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How to connect the gradual withdrawal of traditional energy and the substitution of new energy?

日期: 2021-12-21
浏览次数: 1

Energy is the main battlefield to achieve carbon peak and carbon neutralization, and electricity is the main force of the main battlefield. In 2020, China's carbon dioxide emissions from energy consumption account for about 88% of the total emissions, while the power industry accounts for 42.5% of the total emissions of the energy industry.

In the view of industry experts, promoting green energy is an important part of achieving carbon neutrality. Looking for alternatives to fossil energy is a key link.

For Guangdong, which is a major energy consumption province but not a major energy production province, breaking the 'resource bottleneck' and realizing the smooth transition between the gradual withdrawal of traditional energy and the substitution of new energy is necessary to ensure energy security and promote high-quality economic development.

Resource endowment Guangdong renewable energy potential at sea

Take the plane to Shapotou airport, Zhongwei, Ningxia. Looking out from the porthole, you can clearly see that the airport is surrounded by a large number of photovoltaic panels, which is spectacular. In the 3-hour drive from Zhongwei to Shizuishan, there are big windmills on both sides of provincial highway 218 outside the window. Ningxia, famous for its desert scenery, enjoys natural superior wind and light resources.

However, Guangdong, located in the southeast coast, does not have the superior natural resource endowment in the northwest. 'There is a large demand for land, which is a bottleneck restricting the development of onshore wind power and photovoltaic in Guangdong.' Li Lishu, academician of the Chinese Academy of engineering and honorary chairman of the expert committee of China Southern Power Grid Corporation, said.

'The generation hours of onshore wind power and photovoltaic power in Guangdong are not high, and the proportion of hydropower transmitted from west to east by new energy is relatively high, but the future development needs of the rapidly developing western provinces are also great.' Song Qing, senior engineer of the energy consulting and Planning Institute of Guangdong Academy of Sciences, said.

Guangdong's advantage lies in the sea. In Zhuhai, Yangjiang, Shanwei and other places, large windmills have spread all over the offshore, and many projects have been put into operation in recent days. At the end of November, 91 fans of CGN Shanwei Houhu 500000 kW offshore wind power project were all connected to the grid for power generation, with an annual on Grid power of 1.489 billion kwh.

The high cost is the main bottleneck of offshore wind power development. Different from photovoltaic and onshore wind power, offshore wind power has not yet achieved parity because of the high cost of materials and offshore construction, and the immature technology of energy storage and transmission, especially offshore transmission.

Subsidy driven is the 'crutch' for new energy to cross the 'threshold' of parity. In June this year, the implementation plan for promoting the orderly development of offshore wind power and the sustainable development of related industries issued by the Guangdong provincial government proposed that the subsidy standards for full capacity grid connected projects from 2022 to 2024 were 1500 yuan, 1000 yuan and 500 yuan per kilowatt respectively.

The agglomeration of industrial chain is more helpful to promote the rapid development of the industry. The 14th five year plan for marine economic development of Guangdong Province issued on December 14 proposes to build an offshore wind power industry cluster, strive to build and put into operation an installed capacity of 18 million KW by the end of 2025, accelerate the construction of Yangjiang and eastern Guangdong offshore wind power industry bases, and strive to achieve an annual production capacity of 900 wind power units (sets) in the province by 2025.

'In the future, it is an inevitable trend to lose the subsidy 'crutch' and realize market-oriented drive.' Song Qing said that under the goal of 'double carbon', strong market demand will promote offshore wind power to achieve parity through technological innovation and industrial chain agglomeration. 'Photovoltaic and onshore wind power have come through this way.'

Infrastructure new power system realizes peak shaving and valley filling

Photovoltaic panels are installed on the roof of the building, small fans are next to the greening trees in the community, and electric vehicle charging piles are installed in the underground garage. Photovoltaic and wind power are supplied for electric vehicle charging, and the surplus can also be sold to the power grid. Electric vehicles have also entered the energy storage scheduling of the power grid. Li Liwu described to reporters the scene of such a new power system in the future. Users are no longer simple power users, but can also produce electricity and interact with the power grid.

For Guangdong, which is not rich in land resources, large-capacity and centralized power plants are no longer the only choice. Every new energy vehicle and green building around us will become a part of the new power system.

On the late night of August 29 this year, Guangzhou virtual power plant 'tested the ox knife for the first time'. That night, the power consumption of residents in Longxi, Liwan increased, and the power grid load was once urgent.

At this time, Guangzhou Power Grid issued the first direct regulation instruction to the bus charging company through the virtual power plant platform to accurately reduce the substation load, instantly reduce the charging power of 80 electric buses, adjust the bus charging plan time, and ensure the air conditioning power consumption of 2000 families. The next morning, the bus reconnected to the power supply and set off with full power.

Electric bus is not only the main body of power consumption, but also the main body of energy storage. Virtual power plant is to flexibly dispatch these energy storage main bodies to realize the role of peak shaving and valley filling. This is an epitome of the new power system.

'Renewable energy is fundamentally different from traditional energy supply. Now power plants are large units with large installed capacity, but the installed capacity of single renewable energy is generally small, and the distributed photovoltaic of households is smaller. If renewable energy is the main energy, it will become a single unit with small installed capacity, but a large number, which is unimaginable according to the technical means of traditional power grid Therefore, we should build a digital power grid, a transparent power grid and a new power system based on renewable energy. ' Li Lishu said.

Technical objective intelligent dispatching to ensure the safety and stability of power grid

New energy will undoubtedly become the main body of new power supply in the future, but how can new energy such as wind energy and photovoltaic bear the important task of ensuring supply? How can the new power system ensure the safe and stable substitution of new energy?

'This is a step-by-step process.' Lin Boqiang, distinguished professor of 'Changjiang Scholar' of Xiamen University and President of China Energy Policy Research Institute, said that to ensure energy supply and gradually replace traditional energy with new energy, we need to promote dynamic balance according to top-level design and market-oriented law.

The construction of new power system needs to be guided by planning, coordinate multi-objectives such as safety, economy and low carbon, and innovate power planning methods. This year, China Southern Power Grid proposed to basically build a new power system by 2030; In the next 10 years, the installed capacity of new energy will increase by 200 million KW, accounting for 22 percentage points; By 2030, China Southern Power Grid will increase the proportion of non fossil energy installed capacity to 65% and the proportion of power generation to 61%.

'Building a new power system with new energy as the main body is a hard battle, facing many challenges and many key technologies that need to be tackled.' Rao Hong, academician of the Chinese Academy of engineering and chief technical expert of China Southern Power Grid Corporation, told reporters that these key technologies mainly include large-scale new energy efficient consumption technology, long-distance high-capacity DC transmission technology, large power grid flexible interconnection technology integrating digital technology and advanced power electronics technology, AC / DC distribution network and intelligent microgrid technology.

'New energy power generation has a wide range of installed points and 'depends on the weather'. It is more difficult to coordinate the contradiction between multi-point, diverse and changeable power supply and system safe, stable and reliable power supply. The system response speed is required to be faster, the operation mode arrangement and operation dispatching control are more difficult, and intelligent operation dispatching is more important.' Wu Baoying, party secretary and chairman of China Southern Power Grid Energy Institute, said.

'The new power system takes new energy as the main body and wind power, photovoltaic and other new energy as the main body. The output power is unstable and has the characteristics of large fluctuation and randomness.' Zheng waisheng, general manager of the strategic planning department of China Southern Power Grid, introduced that pumped storage is a flexible regulated power supply with the most mature technology, the best economy and the most large-scale development conditions. Therefore, China Southern Power Grid also proposed to accelerate the construction of pumped storage in the next three five-year plans. By 2030, it is equivalent to the installed capacity of one new Three Gorges hydropower station, supporting the access and consumption of more than 250 million kw of new energy.

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