A method for space power system state estimation from real-time measurements is presented. When the online measurement set includes voltage magnitude plus real and reactive power injections at each bus, a single matrix inversion directly yields the state of the power system without iteration. The calculated state is dependent on the error tolerance of the physical measurements. When the voltage magnitude at the buses is unknown, but real and reactive bus power injections are specified or measured, the method is used for an iterative power flow calculation. The updated value of the state vector is used in the matrix inversion of the next iteration. The strong convergence of the load flow method is shown for several standard IEEE test cases.
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