Distributed robust power system state estimation

Vassilis Kekatos, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

284 Scopus citations

Abstract

Deregulation of energy markets, penetration of renewables, advanced metering capabilities, and the urge for situational awareness, all call for system-wide power system state estimation (PSSE). Implementing a centralized estimator though is practically infeasible due to the complexity scale of an interconnection, the communication bottleneck in real-time monitoring, regional disclosure policies, and reliability issues. In this context, distributed PSSE methods are treated here under a unified and systematic framework. A novel algorithm is developed based on the alternating direction method of multipliers. It leverages existing PSSE solvers, respects privacy policies, exhibits low communication load, and its convergence to the centralized estimates is guaranteed even in the absence of local observability. Beyond the conventional least-squares based PSSE, the decentralized framework accommodates a robust state estimator. By exploiting interesting links to the compressive sampling advances, the latter jointly estimates the state and identifies corrupted measurements. The novel algorithms are numerically evaluated using the IEEE 14-, 118-bus, and a 4200-bus benchmarks. Simulations demonstrate that the attainable accuracy can be reached within a few inter-area exchanges, while largest residual tests are outperformed.

Original languageEnglish (US)
Pages (from-to)1617-1626
Number of pages10
JournalIEEE Transactions on Power Systems
Volume28
Issue number2
DOIs
StatePublished - 2013

Keywords

  • Alternating direction method of multipliers
  • Bad data identification
  • Huber's function
  • Multi-area state estimation
  • Phasor measurement units
  • SCADA measurements

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