A multi-terminal alternating current/direct current hybrid power distribution network was placed online by China Southern Power Grid (CSG) on Dec 25 in Tangjiawan and one is also planned for Hengqin.

The breakthrough in Zhuhai reportedly is the largest of its kind in the world. It supports the first batch of the Internet+ Intelligent Energy Demonstration Program approved by the National Energy Administration. And it allows "friendly" access to renewable energy to improve grid efficiency and power quality.

The Tangjiawan project commenced in 2017 and consists of three flexible DC converter stations connected via underground cables, plus a DC micro grid system.

An engineer compares the project to a large pool with multiple terminals working like water pipes that either pour in or pump out electric power. The network deals with grades of ±10 kV, ±375V, and ±110V, so that first-in-class technological adjustment of electricity currents and voltages on each node works smoothly.

Operation base [Photo provided by Zhuhai Power Supply Bureau]

Information is to be collected from 10,000 users regarding electricity used for light, storage, charging, and temperature, plus gas and water consumption. The overall plan calls for full coverage of smart meters and low-voltage collections.