The "12th Five-Year Plan" of the "Power Grid" puts forward three goals of safe, reliable, high-quality, high-efficiency and flexible interaction for smart distribution networks. One of its core contents is to make the distribution network have higher power supply reliability and self-healing. (Refactor) function to minimize the impact of power failure on the user. From this we can infer that the solution to the current lack of reliability in power supply and improve power quality is the key to the future development of distribution networks.
There is no doubt that intelligent distribution networks can take up this function, but we must realize that with the new energy access, electric vehicles and charging stations playing an increasingly important role in the future improvement of the environment, the existing distribution network has Increasingly complicated, its control protection has long been distinguished from the traditional distribution network, and the development of distribution networks is moving toward the “active distribution networkâ€.
The development trend of the distribution network is to emphasize the stability control and power quality under the state of bidirectional power flow after the introduction of distributed energy, emphasize user interaction, and with the increase of measurement points and real-time requirements, the back-end software will face real mass data, and the mobile Internet Technology also enables patrol, maintenance, overhaul and remote office integration (active distribution network).
The possible future directions of the distribution network are: convergence of distributed smart microgrids and distribution networks; ring distribution networks (revolution of relay protection); DC distribution networks and hybrid AC/DC distribution networks.
The specific directions are as follows: 1. Strengthen monitoring. The use of more economical, reliable and advanced sensing, communication and control terminal technologies enables real-time and comprehensive monitoring of distribution network operation status, asset equipment status, and power supply reliability status to achieve observability of the distribution network. 2. Improve reliability and power quality. Study the theory and method of intelligent distribution network control, realize self-healing control of power grid, study the integration of distributed power supply into the operation control and protection technology of distribution network, optimize the coordination and dispatching of various links in transmission and distribution, and study the use of power electronics technology to achieve electrical energy Quality control and flexible distribution of electrical energy, reducing losses, improving power supply reliability and power quality. 3. The National Grid Corporation's positioning of smart distribution networks: basic considerations for covering all distribution network equipment; comprehensive utilization of information resources as an important means; distribution network scheduling/production command as the main application; to improve the distribution network management level main purpose.
Smart Distribution Network Investment Logic
The goals of the smart distribution network include three aspects: reducing losses, ensuring power quality and reliability of power supply. Since power quality and loss are mutual, loss is often accompanied by a drop in voltage quality. Therefore, the goal of smart distribution networks is to improve power quality and improve reliability of power supply.
Energy saving and intelligence are the persistent topics in the power grid. Grid companies pay more attention to power supply reliability issues, and energy conservation issues are more of a user's consideration. The premise of many energy-saving is the improvement of power quality. We put the consideration of smart direction at the top of investment. Specifically, improving the reliability of power supply includes on-line monitoring of power distribution equipment and distribution automation.
We expect the distribution automation market to reach 30 billion yuan in 2013, 34 billion yuan in 2014, and 38 billion yuan in 2015. Among them, the intelligent terminal (FTU/TTU/DTU) is expected to reach RMB 1.6 billion in 2013, RMB 2.2 billion in 2014, and RMB 3 billion in 2015; distribution network management system is expected to reach RMB 1.2 billion in 2013 and RMB 1.5 billion in 2014 Yuan, which reached 2 billion yuan in 2015; other RMUs, outdoor pillar vacuum switches, and smart transformers are expected to total 27.2 billion yuan in 2013, 30.3 billion yuan in 2014, and 33 billion yuan in 2015.
Another major market is the online monitoring market for distribution equipment, including on-line monitoring systems for distribution cables (feeders), on-line monitoring systems for distribution switches, on-line monitoring systems for distribution switchgear, on-line monitoring systems for distribution transformers, and power quality of distribution networks. Online monitoring system. We estimate that the market capacity for on-line monitoring of distribution networks is about 1 billion yuan, which will increase at an annual rate of about 10%.
Other opportunities for attention
Future opportunities for smart distribution networks include: total solution provision in distribution networks, application of the Internet of Things concept in distribution networks, single-phase ground fault location technology in distribution networks, personal safety protection in distribution networks, and direct current Solutions for distribution network and related issues, and development and promotion of energy storage batteries.
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