Secure system state estimation is an important issue
in smart grid to assure the reliability and security. In this paper,
the case of a single observation station and Gaussian noise
communication channel with an eavesdropper is considered. The
channel capacity requirement is studied from the information theoretic
perspective. The smart grid is modeled as a linear dynamic
system. Then, the channel capacity requirement is studied for
the state estimation of general linear dynamic systems and then
applied in the system state estimation in smart grid. Numerical
simulations are used to evaluate the capacity requirement in
typical configurations of smart grid.
