In this paper steady-state stability analysis algorithms,
based on operations with systems of equations of subsystems on
lower level and coordinating operations on upper level of control
system. This approach to steady-state stability analysis makes
solution of these problems in large power systems much easier
compared with solution of, based on analysis of matrix of system
of equations for power system as a whole. Most efficient realization
of these algorithms can be achieved on distributed control
system, which includes computers of lower layer, installed in
control centers of subsystems and computer of upper layer –
server.