The problem of logical node (LN) importance quantification in an IEC 61850 based substation automation system (SAS) is investigated in this paper. First

a weighted and directed static complex network model is established by analyzing the characteristics of SAS

according to IEC 61850. Then

we propose a method

which combines topology value and information adjunction value by introducing a first-order linear feedback controller to quantify the value of LNs. On this basis

some definitions for equivalent network conversion are proposed to greatly reduce the complexity of the original network topology. Also

the absolute value and relative value are introduced to quantify LN importance from the perspective of the node's necessity and influence

respectively. Finally

simulation results of the case study demonstrate that the proposed method is effective and provides a broader and clearer perspective for viewing the logical node importance for IEC61850 based SAS.