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China's new power system structure is gradually shifting to new energy
Seetao 2023-02-03 10:23
  • It is estimated that by 2030, China's new energy power generation will become the largest power source
  • State Grid will speed up the construction of pumped storage power stations, and strive to reach 50 million kilowatts of pumped storage installed capacity in 2025
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Recently, a reporter from Jiandao.com learned that the installed capacity of new energy in Xinjiang Power Grid reached 40.655 million kilowatts, breaking through the 40 million-kilowatt mark for the first time, accounting for 36.09% of the total installed capacity; the proportion of new energy installed capacity in Northwest Power Grid increased to 45%. The scale reaches 157 million kilowatts, surpassing the installed capacity of coal power and becoming the largest power source in Northwest China. By the end of 2022, the installed capacity of new energy in many provinces has set a new record, marking that China's power system is changing.

The key to the construction of a new power system is to restructure the development format, main body positioning, technical characteristics, price mechanism, and management model of energy and power based on the attributes of electric energy commodities and the design of their evolution paths in order to meet the development needs of high-volume new energy. Therefore, the "new" of the new power system is all-round. Xie Jingdong, executive deputy director of the Energy and Power Science and Technology Innovation Center of Shanghai Electric Power University, pointed out.

Since the country proposed to build a new type of power system, China's power grid companies have taken ensuring energy and power security as the basic premise, meeting the power demand of economic and social development as the primary goal, taking the maximum consumption of new energy as the main task, and taking the strong smart grid as the hub platform , is building and improving China's new power system.

UHV boosts grid integration of new energy

One of the characteristics of the new power system is its new structure. The power generation structure has shifted from traditional thermal power to new energy. Under the new power system, the operation of the power grid shows the characteristics of focusing more on advanced transmission technologies such as UHV and flexible DC, and continuously improving the flexibility and supporting role of the power grid.

Xin Baoan, chairman of the State Grid Corporation of China, once pointed out that it is expected that by 2030, the installed capacity of new energy power generation in my country will surpass coal power and become the largest power source; before 2060, new energy power generation is expected to exceed 50%, becoming the main body of electricity.

In the process of transformation and development from the traditional power system to the new power system, conventional coal-fired units have gradually evolved from providing power supply to ensuring the safety of the power system, providing power auxiliary services, and providing power supply. Most of the power The supply function is replaced by new energy. Xie Jingdong analysis.

Baihetan-Jiangsu ±800 kV UHV DC project completed and put into operation

The high proportion of new energy connected to the grid has brought huge challenges to the safety of the power grid. People in the industry generally believe that the construction of UHV transmission channels will alleviate the situation of abandoning wind and solar in China, and a reasonable UHV grid will become the main transportation channel for new energy. . At present, the Baihetan-Jiangsu ±800 kV UHV DC project has a power transmission capacity of 800 kilowatts. The project has increased the output value of the power transmission and transformation equipment manufacturing industry by about 18 billion yuan, driving the investment in power supply and other related industries by about 100 billion yuan; , The Guangdong-Hong Kong-Macao Greater Bay Area DC back-to-back, and the completion and commissioning of the 220 kV third channel of the Guangdong-Macao Interconnection also drove the smooth circulation of the industrial chain supply chain and ensured the consumption of renewable energy.

In 2022, the approval of UHV projects will also be accelerated. The National Energy Administration will start the research and demonstration work on the integration of inter-provincial and inter-regional transmission channels and supporting power sources in the Northwest region; The project has 24 intersections and 14 straight lines, involving more than 30,000 kilometers of lines, with a transformation capacity of 340 million kVA and a total investment of 380 billion yuan; during the 14th Five-Year Plan period in Sichuan Province, the middle reaches of the Yalong River-Jiangxi, Baihetan-Jiangsu, and Baihetan-Jiangsu will be built. The Baihetan-Zhejiang and other ±800 kV UHV DC projects have started construction of the upper reaches of the Jinsha River-Hubei Multi-Energy Complementary Outward UHV DC Project.

Energy storage increases new energy grid-connected regulation capacity

Ding Yanzhang, Secretary of the Party Committee and Chairman of PowerChina, once pointed out that hydropower is an important force to promote the energy revolution and build an energy powerhouse, and it is also the ballast stone and stabilizer for building a new power system with new energy as the main body.

In order to implement the dual-carbon goals, comprehensively build a new type of power system, and realize the green development of the power system, in 2022, power grid companies will speed up the construction of super power bank - pumped storage.

From the perspective of the State Grid, on December 16, 2022, Unit 8 of the Hebei Fengning Pumped Storage Power Station will be put into operation for power generation; on December 26, 2022, the Jinzhai Pumped Storage Power Station in Anhui will be fully put into operation for power generation. So far, the State Grid Corporation of China has put into operation 15 units with an installed capacity of 4.55 million kilowatts in the field of pumped storage last year, exceeding the annual production plan of 12 units with an installed capacity of 3.65 million kilowatts set in early 2022. As of the end of 2022, the total installed capacity of pumped storage in State Grid is 28.06 million kilowatts, and the pumped storage business is booming. Compared with the 13th Five-Year Plan, the State Grid’s investment in the 14th Five-Year Plan will increase by about 43% year-on-year.

From the perspective of China Southern Power Grid, on December 23, 2022, China's first single-machine 400 MW variable-speed pumped storage project, China Southern Power Grid's Huizhou Zhongdong Pumped Storage Power Station, started construction. The total investment of the power station is about 8.3 billion yuan, with a total installed capacity of 1,200 megawatts. It will strive to be put into operation before the end of 2025. It will help the Guangdong-Hong Kong-Macao Greater Bay Area to accelerate the construction of a new energy system and improve the manufacturing level of pumped storage equipment in my country; May 28, 2022 , Two million-kilowatt pumped storage power stations in Meizhou and Yangjiang, Guangdong, constructed by China Southern Power Grid Corporation, were put into operation at the same time. As of the end of November 2022, the seven pumped storage power stations in the Southern Grid area will generate a total of 8.585 billion kWh.

China Southern Power Grid Co., Ltd. does a good job in the planning and construction of new energy supporting power grids and the grid connection of power generation

In addition, Sun Chuanwang, a professor at the China Energy Economics Research Center of Xiamen University, pointed out that the new power system model is new, energy storage has entered a stage of rapid and diversified development, and the power system model will change from source-network load to source-network load-storage.

At present, the integration of source-grid, load-storage has been initially practiced in China. For example, Shanghai Power Grid has built four demonstration projects of integrated operation of source-grid, load-storage in Huangpu, World Expo, Zhangjiang, and the office area of Shanghai Economic Research Institute, and aggregated demand-side response resources to participate Peak shaving auxiliary services; Erdos Ejin Horo Banner Mengsu Economic Development Zone Zero Carbon Industrial Park has realized the complementarity of wind power, photovoltaic and hydrogen energy through energy storage technology and intelligent Internet of Things technology, and finally formed a stable and economical electric energy network.

Continue to improve the construction of new power systems

In the new power system, the power grid plays a more significant role as the core hub for absorbing a high proportion of new energy.

Power grid construction plays an important role in the construction of a new power system: first, the supporting role, as the backbone framework of the new power system, supports the orderly operation of the power system; second, the guarantee role, ensuring the safe and stable supply of power, and promoting the optimal allocation of power resources; It is a hub, connecting to the regional power grid and serving a wider range of power supply and demand deployment. Sun Chuanwang pointed out.

State Grid stated that in the next five to ten years, it will focus on the development and construction of energy bases in Northwest China for the construction of new power systems. During the 14th Five-Year Plan period, the State Grid will speed up the construction of pumped storage power stations, and strive to reach 50 million kilowatts and 100 million kilowatts of pumped storage installed capacity in the company's business area by 2025 and 2030, respectively. In addition, State Grid also supports the large-scale application of new energy storage. It is estimated that the installed capacity of new energy storage in the company's operating area will reach 100 million kilowatts in 2030.

The "China Southern Power Grid Corporation's Action Plan for Building a New Power System (2021-2030) White Paper" plans that by 2025, China Southern Power Grid will support the five southern provinces to increase the installed capacity of new energy by more than 100 million kilowatts, and the proportion of non-fossil energy will reach more than 60%. ;By 2030, a new type of power system will be basically built to support the addition of more than 100 million kilowatts of new energy installed capacity, and the proportion of non-fossil energy will reach more than 65%. 5. Newly put into operation 6 million kilowatts, 15 million kilowatts, and 15 million kilowatts of pumped storage, and newly put into operation 2 million kilowatts, 3 million kilowatts, and 5 million kilowatts of independent energy storage on the grid side to meet the access of 300 million kilowatts of new energy and consumption.Editor/Ma Xue

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