At present, the development of UHV has become an important strategic deployment of the State Grid Corporation of China during the 12th Five-Year Plan to build a strong smart grid, and has been included in the national energy development strategy, the national medium and long-term science and technology development plan, and China's national plan to address climate change. After the 1000-kilovolt Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project was successfully put into operation, it has been operating safely and stably, effectively promoting energy-saving emission reduction and optimizing the allocation of energy resources. Zhejiang is a major province of the economy, but it is also a small province of resources. The primary energy source is extremely scarce. In order to guarantee the energy supply for economic and social development, we must accelerate the construction of UHV power grids, implement the “inside-out and out-supply” power development strategy, and establish a safe, adequate, and economic power guarantee system. During the “Twelfth Five-Year Plan” period, the UHV power grids of our province will be built from scratch, and backbone grids will be built. In the province, “three exchanges and two straight” UHV stations will be built, and “three provinces and six lines” will be built across the province to strengthen liaison and increase. Calling capacity outside the area is about 25 million kilowatts. UHV grid will become the backbone of Zhejiang's main grid.
Guest Viewpoint
Shi Xinghua: UHV construction is the first in the history of construction of Huzhou Power Grid and even Zhejiang Power Grid. From the external environment, the project itself, or the construction process, we are faced with some new situations, new features, new problems and new requirements. We must innovate. Management ideas and management methods ensure that the “One Special Four” strategic deployment of the State Grid Corporation is fully implemented.
In order to effectively promote the construction of UHV AC projects, we insist on government-led, government-enterprise linkage, and strive to obtain support from the local government to fully establish a “government-led, harmonious network construction” working mechanism. Huzhou City, counties (districts), and towns and villages along the route have all set up special UHV construction command posts, assigned special personnel to take charge of them, have clear divisions of labor and checks at all levels, fully perform government functions, and promote project construction. At the same time, we resolutely implemented localized management requirements, established an internal UHV construction management mechanism, and formed a triangle-level management from the municipal bureau-county (division) bureau-power supply establishments, fully implementing the municipal, county (district), and government departments. The seamless integration of the three-tier management structure of the township and township enables the government and the enterprise to fully communicate and comprehensively control the policy, work implementation, and on-site coordination, and effectively promote the smooth development of all projects.
Chen Guanxian: Building a strong and reliable smart grid that is safe, reliable, configuration-optimized, interactive and flexible, comprehensive and efficient, and meets demand is an important measure to promote Shaoxing’s economic transformation and upgrading, to fulfill its social responsibility, and to promote the development of a low-carbon economy. To enhance the ability of electricity to ensure the stability of local economic and social development, we must improve the forward-looking nature of power grid development. Due to the lack of primary energy in Shaoxing, there is a lack of large-scale power plants, which is a typical negative-controlled power grid. During the “12th Five-Year Plan” period, coastal power plants mainly meet the demand for power consumption in coastal areas such as Yongtai, and the amount of electricity sent to the Shaoxing power grid will increase. bottleneck.
To this end, in conjunction with the National Grid special high-voltage plan, during the “Twelfth Five-Year Plan” period, Shaoxing Power Grid will plan to build a 1000-kV Zhezhong AC UHV project to solve the problem of Shaoxing power grid feeding into the power supply. At that time, Shaoxing’s 500 kV grid structure and power supply structure will be greatly improved, enabling Shaoxing Power Grid to fully integrate into the optimal allocation of resources in Zhejiang and even across the country, and to promote the sustainable and healthy development of Shaoxing power grid. At the same time, the construction of the UHV supporting 500 kV transmission project will further optimize and improve the 500 kV network structure in Shaoxing and accelerate the deployment of 500 kV substations. By the end of the “Twelfth Five-Year Plan”, 500 kV backbone grids of Shaoxing Grid will be formed. "Three horizontal and two vertical" pattern.
Jiang Xian: In view of Jinhua’s economic development and the current status of the power system, the basic idea and goal of the Jinhua primary grid plan during the “12th Five-Year Plan” period is to use a 500-kilovolt power grid as the core and a 220-kilovolt power grid as the backbone to optimize the main grid structure. , Strengthen mutual support capabilities of the grid to ensure safe and reliable power supply.
According to the national “West-to-East Power Transmission” energy layout, the Xiluodu-Zhexi ±800kV UHV DC project will be completed during the “12th Five Year Plan” period, and the location of the Zhexi Converter Station will initially be selected in Jinhua Wuyi County. We will focus on the construction of UHV DC, optimize the adjustment of the 500 kV grid structure, and ensure the safety, stability, and economic operation of the grid. In order to remarkably increase the absorption capacity of incoming calls from West Zhejiang and other regions, we plan to integrate the 500-kV Ssangyong-Fujian line and the Ssangyong-Wanxiang line into Wuyi UHV converter station, and continue to improve the construction of UHV supporting projects to further enhance Power grid capacity. At the same time, we will focus on researching related technologies for UHV transmission, such as reactive voltage control technology, line overvoltage and its control technology, and controllable compensation technologies, to lay the foundation for the operation and maintenance of UHV power grids.
