The breeze is peaceful and the flowers are in full bloom. The "Floating Offshore Wind Power Engineering Technology Seminar", which has attracted much attention from the industry, was grandly held in Haikou·Yate International Conference Center on April 10th. More than 500 representatives attended the meeting.

      The conference was hosted by the Offshore Wind Power Branch of China Ocean Engineering Consulting Association (hereinafter referred to as "China Offshore Wind Power Association"), the Wind Machinery Branch of China Agricultural Machinery Industry Association, China Huaneng Group Co., Ltd., State Power Investment Group Co., Ltd., China Three Gorges Group Co., Ltd. , Shanghai Survey and Design Institute Co., Ltd., Guangdong Electric Power Design and Research Institute Co., Ltd., East China Survey and Design Institute Co., Ltd., Hainan Jinpan Intelligent Technology Co., Ltd. and other joint sponsors.

      The opening ceremony and the first half of the keynote speech session were presided over by Zhai Endi, Vice President and Secretary-General of China Offshore Wind Power Association. China's offshore wind power construction is ushering in a period of rapid development. Floating wind power technology has become the focus of research and practice in deep-sea wind power. Under the guidance of the "carbon peak" and "carbon neutral" goals, this conference will bring together industry-leading discipline research Jointly explore the development path of floating offshore wind power with engineering technology experts, aiming to accelerate the innovation and progress of engineering technology and solve the problem of floating development.

      Cai Shaokuan, President of China Offshore Wind Power Association, Qi Hesheng, Secretary General of China Renewable Energy Society, Secretary General of Wind Machinery Branch of China Agricultural Machinery Industry Association, Li Zhiyuan, Chairman of Hainan Jinpan Intelligent Technology Co., Ltd., and leaders of Hainan Provincial Department of Natural Resources and Planning attended the meeting Conference and delivered a speech.

      In the context of 30·60 carbon peak and carbon neutrality, clean energy such as offshore wind power will surely assume glorious and arduous historical responsibilities. At present, the sea depth that can be used for fixed pile construction has reached 50 meters, and the development scale at a low altitude of 140 meters is not less than 500 million kilowatts. At the end of 2020, offshore wind power installed 9 million kilowatts, a growth rate of 51.6%, and the development momentum is rapid. It is expected that next year offshore wind power will undergo a three-year adjustment period after the rush to install the tide, and then the near-shallow offshore wind power will usher in a period of rapid development that lasts for more than 15 years, providing sufficient research and exploration time for the deep sea floating offshore wind power. Floating offshore wind power has a broad development prospect, and it is bound to become a dark horse worth looking forward to in the process of China's power structure adjustment.

      At the ninth meeting of the Central Finance and Economics Commission this year, the basic ideas and main measures for achieving carbon peak and carbon neutrality were studied. By 2030, the cumulative installed capacity of wind power and photovoltaic power generation will reach more than 1.2 billion kilowatts. It is expected that the annual new installed capacity of wind power will not be less than 50 million kilowatts, and the offshore wind power industry will usher in major development opportunities. Floating offshore wind power has become the first choice for deep-sea development. As the world’s largest renewable energy market and equipment manufacturer, in the new round of competition, it will accelerate the innovation and progress of floating offshore wind power engineering technology, and steadily promote floating wind power. Scale and commercial application have become an urgent task for China's offshore wind power development.

      Protecting the earth's ecology, energy saving and emission reduction has increasingly become the consensus of all countries in the world. China has firmly embarked on a green, low-carbon, and circular development path. Promoting industrial transformation and upgrading to achieve high-quality development will become the main theme of the future. For many years, Jinpan Technology has had long-term close cooperation with domestic and foreign complete machine manufacturers. With the rapid development of the wind power industry, it has actively explored and studied the operating environment of floating offshore wind power products. The company will continue to build on its core advantages, continue to increase investment, strengthen independent R&D and innovation capabilities, and actively promote the sustainable development of floating offshore wind power engineering technology through the joint efforts of experts present, so as to make better use of my country’s offshore wind resources. Make due contributions to the carbon peak and carbon neutral goals.

      After the opening speech, Fan Jihong, Chairman and Party Secretary of SPIC Science and Technology Research Institute Co., Ltd., Guo Chen, Assistant Dean of China Huaneng Group Clean Energy Technology Research Institute, and Sun Changping, Dean of China Three Gorges Corporation Science and Technology Research Institute Published a keynote report.

      In terms of offshore wind power, the Group adheres to the principle of development from shallow water to deep water and from offshore to far sea. The floating wind power in the offshore still faces the challenges of high cost and immature technology. The development of floating offshore wind power should integrate on-site hydrogen production, ocean pastures, Comprehensive consideration of smart energy and flexible DC.

      With the large-scale planning and development of offshore resources, from the perspective of resource stock, the development needs of the deep sea gradually surfaced, and the wind energy resources of the deep sea are better and more stable. The key technologies of floating offshore wind power include floating foundations, dynamic submarine cables, floating offshore wind turbines, mooring systems, etc. Floating offshore wind turbines face complex deep-sea environmental conditions, large-capacity floating unit design and manufacturing, and floating wind power The challenges of equipment manufacturing and operating conditions are complex.

      At present, most of the offshore wind farms that have been built are offshore wind farms. There are many constraints. The deep sea wind is large and stable, and the site resources are few. Offshore wind power is bound to go to the deep sea. The cost of the power transmission project accounts for a considerable proportion of the investment, and the large-scale development can realize the centralized power transmission and effectively reduce the cost. At present, my country's offshore floating wind power has entered the age of engineering prototypes. The development from shallow seas to deep seas and the demand for special geological conditions in shallow areas in shallow waters promote the industrial application and large-scale development of my country's floating offshore wind power.

      The second half of the morning theme report session was hosted by Zhao Shengxiao, Deputy Secretary-General of Offshore Wind Power Branch of China Ocean Engineering Consulting Association and Deputy Chief Engineer of East China Survey, Design and Research Institute Co., Ltd. Lin Yifeng, chief engineer of Shanghai Survey and Design Institute Co., Ltd., Zhai Endi, chief engineer of Xinjiang Goldwind Technology Co., Ltd., Zhao Yingjiu, chief engineer of Huadian Heavy Industry Co., Ltd., and Wang Ge, chief technical expert of Wison Offshore Engineering Co., Ltd. delivered keynote speeches.

      Internationally, it is judged that the fixed water depth of 50-60 meters is the critical point of acceptable economic cost, and floating wind power may be needed to solve the problem beyond the critical point. The entire continental shelf of my country is very flat, and it is difficult to support low-cost development with current technology. The development of floating wind power must break through the major key technologies of offshore wind power and seize the commanding heights of wind power. The adaptability of wind turbines to floating movement is not a simple transplantation of fixed mature units on floating platforms. Mooring systems are an important part of the cost control of floating wind power in deep water areas. Dynamic cables are a high risk point for floating wind power operations.

      Floating wind turbine technology faces technical pain points in main dimension design, complete machine design, mooring & cable layout, integrated load analysis, infrastructure check, and construction, installation, operation and maintenance. Among them, the challenges of the whole machine come from the range of motion, speed, acceleration of the unit, greater load bearing, the control strategy has a greater impact on the power generation and load, the controller needs to be adjusted to avoid unfavorable buffering, and the suitability of the unit needs to be verified, etc. . The integrated load analysis needs to consider factors such as the time domain hydrodynamic load of the base wet surface shell, the complete base structure and tower model, the dynamic mooring system, and the complete machine model. Goldwind possesses multivariable coupling technology for floating wind turbine systems, mooring system design technology under deep transitional water conditions, wind turbine-floating foundation-mooring system integrated full coupling load analysis technology, floating offshore wind power construction technology and key equipment technology Research and other solutions. In the future, the realization of price parity for floating offshore wind power will focus on improving technological maturity, technological optimization and innovation to drive the development of the industrial chain, and the path of diversified integration.

      Floating offshore wind turbines have the advantages of adapting to the depth and wide range of water, more flexible machine position deployment, complete assembly on shore, convenient offshore construction and installation, complete disassembly and migration, and the ability to carry higher-power wind turbines. Domestic floating research started relatively late, and currently includes green energy demonstration projects, Haizhuang Ministry of Industry and Information Technology demonstration projects, Longyuan Nanri Island Project and Three Gorges Yangjiang Demonstration Project. The key to further reducing the cost of floating wind power lies in technological innovation. The safety protection of dynamic cables is the key to normal operation. The combination with large floating islands, isolated islands in the sea, offshore oil platforms, hydrogen production, and ocean pastures will provide more for floating development. Broad application scenarios.

      In the life cycle of floating offshore wind power from planning to dismantling, the high degree of coordination between offshore engineering enterprises and wind power enterprises from the design to installation stage is particularly important. Floating offshore wind power is currently facing multiple challenges in the marine environment, units, foundation + mooring, dynamic cables, and booster stations. The quality of wind resources along the coast of China is inferior to that of Europe, and the waves, typhoons, and environment are worse than those in European seas. The transitional water depth of 30-60 meters makes the design more difficult. The design of the entire unit requires a coupled analysis of the motion response, including the motion response of the unit, the motion characteristics of the floating body, the motion characteristics of the mooring, the pile-soil response, the dynamic response of the structure, and the influence of the control system on the motion.

      The first half of the afternoon was hosted by Liu Di, Executive Vice President of China Offshore Wind Power Association. Wang Yibo, researcher and research director of the Institute of Electrical Engineering, Chinese Academy of Sciences, He Xiaobing, chief engineer of Mingyang Smart Energy Group Co., Ltd., Dong Yehong, chief designer of offshore floating wind power equipment of China State Shipbuilding Corporation Haizhuang Wind Power Co., Ltd., and Xu Lixin, chief scientist of China Merchants Industry Group Delivered a keynote speech.

      my country's offshore wind power has relatively high costs in terms of generating units, engineering, power transmission, and operation and maintenance. As the offshore distance increases from 40 kilometers to 100 kilometers, the proportion of transmission costs may increase significantly to 30%. Offshore flexible DC technology has the advantages of lower grid connection costs, stable grid connection, and non-synchronous interconnection. At present, more than 20 flexible DC transmission projects have been built in my country. The advantages of low system cost, high system efficiency, more stable on-grid or off-grid, simplified equipment maintenance, independent and controllable intellectual property rights, and factors such as verification of key technologies, core equipment and shore-based systems, make it more than 60 kilometers offshore The use of DC systems for offshore wind power is possible.

      Limited by the overlap of various offshore functional areas and resource constraints, deep-to-far offshore wind power undoubtedly has more room for long-term development. Relevant statistics show that there are currently more than 30 floating fan concepts in the world. During the "14th Five-Year Plan" period, offshore wind power will develop from land to sea, from shallow to deep, and from fixed to floating structures. It breaks through offshore restrictions and avoids multi-functional interference. It is suitable for super large units and has more space. In terms of operation, the floating wind turbine and the mooring system have the characteristics of towing movement after being released. Most floating wind turbines can be towed back to the port or redeployed, and the operation mode will be more dynamic and space.

      The deep sea resources account for a high proportion of offshore wind power resources. In Europe, offshore engineering equipment is leading the research and development of floating offshore wind power. The floating research ideas include two types. The design of the floating platform is based on the idea of wind power equipment and the floating platform is regarded as a special one. The basic support form of the wind turbine is regarded as a surface structure in the design based on the idea of offshore equipment. Through technological advancement, we seek solutions to conflicts between cost, performance and reliability in the overall design. In terms of comprehensive utilization, it can be combined with deep sea fishery, oil exploration, seawater desalination and other multi-mode considerations. In the future, floating wind power will become The key core technology of our country.

      The offshore wind resources and topography of different countries do not necessarily have a unified development route. European offshore wind power is richer in wind resources than in China. Floating wind power is mainly in Europe. There are many forms of floating foundation. The application of multi-unit platform has the advantages of saving sea area and reducing cables in wind farms. The main size and weight of the floating platform are the most challenging and influential key technologies of lightweight design. Installation technology has the second highest impact on cost. Advanced simulation technology is a key requirement for technical urgency. At the same time, the top three technical points related to intellectual property sensitivity include lightweight structure, wind turbine control technology, and mooring system design.

      The second half of the afternoon was hosted by Lu Zhongmin, Deputy Secretary-General of China Offshore Wind Power Association and Senior Professional of Shanghai Survey, Design and Research Institute Co., Ltd. Xia Feng, President of Ningbo Dongfang Cable Co., Ltd. (Chen Kaidai, Technical Director), Chen Wei, Vice President of Technology of Hainan Jinpan Intelligent Technology Co., Ltd., and Zhang Ao, Marketing Manager of Principle Power China delivered keynote speeches.

      The key technology of dynamic cables for floating wind turbines will be expanded from static submarine cable manufacturing to customized design, testing and certification, system optimization, and life-cycle cost management. As oil and gas development moves toward ultra-deep water, China's floating wind power design focuses on ultra-shallow water, ultra-high pressure, and cost control. At this stage, the design of dynamic cables is facing the test of lightweight, high-voltage wet insulation, typhoon and new materials. The project is facing challenges in shallow water floating wind power dynamic cable system, economy, shallow water dynamic cable sea creature growth, and high voltage dynamic output cable development of 72 kV and above.

      Dry-type transformers used in offshore floating wind towers need to focus on the impact of wind tower vibration, improve the stability of dry-type transformers in high humidity and high salt spray environments, and need to consider design solutions to isolate external polluted air. Marine corrosion and difficulty in operation and maintenance are the current challenges. Through the simulation and calculation of tilt statics, rocking kinematics, and rocking dynamics, we can solve the problems of vibration. Through the finished product type test station and the raw material physical and chemical laboratory to simulate the marine environment, the anti-corrosion performance of the product was designed and verified, and the intelligent monitoring program was developed for the dry-type transformer used in the sea to realize real-time monitoring and improve the reliability of product operation.

      70%-80% of the global offshore wind power resources are located in the deep sea area, and the wind resources with a water depth of more than 60 meters are better. Floating offshore technology will be the major outlet for the development of offshore wind power in the next decade or even 20 years. PPI’s mature technology has been widely used in the project. The original core technology of the company’s floating platform is based on nearly 50 years of data collection of local marine resources. The developed automatic water ballast system can achieve rapid balance adjustment and allow the platform to cope with various extreme case. It is believed that at many mature times, with the policy support of local governments, floating wind power is about to enter the commercialization stage.

      The roundtable forum took "Innovation and Development of my country's Floating Offshore Wind Power" as the theme and was hosted by Zhang Xiaochao, Deputy Director of the New Energy Division of China Huaneng Group Co., Ltd. Li Qingan, researcher at the Institute of Engineering Thermophysics, Chinese Academy of Sciences, Pei Aiguo, chief engineer and deputy general manager of Guangdong Electric Power Design & Research Institute Co., Ltd., Wang Jian, general manager of the offshore business unit of Xinjiang Goldwind Technology Co., Ltd., and the 702th Research Institute of China Shipbuilding Industry Corporation Cheng Xiaoming, deputy chief engineer, Xu Yiqing, deputy chief engineer of Shanghai Electric Wind Power Group Co., Ltd., and Zhang Chengqin, chief engineer of China Communications Sanhang (Shanghai) New Energy Engineering Co., Ltd. participated in the roundtable forum.

      Pei Aiguo: Guangdong Research Institute has been doing research and practice on offshore wind power technology innovation, combining the characteristics of Guangdong sea water depth, fatigue design, integrated research, and considering the typhoon environment to do some research and layout in terms of floating. In terms of promoting production, education and research, actively carry out some scientific and technological innovation cooperation with scientific research institutes, domestic and foreign universities, and complete machine enterprises, hoping to form a set of solutions as soon as possible.

      Xu Yiqing: The initial design of the floating unit was to allow the fixed offshore wind turbine to adapt to the floating foundation, but after the actual operation, the assessment of the impact on the wind turbine during the operation of the floating foundation is not particularly in-depth. Compared with the fixed type, the floating type foundation is very different. The problems existing in the monitoring system, control strategy, operation and maintenance method, etc., require technological innovation to solve the problems in practice.

      Wang Jian: Goldwind has carried out a lot of work in the field of offshore wind power, and is also doing some cutting-edge technological research and accumulation. Floating offshore wind power is a systematic project. Regardless of the design of offshore engineering or offshore wind turbine design, it needs to be considered comprehensively by the owner, complete machine, offshore engineering, and submarine cable to achieve overall optimization. Compared with the actual operating environment, the test platform is very different and requires more experience accumulation. In the overall design, it is necessary to think from multiple dimensions such as unit, offshore engineering, construction, transportation and installation, and to think clearly about all aspects of the system to realize the joint development of the industrial chain.

      Li Qingan: Floating offshore wind power is the integration of wind power equipment manufacturing and ocean engineering. It is the result of the deep design of the whole machine and the floating body. Many foreign floating wind power related enterprises have offshore engineering experience, and the foreign technology is mostly offshore engineering enterprises. Guide development. The complexity of typhoons, the influence of air currents and ocean currents on control strategies all pose challenges to the development of floating offshore wind power, which is also an important direction for future technological innovation.

      Cheng Xiaoming: Floating offshore wind power requires a new concept of unit and floating body design. The current structure is more difficult to reduce costs significantly. You can put aside the existing forms and make some new attempts. The development of comprehensive utilization is also an innovative direction. It is not only a wind power platform, but also a combination of other energy situations and aquaculture, which is conducive to cost control. Floating wind power still has a lot of refined work to be done in terms of cost reduction.

      Zhang Chengqin: In terms of floating offshore wind power, design optimization and industrial integration of the overall system are very important. In addition to the operation of the unit, there will also be corresponding requirements for loads during transportation and hoisting. The load design of floating wind turbines should consider the entire construction period. . For the construction of floating offshore wind power, the construction technical route must start with demonstration and then large-scale development.

      The "Floating Offshore Wind Power Engineering Technology Seminar", the "China Floating Offshore Wind Power Conference", is an industry summit focusing on the discussion and exchange of offshore wind power engineering technologies. More than 500 representatives from more than 200 units including government departments, social organizations, wind power investment developers, equipment manufacturing companies, consulting and design institutions, etc. attended the conference, far exceeding the design scale of the conference. The conference focused on "offshore wind power industry development, offshore engineering technology, floating units and foundations", etc., and jointly discussed cutting-edge solutions and innovative development paths of floating offshore wind power engineering technology under the new situation. Promote the continuous progress of floating offshore wind power engineering technology, and pool forces for the healthy development and commercial application of floating offshore wind power.