The statistical interval estimation of the mean and the hypothesis testing of population proportions for transformer tap position estimation

Rezaei, Mohammad Hosein; Mortazavi, S. S.; Razaz, Morteza; Ghazizadeh, Mohammad Sadegh

doi:10.1016/j.epsr.2018.08.007

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…The problem (19) can be solved via WLS estimation, where the weight matrix W lk,+ = Σ −1 ϵ lk,+ with:…”

Section: Estimation Methods For a Single Branchmentioning

confidence: 99%

“…In the context of transmission systems, several papers consider the tap changer estimation problem in equivalent single-phase power grids. Among them, it is possible to cite as an example [18], where a power system state estimator that includes tap positions and uses an iterative method for taking into account properly zero-injections is proposed, and [19], where the problem of the tap position identification is addressed. In [8], the state estimation model is designed by including the tap settings (voltage transformer turns ratios or phase-shift transformer angles) as additional state variables by means of a measurement model transformed to a conventional nodal frame formulation, introducing one fictitious bus and one fictitious branch for each transformer.…”

Section: Introductionmentioning

confidence: 99%

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PMU-Based Estimation of Systematic Measurement Errors, Line Parameters, and Tap Changer Ratios in Three-Phase Power Systems

Pegoraro

Sitzia

Solinas

et al. 2022

IEEE Trans. Instrum. Meas.

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The availability of accurate data is fundamental for several monitoring and control applications of modern power grids. Nevertheless, the knowledge of critical data such as transmission line and transformer parameters is often affected by uncertainty. This can lead to important problems in the correct management of the power systems. In spite of a monitoring infrastructure that is being renewed thanks to new generation devices providing synchronized measurements, the actual values of line parameters and tap changer ratios are still affected by uncertainty sources that need to be properly considered. The behaviour of all the elements involved in the measurement chain must be duly modelled. This paper proposes an improved method to carry out the simultaneous estimation of line parameters, tap changer ratios, and systematic measurement errors for a three-phase power system. The proposed method is based on the suitable modelling of the measurement chain and on three-phase constraint equations (voltage drop and current balance) of all the components involved. Its effectiveness is confirmed by tests performed on a IEEE 14 bus test system reproduced as a threephase system under different operative conditions.

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“…The problem (19) can be solved via WLS estimation, where the weight matrix W lk,+ = Σ −1 ϵ lk,+ with:…”

Section: Estimation Methods For a Single Branchmentioning

confidence: 99%