New power system needs "two rounds" of technical policy to promote

"Under the'double carbon' goal, new energy will replace conventional units for power generation, which will bring three major challenges to the new power system." Guo Jianbo, honorary president of the Chinese Academy of Electrical Sciences and academician of the Chinese Academy of Engineering, believes that the new power system must strengthen scientific and technological innovation and promotion and application.

Guo Jianbo made the above speech at the first "Jixia Electric Forum. On August 5, the first "Jixia Electric Forum" jointly sponsored by the Power System Professional Committee of the Chinese Society of Electrical Engineering and Shandong University attracted the participation of five academicians of the "two academies. Under the theme of "all things connected by electricity, the future of carbon cable", many experts in the field of domestic energy have conducted discussions on China's energy development and the construction of new power systems.

New Power System Faces Triangle Challenge

It is understood that the construction of a new power system is an evolutionary process. From the concept, the beginning of construction to the full completion, to achieve the goal of carbon peak, carbon neutrality, different stages have their own main contradictions and key elements. But the main contradiction that has existed for a long time is how to break the "contradictory triangle" of economy, security and environment ".

Guo Jianbo believes that the new power system is a multi-industry and multi-energy coupling and collaborative information-physical society complex giant system with the power system as the hub platform. It is also a system that combines new and old technologies on the basis of the existing power system and uses new policies and regulations, new systems and mechanisms, new standards and norms, and new industrial foundations to give new definitions and new concepts.

Under the goal of "double carbon", green power such as wind power and photovoltaic power generation in China has developed rapidly. According to the calculation of Zhou Xiaoxin, an academician of the Chinese Academy of Sciences, in the carbon neutral stage, China will achieve a high proportion of non-fossil energy to fossil energy power "green electricity replacement; it can be expected that the" green electricity substitution "and" green hydrogen substitution "of traditional fossil energy will be the key measures to achieve the goal of carbon neutrality in the new energy system, and will play a decisive role in the construction of new energy power system in the future.

Guo Jianbo believes that the replacement of conventional units for power generation by new energy will bring three major challenges to the new power system-new energy resources are random, volatile, low-density and decentralized, which makes the temporal and spatial distribution of power generation output extremely unbalanced and "high installed capacity and low power", bringing ample challenges. New energy power generation equipment has low immunity and weak support, and the contradiction between rapid and controllable output and limited capacity is prominent; the contradiction between the high contribution of new energy to energy transformation and the environment and the low contribution to adequate security requires the coordination of the rights of multiple stakeholders (multi-industry, multi-system, multi-energy, multi-power) to balance the security-economy-environment relationship, bringing institutional challenges. He pointed out that security, economy, and environment are all policy and technology-related indicators, and they need to be promoted in tandem with technology and policy.

To face the challenge, both government, industry, education and research have the responsibility.

The weather in Jinan in August was hot, but the academicians' speeches pointed to a number of key words-face the challenge and deal with it calmly. As Li Shancai, academician of the Chinese Academy of Engineering and president of Shandong University, said: The first "Jixia Electric Forum" is to meet the requirements of the standard era, strengthen responsibility, and support the in-depth exploration and vivid practice of Chinese-style modernization with the power of education.

With the rapid development of China's power system, the installed capacity is increasing, the grid structure is more closely linked, and the problem of short-circuit current exceeding the standard is gradually prominent, which has an impact on the safe operation of the system and equipment. Chen Weijiang, academician of the Chinese Academy of Sciences, introduced the basic principles, key technologies and demonstration engineering applications of the flexible suppression method of short-circuit current based on the transient reconfiguration of the power grid topology, and provided new ideas and new methods to solve the above problems.

Under the new situation, the power distribution system is a support platform for renewable energy consumption, a data platform for the integration of multiple massive information, a trading platform for the participation of multiple stakeholders, and a support and service platform for the development of electrified transportation. Its development faces multiple technical challenges in time and space dimensions such as flexibility, toughness, reliability, and controllability.

Wang Chengshan, academician of the Chinese Academy of Engineering, believes that in response to the above challenges, the new power distribution system will develop and present important characteristics such as low-carbon, distributed, decentralized and digital.

To this end, it is very necessary to carry out academic discussions in which a hundred schools of thought contend and a hundred flowers blossom. Wang Gang, secretary-general of the Chinese Society of Electrical Engineering, believes that promoting the green and low-carbon transformation of energy is the common responsibility of the government, enterprises, academic associations, and scientific research institutions. Extensive technical exchanges and experience sharing.