Robust state estimation via network partitioning

This paper presents a linear phasor state estimator which maintains robustness against gross errors while remaining computationally efficient. This is achieved by defining as many additional zones as necessary so that any bus in the system will appear as an internal bus with respect to at least one zone. All zones will have their separate state estimators which will run in parallel assuming the availability of a multi-core parallel computing platform. Thus, the overall computation time will be independent of the actual system size, but will be determined by the size of the largest zone. Such an estimator is emulated and tested on a small (30-bus) and a large (2917-bus) test power system.