Yesterday (June 6), China's first UHV project for the transmission of wind power photovoltaic bases in desert, Gobi and desert areas - Ningxia to Hunan ± 11 kV UHVDC transmission project began construction.

Promote the integration of clean electric energy into the grid and consumption of "Shago Waste"

The total investment scale of "Ningdian into Xiang" project is about 1000 billion yuan, starting from Zhongwei, Ningxia, passing through Gansu, Shaanxi, Chongqing, Hubei, Hunan and other five provinces (regions) and a city, the total length of the line is 1634 kilometers, the project mainly transports green electricity and clean electricity produced by clean energy such as solar energy and wind energy in desert, Gobi and desert areas, becoming an innovative project in Ningxia facing the goal of "dual carbon", realizing a high proportion of stable transmission of new energy, and building a new power system, Demonstration project to realize the large-scale optimal allocation of new energy.

It is understood that the installed capacity of the supporting power supply of the "Ningxia Power into Xiang" project totals 1764.1400 million kilowatts, which will promote the transmission capacity of Ningxia's power grid from 2200 million kilowatts to 5000 million kilowatts, and the installed capacity of new energy will exceed 360 million kilowatts, greatly driving the local consumption of new energy in Ningxia and the large-scale optimization of new energy, and fundamentally solving the problem of new energy grid-connected consumption in central and southern Ningxia. After the project is put into operation, it will increase the electricity consumption of Hunan by 400 billion to <> billion kWh every year.

"Green Line" ecological governance makes the electric tower more solid

The "Ningdian into Xiang" project is the first large power channel in China to develop desert photovoltaic and transmit new energy. So, in the process of pre-planning and the current stage of construction, what problems did the construction party encounter? And how is it solved?

The total length of the "Ningdian into Xiang" project is 1634 kilometers, and the Ningxia section has 261 kilometers, of which 68% of the lines pass through desert, Gobi and desert terrain, which means that some power towers need to be built in the "Shage Wilderness" area, and the sparse vegetation in the area, the complex terrain, coupled with the invasion of wind and sand, will make the power tower have the risk of collapse, threatening the safe and stable operation of the transmission line

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In order to solve this problem, the project builder drew on the previous UHV operation and maintenance management experience and launched the "Green Line" plan.

Zhang Xiaobo, team technician of the Science and Technology Innovation Center of State Grid Ningxia Electric Power Ultra-high Voltage Company: We consulted some forestry and sand control experts, transformed the sand dunes into fixed or semi-fixed sand through the grass square, and at the same time sowed some grass seeds in the grass square, planted plants such as lime seedlings, and slowly restored the vegetation environment of the channel.

"New energy + energy storage" ensures the stability of grid-connected electric energy

In addition, the engineering construction team also explored the "new energy + energy storage" technology to solve the technical problems of new energy instability.

Zhang Shaobin, deputy director of the customer service center of State Grid Ningxia Electric Power Zhongwei Power Supply Company: The size of wind power and wind power determines the power generation efficiency. New energy power generation is greatly affected by the natural environment, and its intermittency and volatility also put forward higher requirements for the power grid.

In order to grasp the law of new energy power generation, Ningxia's power department has increased scientific and technological research, developed and established an early warning system, and used artificial intelligence to process and analyze massive data to monitor the operation of new energy power in real time.

At the same time, in order to ensure the stable transmission of new energy electricity, Ningxia Power System continues to tackle the "new energy + energy storage" technology to provide strong support for project construction.

Zhang Huiling, deputy director of the control center of State Grid Ningxia Electric Power Co., Ltd.: Energy storage technology is actually like a charging treasure, which can store excess electrical energy, and can achieve rapid charging and discharging when the power grid needs it. When it is difficult to absorb new energy, we arrange energy storage and charging; When the power is insufficient, discharge is carried out.