Voltage sag source location technology based on corresponding sequence components

Zhu, Ke; Wang, Yixuan; Yin, Peng; Ni, Jian

doi:10.1049/iet-gtd.2014.0772

Cited by 21 publications

(13 citation statements)

References 19 publications

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“…Zhu et al introduce a concept of sequence component, generalizing this method to the voltage sag location of neutral ineffectively grounded network. Leborgne and Karlsson and Pradhan et al propose a method to locate the voltage sag source by using only single voltage variable sampling, but only under certain conditions can it be used.…”

Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

“…Two steps are needed to calculate the real part of equivalent impedance. First, n sets of voltage and current are sampled before and during the disturbance, and then Fourier analysis is performed to extract fundamental positive-sequence voltage and current Zhu et al 13 introduce a concept of sequence component, generalizing this method to the voltage sag location of neutral ineffectively grounded network. Leborgne and Karlsson and Pradhan et al 14,15 propose a method to locate the voltage sag source by using only single voltage variable sampling, but only under certain conditions can it be used.…”

Section: Distance Impedance Relay Methods 11 (Dr)mentioning

confidence: 99%

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Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Tang

Wei

Chen

et al. 2017

Int Trans Electr Energ Syst

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Summary This paper briefly introduces the existing methods for voltage sag source location and theoretically analyzes some reasons why high accuracy cannot be achieved by using these methods. Based on the redefined voltage sag source location “reference direction” and the analysis of voltage sag source's influences in power network, it is pointed out that observing from disturbance source point to both sides of monitoring services, any power network can be equivalent to 2 active single‐port networks and the networks can be equally replaced by “Thevenin's equivalent circuit.” By judging the sign of the internal resistance in Thevenin' s equivalent circuit, the origin of voltage sag disturbance can be easily identified. The calculation of internal transient resistance is given based on the application of space vector theory. This method can locate voltage sag source with an accuracy of 100% verified by simulation experiments. It is a very practical method that is not only applicable in radial and nonradial power systems but also in networks of neutral grounded effectively or ineffectively.

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Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

Section: Distance Impedance Relay Methods 11 (Dr)mentioning

confidence: 99%

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Tang

Wei

Chen

et al. 2017

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…However, few researches are implemented on unbalance source identification. [9][10][11][12] Kim et al 13 compare the voltage unbalance factor (VUF) calculated by several unbalance definitions. Ghijselen and Van den Bossche 14 propose a simplified method to calculate the VUF by only using the line voltage amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Unbalanced source identification at the point of evaluation in the distribution power systems

Sun

Xie

2017

Int Trans Electr Energ Syst

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SummaryThree-phase unbalance is one of the most important power quality problems in the power system. When the system is working under unbalanced conditions, more losses and heating effects will be induced, and the system will become less stable, which is harmful to both utilities and customers. The most important thing for a seriously unbalanced system is to find out the main unbalanced source to take proper measures to mitigate the problem. In this paper, a method is proposed to indentify the main unbalanced source at the point of evaluation (POE) in the distribution power systems. Two extreme cases are analyzed in the paper by assuming that the unbalanced source to be totally from the POE upstream network or downstream network. Therefore, 2 corresponding analytical formulas are derived to reveal the relationship between the POE voltage unbalance factor (VUF) and the current unbalance factor (CUF). A method is then proposed to determine the contribution of the unbalanced source at the upstream and downstream networks based on the comparison between the derived VUFs and the actual VUF. Sensitivity analysis is implemented to show the robustness of the proposed method. The effectiveness and validity of the proposed method is illustrated by the IEEE 13-bus test system and IEEE 37-bus test system. It is shown that the estimation error of the proposed method is generally within 5%.

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“…In many regions, voltage sag has become one of the most concerned power quality problems. And the huge economic loss caused by voltage sags has been the most important problem that many consumers are faced with [2]. In recent years, lots of experts and scholars have done research on the classification (e.g.…”

Section: Introductionmentioning

confidence: 99%

Research on classification of voltage sag sources based on recorded events

Wei

et al. 2017

CIRED - Open Access Proceedings Journal

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In recent years, with the widely application of power electronic devices and stringent requirement of industrial process, voltage sag has caused much attention in many countries. To design effective and efficient mitigation and management strategies, it is essential to have accurate classification of voltage sag sources. In this paper, based on the analysis of massive voltage sag events in the grid recorded by online power quality monitoring systems in several different regions in China, a more extensive and practical classification of voltage sag sources is given. The voltage sags are divided into eight categories due to short circuit faults with symmetric and asymmetric faults included, transformer energizing, induction motor starting, lightning faults, self-extinguishing faults, the combined action of short circuit faults and heavy load starting, upgrade faults and multistage voltage sags. For each category of the voltage sag sources, both the instantaneous value and the root mean square (RMS) value of the waveform of the typical recorded events are given. In addition, the reasons are analysed and the waveform characteristics are summarized for each category of the voltage sag sources. Finally, the frequencies of eight categories under different voltage levels and the statistical result analysis are given.

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Voltage sag source location technology based on corresponding sequence components

Cited by 21 publications

References 19 publications

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Unbalanced source identification at the point of evaluation in the distribution power systems

Research on classification of voltage sag sources based on recorded events

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