An integrated low-voltage rated HTS DC power system with multifunctions to suit smart grids

• A novel LVDC HTS power transmission network is presented.
• An integrated power system is achieved by using HTS DC cable and SMES.
• DC superconducting cable is verified to achieve self-acting fault current limitation.
• SMES is verified to achieve fast-response buffering effect under a power fluctuation.
• SMES is verified to achieve favorable load voltage protection effect under a fault.

A low-voltage rated DC power transmission network integrated with superconducting cables (SCs) and superconducting magnetic energy storage (SMES) devices has been studied with analytic results presented. In addition to the properties of loss-less and high current transportation capacity, the effectively integrated system is formed with a self-acting fault current limitation feature of the SC and a buffering effect of the SMES to power fluctuations. The results obtained show that the integrated system can achieve high-quality power transmission under common power fluctuation conditions with an advanced self-protection feature under short circuit conditions, which is identified to suit especially the smart grid applications.