Zero-sequence voltage trajectory analysis for unbalanced distribution networks on single-line-to-ground fault condition

Meng, Jun; Wang, Wen; Tang, Xin; Xu, Xiangyang

doi:10.1016/j.epsr.2018.03.024

Cited by 33 publications

(19 citation statements)

References 18 publications

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“…Method and the Method in [21] In TABLE Ⅳ, when Rf is equal to 3000, 5000Ω or 10000Ω, the phase of the largest voltage magnitude is phase B, so the conventional method considers phase A as the faulty phase and results in misjudgment of the faulty phase.…”

Section: Comparison With Conventionalmentioning

confidence: 99%

“…Suppose ФA0=0, according to the fourth group data in TABLE III in [21], we can get α A =225°, so α B =345°, α C =105°. On this condition, according to the fault identification criterion proposed in [21], the specific angle of asymmetry ratio corresponds to Section IV, V and III if the SLG fault happens on phase A, B or C, respectively. We can see that the magnitude and phase of zero-sequence voltage all rise after SLG fault in the fourth group of the abovementioned data.…”

Section: Comparison With Conventionalmentioning

confidence: 99%

“…However, the specific variation of voltage belongs to all the rules corresponding to Section IV, V and III, which makes it impossible to identify the faulty phase. Moreover, the method in [21] needs accurate detection of the distributed parameters, which makes it difficult to implement.…”

Section: Comparison With Conventionalmentioning

confidence: 99%

“…Reference [21] divides the complex plane into five sectors by the phase angle of asymmetry ratio to indicate five kinds of variation of zero-sequence voltage during SLG fault and select the faulty phase by zero-sequence voltage variation rules. However, when the asymmetry ratio locates at the sector boundaries, the difference of the zero-sequence voltage trajectory is not obvious which may lead to misjudgment.…”

Section: Introductionmentioning

confidence: 99%

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Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Wang

Gao

Fan

et al. 2022

IEEE Trans. Power Delivery

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Accurate faulty phase detection under single-line-toground (SLG) fault is the basis of the emerging voltage-based fault arc suppression technology. Most conventional faulty phase recognition criteria assume the distributed line-to-ground parameters are symmetrical, therefore suffering invalidity in actual distribution networks especially under high-resistance ground-fault conditions. This paper firstly analyzes the magnitude and phase angle variation models of the phase-to-ground voltages before and after the SLG fault. Considering the asymmetrical distributed parameters and the line impedance, the specific phaseto-ground voltage variation rules corresponding to SLG fault on each phase are then discussed. Based on the voltage variation rules, a robust and practical method for faulty phase identification is proposed ， which does not need the distributed parameters. Finally, the correctness of the variation rules and the availability of the proposed method is verified by simulation. Comparative study shows the proposed method has better accuracy and applicability with the conventional methods when the asymmetry and ground-fault resistance are high.

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Section: Comparison With Conventionalmentioning

confidence: 99%

Section: Comparison With Conventionalmentioning

confidence: 99%

Section: Comparison With Conventionalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Wang

Gao

Fan

et al. 2022

IEEE Trans. Power Delivery

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“…Electric springs (ESs) have been proposed to achieve a new control concept in power systems that power demand follows power generation dynamically [1]. This kind of smart equipment realised by direct current (DC)/alternative current (AC) inverter [2, 3] can be called AC electric springs (ACES) [4], which is applied in AC power systems with high penetration of renewable energy sources (RESs) [5]. Later on, a new concept to extend ACES to DC applications has been proposed in [6].…”

Section: Introductionmentioning

confidence: 99%

A topology of DC electric springs for DC household applications

Wang

Zha

Deng

et al. 2019

IET Power Electronics

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There are two types of existing direct current (DC) electric spring (DCES), of which the one realised by alternative current electric spring has low power density because of the low-pass filter with big volume, another one is realised by DC/DC converters but too complicated. In this study, aiming at households' applications, a novel topology is proposed for DCES, using a three-port DC/DC converter with a bi-directional boost-buck converter (BBC) paralleled at one port. Critical load (CL), noncritical load (NCL) and power source are located at separate port. Besides the isolation electrically, the most important advantage is that the NCL is no longer in series with DCES, which is possibly the first attempt to change the connection type of a visual NCL with an electric spring (ES) from series to normal parallel way. With the proposed DCES, CL power is regulated stable while the fluctuations are transferred to the NCL. Meanwhile, the DCES does not provide nor absorb active power at steady-state. When the battery voltage reaches its lower or upper limits, the protection mechanism will start to ensure safe operations. The effectiveness of the proposed DCES topology and its control has been validated by simulation and experiment results.

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SCADA System for Monitoring and Reconfiguring an Electrical Distribution Network After a Fault

Turc

Damian²

2022

The 15th International Conference Interdisciplinarity in Engineering

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Zero-sequence voltage trajectory analysis for unbalanced distribution networks on single-line-to-ground fault condition

Cited by 33 publications

References 18 publications

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

Faulty Phase Detection Method Under Single-Line-to-Ground Fault Considering Distributed Parameters Asymmetry and Line Impedance in Distribution Networks

A topology of DC electric springs for DC household applications

SCADA System for Monitoring and Reconfiguring an Electrical Distribution Network After a Fault

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