前言 With the continuous consumption of fossil energy, increasingly severe climate change and worsening environment pollution, the human being has put forward higher requirements for reliable, environmentally friendly and sustainable energy, bringing global energy interconnection into being. The core of sustainable development is clean development. UHV transmission technology is critical for the reliable and efficient delivery of clean energy, and it is of great significance to promote its global allocation.After a century of development, the transmission technology of power system has made great progress in terms of voltage level, transmission capacity and distance. As for UHV AC power transmission technology, UHV DC transmission technology, flexible AC and VSC DC transmission technology, their respective voltage and transmission capacity have exceeded 1000 kV/5000 MVA, ±1100 kV/12000 MW and ±800 kV/5000 MW. Flexible AC transmission technology has started to be applied in 1000 kV projects. The development of UHV power transmission technology provides a strong support for the world’s large- scale energy development and long-distance transmission, facilitates a large-scale optimization of energy allocation, and greatly improves the reliability and economic efficiency of power supply in human society.UHV power transmission technology will see a broader development space and application market in the construction of global energy interconnection (GEI). UHV power transmission technology can make it possible for thousands of kilometers and 10 GW power transmission and cross-border and transcontinental grid interconnection, while VSC HVDC transmission technology can enhance the flexibility of system operation, meet the friendly interconnection of clean energy such as photovoltaic and wind power and support their flexible configuration. The two technologies are of great significance to enhancing the system stability, ensuring the wide access, transmission and consumption of clean energy and improving the flexibility and reliability of power grid operation.Since GEI involves the development of different types and scales of clean energy, the power transmission of different capacities and distances and the intensive interconnection of power grid with different characteristics and development levels, it raises higher requirements for UHV power transmission technology. During the construction of GEI, it will be characterized by higher clean energy proportion at the power source side, larger clean energy base scale, longer transmission distance, more complex grid topology and environment, and higher requirements for reliable, flexible and affordable power supply. Therefore, to further enhance the power transmission capability of UHV AC and flexible power transmission technologies and extend their scope of application, improve their stability, security, flexibility and grid-integration strategies and reduce the power transmission cost is an important development trend for power transmission technologies.In view of this, the report summarized the current situation, main technological innovation and engineering practice of current UHV AC/DC power transmission technologies and flexible AC/DC power transmission technology. Combined with the technical demand for large- capacity and long-distance clean energy transmission and more reliable and flexible interconnection, the development trend of various technologies were further prospected, to provide reference for the industrial development.The report is composed of three sections, which separately introduce the development history and current situation, technological innovation, core equipment, test system, typical projects and development prospect of UHV AC, UHV DC and flexible power transmission technologies.GEI is the optimal scheme for optimizing the allocation of clean energy and solving such complex problems as global energy dilemma and climate change, while UHV power transmission technology will be an important guarantee for achieving this grand goal, with broad development space and application prospect. The research results will play a positive role in promoting the research and development of advanced power transmission technologies and key facilities, improving the efficiency of clean energy development and delivery, promoting the progress of power industry and supporting grid interconnection on a larger scale.
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