Safe, reliable, cost-effective, flexible and interactive, green is the development goal of smart distribution network. So, how to meet these goals? There are ten key technologies that support and realize the goal of smart distribution network development. At the Energy Lecture Hall, Liang Ying, Chief Engineer of China Electric Power Research Institute Institute of Power Distribution shared these ten technologies.
1. Active distribution network planning technology
The concept of an active distribution network was proposed by the International Conference on Large Power Grids in 2008, which means a public distribution network with a flexible topology that actively controls and actively manages distributed power supplies, energy storage devices and customer bidirectional loads. Compared with traditional technologies, active distribution network planning technology has flexible technical standards, centralized management mode and flexible network structure.
2 smart distribution equipment technology
In smart distribution networks, devices are the key hardware infrastructure. Liang Ying believes that this technology is mainly used in power equipment, the equipment has the status of perception and information transmission functions, such as smart state sensors , intelligent electronic transformers. The design of intelligent distribution equipment should be integrated, with the features of reliable performance, modularity and standardized interfaces. Therefore, the intelligent distribution equipment is an integrated equipment integrating acquisition, control and protection functions.
3. Communication and information support technology
Intelligent devices have communication capabilities, which requires communication and information support platform, which plays an important role in the intelligent distribution network self-healing control.
4. Intelligent distribution network self-healing control technology
This technology enables distribution networks to be self-contained, self-healing and self-controlling. With the access to distributed power and EV charging and discharging facilities, as well as the continuous expansion of distribution network, the complexity of distribution network is constantly increasing, and the traditional distribution network without self-learning and adaptive capability has been unable to adapt to such situation Complex situation, but only self-learning, adaptive, in order to meet the requirements of smart distribution network to achieve the risk of pre-accident risk and self-immunity.
5. Intelligent distribution network energy scheduling technology
Distribution network energy scheduling refers to the distribution network through the production, transmission and distribution of energy to monitor and manage in order to achieve distribution network energy balance, to ensure safe, reliable and efficient operation.
6. Intelligent distribution network energy efficiency management technology
The distribution network has a long history of "big horse car" situation, the load rate is low, reactive power consumption, line loss, and therefore require smart distribution network energy efficiency management technology. Intelligent distribution network energy efficiency management refers to the customer's electrical equipment, micro-grid access devices, such as unified management and collection of electricity information, the development of electricity policy, to achieve energy-saving emission reduction purposes. Energy management control technology can effectively curb the load curve, reduce grid investment, to achieve the purpose of energy saving.
7. Intelligent distribution network interactive service technology
The technology is the use of intelligent measurement, efficient control, high-speed communications, energy storage and other technologies, to achieve power grid and customer energy flow, information flow, business flow real-time interaction.
8. Distribution Network Simulation Technology
In the real distribution network, there are many data bulk, complex structure, difficult calculation, the establishment of mathematical models there are also inaccurate problems, which requires the use of real-type system or physical device simulation, the establishment of distribution network simulation technology .
9. Distributed power grid and micro-grid technology
The future distribution network will accommodate a large number of distributed energy sources, requiring distributed power grid-connected and microgrid technologies. Liang Ying believes that distributed power supplies have a gap and their large-scale access will bring a series of problems to the power distribution network, such as power quality problems, islanding problems, reliability and stability issues, as well as distribution network adaptability Problem, which also prompted profound changes have taken place in the existing technology of the distribution network. At the same time, profound changes have taken place in the energy consumption structure and service requirements of the customer terminal. The intelligent power distribution network has taken the initiative to change the gap energy from passive to active, achieving the optimal coordination of the whole network through the participation and disengagement of the self-organizing network.
10. Electric vehicle charge and discharge technology
There are three impacts on the distribution network of EV charging and discharging facilities: First, the charging of electric vehicles will lead to the increase of load. A large amount of disorderly charging will aggravate the peak load and discharge peak of the power grid and increase the burden on the power system. Second, the uncertainty of the customer's electricity usage and charging time and space distribution, randomness and other characteristics will increase the difficulty of grid control. Third, the electric vehicle charging load is a non-linear load, a large number of power electronic equipment and the grid will produce a certain degree of harmonics, causing power quality problems. Therefore, the need to strengthen research on electric vehicle charge and discharge technology.
1. The elevator is equipped with landing door, car running direction indicator, mathematical display car, running position indicator and call elevator button at each service landing. When the elevator call button is used, press the up direction button when going upstairs and press the direction button when going downstairs.
2. When the car arrives, the floor direction indicator will display the movement direction of the car. Passengers can enter the car after judging the direction they want to go and confirming that the elevator is normal. Pay attention to the closing of the door leaf and do not stay at the junction between the landing door and the car door.
3. The car is equipped with position display, control panel, door opening / closing button and floor selection button. After entering the lift car, lift and press the floor selection button to go to the floor. To close the car door immediately, press the door closing button. The car floor position indicator shows that you can leave after arriving at the floor and the car door is opened.
4. The rated load of the elevator is limited and cannot be overloaded. Please take the initiative to exit when the personnel are overloaded.
5. The passenger elevator cannot be used as a cargo elevator, and it is absolutely not allowed to transport inflammable and explosive goods.
6. In case of abnormal phenomenon or failure of the elevator, keep calm, call the rescue phone in the car, and do not pry the door without authorization to try to escape from the car.
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