Framework and Implementation of Linkage Control for Unmanned Smart Substation Security Improvement

Linkage control of Substation Auxiliary Control System (SACS) improves unmanned smart substation (USS) security by self-restoring of Intelligent Electronic Devices (IEDs). However IEC61850 standard doesn’t define the protocol for linkage control. This paper proposes a framework of linkage control on the priority-based method, which resolves interoperability between different IEDs. Then, the structure of remote integrated application server (RIAS) is expended to implement the proposed linkage control scheme in SACS. In the end, four SACS scenarios with linkage control were tested. The results show that priority-based linkage control has better performance in security and reliability of SACS by comparison with time-based linkage control.