China State Grid makes a new breakthrough in DC power distribution technology

BEIJING, June 29, 2021 / PRNewswire / – State Grid Corporation of China (SGCC) achieved new technological breakthroughs in direct current (DC) electricity distribution with the Pangdong DC central station commissioned on Tuesday by State Grid Jiangsu Electric Power Co., Ltd., a subsidiary of SGCC.

Operating for AC / DC conversion and power distribution, the Pangdong station acts as one of the two “cores” of State Grid Jiangsu’s Low and Medium Voltage (LV / MV DC) Demonstration Distribution Project, which is expected to become one of the world leaders in LV / MV DC distribution system with the largest scale, full voltage levels as well as the latest technical equipment when completed in August.

Photo: Staff of State Grid Suzhou Power Supply Company begins transmission of electricity from Pangdong Central Station No. 1 Conversion Valve on June 29, 2021 in Suzhou, east China’s Jiangsu Province .

Classified as a key national R&D project in 2018 with the start of construction last May, the demonstration project is applied and undertaken by State Grid Jiangsu. He built two DC central stations (“cores”) in Pangdong and Jiuli in the Wujiang Economic Development Zone in eastern Suzhou City. from China Jiangsu province to build a LV / MV DC system covering various scenarios such as municipal, industrial and commercial and domestic uses. With a cumulative DC load of 10.5MW, the system is capable of different DC outputs at 10KV, 750V and 375V to meet different power demands.

The new Pangdong station, for example, could convert 10KV AC to 10KV DC and provide, on demand, different DC voltage levels through a transformer, according to Yang chen, deputy director of the operation and inspection department of State Grid Suzhou Power Supply Company under the direction of State Grid Jiangsu.

The Pangdong station is also the control center for the entire distribution system, Yang said, noting that the power supply can be restored in 100 milliseconds in the event of a grid failure, thereby increasing the reliability rate of the system. ‘99.999% power supply with the latest control system and coordination system.

It is worth mentioning that the project has so far made breakthroughs in the areas of system planning and design, development of key equipment, operation control technology and system protection technology. , with 93 accepted patents, 12 registered software, as well as 6 national and foreign standards compiled. .

According to Yuan Dong, deputy director of the equipment department of State Grid Jiangsu, the demonstration project is expected to explore the construction, operation and maintenance model for the integrated distribution and use of DC power, and provide experience for global energy transformation and changes in energy consumption.

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