On December 25th, the National Science and Technology Ministry’s 863 Plan major special project Wind Farm Flexible HVDC Access Technology Research and Development Demonstration Project Nanao ±160 kV multi-end flexible DC demonstration project (hereinafter referred to as Nanao multi-end flexible straight project) was formally put into production. It symbolizes that China Southern Power Grid has overcome the world's difficulties in control and protection of multi-terminal flexible DC transmission, and has enabled China to take the lead in the world to master the full range of core technologies for the design, testing, commissioning and operation of multi-terminal flexible HVDC transmission complete sets of equipment.
A world problem, a typical demonstration of the domestic power grid development model for production, learning and research, a new breakthrough of an international HVDC transmission technology...... South Australia multi-end soft straight project for long-distance large-capacity transmission, large-scale intermittent clean power access, multi-DC feed In order to provide safe and efficient solutions, China has become another major innovation in the field of international HVDC transmission after the ±800kV UHV DC transmission project.
Flexible DC transmission has become the most recognized technical solution for wind power grid integration. Compared with conventional HVDC transmission, flexible DC transmission technology can save over 10% of investment in some occasions with a capacity of 10,000 to 1 million kilowatts, especially for offshore interconnection of offshore wind farms that are located far from the shore. It is initially predicted that the world market for flexible DC transmission will be over 100 billion yuan in the next decade.
Since 1997, ABB successfully built and commissioned the world's first flexible DC transmission test project in Sweden. Since then, research on flexible HVDC transmission has been active all over the world, but progress has been slow.
Dr. He Zhiyuan of the Chinese Academy of Electric Power introduced that, in 2006, the State Grid Corporation of China established the “Framework for Key Technologies for Flexible HVDC Power Transmission Systems†and initiated a comprehensive study of key technologies in flexible HVDC transmission in China, which is almost in sync with Siemens. Flexible DC transmission technology is more difficult than conventional DC, and its technical superiority and breadth of application are beyond its reach. It is precisely because of this that it has become a major technological revolution with a strategic significance of energy and has been greatly favored by Europe and the United States. And other developed countries pay attention. The difficulty of research is evident here.
Multi-fingered refers to flexible DC projects at both ends and the technology is more complex. Xu Shuzheng, a multi-end soft straight engineering project engineer from Nanao, said that the two-terminal DC transmission system cannot achieve access to multiple power points (such as wind farms, decentralized small hydropower, etc.) or simultaneous power supply of multiple load points, and a multi-terminal system can Multiple offshore wind farms and isolated islands are connected to the mainland to form a DC network. In the case of saving investment and reducing the occupation of sea resources, the island can meet the needs of the island's electricity while sending surplus energy to the mainland.
In layman's terms, a flexible HVDC transmission system is used in the existing power grid, which is equivalent to connecting a valve and power supply in the power grid. It not only can effectively control the electrical energy passing through it, but also isolates the spread of power grid faults. According to the needs of the power grid, it can send or absorb a part of its energy quickly, flexibly, and adjustably. Dr. He Zhiyuan, from the China Academy of Electric Power, said that it has a certain role in optimizing the distribution of the power grid, enhancing the stability of the power grid, and enhancing the intelligence and controllability of the power grid.
Spring Washer,wave spring washer,disc spring washer,helical spring washer
Jiangsu Minglu Stainless steel Co.,ltd , https://www.minglufastener.com