The hottest offshore wind power development potent

2022-08-21
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The development potential of offshore wind power is huge, and the biggest challenge comes from the technical problem

the offshore wind turbine, which stands more than 90 meters high above the East China Sea. As one of the most potential and dynamic new energy sources in the world, wind power has attracted worldwide attention in recent years. In 2008, the total installed capacity of wind power in China reached 12.21 million KW, with a growth rate of more than 100% for four consecutive years, ranking first in Asia. However, the vast majority of the current domestic wind power installed capacity of more than 10million kW is located on land, especially in the "Three North" (northeast, North and northwest), and the coastal areas, which are also rich in wind energy resources and traditional power load centers, should not be lower than level B2 "; The development in 2011 has just started

China is rich in offshore wind energy resources

China is rich in offshore wind energy resources. According to preliminary measurement, there are 750million kW reserves, which is two to three times that of land wind resources. The advantages of offshore wind power are: the annual utilization hours are long, the wind speed is higher than that on land, the wind shear change is small, the turbulence intensity is small, and there is a stable dominant direction. Therefore, due to the use of the pulse width speed regulation system, it has a high transmission torque at low speed, which completely changes the characteristics of the SCR continuously variable transmission system that the transmission power decreases exponentially at low speed. The unit has stable operation, long service life, does not need a very high tower, and the energy output of a single machine is large. In addition, offshore wind power does not occupy land resources and is close to the coastal power load center

according to the relevant data of the National Meteorological Administration and the energy administration, China's wind energy resources are mainly distributed in two wind zones, one is the "Three North" (North China, northeast and northwest) region, and the other is the eastern coastal and nearby island areas. Considering the technical feasibility, domestic wind farms are mainly concentrated in Inner Mongolia, Xinjiang and other inland provinces at present, but the abundance of offshore wind power resources is also attractive: according to the research of institutions such as the Energy Research Institute of the national development and Reform Commission, the wind energy resources in the offshore waters of China are about 100million kW within 10 meters of water depth, and about 300million kW within 20 meters of water depth, The wind energy resources in the sea area within 30 meters of water depth are about 490million kW, which is not inferior to that on land

in fact, as early as November 2007, CNOOC base Corporation installed a 1.5 MW direct drive wind turbine in Suizhong oilfield in Bohai Sea. However, the unit has not been put into commercial operation, and its scientific research value is higher than its commercial value

with the smooth progress of Shanghai Donghai Bridge offshore wind farm project, the first commercial offshore wind power project in China, the enthusiasm for offshore wind power development is expected to be gradually ignited. Donghai Bridge offshore wind power project is located in the eastern sea area of Donghai Bridge in Shanghai, with a total installed capacity of 102 MW and 34 domestic offshore wind turbines with a unit capacity of 3 MW. The annual power generation capacity of the project is 267million kwh, and 85900 tons of standard coal can be saved for electricity every year. It is the largest new energy project in Shanghai at present

zhangkaihua, deputy general manager of Shanghai Donghai Wind Power Co., Ltd., said, "if the Donghai Bridge project is successful, China's offshore wind power can develop greatly, otherwise the development will be delayed."

offshore wind power development has entered an accelerated period

in recent years, offshore wind power has developed rapidly in European countries. The more developed countries such as Denmark, Britain and Germany have a complete set of policy systems to support the development of offshore wind power in terms of energy, approval, finance and so on. For example, the implementation of one-stop offshore wind power project approval procedures, the provision of power generation subsidies, tax relief and green certification benefits, the sharing of data technology resources, the establishment of offshore wind power online system, etc

although it started late, there is no unified offshore wind power development plan in China at present. However, Shi Pengfei, vice chairman of the wind energy professional committee of the China Renewable Energy Society, said at the 2009 China International Offshore Wind Power Conference that at present, relevant departments have identified seven ten million level wind power bases in six provinces, including Gansu, Inner Mongolia, Xinjiang, Jilin, Hebei and Jiangsu. It is planned that by 2020, The total installed capacity of the wind power base is 126 million KW. Assuming that the accuracy of the strain gauge is not high, or the anti-aging ability of the glue used to fix the strain gauge is not good, or the data of the sensor is not good, the accuracy and application life of the sensor will be affected

danmaivestas, a global wind power equipment giant, predicts that offshore wind power will occupy a considerable share in the future development of wind power in China. Vestas has two reasons: first, there is policy support. The eastern coastal areas are economically developed and energy is in short supply. The development of offshore wind energy resources will effectively improve energy supply. Second, there is financial support. Companies with offshore oil or onshore wind power development experience are planning to invest in offshore wind power projects

in fact, Vestas' prediction is becoming a reality in some coastal provinces. Xuruilin, director of Jiangsu renewable energy development project office, said that according to the plan, by 2020, Jiangsu Province will build 3000 MW land wind farms and 7000 MW offshore wind farms in the intertidal zone and offshore. In addition to the special precautions for the use of various durometers, a 10 million kW wind power base will be formed

technical problems need to be solved

although the potential of offshore wind power development is huge, its operating environment is more complex than onshore wind power, with higher technical requirements and greater construction difficulties

first of all, the reliability of offshore wind turbines at this stage has become the key to the success of offshore wind power development. "Due to the existence of salt fog corrosion, ocean waves and tidal current impact and other factors, offshore wind farms have high requirements for units. Generally, offshore wind power equipment needs to operate on land for a certain period of time and obtain certain operation experience before it can be equipped on the sea, otherwise the investment risk will be great." Wu Yundong, general manager of Zhejiang Huayi wind energy development company, pointed out

secondly, the installation of offshore wind turbines is a problem. At present, there is no special vessel for offshore wind power construction. Moreover, the operation and maintenance of offshore wind turbines are also difficult. When the offshore wind speed is too high, the maintenance personnel cannot get close to the motorboat

zhangkaihua, deputy general manager of the owner company of Donghai Bridge offshore wind power project, introduced that the marine environment is far worse than that on land, and there is no successful example of offshore wind farm with soft soil foundation on the seabed like Donghai Bridge project, which brings great challenges to the owner company and the construction unit. At present, the planned offshore wind farms in the coastal areas of East China and North China are similar to the Donghai Bridge project

in addition, typhoon is also a severe test for offshore wind turbines. The southeast coastal provinces of China are areas where typhoons often land. When typhoon Sangmei landed in Cangnan County, Zhejiang Province in 2006, it almost caused a devastating blow to Cangnan wind farm. Among the 28 units of Cangnan wind farm, 20 have been damaged to varying degrees. "According to the current technical level, offshore wind farm development can be boldly carried out in the coastal area north of the Yangtze River Estuary, and offshore wind power development in the area south of the Yangtze River estuary must be cautious." Wu Yundong said

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