On-line measurement of equivalent parameters of distribution system and its load for harmonic frequencies

Staroszczyk, Z.

doi:10.1109/imtc.1995.515406

Cited by 19 publications

(17 citation statements)

References 3 publications

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“…From the model shown in Figure , the following relationship can be derived for a given frequency f between utility side parameters, that is, complex background harmonic voltage E and HI Z on one hand, and PCC complex harmonic voltage V and current I on the other :

V = E - I Z .

…”

Section: Problem Formulationmentioning

confidence: 99%

A new method for noninvasive measurement of grid harmonic impedance with data selection

Borkowski

2015

Int. Trans. Electr. Energ. Syst.

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Summary The paper presents a new, noninvasive method for the measurement of power grid harmonic impedance. The method is a robust variant of transfer function estimation method. Its novelty lays in the way of selecting local harmonic impedance estimates for averaging, based on input–output coherence estimates, which immunizes it against background voltage variations. The method is validated by simulation including varying background voltage harmonics, both for fixed and slowly varying harmonic impedance. It has also been tested with noisy and nonsynchronously sampled signals. The method is compared with another noninvasive method with data selection. Simulation results clearly show that the proposed method returns lower estimation errors. Also, its computational complexity is significantly reduced compared with the reference one. The presented results of a field test conducted at medium‐voltage/low‐voltage substation prove that the method works well in real conditions. Copyright © 2015 John Wiley & Sons, Ltd.

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V = E - I Z .

…”

Section: Problem Formulationmentioning

confidence: 99%

A new method for noninvasive measurement of grid harmonic impedance with data selection

Borkowski

2015

Int. Trans. Electr. Energ. Syst.

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“…They have, however, more disadvantages: they are passive, so identification can be done only on systemexisting harmonics, and it is of a poor quality [7]. The large capacitor banks should be precharged and switched on the top of line voltage, and switched off with the zero current -such switching needs additional hardware.…”

Section: Problemsmentioning

confidence: 99%

New invasive method for localisation of harmonic distortion sources in power systems

Staroszczyk¹,

Mikołajuk²

1998

Int Trans Elec Energy Syst

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The presentedpaper illustrates the invasive method of power-system identification. It is based on Czarnecki's ideas to disturb slightly the system and observe its response to find unknown harmonic sources and equivalent linear impedances. The one-phase system is considered, with a new signal-processing technique in which instant measurements are based only on two adjacent signal periods. That approach allowed to move differential calculations to the time domain, and to deal with integral Fourier transform, in place of discrete, in frequency domain. The new algorithm allows to increase the S/N ratio, is insensitive to signal time-shifts and gives correct results in a wide frequency band (5 kHz). Simulation and rneasurements results are presented and show how accurate the identification can be f o r short-time (two periods) and 1 s long observations.

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“…The "black box" power system description is necessary if there is a lack or limited knowledge on the power grid structure and its loads. In such situations the impedance identification / measurement experiment is a principal source of the information on the grid [1], [2], [5]. Impedance and voltage observations in the PCC deliver the linear model of the grid which has plenty of useful implementations [5], [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Impedance in voltage-current relations description of the power system PCC - experimental investigations of the accuracy of the LTI system model

Staroszczyk

2009

2009 10th International Conference on Electrical Power Quality and Utilisation

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The paper presents experimental verification of the quality of LTI power grid model valid for the frequency range of 8 kHz. The single PCC was investigated so the paper is the local, University grid investigations oriented, however concerns two general important problems: one is the absolute accuracy of real grid impedance measurements to which no direct reference data are accessible, the second is the validity of the LTI model, which is used for description of the complex structure composed of nonlinear and switched power installations. The LTI models form very interesting and useful approximation of the complex reality and have meaningful time and frequency domain interpretation. When used for power grids they deal with their Norton/Thevenin equivalent models. Two components of such a model: impedance and system side sources describe the grid and are discussed in the paper. Rich experimental data were referenced to the structural model of the grid so the paper gives evaluative information on the quality of ad-choc grid modeling. Interesting, incremental method for the estimation of absolute impedance errors was proposed and used for improvement of the implemented DSP. Time varying nature of the investigated grid impedance was presented, and system errors with implementation of LTI model to such a time-varying PCC description are discussed.

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On-line measurement of equivalent parameters of distribution system and its load for harmonic frequencies

Cited by 19 publications

References 3 publications

A new method for noninvasive measurement of grid harmonic impedance with data selection

A new method for noninvasive measurement of grid harmonic impedance with data selection

New invasive method for localisation of harmonic distortion sources in power systems

Impedance in voltage-current relations description of the power system PCC - experimental investigations of the accuracy of the LTI system model

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