Effect of Unbalance on Positive-Sequence Synchrophasor, Frequency, and ROCOF Estimations

Castello, Paolo; Ferrero, Roberto; Pegoraro, Paolo Attilio; Toscani, Sergio

doi:10.1109/tim.2017.2782013

Cited by 24 publications

(21 citation statements)

References 22 publications

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“…In [44,47] the objective of a new generation of PMUs able to have both fast and accurate responses is sought. In [48] the impact of unbalance, typical of DNs, is considered and analyzed. Such PMUs require new characterization procedures and great challenges must be faced when considering the requirements that calibrators must guarantee [49,50].…”

Section: Synchronized Measurement Systemsmentioning

confidence: 99%

A Multidisciplinary Approach for the Development of Smart Distribution Networks

et al. 2018

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Electric power systems are experiencing relevant changes involving the growing penetration of distributed generation and energy storage systems, the introduction of electric vehicles, the management of responsive loads, the proposals for new energy markets and so on. Such an evolution is pushing a paradigm shift that is one of the most important challenges in power network design: the management must move from traditional planning and manual intervention to full “smartization” of medium and low voltage networks. Peculiarities and criticalities of future power distribution networks originate from the complexity of the system which includes both the physical aspects of electric networks and the cyber aspects, like data elaboration, feature extraction, communication, supervision and control; only fully integrated advanced monitoring systems can foster this transition towards network automation. The design and development of such future networks require distinct kinds of expertise in the industrial and information engineering fields. In this context, this paper provides a comprehensive review of current challenges and multidisciplinary interactions in the development of smart distribution networks. The aim of this paper is to discuss, in an integrated and organized manner, the state of the art while focusing on the need for interaction between different disciplines and highlighting how innovative and future-proof outcomes of both research and practice can only emerge from a coordinated design of all the layers in the smart distribution network architecture.

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Section: Synchronized Measurement Systemsmentioning

confidence: 99%

A Multidisciplinary Approach for the Development of Smart Distribution Networks

et al. 2018

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“…As regards the measurement noise, the worst-case RFE depends on the Equivalent Noise Bandwidth (ENBW) of the adopted window [13]. Similarly, as regards the phase unbalance, the ROCOF estimation accuracy depends on the algorithm capability of identifying and mitigating the equivalent harmonic disturbances [14]. By considering these uncertainty sources as separate and independent contributions, the dynamic estimation techniques are proven to outperform the static counterparts.…”

Section: Rocof Error Analysismentioning

confidence: 99%

PMU-Based ROCOF Measurements: Uncertainty Limits and Metrological Significance in Power System Applications

Frigo

Derviškadić

Zuo

et al. 2019

IEEE Trans. Instrum. Meas.

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In modern power systems, the Rate-of-Change-of-Frequency (ROCOF) may be largely employed in Wide Area Monitoring, Protection and Control (WAMPAC) applications. However, a standard approach towards ROCOF measurements is still missing. In this paper, we investigate the feasibility of Phasor Measurement Units (PMUs) deployment in ROCOF-based applications, with a specific focus on Under-Frequency Load-Shedding (UFLS). For this analysis, we select three state-of-the-art window-based synchrophasor estimation algorithms and compare different signal models, ROCOF estimation techniques and window lengths in datasets inspired by real-world acquisitions. In this sense, we are able to carry out a sensitivity analysis of the behavior of a PMU-based UFLS control scheme. Based on the proposed results, PMUs prove to be accurate ROCOF meters, as long as the harmonic and inter-harmonic distortion within the measurement pass-bandwidth is scarce. In the presence of transient events, the synchrophasor model looses its appropriateness as the signal energy spreads over the entire spectrum and cannot be approximated as a sequence of narrow-band components. Finally, we validate the actual feasibility of PMU-based UFLS in a real-time simulated scenario where we compare two different ROCOF estimation techniques with a frequency-based control scheme and we show their impact on the successful grid restoration.

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“…Several methods [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] were proposed for detecting and locating faults on high voltage capacitor banks. Conventional methods used to detect faults in capacitor banks are mostly based on unbalances in the phase voltage [2][3], neutral voltage [4], phase current [5], and neutral current [6][7]. The influence of superimposed reactance on the voltage and current has also been utilized [8][9].…”

Section: Introductionmentioning

confidence: 99%

Application of Magnitude and Phase Angle to Boundary Area-Based Algorithm for Unbalance Relay Protection Scheme in 115-kV Capacitor Bank

Lertwanitrot

Ngaopitakkul

2021

IEEE Access

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Identification of fault locations in capacitor banks is still under development. Although, faults in capacitor banks can be detected by an unbalance relay, it cannot identify the fault location. To address this issue, this study proposes an algorithm that can categorize protection zones, identify fault phases, and identify the fault locations in a capacitor bank using the phase angle boundary area. The result showed that the proposed algorithm was effective in indicating the fault location. Performance of the proposed algorithm was compared with conventional methods based on the Electricity Generating Authority of Thailand standard and phasor diagrams. It was verified that the proposed algorithm was more effective than the conventional methods. It is useful for the development of the unbalance relay operation.

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Effect of Unbalance on Positive-Sequence Synchrophasor, Frequency, and ROCOF Estimations

Cited by 24 publications

References 22 publications

A Multidisciplinary Approach for the Development of Smart Distribution Networks

A Multidisciplinary Approach for the Development of Smart Distribution Networks

PMU-Based ROCOF Measurements: Uncertainty Limits and Metrological Significance in Power System Applications

Application of Magnitude and Phase Angle to Boundary Area-Based Algorithm for Unbalance Relay Protection Scheme in 115-kV Capacitor Bank

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