Abstract
Abstract State estimation plays a vital role in the monitoring and control of modern power systems. A set of power system measurements is said to be observable with respect to its power system if knowledge of the set allows determination of all the complex bus voltages in the system. In [1] Krumpholz, Clements and Davis established the necessary conditions for observability of a measurement set with respect to its power system. Based on these conditions they developed an algorithm that tests the observability of a given or fixed measurement set. This paper addresses the case in which the measurement set is not fixed and may vary between successive estimates. An algorithm that processes measurements sequentially and forms an observable measurement set from the available measurements, is introduced.
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