Smart Grid - Distribution Automation System

The Smart Grid Comprehensive Demonstration Project in Jiangsu Yangzhou Economic and Technological Development Zone under the general contracting of the National General Electric Nanrui Technology Co., Ltd. (abbreviated as Guodian NARI) under the NARI Group gives us a vivid demonstration of the smart grid belt, so that the smart grid is no longer with us. Far away, give us practicality and convenience.

The reporter learned that the project has fully applied the latest technologies and achievements of the State Grid Corporation of China in the field of smart grids, implemented the technical route that the smart grid in the urban area should follow, and built a total of 11 sub-projects of smart grid integrated demonstration projects covering the power system. The transmission, transmission, change, deployment, use, dispatch, and communication links fully reflect the smart grid practice in smart cities.

Photovoltaic power generation smoothly connected to the power grid Green energy can be “The demonstration project has built a 10 kV distributed photovoltaic grid-connected grid and micro-grid operation control system, enabling distribution power grid connection power curve tracking, maximum utilization of clean energy, and optical storage. The coordinated adjustment of multiple operating modes and operating states, such as joint economic dispatch, optimized operation of off-grid optical storage, and smooth switching of off-grid networks, enables the friendly access of distributed photovoltaic generation, interaction between distributed generation and distribution networks, and Support each other and improve the distribution network's ability to accept distributed power.” The head of National Power Nanrui Field Technology told this reporter that “the system has two bright spots. The first is the intelligent joint scheduling of optical storage to stabilize new energy power generation. Volatility, and second, the scheduling of optical storage power stations to participate in the distribution network feeder automation, improve the reliability of important users of power supply."

The output of photovoltaic power generation is affected by the weather, and changes with the change of the light intensity, which is an unstable power supply to the grid. The project rationally allocates energy-storage batteries according to the installed capacity of distributed photovoltaic power generation, and modifies the volatility of new energy power generation through intelligent joint scheduling of optical storage. This is like deploying a “reservoir” for “trickle flow” to adjust the remaining deficiency. It enables distributed new energy generation to be connected to the grid flexibly and friendly, breaking the technical threshold for distributed new energy generation to connect to the power grid, and greatly promoting the development of distributed photovoltaic power generation. At the same time, grid-connected optical storage power stations provide new power points for distribution networks. When the 10 kV distribution line is unable to supply power due to maintenance or faults, the optical storage power station can be used as a backup power source to accept the automation of feeders dispatched by the distribution automation master station to participate in the distribution network. The optical storage power station and the surrounding load can form a micro network. Operation, reducing the time of power outage of the peripheral load and improving the reliability of its power supply.

Smart grid, eye-sighted six-way, ear-listening reporters deployed in Yangzhou smart grid integrated visualization platform in the dispatch control center of Yangzhou Power Company saw a 3×8 total of 24 70-inch DLP display screen as a carrier to fully demonstrate Yangzhou intelligence Power grid demonstration project construction results and various links. According to reports, the platform is the first comprehensive smart grid application platform integrating research and development of smart power grids, integrated service simulation and interactive display, and real-time/quasi-real-time monitoring of power grids. It is just like the human brain that realizes transmission and distribution. Comprehensive information sharing and real-time dynamic display of each link of change, match, use, and dispatch, and comprehensive analysis of multi-system data, using 3D virtual reality technology, FLEX, dynamic simulation technology of power system, intelligent video analysis technology, etc., through real-time online analysis With offline simulation and simulation of various means, with the power grid business as the core, in-depth data mining is performed on each link to achieve integrated application, comprehensive analysis, full-range, panoramic, and full-dimension visualization, which enhances the staff's ability to control and determine the power grid. Provide intelligent decision-making for grid operation management.

Magical and Sensitive Distribution Automation System For a long time, the relevant staff is often struggling to eliminate a point of failure on the line, and has a distribution automation system that can help you locate the point of failure within 15 seconds. The project leader Shen Haodong introduced that the distribution automation system is the core of this demonstration project. It mainly adopts the mode of intelligent distributed feeder automation and master station centralized feeder automation. In layman's terms, when the intelligent distributed feeder automation mode is used, if the distribution line fails, only 200 milliseconds can be used to automatically detect and locate the fault point through the signal exchange between the intelligent distribution terminals, automatically tripping the fault point two The side switch automatically completes fault isolation, and then the power distribution automation master station system remotely closes the contact switch to restore power in the non-faulty area. When the main station centralized feeder automation mode is adopted, if the distribution line fails, the master station can locate the fault point within 15 seconds, and the remote control trips the switches on both sides of the fault point to realize fault isolation, and closes the switch and contact switch of the substation 10kV outlet. Restoring power in non-faulty areas, the implementation of the entire package is less than 3 minutes.

At present, the coverage rate of the distribution automation system in the demonstration area has reached 100%, realizing the real-time monitoring of the operation status of the power supply equipment, greatly shortening the time for troubleshooting, and improving the efficiency of equipment use. On average, it can save nearly 3 million equipment investment per year. Yuan, with an operating cost of nearly 1.5 million yuan, effectively increased the economic benefits of the region and reduced the corresponding transmission and distribution investment. The demonstration project also built power transmission and transformation equipment status detection systems, smart substations, power quality monitoring, power consumption information collection systems, smart communities, electric vehicle charging and replacing facilities, smart parks, communication information networks and security systems.

It is understood that the Smart Grid Comprehensive Demonstration Project in Jiangsu Yangzhou Economic and Technological Development Zone is one of the pilot projects for the State Grid Corporation to build a strong smart grid, and it is also a demonstration project that embodies the concept of “Smart City”. The project construction can promote the establishment of energy production methods and consumption methods that meet the requirements of sustainable development, optimize the energy structure, increase the proportion of clean energy, promote industrial upgrading, develop low-carbon economy, and build a resource-saving, environment-friendly, socially harmonious model. Cities and effective responses to the challenges posed by global climate change are of great significance.