  In this paper, a novel linear formulation for power system state estimation
that simultaneously treats conventional and synchrophasor measurements is
proposed. A linear circuit model for conventional measurements is introduced to
enable a fully linear equivalent circuit representation of the power system.
The estimated system state is then obtained by formulating the optimization
problem to minimize the measurement errors and solving the resulting linear set
of optimality conditions. To evaluate the accuracy of the proposed method,
simulations are performed on several test cases of various sizes and the
results are presented and discussed.
