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access icon free Recent advances on state estimation for power grids with unconventional measurements

© The Institution of Engineering and Technology
Received 30/06/2017, Accepted 26/09/2017, Revised 06/09/2017, Published 27/09/2017

State estimation problem for power systems has long been a fundamental issue that demands a variety of methodologies depending on the system settings. With the recent introduction of advanced devices of phasor measurement units (PMUs) and dedicated communication networks, the infrastructure of power grids has been greatly improved. Coupled with the infrastructure improvements are three emerging issues for the state estimation problems, namely, the coexistence of both traditional and PMU measurements, the incomplete information resulting from delayed, asynchronous and missing measurements due to communication constraints, and the cyber-attacks on the communication channels. In this study, the authors aim to survey some recent advances on the state estimation methods which tackle the above three issues in power grids. Traditional state estimation methods applied in power grids are first introduced. Latest results on state estimation with mixed measurements and incomplete measurements are then discussed in great detail. In addition, the techniques developed to ensure the cyber-security of the state estimation schemes for power grids are highlighted. Finally, some concluding remarks are given and some possible future research directions are pointed out.

Inspec keywords: computer network security; power engineering computing; power system state estimation; phasor measurement; power system security; power grids

Other keywords: dedicated communication network; infrastructure improvement; phasor measurement unit; communication constraints; mixed measurements; state estimation scheme cybersecurity; incomplete measurements; cyber-attacks; communication channels; power system; PMU measurement; unconventional measurement; power grid; missing measurements

Subjects: Computer communications; Power system measurement and metering; Power system control; Data security; Computer networks and techniques; Power engineering computing

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