Smart grid to provide strong power support

On May 25, the Guangdong-Hong Kong-Macao Greater Bay Area DC back-to-back power grid project was officially put into operation, which is expected to support the "west-east power transmission" of no less than 188.3 billion KWH this year; On June 30, Zhejiang Changlongshan pumped-storage Power Station, the largest pumped-storage power station in East China, was put into full operation, and this giant "charging treasure" undertook the tasks of peak load and valley filling of the grid. On July 1, the 2080km Baihetan to Jiangsu UHVDC project was put into operation...

Since the beginning of this year, China's electric power infrastructure construction has advanced in an orderly manner. The 11th meeting of the Financial and Economic Commission of the CPC Central Committee pointed out that it is necessary to strengthen the construction of network infrastructure such as transportation, energy and water conservancy, and take networking, network replenishment and strong chain as the focus of construction, and strive to improve network efficiency. As an important driving force of economic operation and a key link of energy transformation, how is the current progress of networking, supplementing and strong chain in the power field? What should we focus on next? The reporter conducted an interview.

The power supply guarantee foundation has been continuously consolidated, and infrastructure networking, network replenishment, and strong chain have become inevitable choices

In recent years, China's power infrastructure has maintained moderately advanced development, and accelerated the transformation of the power system to adapt to large-scale and high-proportion new energy sources.

The scale of installed power capacity and the "west-east power transmission" continued to expand. At present, China's installed capacity of full-caliber power generation exceeds 2.4 billion kilowatts, and the installed capacity of wind power, photovoltaic, hydropower and biomass power generation ranks first in the world for many consecutive years. China has built 33 AC-DC UHV lines, and the scale of "west-to-east power transmission" exceeds 290 million kilowatts.

The level of rural electricity security has been significantly improved. By 2020, all counties in the country will have access to large power grids, and all villages within the coverage of large power grids will have access to power. Rural power supply capacity and reliability have been continuously improved.

The innovation capacity of electric power technology has been rapidly improved. At present, China has established a complete industrial chain of clean energy equipment manufacturing such as hydropower, nuclear power, wind power and solar power. In the first half of the year, China's total export of photovoltaic products was about 25.9 billion US dollars, an increase of 113.1%.

Although the power supply guarantee foundation has been continuously strengthened, some periods and some areas still have tight supply. "14th Five-Year Plan" period, China's electricity load and electricity consumption is expected to continue to grow, need to further strengthen the power supply security capacity; At the same time, in the process of low-carbon energy transformation, it is faced with challenges such as the new power system is still in the early stage of development, and the lack of adaptability to large-scale and high proportion of new energy connections and consumption. To make up for these shortcomings, power infrastructure networking, network, strong chain has become an inevitable choice.

The person in charge of the relevant departments of the National Energy Administration introduced that for the construction of power infrastructure, networking mainly includes the development of UHV transmission channels; The supplementary network mainly includes optimizing and improving the layout of the main power grid, strengthening the transformation and upgrading of the urban distribution network and the construction of strong local power grids, developing distributed smart grids, and improving the power infrastructure in rural and remote areas. Strong chain mainly includes strengthening the security and intelligence level of power infrastructure, making the power system more flexible and intelligent, and promoting the coordination and interaction of source and network load and storage. "Accelerating the networking, replenishment and strengthening of power infrastructure is an inevitable requirement for ensuring national energy security and achieving the target of carbon peak and carbon neutrality on schedule."

Taking networking, networking and strong chain as the focus of construction will also help play the role of investment driving. In June, the State Grid announced more than 500 billion yuan of grid investment this year, reaching the highest level in history, and is expected to drive social investment of more than 1 trillion yuan.

Improve the intelligent level of the power grid to ensure reliable, stable and low-cost power supply

A "White House" stands in Taiping town, Xinxing County, Yunfu City, Guangdong province. Here is the "intelligent brain" of the 10 kV distributed grid of the Southern Power grid - energy storage switching station, which can make the distributed grid flexibly convert between shutdown, grid-connected operation and off-grid operation, and at the same time, it is like a large "charging treasure", which can store 2 megawatts of electricity. According to reports, last year, the local construction of this "source (hydropower) network load and storage" medium voltage distributed grid can realize the full absorption of small hydropower, reducing about 43% of the abandoned hydropower.