Abstract
This paper investigates the worldwide development status of wind power and the main opinions and advantages of offshore wind power development in the industry, and summarizes that the development of offshore wind power will be in the direction of large capacity and distant sea area. At the same time, the distribution of wind energy resources in China’s coastal areas is investigated, and combined with the constraints of offshore wind energy development in China, it is concluded that offshore wind power development in China will also develop to distant sea areas. Secondly, three transmission modes including power frequency AC, flexible HVDC and low frequency AC are briefly described, and the technical economy of the three modes is analyzed with typical cases. In addition, the technical feasibility of 400 MW offshore wind power Grid-connected through low-frequency transmission technology is verified by system model building and simulation. Thirdly, combined with the development trend of offshore wind power, current research and manufacturing level, the opportunities and challenges of the application of low frequency transmission technology are analyzed. Finally, the main points of this paper are summarized. It is preliminarily clear that the low-frequency transmission mode has better technical and economic performance within a certain transmission distance, and can be used as a beneficial supplement to the conventional power frequency and flexible HVDC transmission mode.
Highlights
In recent years, wind power has developed rapidly
According to the Global Wind Power Development Report 2017[1] issued by the Global Wind Energy Council, more than 90 countries in the world have carried out wind power commercialization business, of which 9 countries have installed more than 10 GW wind power and 30 countries (Europe, Asia, North America, Latin America and Africa) have installed more than 1 GW wind power
China is rich in offshore wind power resources in Fujian, Guangdong and Guangxi, and the development of offshore wind power over medium and long distances has been included in the plan, which will be the main trend of offshore wind power development in the future
Summary
Wind power has developed rapidly. According to the Global Wind Power Development Report 2017[1] issued by the Global Wind Energy Council, more than 90 countries in the world have carried out wind power commercialization business, of which 9 countries have installed more than 10 GW wind power and 30 countries (Europe, Asia, North America, Latin America and Africa) have installed more than 1 GW wind power. In its Global Wind Power Development Report 2016[2], the Global Wind Energy Council predicted that in 2020 and 2030, the installed wind power in the world would reach 560 GW and 1100 GW, respectively, and the generating capacity would reach 1.4 trillion kWh and 2.8 trillion kWh, respectively. Most of the world's sea areas can start wind power generation at least half of the year, while solar energy and other limited by daytime, the available time will not exceed 50%. Low-frequency transmission technology can effectively improve the current carrying capacity of submarine cable and reduce terminal voltage fluctuation by reducing transmission frequency. It has good economy in a certain transmission distance. This paper will compare three kinds of offshore wind power transmission modes from technical and economic aspects, and give the applicable scope of each transmission mode
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