New economic orientation
Original title: During the summer peak this year, the country's highest power load is expected to grow by more than 100 million kilowatts year-on-year (topic)
Ensuring power supply in hot weather (theme)
Ding Yiting Zhang Weixiong
Recently, a large range of high temperature weather has occurred in northern China, and the power load has increased rapidly. Wang Xinming, chief engineer of State Grid Hebei Electric Power Dispatching and Control Center, said that on the evening of June 12, the air-conditioning load of Hebei Power Grid increased by 108% year on year; At the same time, the impact of extreme weather may increase, and the rapid switching between sunny and hot, rainstorm weather puts forward higher requirements for power grid operation.
According to the data of the National Energy Administration, during the summer peak this year, the country's highest power load is expected to increase by more than 100 million kilowatts year-on-year, which puts pressure on power supply assurance. All relevant parties have tightened their responsibilities, strengthened coordination and linkage, and made every effort to ensure the safety and stability of energy and power supply.
Power supply: coal supply is sufficient, and all kinds of power supply "show their talents"
Coal power is still the main source of power supply in China, and its power generation accounts for nearly 60% of the total power generation in the country.
"Every seven or eight minutes during the peak period, a coal truck starts from here, and from June 1 to 10, the amount of coal delivered exceeds 541000 tons." Song Jun, head of the operation management department of Huaneng Huating Coal Sales and Transportation Company in Pingliang, Gansu, introduced that the enterprise has established an emergency coordination mechanism in advance to ensure the supply of electricity and coal during the summer peak season, and strengthened the loading organization and transportation capacity coordination.
In Jiyuan, Henan, the highest temperature on June 13 exceeded 40 ℃. In the coal storage shed of Huaneng Qinbei Power Plant, there are "coal mountains" transported from Huating Coal Industry and other places. Su Fangwei, director of the production management department of the power plant, told reporters that the coal storage of the power plant can be used for more than 30 days, providing sufficient guarantee for energy use in hot weather.
While coal power supports power supply, clean power sources such as hydropower, wind power and photovoltaic also "show their talents", becoming an important help for energy and power supply.
In the Yalong River Waterscape Integration Base, SDIC Yalong River Company dynamically optimized the maintenance arrangements to ensure the safe and stable operation of power equipment. "We give full play to the advantages of the 'one river' joint dispatching, and seize the relatively abundant incoming water since May. As of May 31, the Yalong River cascade joint operation and energy storage has reached 7.38 billion kilowatt hours, an increase of more than 6.2 billion kilowatt hours on a year-on-year basis, providing power security for Sichuan, Chongqing, East China and Central China." Nie Qiang, deputy chief engineer of Yalong River Company of SDIC Group, introduced.
On May 30, Chongqing Panlong Pumped Storage Power Station of State Grid Xinyuan, the first megawatt large-scale pumped storage power station in southwest China, was put into full operation for power generation; On June 1, the 168 hour test run of Unit 6 of China Huadian Qingdao Gas Turbine Project was successful. Compared with ultra clean coal-fired units of the same installed scale, the project can reduce carbon emissions by about 60% annually; In Shandong, the power sector served 8.21 million kilowatts of new energy power generation installed capacity and 1.52 million kilowatts of energy storage power station connected to the grid before the summer, injecting new clean energy into power security.
The relevant person in charge of the China Electricity Council said that this year's new power generation capacity will continue to grow rapidly. By the end of the year, the proportion of new energy power generation capacity in the total power generation capacity will rise to about 40%, and the power supply capacity will continue to improve to provide solid support for the summer peak.
Power grid: strengthen operation monitoring and promote construction of key projects
Power can be delivered even if it can be delivered. At one end is massive power supply, and at the other end are thousands of households. The power supply guarantee for peak summer is inseparable from the fine dispatching and reliable supply of the power grid.
Emergency disposal is on standby at any time. In Beijing, State Grid Beijing Electric Power deployed 70 emergency rescue stations and 22 power emergency rescue teams on standby, and strengthened the operation monitoring of key substations and transmission lines relying on intelligent power supply service command system and other platforms; Open 24-hour emergency power transmission service to facilitate people to purchase electricity. In Hebei, State Grid Hebei Electric Power and State Grid Jibei Electric Power carried out a joint anti accident drill for summer Jinan large-scale blackouts in peak time around seven scenarios, including power supply guarantee and grid equipment failure; Tangshan relies on the "panoramic perception+intelligent control" inspection system of substation equipment, "manual inspection+drone flight inspection+remote monitoring" of transmission lines, etc., to strengthen the power grid operation guarantee, and emergency equipment is distributed according to the support area to prepare for emergencies at any time.
Cross provincial power transmission is complementary. Recently, Zhejiang and Anhui provinces signed the 2024 peak summer electricity replacement and mutual aid agreement. From July 1 to August 31, the power grids of the two provinces will "work together" to support each other's electricity: from 18:00 to 19:30 every day, Zhejiang's photovoltaic power generation will weaken, and the power supply situation is relatively tight, so Anhui will send power to Zhejiang; From 20:30 to 22:00, Zhejiang will send power to Anhui during the evening peak power consumption in Anhui. Give full play to the role of the platform for optimizing the allocation of resources in the large power grid, make use of the "time difference" of power consumption peaks in different regions, and carry out inter provincial surplus and shortage adjustment, which can significantly improve the power supply capacity of the whole network.
We will accelerate the construction of key projects. The unloading and installation of the reactor weighing more than 20 tons, the installation of the main transformer fan and the fire pipeline are carried out simultaneously... At the 500 kV Shaping substation in Changsha, Hunan, the staff are carrying out capacity expansion and transformation of the main transformer, which is planned to be put into production in late June. After the production, the power supply capacity of the northern urban area of Changsha will be increased by about 1/3. The State Grid Corporation of China orderly promoted the construction of 153 key projects to meet the peak and spend the summer, ensuring that the projects were put into production on schedule, and ensuring the safe operation of the power grid and reliable power supply.
Distribution network is the end "capillary" of power supply. This year, Guangdong Power Grid Corporation of China Southern Power Grid has constructed more than 7400 distribution network projects. "These projects have been completed before the summer peak, mainly distributed in urban load intensive areas and power grid weak areas in the east and northwest of Guangdong, with a cumulative increase in power supply capacity of more than 2.18 million kilowatts, which is equivalent to the addition of power load supply in a medium-sized city, improving the reliability of the 'last kilometer' of power transmission to households." Huang Weijie, general manager of the company's infrastructure department, introduced.
Power consumption: guide electricity conservation and tap the potential of demand side regulation
In addition to the power supply side and the grid side, reasonable and feasible technical, economic and management measures can be taken to tap the regulation potential of the demand side, which can also relieve the pressure of peak power supply. Seen from the power operation for many years, the peak load with an annual power load of more than 95% in China only occurs for dozens of hours. If the peak power consumption can be properly avoided in these dozens of hours, the peak power generation resources of more than 50 million kilowatts can be saved.
The power industry further improved the peak valley TOU price policy, increased the scope of promotion and implementation ratio, and guided users to use electricity at off peak times. Continuously explore and innovate power demand side management, carry out the construction of real-time demand response capability led by flexible regulation in the fields of commercial building air conditioning, user side energy storage, electric vehicle charging pile and big data center, and strengthen fine load management.
"We signed a response load of 10000 kilowatts, and actively reduced power consumption during peak power consumption. Even if we responded to 80% of the load, there would be a subsidy of about 60000 yuan a day." This year, Anhui Bozhou Hongyang Construction Technology Co., Ltd. signed a power demand response cooperation agreement with the State Grid Bozhou Power Supply Company, Song Junshan, director of the engineering department of Hongyang Construction Technology Co., Ltd., calculated the account for the reporter. State Grid Anhui Electric Power has signed a contract with 12000 users for the active peak load shifting resource database, with a response capacity of more than 4.5 million kilowatts, accounting for about 8% of the province's highest power load.
Promoting electricity conservation in the whole society is also an important measure to relieve the pressure of electricity peak in summer. The relevant person in charge of the China Electricity Council said that when the air conditioner turns on refrigeration, if the setting value is 26 degrees Celsius, the cooling load can be reduced by about 10% every time the temperature is increased by 1 degree Celsius, which is very useful for reducing energy consumption and carbon emissions, and people's sense of body can also accept it.
Through comprehensive research and judgment, during the summer peak season this year, the national power supply is generally guaranteed, and there may be tight power supply in some areas during peak hours. Next, how to better ensure the safe and stable supply of electricity for summer peak?
Zhang Xing, spokesman of the National Energy Administration, said that it would strengthen the monitoring and early warning of energy and power, closely follow up the situation of power consumption, water supply, power coal, unit output, etc. in the country and key regions, and timely coordinate and solve problems found; Guide power grid enterprises to optimize operation scheduling arrangements, dig deep into the potential of inter regional and inter grid surplus and shortage, fully release the capacity of various power sources and transmission channels, and promote the effective use of new energy storage; In addition, we will accelerate the construction and production of supporting power sources, guide local governments to make detailed and practical work plans, and resolutely ensure that people's livelihood uses electricity.
