Design and Operation of Hangzhou Jiangdong flexible DC distribution network

The Jiangdong flexible DC distribution network is the demonstration project of the State Grid Zhejiang Electric Power Company for the exploration of DC distribution technology. The project adopts integrated, pre-installed and modular design, factory commissioning and outdoor container installation. It consists of three AC terminals connected to three distribution areas where AC voltages are 10 kV, 10 kV and 20 kV respectively, and the DC voltage is ±10 kV. No transformers are used for three modular multilevel converters. This paper presents overview of Jiangdong flexible DC distribution network and some parts of specific considerations for the system.