On the prediction of ferroresonance in distribution networks

Mitrea, S.; Adăscăliţei, Adrian

doi:10.1016/0378-7796(92)90063-7

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…A first solution of the Equations (16) and 17is  1/3 = between the Equations (16) and (17). We obtain a relation in  of type:…”

Section: Search For Integer Subharmonics Modesmentioning

confidence: 98%

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Analytical Approach for the Systematic Research of the Periodic Ferroresonant Solutions in the Power Networks

Amar¹,

Dhifaoui²

2011

EPE

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Ferroresonance is a complex and little known electrotechnical phenomenon. This lack of knowledge means that it is voluntarily considered responsible for a number of unexplained destructions or malfunctioning of equipment. The mathematical framework most suited to the general study of this phenomenon is the bifurcation theory, the main tool of which is the continuation method. Nevertheless, the use of a continuation process is not devoid of difficulties. In fact, to continue the solutions isolats which are closed curves, it is necessary to know a solution belonging to this isolated curve (isolat) to initialise the continuation method. The principal contribution of this article is to develop an analytical method allowing systematic calculation of this initial solution for various periodic ferroresonant modes (fundamental, harmonic and subharmonic) appearing on nonlinear electric system. The approach proposed uses a problem formulation in the frequency domain. This method enables to directly determine the solution in steady state without computing of the transient state. When we apply this method to the single-phase ferroresonant circuits (series and parallels configurations), we could easily calculate an initial solution for each ferroresonant mode that can be established. Knowing this first solution, we show how to use this analytical approach in a continuation technique to find the other solutions. The totality of the obtained solutions is represented in a plane where the abscissa is the amplitude of the supply voltage and the ordinate the amplitude of the system’s state variable (flux or voltage). The curve thus obtained is called “bifurcation diagram”. We will be able to then obtain a synthetic knowledge of the possible behaviors of the two circuits and particularly the limits of the dangerous zones of the various periodic ferroresonant modes that may appear. General results related to the series ferroresonance and parallel ferroresonance, obtained numerically starting from the theoretical and real cases, are illustrated and discussed

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“…A first solution of the Equations (16) and 17is  1/3 = between the Equations (16) and (17). We obtain a relation in  of type:…”

Section: Search For Integer Subharmonics Modesmentioning

confidence: 98%

“…In contrast, the maximum voltage of existence (where the second bifurcation BP 2 ) decreases. Indeed, in order that this mode persists, it is necessary that the source energy can compensate for the network losses [16,17]. This remains possible for strong voltages.…”

Section: Search For Integer Subharmonics Modesmentioning

confidence: 99%

Analytical Approach for the Systematic Research of the Periodic Ferroresonant Solutions in the Power Networks

Amar¹,

Dhifaoui²

2011

EPE

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“…Before establishing a simulation model, we needed to determine the saturation parameters of the transformer. The saturation characteristic of the excitation coil of the voltage transformer is nonlinear, so it is necessary to measure its actual excitation parameters [23,26]. In this paper, the saturation characteristic parameters of PT are obtained by using the curvilinear coordinate method: set different voltages at the primary side for testing, and convert the measured secondary side voltage and current data to the primary one side, calculate the magnetic flux by using U dφ dt = / (B can be obtained under the excitation of sinusoidal voltage at a single frequency), calculate the magnetic flux φ.…”

Section: Modeling Ferroresonancementioning

confidence: 99%

A MATLAB GUI teaching application for ferroresonance simulation

Tao

Gan

Fang

et al. 2021

Comp Applic In Engineering

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Ferroresonance is a complex phenomenon and can compromise power system sustainability in transformer cores during the electromagnetic saturation process. Over-voltage can be induced in the inductive core of transformers in an oscillation imbalance circuit; thus causing short circuits or permanent damage to a transformer. Hence, this paper developed a teaching application that combined a graphical user interface (GUI) in MATLAB with a SIMULINK function to model a ferroresonance circuit, to undergraduate engineering students at a Chinese University, as a part of a high-voltage engineering course. Students can adjust the parameters in the model to test different types of resonance voltage waveforms to obtain the corresponding power frequencies directly in the GUI. Through the interactive GUI environment, the difficulties that undergraduate students experience in distance education can be eliminated. A questionnaire of the 63 students who took the course was administered to measure student perceptions of this project-based learning experience, and the responses are included in this paper.

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“…On the grid side, limiting the line capacitance [ 15 ] contributes to preventing the occurrence of ferroresonances, and, after their appearance, isolating the area with ferroresonance and changing the grid topology within this area (e.g., disconnecting long lines and distributed generation systems) facilitate the mitigation of the event [ 16 ]. In the case of occurrence within wind farms [ 17 ], STATCOMs can be used to mitigate them and protect the wind turbines [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

Martínez

Arroyo

Pigazo

et al. 2022

Sensors

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Power-quality events and operation transients in power systems (PS) with isolated neutral can saturate inductive voltage transformers (IVT), which, when interacting with the overhead and underground cable capacitances, can cause ferroresonance events in the local PS. This abnormal operating mode can partially or totally damage the transformers and switchgears within the affected PS. Distribution system operators (DSO) can minimize these effects by detecting ferroresonance events accurately and fast enough and changing the mode of operation accordingly. Direct detection methods, i.e., based on voltage measurements, are reliable, but the massive deployment of this solution is relatively expensive; i.e., power quality analyzers cost thousands of USD. Alternatively, indirect detection methods are also available, e.g., IVT vibration measurements with accelerometers costing hundreds of USD, but their reliability depends on the installation method used. This manuscript proposes using the acoustic noise caused by magnetostriction forces within the IVT core during ferroresonance events to detect their occurrence. Compared to other indirect methods, electret condenser microphones with preamplifying stage cost less than USD 10 and are less sensitive to the installation procedure. The proposed method is validated experimentally, and its performance compared to IVT vibration measurements one by using the same detection methodology.

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On the prediction of ferroresonance in distribution networks

Cited by 5 publications

References 5 publications

Analytical Approach for the Systematic Research of the Periodic Ferroresonant Solutions in the Power Networks

Analytical Approach for the Systematic Research of the Periodic Ferroresonant Solutions in the Power Networks

A MATLAB GUI teaching application for ferroresonance simulation

Acoustic Noise-Based Detection of Ferroresonance Events in Isolated Neutral Power Systems with Inductive Voltage Transformers

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