A Z-transform model of transformers for the study of electromagnetic transients in power systems

Su, Qi; James, R.E.; Sutanto, Danny

doi:10.1109/59.49082

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…Fig. 7 compares the measured elements of with the corresponding elements calculated by (5). It is seen that the voltage transfer from high voltage to low voltage is at 200 kHz, about ten times higher than the voltage transfer at 50 Hz.…”

Section: A Measurement Objectmentioning

confidence: 90%

“…The high-frequency behavior can be modeled by calculating a lumped electrical network based on geometry and material properties [1]- [4], but requires very detailed information about the transformer. A different approach is to calculate a black box model based on measured quantities at the transformer terminals [5]- [8]. Although a relatively large number of papers have been published on these two methods, few, if any, have demonstrated models which can reliably reproduce measured waveforms.…”

Section: Introductionmentioning

confidence: 99%

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Wide Band Modeling of Power Transformers

Gustavsen

2004

IEEE Trans. Power Delivery

171

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This paper describes the measurement setup and modeling technique used for obtaining a linear wide band frequency-dependent black box model of a two-winding power transformer, for the purpose of calculation of electromagnetic transients in power systems. The measurement setup is based on a network analyzer, shielded cables, and a connection board. The setup is demonstrated to give a consistent data set where the effect of the measurement cables can be eliminated. The accuracy of the data set is increased by using a combination of current measurements and voltage transfer measurements. A rational approximation of the admittance matrix is calculated in the frequency domain in the range of 50 Hz to 1 MHz and subjected to passivity enforcement, giving a stable model which can be included in electromagnetic transients program (EMTP)-type simulation programs. The accuracy is validated both in the frequency domain and in the time domain.

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Section: A Measurement Objectmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Wide Band Modeling of Power Transformers

Gustavsen

2004

IEEE Trans. Power Delivery

171

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“…The second approach uses a black-box approach, where a model is built solely on the input/output data acquired during properly chosen experiments. In [1] the black box-approach uses bilinear transformation to build a discretetime, z-domain model. In [2] a system identification approach is applied in a pole-zero sub-space modeling of distribution transformers intended primarily for the transformer fault-detection.…”

Section: Introductionmentioning

confidence: 99%

“…Once determined, FIR model allows, through the digital filtering operation, a very easy time-domain calculation of the system's response at any transient excitation. Through the digital filtering operation (closely related to the concept of recursive convolution [1]), the model output at any sample number n can be calculated by summation: (1) where L denotes model order, x(n) is time-sampled input signal, and w i are FIR model coefficients.…”

Section: Introductionmentioning

confidence: 99%

Finite-Impulse-Response Modeling of Voltage Instrument Transformers Applicable for Fast Front Transients Simulations

Dadić

Župan²,

Kolar

2022

joe

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This paper presents a method for Finite-Impulse-Response (FIR) modeling of voltage instrument transformers. The method is based on Wiener filtering and measurement of the transformer response in the frequency domain using a low frequency network analyzer. The proposed method allows, through digital filtering operation, an accurate simulation of the transformer response to transient excitation. Furthermore, the proposed approach to the modeling of the system function allows unequal spacing of the frequency samples. The linearity of the transformer is analyzed applying the Fourier analysis and different waveforms of the primary voltage, and methods for the model order selection, based on the generalized information criterion, are discussed and applied. The theoretical analysis is confirmed with measurements in time domain, using the recurrent surge generator.

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“…Transformer modeling based on measurements models the transformer as a terminal equivalent in a wide band spectrum of frequencies [46][47][48]. Methods of this group match the parameters of the assumed model structure with the transformer experimental frequency response.…”

Section: Transformer Modelingmentioning

confidence: 99%

Physical dynamic simulation of shipboard power system components in a distributed computational environment

Abed¹

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Abed, Nagy Youssef, "Physical dynamic simulation of shipboard power system components in a distributed computational environment" (2007 In order to perform system studies in such an environment physical phase variable models of different components of the shipboard power system were developed using operational parameters obtained from finite element (FE) analysis.These models were developed for two types of studies low and high frequency studies. Low frequency studies are used to examine the shipboard power systems v behavior under load switching, and faults. High-frequency studies were used to predict abnormal conditions due to overvoltage, and components harmonic behavior. Different experiments were conducted to validate the developed models. The Simulation and experiment results show excellent agreement.The shipboard power systems components behavior under internal faults was investigated using FE analysis. This developed technique is very curial in the Shipboard power systems faults detection due to the lack of comprehensive fault test databases.A wavelet based methodology for feature extraction of the shipboard power systems current signals was developed for harmonic and fault diagnosis studies.This modeling methodology can be utilized to evaluate and predicate the NPS components future behavior in the design stage which will reduce the development cycles, cut overall cost, prevent failures, and test each subsystem exhaustively before integrating it into the system.

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A Z-transform model of transformers for the study of electromagnetic transients in power systems

Cited by 15 publications

References 8 publications

Wide Band Modeling of Power Transformers

Wide Band Modeling of Power Transformers

Finite-Impulse-Response Modeling of Voltage Instrument Transformers Applicable for Fast Front Transients Simulations

Physical dynamic simulation of shipboard power system components in a distributed computational environment

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