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

Wang, Wen; Gao, Xiong; Fan, Bo; Zhang, Xiangjun; Yao, Ganzhou

doi:10.1109/tpwrd.2021.3091646

Cited by 23 publications

(6 citation statements)

References 22 publications

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“…In distribution systems, based on engineering practices and literature studies, some characteristics and their combinations are selected to be used as main indicators for fault detection and protection, such as line voltage phasor, line current phasor, phase voltage phasor, iA-iO and voltage phasors, harmonic, frequency spectrum, travelling waves and so on [6][7][8][9][10]. The SGF has traditionally been diagnosed based on iA-iO, residual voltage, and their derived quantities, including transient and steady-state amplitude, phase's change and difference, admittance, active power, harmonic, current and waveform.…”

Section: Introductionmentioning

confidence: 99%

Research on eigenparameters and detection methods for single‐phase‐to‐ground faults in non‐effectively grounded distribution systems

Sheng

Song

2023

IET Cyber-Phy Sys Theory & Ap

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Non‐effectively grounded power distribution systems (NGDS) are widely used in China and other countries. However, over a long time, single‐phase‐to‐ground faults (SGF) have been misjudged or omitted by the monitoring system, threatening the security of the power supply system and human safety. Based on the reason analysis for the omitted and misjudged SGFs in NGDS, the concept of NGDS fault eigenparameters to correctly reflect fault characteristics and a method of SGF detection based on fault eigenparameters are proposed. Then, the detection mechanism of phase voltage and fault current resistive elements for SGF is revealed. The variation characteristics of typical fault parameters changing with distribution system scale (parameter) and fault transition resistance, such as residual voltage and Zero‐sequence current (iA‐iO), are analysed. The eigenparameters of SGF in certain NGDS with specific scales/parameters are also proposed, which can correctly reflect the fault characteristics under different transition resistances.

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Section: Introductionmentioning

confidence: 99%

Research on eigenparameters and detection methods for single‐phase‐to‐ground faults in non‐effectively grounded distribution systems

Sheng

Song

2023

IET Cyber-Phy Sys Theory & Ap

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“…An amount of research works have been devoted to the field of passivity evaluation and enhancement for GCIs [6]- [18]. It has been found that the computation and pulse width modulation (PWM) delays have significant effects on the passivity of the GCI [6].…”

Section: Introductionmentioning

confidence: 99%

Passivity-Oriented Design of LCL-Type Grid-Connected Inverters With Luenberger Observer-Based Active Damping

Zhao

Xie

et al. 2022

IEEE Trans. Power Electron.

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The frequency-domain passivity theory offers an effective way to assess the stability of inverters in a complex grid. In this paper, a unified impedance model, suitable for either inverter-current control (ICC) or grid-current control (GCC) of LCL-type grid-connected inverters (GCIs) with observer-based capacitor current feedback active damping (OAD), is built to facilitate the passivity-based stability assessment and controller parameter design. With the passivity analysis, it is found that when the anti-resonant frequency of LCL-filter is in certain ranges, i.e., (0.056ωs, 0.20ωs) for ICC and (0.046ωs, 0.23ωs) for GCC, all frequencies' passive output admittance of the inverter can be achieved via proposed parameter design guidelines. Due to the utilization of the observer and all frequencies' passive output admittance property, not only extra current sensors for active damping can be saved, but also the inverter can be connected and stably operated in a grid regardless of the grid impedance. The validity of the theoretical analysis and effectiveness of the proposed method is verified by using experimental results on a laboratory prototype.

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“…However, this method needs to detect the fault phase and fault line in advance and is greatly affected by system asymmetry. At present, zero-sequence voltage and zero-sequence current are the most widely used characteristics to determine whether an SPGF occurs [30]. erefore, the transition resistance parameters can be obtained indirectly by measuring the zero-sequence parameters.…”

Section: Introductionmentioning

confidence: 99%

Single-Phase Grounding Fault Identification Based on Transition Conductance Tracking Method

Fang

Cai

et al. 2022

Mathematical Problems in Engineering

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The instability of single-phase grounding faults makes it difficult to track the fault development process accurately. In this paper, a transition conductance tracking method for single-phase grounding fault identification is established to perceive the health state of the distribution network. To solve the situation that the insulation parameters of the neutral ungrounded system are difficult to obtain, a phase-shift method is proposed to measure the insulation parameters accurately. Based on the measurement results of insulation parameters, a transition conductance tracking model is constructed to monitor the changes of transition conductance in real time. Since the transition conductance varies steadily, it can be used as an important parameter to evaluate the development of a single-phase grounding fault. The innovative tracking method is verified by the simulation model, and the error analysis shows that the tracking error of transition conductance is less than 9%. The simulation results demonstrate that the proposed method can track the development of grounding faults effectively and give a quick warning to the operator. The fault identification theory adopted in this paper is not limited by the neutral grounding mode and especially can be applied to situations where the neutral point parameters are not adjusted.

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

Cited by 23 publications

References 22 publications

Research on eigenparameters and detection methods for single‐phase‐to‐ground faults in non‐effectively grounded distribution systems

Research on eigenparameters and detection methods for single‐phase‐to‐ground faults in non‐effectively grounded distribution systems

Passivity-Oriented Design of LCL-Type Grid-Connected Inverters With Luenberger Observer-Based Active Damping

Single-Phase Grounding Fault Identification Based on Transition Conductance Tracking Method

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