Accurate voltage phasor measurement in a series-compensated network

Lambert, José; Phadke, A.G.; McNabb, D.

doi:10.1109/61.277722

Cited by 33 publications

(7 citation statements)

References 4 publications

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“…For example, we verified that the following notch filters effectively smooth out the torsional modes from the signal, with less phase lag in the useful band than : This example shows that there will be no easy way for a single filtering solution addressing all wide-area control applications. The filter requirements are so specific to the actual situation that the best approach may possibly be to provide a flexible framework as presented in this paper which will allow the vendor and the utility to jointly fine-tune the PMU filtering performance within the specifics of the plan, the grid and the target application (e.g., see [8]). …”

Section: B Actual Recording At a Nuclear Power Stationmentioning

confidence: 99%

“…The one cycle box-car window-based DFT is naturally centered at the nominal fundamental frequency and allocates perfect notches at the harmonic frequencies in positive and negative sequence. However, due to a non flat-top magnitude response and relatively high sidelobes, the DFT-extracted phasor suffers from two well-documented fundamental problems [8]:…”

Section: Dynamic Phasor Embedded In Changing Harmonicsmentioning

confidence: 99%

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Adaptive Phasor and Frequency-Tracking Schemes for Wide-Area Protection and Control

Kamwa

Pradhan

Joós

2011

IEEE Trans. Power Delivery

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The steady-state performance of phasor measurement units (PMUs) is well standardized in the recently issued revised IEEE Std. C37.118. The Western Electricity Coordinating Council (WECC) has developed dynamic performance requirements for PMU filters as a means to guarantee better, uniform PMU response under dynamic conditions, such as power swings and changing harmonics. These have been endorsed by North American Synchrophasor Initiative (NASPI) for its wide-area monitoring infrastructure. The main purpose of this paper is to present a new framework for designing PMU filtering algorithms capable of meeting or exceeding the WECC/NASPI requirements, while achieving an optimum transient response time. To this end, an adaptive complex bandpass filter derived from the exponentially modulated filter bank theory has been devised. It is built from freely chosen low-pass filter prototypes that fulfill the WECC requirements. The static and dynamic performances of two specific schemes dedicated to control and monitoring with 4-and 7-cycle response-time, respectively, are ascertained under noisy waveforms and changing harmonics with system frequency varying from 40 to 80 Hz. The center-frequency adaptation approach is shown to be intrinsically superior to the frequency compensation scheme, especially under fast varying frequency and changing harmonics.Index Terms-Adaptive complex bandpass filtering, changing harmonics, frequency estimation, phasor measurement unit (PMU), power system oscillations, synchrophasor, wide-area measurement systems (WAMS), wide-area protection and control (WAPC).

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Section: B Actual Recording At a Nuclear Power Stationmentioning

confidence: 99%

Section: Dynamic Phasor Embedded In Changing Harmonicsmentioning

confidence: 99%

Adaptive Phasor and Frequency-Tracking Schemes for Wide-Area Protection and Control

Kamwa

Pradhan

Joós

2011

IEEE Trans. Power Delivery

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“…For improving the accuracy and decreasing the time-response, many digital algorithms have been proposed in the past [1]- [3]. Also, different strategies have been presented to improve the algorithm accuracy by removing the decaying DC component from the data or by broadening the data-window [4]. The accuracy mainly depends on correct estimation of the fundamental frequency components and the suppression of other frequency components, while the timeresponse depends on the length of the data-window.…”

mentioning

confidence: 99%

“…The full cycle DFT filter exhibits better frequency responses than the half cycle DFT filter, because the former eliminates all harmonics, whereas the latter does not eliminate even harmonics. Many efforts have been directed to propose modifications to the DFTbased algorithms [2], [4], [9]. The key idea of these propositions is to perform the phasor correction based on the error in the DFT output caused by the decaying DC component.…”

mentioning

confidence: 99%

An effective method for impedance estimation in distance relay based on DC offset removal

Vázquez

Ramı́rez

Zamora

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

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This paper proposes to combine the multipurpose digital filter (MDF) and the discrete Fourier transform (DFT) for the transmission lines impedance estimation under fault conditions. The digital filtering requirements in protecting relays are critical, because it is relevant to attain precise, fast, and reliable line impedance estimation from faulted current and voltage signals. In this paper, the proposed filter removes the exponentially decaying DC offset from the current signal, enhancing the impedance estimation under transient conditions, and reducing the time of estimation. Comparisons are made respect to the DFT with a one-cycle rectangular window. Simulations are carried out in order to assess the proposal.Index Terms--Digital filtering, exponential decaying, impedance estimation, phasor estimation, filtering, protective functions.I.

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“…The other one presents the solution for the misalignment between samples but depends totally on the zero crossing. Other approaches have been used as a solution for the misalignment between samples problem [9,10,11]. However, in some specific conditions these approaches can cause a fault detection failure [12].…”

Section: Introductionmentioning

confidence: 99%

A current differential line protection using a synchronous reference frame approach

Pires

Guerreiro²

2008

IET 9th International Conference on Developments in Power Systems Protection (DPSP 2008)

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This paper presents a new approach for a current differential protection of the transmission lines. This approach is based on the Park transformation or ABC-dqo transformation. Using the ABC-dqo transformation the three phase quantities are transformed into a synchronous rotating reference frame. In this way, the line currents of the three phase system are measured and transformed into three dc components. So, immunity to problems such as sampling misalignment and time delay of the communication channel will be improved. Several test results are presented in order to show the effectiveness of the proposed approach.

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Accurate voltage phasor measurement in a series-compensated network

Cited by 33 publications

References 4 publications

Adaptive Phasor and Frequency-Tracking Schemes for Wide-Area Protection and Control

Adaptive Phasor and Frequency-Tracking Schemes for Wide-Area Protection and Control

An effective method for impedance estimation in distance relay based on DC offset removal

A current differential line protection using a synchronous reference frame approach

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