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Nanrui Power Distribution Company's "active orphan network" capability test succeeded
[ Instrument Network Instrument Development ] On May 9, 2019, Tongli Integrated Energy Center's "active isolated network" test successfully passed the capability verification experiment of the State Grid Jiangsu Power Organization. The test was organized by the State Grid Jiangsu Electric Power Company and cooperated with the Chinese Academy of Electric Power, Nanrui Group, Xuji Electric and other units. It took nearly three months to make full efforts.
In December 2016, State Grid Corporation and the Suzhou Municipal Government signed a cooperation agreement to support the construction of a model city for Suzhou's international energy transformation and development, and to create a demonstration city for energy innovation in Suzhou. Tongli Integrated Energy Service Center is the most important comprehensive demonstration project in Suzhou Innovation Demonstration Zone. It plans to build a number of world-class energy innovation projects, focusing on the core elements of the future urban energy system, and demonstrating the new concept of future urban energy supply and new forms of energy allocation. , a new model of energy consumption, a new experience in energy services, and a demonstration zone for free energy exchange in the future.
“Association Control System†is the “neural center†of the power grid that coordinates resources. Through the real-time scientific regulation of “source-network-load-storage†resources, it effectively supports the safe and reliable operation and comprehensive energy efficiency utilization of the service center distribution network. . In the functional design, the cooperative control system mainly has the interactive response capability between the three major active grids, the “active gridâ€, the “demand response†and the “emergency supportâ€. Among them, the “active orphan network†is the core and difficult point of the three capabilities.
The ability of "active isolated network" is simply that when the external power supply is at risk, the regional distribution network is actively supported by the internal power supply, and actively moves away from the large power grid for autonomous operation, achieving balance and stable operation of the internal power supply; when the external power supply is eliminated And then take the initiative to carry out the process of grid connection. The application of this technology can greatly improve the reliability and operational flexibility of the distribution network in the future.
When the external power grid is in danger, the regional distribution network is supported by external power supply, and actively enters the large power grid for autonomous operation, realizing the supply and demand balance of the external power grid, and operating steadily; when it is eliminated, it will actively connect to the power grid at the same time. Use this process, or reliability and operational sensitivity in the future of large elevator distribution networks.
The "active isolated network" test of the Tongli Integrated Energy Center realized the operation of the Tongli Integrated Energy Service Center on the medium-voltage 10kV side, and also realized the seamless and off-grid switching of the medium-low voltage AC-DC distribution network for the first time. . The coordination control system utilizes the energy storage resources of the Tongli Integrated Energy Service Center to support the voltage of the AC medium voltage distribution network through the DC low voltage distribution network, and realizes the off-grid operation of the service center through the equipment and the switch. The fast switching cooperation realizes that the low-voltage load is not perceived during the grid-connected off-grid and the synchronous grid-connected process.
The test has a number of innovative applications of technology, and provides a new technical solution for the operation and management of medium and low voltage DC distribution network, which is of great significance to the operation and management of the distribution network in the future.
(Source: China Electric Power Research Institute, China Energy Network, State Grid News)