Make clean and low-carbon energy "beautiful"

At present, the installed power generation of clean energy has entered a period of rapid development. At the same time, power electronics technology, digital technology and energy storage technology are promoting the evolution of traditional power systems to a highly digital, clean and intelligent direction.

At present, energy storage is considered to be an important tool and key support for solving the unstable problem of new energy power generation. Han Yingduo, academician of the Chinese Academy of Engineering and professor of Tsinghua University, believes that the development of large-scale energy storage technology will fundamentally change the out-of-the-box characteristics of traditional power systems. At present, the storage cost of electric energy is high and the service life is short, so it can be considered to convert the storage into heat storage and cold storage, which has a higher economy, so as to support the construction of a new power system to produce social benefits. High-power power electronics technology solves the problem of UHV flexible DC remote transmission, and the development of flexible DC distribution network is more conducive to wind and photoelectric grid-connected consumption, which greatly enhances the reliability and operation safety of equipment.

Tang Guangfu believes that new power systems need to alleviate the need for large-scale energy storage. Due to technical and cost reasons, chemical energy storage is not yet able to meet the needs of large-scale grid-level energy storage. The new power system needs to adopt flexible transmission and other technologies to connect hundreds or even thousands of kilometers of wind power, photovoltaic, hydropower, etc., through flexible DC transmission, to realize the spatio-temporal complementarization of wind, light, and water power generation and the indirect energy storage role of the grid, so as to achieve the stable output of electric energy. In the future, hydrogen energy is also expected to become an important supporting technology for new power systems. The new power system needs to develop energy storage, which can not only solve the problem of peak cutting and valley filling of the power grid, but also realize ultra-long-term energy storage across seasons.

Tang Guangfu also pointed out that to achieve the goal of reaching the peak of carbon and carbon neutrality, to build a high-quality, clean, low-carbon, safe, efficient and sustainable energy system, and to build a new power system with new energy as the main body, the whole society needs to participate extensively. On the one hand, it is necessary to support the development of clean energy with the national strategic scientific and technological strength, and on the other hand, it is necessary to encourage the participation of the people, and gradually develop a lifestyle that meets the "double carbon" goal. For example, in the future, people will be able to use their mobile phones to see how much fossil energy electricity their homes use in a year and how much clean energy electricity they use. It is necessary to vigorously publicize the significance of energy transformation, popularize the knowledge of new energy, and let people accept and actively support the use of clean and low-carbon energy.