Complete characterization of utilization-voltage power system impedance using wideband measurement

Rhode, J.P.; Kelley, A.W.; Baran, Mesut

doi:10.1109/icps.1996.533946

Cited by 44 publications

(19 citation statements)

References 12 publications

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“…Another possibility to determine grid impedance can be reached by injecting a signal at non characteristic frequencies [7], [8], [18]. Therefore a multi frequent current source (synchronous generator, converter or equivalent) injects a current into the grid.…”

Section: Methods Of Grid Impedance Measurement -State Of the Artmentioning

confidence: 99%

High frequency grid impedance analysis by current injection

Knop

Fuchs

2009

2009 35th Annual Conference of IEEE Industrial Electronics

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The impedance of the electrical grid is frequency and time depending. Therefore it is very useful to know its value in the frequency range between grid fundamental frequency and frequencies in the kHz-range. The proposed grid impedance analysis contributes to optimize energy feed especially from decentralized converter equipped renewable sources. This paper presents an advanced impedance measurement system with a high frequency range for the energized electrical low voltage grid. A sinusoidal current of predetermined frequency is injected into the grid. The grid impedance at that frequency is calculated from the measured magnitude and phase of the injected current and resulting voltage. The measurements are executed at nearby frequencies to produce nearly continuous impedance versus frequency characteristic. The basic concept and a prototype of test equipment are presented.

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Section: Methods Of Grid Impedance Measurement -State Of the Artmentioning

confidence: 99%

High frequency grid impedance analysis by current injection

Knop

Fuchs

2009

2009 35th Annual Conference of IEEE Industrial Electronics

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“…A controlled voltage disturbance is also reported for the impedance measurement in [9]. A complete characterization of the utility network is possible [10], [11], however, in most of the cases in DPGS, measurement of the utility impedance at certain frequencies are very useful [12]- [15]. Application of the impedance measurement in the protection of gridconnected distributed resources has been shown in [16]- [17].…”

Section: Introductionmentioning

confidence: 92%

Frequency domain identification of the utility grid parameters for distributed power generation systems

Moallem

Yazdani

Bakhshai

et al. 2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper presents an online estimation scheme for the identification of distribution power system impedance parameters. The proposed scheme is based on an invasive current injection method. The scheme benefits from a fast and accurate adoptive notch filter for the extraction of the ambient voltages and currents and also a frequency domain least squares estimator. The former enhances the scheme by providing accurate information even under corrupted grid signals, while the latter purifies the estimations from the measurements noise. Simulation and experimental results verify the accuracy of the proposed scheme and its ability to perfectly track the impedance variations of the distribution network.

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“…Active methods inject the non fundamental frequency signals using either existing power system equipment [13], [14] or special signal injection equipment [15].…”

Section: Grid Impedance Measurementmentioning

confidence: 99%

High frequency grid impedance analysis with three-phase converter and FPGA based tolerance band controller

Knop

Fuchs

2009

2009 Compatability and Power Electronics

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The electrical grid features show a frequency dependent impedance. To know their value in the frequency range between grid fundamental frequency and up to frequency's in the kHz-range is very useful. It contributes to optimize energy feed in as well as from decentralized converter equipped renewable sources.This paper presents an advanced frequency dependent impedance measurement system for the energized grid with a high frequency range. For these grid impedance measurements a fast switching three-phase high frequency converter with a fast and robust control is required. Control is carried out by a FPGA based tolerance band or hysteresis control. The power circuit for high frequency (up to 10 kHz) measuring current is presented and measurements are shown and analyzed.

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Complete characterization of utilization-voltage power system impedance using wideband measurement

Cited by 44 publications

References 12 publications

High frequency grid impedance analysis by current injection

High frequency grid impedance analysis by current injection

Frequency domain identification of the utility grid parameters for distributed power generation systems

High frequency grid impedance analysis with three-phase converter and FPGA based tolerance band controller

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