Harmonic impedance measurement using three-phase transients

Nagpal, M.; Xu, Wilsun; Sawada, Jun

doi:10.1109/61.660889

Cited by 85 publications

(28 citation statements)

References 3 publications

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“…In reference [3][4][5], a capacitor bank is switched on to cause an instantaneous short circuit that result with a current signal in a wide frequency range. In reference [6] a transformer is switched on.…”

Section: Harmonic Impedance Measurement Methodsmentioning

confidence: 99%

Expert System Design for Determining the Harmonic Resonance and the Capacitor Safety Level

Gül¹,

Othan²

2024

RE&PQJ

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Abstract-This paper presents a computer based expert system aiming the determination of harmonic resonance and the capacitor safety level. Developed applications for the determination of harmonic resonance are basically depending on the selection of a right harmonic impedance measurement method and the changes observed in the equivalent system impedance due to the occurrence of harmonic resonance. However, developed applications for the determination of capacitor safety level are depending on the international standards which introduce the related indices and limits for the capacitors and the fuzzy logic method. All developed applications were programmed using LabVIEWTM and the data required, is obtained continuously from real-time measurements.

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Section: Harmonic Impedance Measurement Methodsmentioning

confidence: 99%

Expert System Design for Determining the Harmonic Resonance and the Capacitor Safety Level

Gül¹,

Othan²

2024

RE&PQJ

View full text Add to dashboard Cite

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“…The commonly applied methods relying on frequency scanning [4], generally require assumptions to be made about the signal such as the signal being stationary and periodic, where the sampling frequency is equal to the number of samples multiplied by the fundamental frequency, the Nyquist sampling theorem holds and each frequency is an integer multiple of the fundamental frequency which will be the inverse of the window length [5].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous frequency tracking of harmonic distortions for grid impedance identification based on Kalman filtering

Broen

Ամին

Skjong

et al. 2016

2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Abstract-This paper presents a non-invasive approach for real-time grid impedance identification based on the principle of instantaneous frequency tracking of voltage and current harmonics already present in the system, by the use of Kalman Filter (KF). The KF based technique is compared to the FFT frequency domain approach highlighting the advantages and disadvantages of each method. The main limitation of the KFbased identification lies in its intrinsic model based nature, which in this case will limit its scope to the system steady state and to stationary signals. The KF based approach presented in this paper, can be useful as a basis for real-time grid stability assessment based on the impedance identification. I. INTRODUCTIONKnowledge of the source and load impedances in an electrical grid is essential to estimate the stability of the grid using the impedance-based method with the generalized Nyquist stability criterion, first described in [1], with an application for AC systems in [2]. The impedance-based method requires, however, the injection of small signals in a wide range of frequencies to obtain a good estimate of the stability of the grid. This frequency scanning technique does not allow for a real-time estimation of the impedances and stability. The real-time identification of the impedances of the grid can be relevant considering the non-stationary environment where the impedance may vary with the operating conditions and with parameter variations over time [3]. This paper is proposing a non-invasive method to identify the impedances of the grid based on the use of the information of the distortions already present in the current and voltage waveforms, without resorting to any small-signal injection.Modern electrical systems are including more and more non-linear loads that are a frequent source of harmonic distortions. Electrical grids that are already affected by distorted voltages and currents can readily benefit from a non-invasive approach of impedance identification that makes use of the information provided by such distortions and can lead to a straightforward grid stability assessment in time-domain. The tracking, at a given node, of each of the harmonic components present in the voltage and current, can enable the identification of the grid impedances in a non-invasive way, by simply calculating the ratio V (ω)/I(ω) = Z(ω) at each harmonic distortion.

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“…Active Impedance Estimation (AIE), derived from harmonic impedance measurement [6][7][8][9][10][11], is one possibility for providing information on the location and severity of faults for independent circuit breaker operation in the event of a major systems failure, due to e.g. battle damage, which may occur on a frontline warship [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

A DC distribution demonstrator incorporating Active Impedance Estimation for marine applications

Christopher

Wang

Sumner

et al. 2010

Electrical Systems for Aircraft, Railway and Ship Propulsion

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A small scale laboratory demonstrator has been constructed to represent a zonal DC distribution system as proposed for future naval vessels. This paper describes how the demonstrator has been used to validate a proposed fault location strategy -Active Impedance Estimation (AIE) -under experimental conditions. The practical processing algorithms required to reduce the effect of noise and the background supply harmonics are presented. The experimental results validate the AIE approach and confirm its robustness and accuracy.

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Harmonic impedance measurement using three-phase transients

Cited by 85 publications

References 3 publications

Expert System Design for Determining the Harmonic Resonance and the Capacitor Safety Level

Expert System Design for Determining the Harmonic Resonance and the Capacitor Safety Level

Instantaneous frequency tracking of harmonic distortions for grid impedance identification based on Kalman filtering

A DC distribution demonstrator incorporating Active Impedance Estimation for marine applications

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