Large -scale landscape bases have increased in parallel, and the security of the power grid has been tested. How should the new power system be adapted?

China Times (chinatimes.net.cn) reporter Lu Xiaoxiao Beijing report

On August 2nd, the National Energy Administration held a three -quarter online press conference. The first batch of large -scale wind power photovoltaic base projects focusing on desert, Gobi, and desert areas have been fully started. It has also been issued.

The National Energy Administration also mentioned at the previous press conference that the second batch of projects were mainly deployed in Inner Mongolia, Ningxia, Xinjiang, Qinghai, Gansu and other areas. These areas are also the main distribution of desert, Gobi, and desert areas. The second batch of projects have now been included in the solid and stable economy of the State Council. At present, these areas are prompting the initial work of the project and actively promoting the construction of the project.

In the process of building a new type of power system with new energy as the main body, major projects such as the large -scale base base have become more and more role in it, which has become an important part of my country's future power system. The characteristics of sex, the power system also needs to be upgraded as a whole to adapt to the current power system structure.

The stability of the grid is tested

In the first half of this year, the scale of renewable energy installations expanded steadily, and it has become the main force in my country's new power installed capacity. According to the data provided by the National Energy Administration, in the first half of 2022, my country ’s renewable energy power generation installation machine was 54.75 million kilowatts, accounting for 80%of the country's new power generation installed capacity. Among them, hydropower adds 9.41 million kilowatts, 12.94 million kilowatts of wind power, 30.88 million kilowatts of photovoltaic power generation, and 1.52 million kilowatts of biomass power generation, respectively, accounting %. As of the end of June 2022, my country's renewable energy power generation machine reached 1.118 billion kilowatts. Among them, 400 million kilowatts of hydropower installed machines (including 42 million kilowatts of water storage), 342 million kilowatts of wind power installation machines, 336 million kilowatts of photovoltaic power generation machines, and 39.5 million kilowatts of biomass power generation machines.

Under the wave of construction and other projects such as scenery bases, the proportion of renewable energy in my country's power system is increasing, and the importance is increasingly prominent. Recently, at the 4th Future Energy Conference hosted by the China Energy Research Association and China Energy Network, Pi Ri, deputy director of the Energy Renewable Energy Center of the National Development and Reform Commission, said that last year, the energy and power supply had been tight in China. Combined with the current situation Under the situation of Russia and Ukraine, fossil energy prices are in a high level. Through the construction of large bases, China has regarded the development of new energy as an important means to ensure national power security, which can help China's economic growth.

However, with the increase of renewable energy power generation, the volatility of the power supply side increases, and the power grid has been tested in terms of security and stability. Zhang Yanhu, vice president of Sunshine New Energy Development Co., Ltd. told the reporter of Huaxia Times that new energy has weaknesses such as volatility and accidentality. Energy change puts forward new requirements for the power system. It becomes more gentle, and can be integrated with optical storage fusion, wind storage fusion, landscape hydrogen storage, and landscape storage and hydrogen.

“新能源大规模发展的前提下，新型电力系统的底层逻辑发生了变化。”博众智合能源转型论坛中国电力高级顾问尹明告诉《华夏时报》记者，新型电力系统的目标很明确，就是Increasing the development and utilization of new energy sources, in the process of gradually increasing the proportion of new energy, reconstruct the corresponding technical system, standard system, market system, regulatory system and value system.

Yin Ming mentioned that in the traditional power system, the stability of coal power is extremely high and can be regulated and controlled. However, under new circumstances, the scenery power generation "blooms all sides". There are many "bitterness" in the power grid company. It takes a long time to build a line, but it is enough to get a wind farm and a photovoltaic power station for two or three months. The power supply has become increasingly uncontrollable, intermittent and variable are stronger and stronger, the diversity of the load side increases, and the uncertain factors of the system are superimposed. In addition, the problem of power and electricity balance is prominent, the penetration rate of new energy, the total carbon emissions and the intensity of carbon emissions are all things that need to be considered.

Improve the flexibility of the power system

Since the beginning of this year, renewable energy power generation has increased steadily. According to the data provided by the National Energy Administration, in the first half of 2022, the country's renewable energy power generation reached 1.25 trillion kWh. Renewable energy continues to maintain high utilization level. In the first half of 2022, the use of water use rates in major basin nationwide was about 98.6%, an increase of 0.2 percentage points from the same period last year; the average use rate of wind power in the country was 95.8%, a decrease of 0.6 percentage points from the same period last year; , Decreased by 0.2 percentage points from the same period last year.

Under the new situation, different types of energy in the power system require more deeper integration and penetration. Xue Wu, general manager of the emerging business department of Southern Power Grid Corporation, said that the consumption demand of the terminal is becoming increasingly diversified. Facing development bottlenecks, technical barriers and information barriers, the interaction between the industry is more difficult, especially after a large amount of renewable energy penetration increases, the difficulty of supply and demand balance of the power supply has further increased.

"The development of new energy requires a more detailed layout and portrayal." Treatment of the analysis, when building a large -scale landscape base, it is necessary to support the construction of a clean and efficient and advanced coal electrical unit, and a stable and reliable UHV transmission. Coal electrical units can be used as a supporting power supply, and optimized allocation nationwide through UHV transmission channels. It is necessary to respect the current stage of the development of the power market and encourage coal -electricity companies and new energy companies to jointly. Comprehensively enhance the flexibility of the power system and reduce the difficulty of the localization of new energy. How to improve the adaptability of the power system to the large -scale and high proportions of new energy networks and consumption? Xue Haijun, the chief expert of Shuangliang Energy -saving, said that the large -scale and high -scale accessing power grid of new energy has brought great challenges to the security and economy of the power system. Perform flexible transformation, participate in peak adjustment work in depth, but also use the method of pumping water storage and new energy storage to meet the overall requirements. In terms of the flexibility of thermal power, through the new technologies of intelligence, the thermal efficiency of the generator set can be improved, and the economic potential of the air -cooled system is great.

Digital empowerment of power system

What role will digital technology play the security, reliability and efficiency of the future power system? What dimensions will it support the power industry to support the power industry?

Wang Zhao, the architect of Schneider Electric Energy Management Grid, said that the reliability of traditional power is to reduce the incidence of faults and shorten the failure recovery time, which is inseparable from digital empowerment. Under the new power system, we must make full use of the characteristics of distributed energy to provide distributed elasticity for the power system. Digitalization can give more support in the flexibility transformation of power supply, virtual power plants, demand -side response and other aspects, and coordinate the control and control through digital systems to do more work for the energy or electrical energy of the power system for future demand -side power systems.

Yin Ming analyzes that digital information can make the systems and power grids, power grids and users, power and users, and the upstream and downstream of the industrial chain are more open and transparent. Relevant departments should attach importance to the management and application of data in the field of energy and power, and fully tap and use the potential of data resources, which will make the market more efficient and promote energy power to clean, green, safe, and efficient direction.

Zhang Yanhu said that in the scenario of photovoltaic power generation, electricity needs to rely on photovoltaic inverters to connect to the grid. It must fully reflect the friendship of the grid. The inverter needs to improve the ability to solve the system failure and support the stability of the grid. From a system perspective, the inverter should make the curve more smooth after the combination of scenery. With the unclear energy storage profit mechanism, the value of energy storage is maximized. For example, when the optical storage power station cannot generate electricity at night, use the cheap electricity at night during the day to reduce the cost of self -consumption of power stations. In addition, it can also improve the predictive ability of new energy power stations, so that the comprehensive force of optical storage and the power generation forecast curve of the upload scheduling scheduling can be perfectly fitted to achieve closed -loop tracking.

Editor -in -chief: Zhang Bei Editor: Zhang Yuning

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