irregular golf seals. They have placed wireless gyroscopes on three of the boxes that represent the front, middle and back positions.
A research team from China has developed a new floating box array for offshore floating PV (FPV).
A large, irregular, random gulf stream was used to measure increases and severe gears, along with the Responsamplitude Operator (RAO) for heavy and pitch. A floating box, in this research context, is a floating structural unit that supports PV panels on this.
“Although the application of box-based FPV structures in marine environments are still at an early stage, their future prospects are promising,” the research group said. “A new Flate-Box-based FPV structure, optimized for marine conditions, is designed on the basis of standard floating box configurations and technical practices. The hydrodynamic response characteristics of this new structure were systematically investigated by physical models tests.”
The design of the team is made of a series of 9 x 11 floating boxes. A geometric scale ratio of 1:14 was assumed to test within a wave golf of 90 mx 2 mx 2 m. The 9 × 11 floating box Array had a width of 1.74 m and a length of 2.2 m, corresponding to a prototype installed capacity of approximately 118 kW.
A complete implementation would have used a horizontal distance from the anchor point to the floating box array of 5 m and a mooring length of 11.5 m. A solid block was used in the experiment, while the internal compartmented structure of the floating box was ignored.
Wireless gyroscopes were attached to three floating boxes along the Golf Pre -Planting Path in the central row of the floating Doosarray, which represent the front (T1), Middle (T2) and behind (T3) positions.
The Array was tested under regular wave tests, with wave heights of 4 cm or 8 cm, while the irregular wave tests were performed using the Jonswap spectrum for 1 year and 50 years of return periods. A return period of 1 year represents a normal sea, in which waves of a specific size take place once a year, while a return period of 50 years is an extreme storm that only occurs once every five decades.
The tests showed that the floating Doosarray location-dependent RAO characteristics showed, in which the scientists discovered that, in areas affected by golf, both gear and dip corners decrease with the increasing wave period, while in non-wave-affected areas combined of golf excitation and dosing Dose.
“The floating box -Array behaves like a visco -elastic flexible flexible structure (VFFs), where the elastic distortion follows closely after the wave surface. Increased wave height or shorter wavelengths cause more violent elastic reactions that cause compression and secondment,” they explained.
They also discovered that, under irregular waves, the Array phase-lagged reactions with remarkable spatial differences. The response patterns under return periods of both 1 year and 50 years old also turned out to be the same, whereby the increase in the response was not proportional to the wave height. It was also found that the shield effect of the structure reduces the emergency angles along the wave direction and the average tilt remains low enough to maintain more than 99.5% solar efficiency.
“Wave-up the height of the return period and the wave height, with the value of 1,527/min for the fifty-year return period. The affected area of golf overview is about proportional to the significant wave height,” the researchers noted. “Moreover, a significant wave was observed by the structural openings in the floating boxes, with which the design concept of opening-free connections in the new floating box array further validated.”
Their findings appeared in “Experimental research into hydrodynamic response characteristics of a new floating box Array offshore floating photovoltaic structure“Published in Renewable energy. Scientists from China Renewable Energy Engineering Institute, Chinese Tianjin University, Tianjin University of Technology, and Hebei University of Engineering participated in the study.
This content is protected by copyright and may not be reused. If you want to work with us and reuse part of our content, please contact: editors@pv-magazine.com.
