A Distribution System State Estimator Based on an Extended Kalman Filter Enhanced with a Prior Evaluation of Power Injections at Unmonitored Buses

David Macii, Daniele Fontanelli and Grazia Barchi
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David Macii: Department of Industrial Engineering, University of Trento, via Sommarive, 9, 38123 Trento, Italy
Daniele Fontanelli: Department of Industrial Engineering, University of Trento, via Sommarive, 9, 38123 Trento, Italy
Grazia Barchi: EURAC Research, Institute for Renewable Energy, via Alessandro Volta, 13/A, 39100 Bozen-Bolzano, Italy

Energies, 2020, vol. 13, issue 22, 1-25

Abstract: In the context of smart grids, Distribution Systems State Estimation (DSSE) is notoriously problematic because of the scarcity of available measurement points and the lack of real-time information on loads. The scarcity of measurement data influences on the effectiveness and applicability of dynamic estimators like the Kalman filters. However, if an Extended Kalman Filter (EKF) resulting from the linearization of the power flow equations is complemented by an ancillary prior least-squares estimation of the weekly active and reactive power injection variations at all buses, significant performance improvements can be achieved. Extensive simulation results obtained assuming to deploy an increasing number of next-generation smart meters and Phasor Measurement Units (PMUs) show that not only the proposed approach is generally more accurate and precise than the classic Weighted Least Squares (WLS) estimator (chosen as a benchmark algorithm), but it is also less sensitive to both the number and the metrological features of the PMUs. Thus, low-uncertainty state estimates can be obtained even though fewer and cheaper measurement devices are used.

Keywords: distribution system state estimation; power system measurement; estimation uncertainty; smart grid measurements; Phasor Measurement Units (PMU) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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