Transient current similarity based protection for wind farm transmission lines

Jia, Ke; Li, Yanbin; Fang, Yu; Zheng, Liming; Yang, Qixun

doi:10.1016/j.apenergy.2018.05.012

Cited by 74 publications

(37 citation statements)

References 38 publications

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“…Severe voltage sags at the DFIG terminal will activate the crowbar protection and the RSC is shorted accordingly. Since the converter system is eliminated, the stator-side current can be given as [15], [39]…”

Section: ) Crowbar Protection Switched Inmentioning

confidence: 99%

Improved Amplitude Differential Protection Scheme Based on the Frequency Spectrum Index for Distribution Networks With DFIG-Based Wind DGs

2020

IEEE Access

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With the ever-increasing integration of wind power into the distribution network (DN) in the form of distributed generations (DGs), the optimal application environment for the conventional three-stage overcurrent protection no longer exists. Meanwhile, a majority of advanced protection schemes cannot be implemented due to the lack of voltage information and weak communication conditions in DN. As the most typical wind-based DG used in the DN, the doubly fed induction generator (DFIG)-based DG is focused in this paper. First, the frequency and amplitude characteristics of the fault current supplied by a DFIG-based DG are studied. Then, the amplitude differential protection (ADP) scheme is described using the weak-infeed characteristics of the DFIG-based DG. Furthermore, the frequency spectrum index, which is constructed based on the different frequency characteristics of DFIG-based DGs from synchronous generators, is introduced as a regulator factor to further improve the sensitivity of the ADP. Since only the current amplitude information is needed and the strict synchronization of the sampling data at the two ends of the line is not required, the proposed scheme is easy to implement under the limited hardware conditions in present DN. The simulation results show that the proposed scheme has a high sensitivity to the internal faults and has absolute selectivity for external faults, especially under the existing DG permeability rules. INDEX TERMS Distribution network (DN), distributed generations (DGs), doubly fed induction generator (DFIG), amplitude differential protection (ADP), weak-infeed characteristics, frequency spectrum index.

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Section: ) Crowbar Protection Switched Inmentioning

confidence: 99%

Improved Amplitude Differential Protection Scheme Based on the Frequency Spectrum Index for Distribution Networks With DFIG-Based Wind DGs

2020

IEEE Access

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“…The M-side denotes the PVPP side, whereas the N-side denotes the system side. protection [24][25][26][27][28], they have not discussed the specific fault characteristics of PVPPs or conducted an analysis from a mathematical viewpoint. When compared with previous studies, this study is the first to derive the mathematical expression of the ratio of differential current over restraint current, and its dynamic characteristics are analyzed.…”

Section: Overview Of the Pv Power Plantsmentioning

confidence: 99%

“…Some studies have investigated the influence of the renewable energy power stations on current differential protection[24][25][26][27][28]. However, those studies did not discuss or analyze the specific fault characteristics of PVPPs from a mathematical viewpoint.…”

mentioning

confidence: 99%

Performance Problem of Current Differential Protection of Lines Emanating from Photovoltaic Power Plants

Liang

2020

Sustainability

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The amplitude and phase angle of the fault current in photovoltaic power plants (PVPPs) are significantly influenced by the control system of the grid-connected inverters, unlike in a conventional synchronous source. Hence, PVPPs may adversely affect the performance of the current differential protection designed for synchronous sources-based power grids. In order to study the performance problem of current differential protection on AC transmission lines, an analytical expression of the fault current in the PVPPs was deduced, and the fault current characteristic was extensively analyzed. Based on this analysis, the ratio of differential current over restraint current was initially derived in this study; this ratio is observed to be affected by the control system parameters, power grid system parameters, fault resistance, and fault types. Moreover, the dynamic characteristics of this ratio can be clearly observed based on a three-dimensional diagram. Furthermore, the operating performance of the current differential protection was analyzed under different influencing factors. The mathematical analysis presents that the amplitude ratio of the fault current on both sides of the line is larger than nine and that current differential protection will operate reliably in any case. Meanwhile, the theoretical analysis and simulation results show that the current phase angle difference may become an obtuse angle in case of an ungrounded fault, which will cause inaccurate operation of the current differential protection. The results of this study will provide guidance for the engineering application of current differential protection in case the PVPPs are connected to a power grid.

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“…The magnitude and initial phase angle are determined by the zero-sequence voltage and the impedance of the zero-sequence network, respectively. For synchronous sources, the fault current of traditional synchronous sources has been well studied, and its expression can be expressed as [29,30]:…”

Section: Fault-current Characteristics At a Pv Power Stationmentioning

confidence: 99%

Adaptability Analysis of Fault Component Distance Protection on Transmission Lines Connected to Photovoltaic Power Stations

Liang

Zha

et al. 2019

Energies

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Photovoltaic (PV) power stations tend to have a relatively weak infeed characteristic, unlike conventional synchronous generators. The limited overcurrent capability of power electronic devices and the controllability of grid-connected inverters mean that PV power stations will cause changes in the characteristics of faults on transmission lines. To analyze the adaptability of fault component distance protection on transmission lines connected to PV power stations, a unified phasor expression for the fault current of a PV power station side under various control strategies was deduced in this paper. This expression is then used to derive the equivalent impedance on the PV power station side and the additional impedance. The equivalent impedance and additional impedance are affected greatly by the active and reactive power commands, control targets, and fault conditions. These aspects of a PV power station may cause malfunctions, which can thereby reduce the reliability of fault component distance protection on transmission lines connected to PV power stations. A simulation model of a PV power station was established in PSCAD/EMTDC and the correctness of theoretical analysis was verified by the simulation results.

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Transient current similarity based protection for wind farm transmission lines

Cited by 74 publications

References 38 publications

Improved Amplitude Differential Protection Scheme Based on the Frequency Spectrum Index for Distribution Networks With DFIG-Based Wind DGs

Improved Amplitude Differential Protection Scheme Based on the Frequency Spectrum Index for Distribution Networks With DFIG-Based Wind DGs

Performance Problem of Current Differential Protection of Lines Emanating from Photovoltaic Power Plants

Adaptability Analysis of Fault Component Distance Protection on Transmission Lines Connected to Photovoltaic Power Stations

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