Date Added: Nov 2012
Recent advances in metering technology deregulation of the energy market, rapid penetration of renewables, and the smart grid vision for situational awareness, all call for a system-wide Power System State Estimation (PSSE). On the other hand, complexity of an interconnected power grid, privacy policies of local authorities, and vulnerability concerns preclude a centralized estimator. In this paper, several possible manifestations of PSSE are treated in the present paper under a unified and systematic framework. Building on the alternating direction method of multipliers, a novel decentralized PSSE approach is developed. The obtained algorithm waives local observability concerns, leverages existing software, while requiring local system operators exchange minimal information only across tie lines.