Photo: Courtesy of State Grid Qingdao Power Supply Company On October 8, Zhou Maoxin, zone manager of the SCO Demonstration Area power supply office under the State Grid Qingdao Power Supply Company, inspected the pilot-built SCO “Autonomous Microgrid” to ensure its stable operation. This digital and intelligent “Autonomous Microgrid” has created a replicable and scalable model for building a secure, controllable, smart and user-friendly new power system, Zhou said. Using AC/DC flexible interconnection technology, the SCO “Autonomous Microgrid” connects a 200 kVA power supply office zone and a 630 kVA public charging station zone within the SCO Demonstration Area. Given the differences in load characteristics between these zones, which include distributed photovoltaic (PV) systems, charging piles, and energy storage devices, a three-tier management structure has been established. This structure includes strategy customization, coordinated control, and local execution, enabling three key functions: mutual power supply between zones, collaborative operation of “main, distribution, and micro” grids, and sub-second power restoration. When an overload occurs in the interconnected zones of the SCO “Autonomous Microgrid,” an alarm threshold is triggered, switching to the AC/DC hybrid interconnection mode. Surplus capacity from adjacent zones is smoothly transferred, achieving dynamic load balancing and avoiding peak overloads. […]
State Grid Qingdao Power Supply Company’s ‘Autonomous Microgrid’ Speeds up Digital Transformation of Distribution Network
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