How to guarantee the safety of floating array when water level change？
When the water level drops, the cables are slack, and when there is an incoming wind, the floating array drifts, and the cables on the incoming wind side are tightened due to the drift, thus limiting the drift range of the floating array. When arranging the floating array matrix, ensure that the distance is sufficient, and the floating array matrix will not collide to ensure safety. When the water level rises, the anchoring cable is tight, and the floating array drift is small and will not collide.
Is there any requirement for water level?
In theory, there is no requirement for the highest water level, and the minimum water level requirement is a water depth of 0.5 meters.
For application scenarios that may dry up and become stranded, it is also possible to smooth the stranded area. There should be no cliff-like drop, and the overall slope to be gradual. It is necessary to check the terrain through underwater terrain exploration.
What is the maximum design wind speed for the projects that have been implemented?
Implemented project: Taiwan Lunwei East 93MW project, the maximum design wind speed is 48m/s.
What is the maximum water depth for the projects that have been implemented? What is the maximum water level change? How long has the power station been running? Have you encountered any abnormal situation and how to deal with it?
The IRPC12.9MW project in Thailand has a maximum water depth of 25 meters and a water level change of 18 meters. Connected to the grid in April 2020. The force of the cables anchored by the array is inconsistent, which causes the floating body at the edge of the array to present a curve rather than a straight line.Treatment method: Loosen the collapsed cable that is too tight, so that the edge cable bears the same force.
What is the maximum flow rate and wave height for the projects that have been implemented? How long has the power station been running? Did you encounter any abnormal situation and how to deal with it?
The Lunwei East Project in Taiwan has a maximum wave height of 0.5m and a maximum flow rate of 1.5m/s.The project will experience periodic strandings due to ebb and flow, and it is a seawater environment. Using the full floating body scheme, the buoyancy is large, the bottom of the floating body is relatively flat, and it will not sink into the sediment.
What is the maximum water depth and maximum water level change that the Sungrow’s floating power station can achieve? How to solve the anchoring problem?
There are no precise boundaries of maximum water depth and maximum water level change. This type of project requires a customized floating plan. The deeper the water and the greater the drop, the longer the cable will be, and the larger the water area it will occupy, which will affect the capacity of the project site. According to the specific project situation, consider adopting cross anchoring or internal anchoring scheme.
What is the maximum flow rate and wave height for the projects that have been implemented? How long has the power station been running? Did you encounter any abnormal situation and how to deal with it?
The Lunwei East Project in Taiwan has a maximum wave height of 0.5m and a maximum flow rate of 1.5m/s.The project will experience periodic strandings due to ebb and flow, and it is a seawater environment. Using the full floating body scheme, the buoyancy is large, the bottom of the floating body is relatively flat, and it will not sink into the sediment.
What is the maximum water depth and maximum water level change that the Sungrow’s floating power station can achieve? How to solve the anchoring problem?
There are no precise boundaries of maximum water depth and maximum water level change. This type of project requires a customized floating plan. The deeper the water and the greater the drop, the longer the cable will be, and the larger the water area it will occupy, which will affect the capacity of the project site. According to the specific project situation, consider adopting cross anchoring or internal anchoring scheme.
What is the maximum wind speed that can currently be achieved?
The current Taiwanese project is close to 100MW, with a design wind speed of 245kph. The project on the Laguna Lake in the Philippines is being designed, with a design wind speed of 270kph. At present, there is no limit of wind speed, and it is necessary to design different arrays and anchoring systems according to the actual situation.
The wave height of the Bangladesh project is 1.8m. Is there a wave mitigation plan?
If a floating system is used, it is recommended to use a floating breakwater. The whole set includes anchoring, wave elimination and connection, about more than 100,000 yuan per meter. It is also possible to use the form of building water dikes to eliminate waves.
Is it possible to use Floating platform in high wind speed areas in the Philippines, and if not, what are the implications?
Considering safety, if a centralized inverter is used, it is recommended to place the box inverter on the shore, which will increase the length of the DC cable and increase the cable loss, which will affect the power generation. If a string inverter is used, it is also recommended to place the box transformer on the shore. In the later stage, the cable routing can be optimized, taking into account both safety and cost.
What is the maximum wind speed that can currently be achieved?
The current Taiwanese project is close to 100MW, with a design wind speed of 245kph. The project on the Laguna Lake in the Philippines is being designed, with a design wind speed of 270kph. At present, there is no limit of wind speed, and it is necessary to design different arrays and anchoring systems according to the actual situation.
Floating body for extremely cold and icy environments
1. For the floating power station project on the surface of the alpine region, a floating power station test project was built in Xinhua Lake in Daqing City in 2018. Since the floating power station has been connected to the grid, it has experienced long-term freezing and snowfall, and has operated stably without any problems.
2. After long-term freezing of the floating body product, its performance indicators are measured in the laboratory, and all meet the requirements, which proves that freezing will not affect the performance of the floating body, the floating body will not have an impact on the environment, and will not be squeezed, deformed and damaged by icing.
What is the solution when the site is stranded?
When the site is stranded, it is necessary to ensure that the bottom of the water is flat first, without cliff-like drops and large slopes, to prevent cracks and damage to the components.
In addition, counterweight processing can be done to deal with it. For example, a circle of floating bodies is added around the square array, and the floating body is filled with water or sand for counterweight to reduce the impact of wind loads.
The array system should also try to reduce the occurrence of stranding. The above plan is only a temporary solution, not a permanent plan.
The whole process of floating power station construction？
First of all, in the construction of the anchoring system, fix the cable to the pile or anchor block and install it at the position specified in the drawing, and fix the other end of the cable to the floating ball or temporary floating body to prevent the cable from falling into the water. Then the construction of the floating body assembly platform, based on the construction period and the size of the local site, the number and size of the construction platform.
Furthermore, when assembling the phalanx sub-arrays, every 3-5 rows of floating bodies will drag the sub-square arrays into the water until the sub-square arrays are completely assembled, and the sub-square arrays launched into the water can be temporarily anchored on both sides of the phalanx. Then use the boat to drag the sub-array to the designated position and install the anchor.
Finally, each sub-array is pulled into the designated position, and the sub-arrays are spliced on the water to complete the installation of the entire array.
How does a floating body ensure the stability of the support? How to connect the anchor block to the floating body, and how many connection points are there?
For the stability of the support, generally before the product is put into the market, the physical wind tunnel test (third-party inspection, TUV) will be carried out on the system module of the floating body + component + bracket + rod, and the loading test (wind load) will be carried out from different directions of the module. , through the stress and strain sensor, observe the stress changes of components, brackets, rods, floating bodies, etc., as well as the stability of the entire system (vibration, etc.), so as to find the upper limit of the maximum wind speed that the corresponding bracket can adapt to.
The anchor block is connected to the anchoring metal structure on the edge of the floating array through the mooring cable. Specifically, how many mooring points are needed, and the final number of points needs to be determined by the anchoring calculation.
Can it be used in highly corrosive water？
For special water quality application scenarios, water samples need to be brought back to the laboratory for testing (to check whether it has an effect on the weather-resistant material composition of the floating body).
The projects we have done so far have the lowest PH value of 3 (13MW project in Malaysia)
High Corrosion project in seawater environment: Taiwan 180MW (90+90) project.
Special water quality projects have higher system costs than conventional freshwater quality solutions.
