  This paper is about computationally tractable methods for power system
parameter estimation and Optimal Experiment Design (OED). Here, the main
motivation is that OED has the potential to significantly increase the accuracy
of power system parameter estimates, for example, if only a few batches of data
are available. The problem is, however, that solving the exact OED problem for
larger power grids turns out to be computationally expensive and, in many
cases, even computationally intractable. Therefore, the present paper proposes
three numerical approximation techniques, which increase the computational
tractability of OED for power systems. These approximation techniques are
bench-marked on a 5-bus and a 14-bus case studies.
