The hottest Zhou Xiaoxin examines and changes the

Zhou Xiaoxin: examine and change the traditional power system with interconnected thinking

Zhou Xiaoxin: examine and change the traditional power system with interconnected thinking

source: China industry daily Author: Li fanglei 10:42:43

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the power system is a more traditional industry in people's impression, and the roaring generators, buzzing transformers and high-voltage lines stretched in the air are the signs of the industrial era, It is difficult for people to connect it with the Internet. However, power systems do naturally have interconnected genes. It is a long realized technology to transmit interconnected information through wires extending in all directions, and it is further developed. The power structures of various primary energy power generation and decentralized layout are connected to thousands of households through large-scale interconnected transmission and distribution networks, which have the basic characteristics of natural networking; The power consumption of end users in traditional power system has already realized "plug and play", which also has typical open and shared interconnection characteristics. Power system is the main artery of national energy regulation. Different forms of energy have different fluctuation characteristics, and at the same time, they have to meet the volatility of different needs. Their matching relationship is very complex. Therefore, the overall planning of energy through intelligent computing, big data technology and Internet thinking is extremely important for China to expand various forms of energy sources, reduce energy costs, improve energy efficiency and promote the development of green energy. As the core of the new generation energy system, the concept and goal of the new generation power system are in line with the environmental protection facilities in the high energy interconnection industry chain. Zhou Xiaoxin, an academician of the Chinese Academy of Sciences, has grasped the development direction of the new generation of power system by his view of "examining and changing the traditional power system with interconnection thinking". In addition, intelligent computing, big data analysis and interconnection thinking also extend the tentacles of the power system into all aspects of society. It is impossible for anyone not to use electric energy. As long as he uses electric energy, he is a terminal of the power network. In the view of interconnection thinking, its potential market is very imaginative

on April 25, the 2019 China Power Industry Development Summit Forum was held in Beijing. At the forum, Zhou Xiaoxin, an academician of the Chinese Academy of Sciences and honorary president of the China Electric Power Research Institute, explained the connotation and cognition of energy interconnection from the key indicators of the new generation of energy system, and proposed that under the new situation, the traditional power system should be examined and changed with interconnection thinking, so as to achieve a longer-term development

at present, China is implementing the third generation of electricity. Its goal is to realize the power generation based on renewable energy and other non fossil energy (the power generation will account for more than 70%~80%), combine the backbone power supply with distributed power supply, and combine the backbone power supply with local quota and micro, so as to realize intelligent electric control, protection system, self-healing of intelligent power transmission and transformation equipment and networks, large capacity, low loss The environment-friendly power transmission mode greatly improves the reliability of power supply, basically eliminates the risk of accidental power failure of users, and focuses on the intelligent power distribution and micro with distribution combined economies of scale and wide access to distributed energy, providing two-way energy current, comprehensive energy, power and information services. Generally speaking, the third generation of electricity is the inheritance and development of the first and second generation of electricity (power system) over the past 100 years. It is a new generation of power system that promotes the transformation and development of energy under the new situation and constitutes the core of the new generation of energy system

the main technical features of the new generation power system mainly include high proportion renewable energy power system, high proportion power electronic equipment power system, multi energy complementary integrated energy power system, and intelligent energy power system with information and physical integration. Among them, the cost of wind power generation in a high proportion of renewable energy power systems has continued to decrease in recent years. Taking the photovoltaic industry as an example, in the past 10 years, like many domestic peers, the price of photovoltaic modules in China has fallen from nearly 50 yuan per watt to about 2-2.2 yuan; The price of photovoltaic inverter is reduced from about 2 yuan per watt to about 0.2 yuan; The cost of the whole photovoltaic system is reduced from about 60 yuan per watt to about 5 yuan. From 2007 to 2018, the cost of photovoltaic kwh has decreased by about 90%, and the lowest bid price of photovoltaic leading base has been reduced to 0.31 yuan/kWh (Golmud, Qinghai), which is lower than the local benchmark price of desulfurization coal. In addition, the weighted average lcoe cost of global onshore wind power decreased by 85%, from US $0.4/kwh in 1983 to US $0.06/kwh in 2017. In the application of high proportion renewable energy power system, the progress of chemical battery energy storage application is also worthy of attention. The main function of chemical battery energy storage is that it can effectively alleviate the problem of local power supply shortage during peak power consumption, provide a variety of auxiliary services for power operation, and provide guarantee for the safe and stable operation of local power. A prominent example is the battery energy storage power station in Zhenjiang, Jiangsu Province, with a total energy storage capacity of 101mw/202mwh, which was completed and put into operation on July 18, 2018. The total capacity of the large-scale regional energy storage power station under construction in Gansu Province will reach 180mw/720mwh. After its completion, it is expected to use about 220million kwh of new energy waste annually, helping to reduce the light rejection rate of new energy in Gansu by 1-2%. The multi energy complementary integrated energy power system is mainly reflected in the source base and the end consumption integrated energy power system. In the integrated energy power system of the source base, the brand popularity of hydropower, wind power and solar power is further expanded, and energy bases and energy storage such as energy generation and flexible coal power are further expanded to realize multi energy complementary transmission to the Middle East through DC transmission; Electric heating and cooling, industrial power consumption, and local consumption in various ways; Electrolytic hydrogen production and methane production are utilized locally or transmitted eastward through natural gas pipelines

establish the thinking of energy strategic interconnection and deep integration

academician Zhou Xiaoxin also introduced in detail the interconnection characteristics of traditional power systems. It mainly includes: in the traditional power system, all kinds of primary energy power generation and decentralized power supply structures are connected to thousands of households through large-scale interconnected transmission and distribution networks, which has the basic characteristics of natural networking; The power consumption of end users in traditional power system has already realized "plug and play", which has typical open and shared interconnection characteristics. This is the idea that computer information system has been able to realize after years of struggle. The traditional power system has typical interconnection thinking, which is further and widely integrated with information interconnection. Transforming the traditional power system with interconnection thinking, deeply integrating with information and communication technology, and building energy interconnection are the key steps to build a new generation of power system

however, there are still many deficiencies in the software and hardware of the interconnection of the traditional power system at present. The traditional mode of single power production, transmission, distribution and use in the traditional power system can not achieve multi energy synergy and complementarity, so as to efficiently meet the multi energy needs of users. The user goal of traditional power system is single, and the concept of user centered and the ability of information symmetry and two-way interaction are insufficient. The centralized and unified management, dispatching and control system of the traditional power system is not suitable for the efficient integrated system of a large number of distributed new energy power generation and consumption, and the development trend of decentralized supply and demand and flat system connected to the integrated energy power system

based on this, the State Grid Corporation of China recently proposed the strategic goal of vigorously building a new generation of power system for energy interconnection enterprises. Its main content is to build a clean, low-carbon, efficient and safe new generation energy system with internet thinking and technology to realize energy transformation. On the basis of smart electricity, energy interconnection is a new form of energy system and energy industry development, in which the concept and technology of interconnection are deeply integrated with energy production, transmission, storage, consumption and energy market. It is an important development direction of the new generation of energy system. As the core of the new generation energy system, the concept and goal of the new generation power system are highly consistent with the energy interconnection. Its core goal is to solve the primary problem of China's energy revolution, that is, to maximize the development and utilization of renewable energy, to maximize the comprehensive utilization efficiency of energy, and to achieve the sustainable development of the energy system