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Original title: Light up the lights of Beijing with the wind by Zhang Bei: Grundfos helps the Beijing Winter Olympics
In Zhangjiakou City, Hebei Province, the venues and support facilities for the 2022 Beijing Winter Olympics in Zhangjiakou are under heavy construction. This city, which is located in the area connecting the North China Plain and the Inner Mongolia Plateau, has strong winds throughout the year. “A wind in the dam blows from spring to winter.” This is a portrait of the city caught by the wind in the past. Preliminarily determined by the national energy department, the reserves of wind resources that can be developed in the region reach more than 40 million kilowatts, which represents 71% of the onshore wind resources in Hebei Province. At the same time, this is also the region with the richest solar energy resources in Hebei Province, with a solar energy development capacity exceeding 30 million kilowatts.
The development and challenges of renewable energy in Zhangjiakou
In 2005, China enacted the “Renewable Energy Law”, followed by related policies including “Implementation Opinions on Promoting Wind Power Industry Development”. With exceptional natural conditions, Zhangjiakou wind power and other renewable energies have also entered a period of rapid development. At the end of 2019, Zhangjiakou’s installed renewable energy capacity reached 13.6 million kilowatts, ranking it among the entire country.
However, it contrasts with the lack of absorption capacity and the construction of external transport channels. Data shows that in 2014, the maximum grid load in Zhangjiakou was only 1.85 million kilowatts, and the external transmission capacity of renewable energy was less than 4 million kilowatts. In this context, it is not uncommon to abandon wind power rationing in Zhangjiakou.
In China, the challenges facing renewable energy sources, including wind power and solar power, are twofold. First of all, the randomness, volatility and intermittency of this kind of power are large, so connecting to the grid on a large scale will have an impact on the grid. Taking wind power as an example, it can only generate electricity when there is wind, and it is often at night when the wind is strong, and peak reduction is very difficult when the power load is the lowest. Second, unlike Denmark and other countries where the development of wind energy is relatively mature, the self-consumption model is different: the renewable energy generation center and the energy load center of China are far apart. In the event that it cannot be absorbed locally, only by building long-distance energy transmission channels can these resources be used effectively.
Flexible DC drive technology drives change
In the context of the increasing development of renewable energies, Flexible HVDC (Flexible HVDC) has emerged. The voltage and capacity of flexible DC projects put into operation in China are also increasing. Thanks to its fast and flexible controllability, high compactness and excellent environmental adaptability, flexible DC transmission technology can support efficient access to renewable energy on a large scale. In addition, the technology can also provide more adaptable transmission and reception modes, and improve the large-scale long-distance power transmission capacity of the network.
In December 2017, the Zhangbei flexible DC power grid project was approved by the National Development and Reform Commission and officially started in February 2018. This project is the world’s first flexible DC grid project, and it is also The world’s flexible DC project with the highest voltage level and highest transmission capacity. The nominal voltage of the project is ± 500 kV, the construction of 666 km ± 500 kV of DC transmission lines and the construction of 4 converter stations in Zhangbei, Kangbao, Fengning and Beijing, with a total conversion capacity of 9 million kilowatts, effectively solving clean energy. The problem of difficult and undeliverable network connection.
As a bridge for the mutual conversion of DC and AC, it can be said that the converter valve is the heart of this high-profile project. It is one of the top teams with the highest technical content and the most challenging in the flexible QC project.
Wang Ke, the test engineer of the Changzhou Borui water cooling test group, made a vivid analogy: “If the converter valve is compared to a car engine, the converter valve cooling system is equivalent. to a car’s cooling system. Once the cooling system fails, the whole car will be unable to work normally. Grundfos end suction pump with a maximum power of 315KW is used in the central water cooling system of the converter valve in the Zhangbei converter station to continuously provide ion cooling water to ensure the normal operation of the converter valve. “
It is the first time that the UHV industry in China uses a 315KW pump with such a high power pump. Four water pumps work at the same time and can pump more than 3,000 tons of water in one hour, which is equivalent to 1.5 standard swimming pools (50m * 21m * 2m). In addition to 12 end-suction pumps as main pumps, Grundfos also provides a complete solution for the auxiliary equipment of the Zhangbei converter station water cooling system and the circuit breaker cooling system.
Clean energy drives green development
On December 27, 2019, the Zhangbei flexible DC power grid project was fully commissioned and entered the live commissioning stage. Since the trial operation of the Zhangbei converter station, the system has been running smoothly, and the energy-saving effect has been outstanding.
As the world’s first flexible DC ring grid project, Zhangbei Rou Direct Power Grid Project realizes the multi-energy complementarity of wind, solar and storage power, and provides an important transmission route of power for the 20 million kilowatts of new energy planned for Zhangjiakou in 2020, which can support the venues of the Winter Olympics. 100% clean energy supply to serve the low-carbon and eco-friendly Winter Olympics.
Zhangbei’s flexible DC power grid project can receive 22.5 billion kWh of clean electricity every year, which is about one-tenth of Beijing’s annual electricity consumption, equivalent to 7.8 million tons of standard coal, which can reduce carbon dioxide emissions by 20.4 million tons and nitrogen oxide emissions by 5800. Ton, will greatly increase the proportion of clean energy consumption in Beijing, forming a pattern of mutual complementation and distribution of Beijing advantages and Zhang.
Wang Ke said, “The Zhangbei project has created 12 world firsts, and we are also very honored to be able to provide cooling systems for this project. This project brings together our latest and most advanced technology in the field of flexible straightening technology, which is beneficial to our company and the entire industry. The importance of this project is very significant. Based on the summary of the project’s construction and operation experience, we will continue to improve the level of technology and innovation to better support the development of the targeted power grid to the future “.
