Principle and Implementation of Current Differential Protection in Distribution Networks With High Penetration of DGs

Gao, Houlei; Li, Juan; Xu, Bingyin

doi:10.1109/tpwrd.2016.2628777

Cited by 152 publications

(79 citation statements)

References 11 publications

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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%

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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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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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“…Differential protection is generally used for microgrid protection due to low short circuit currents in islanded mode of operation [7][8][9][10][11]. Different communication tools as power line carrier [9] and fiber optics are used.…”

Section: Introductionmentioning

confidence: 99%

Inter-trip links incorporated optimal protection coordination

Abbasi

Karegar

Aghdam

2020

IJECE

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Due to advances in smart grid, different communication links as delay, inter-trip and activation are used between relays to enhance the protection system performance. In this paper, the effect of inter-trip links on optimal coordination of directional overcurrent relays (DOCRs) is analytically investigated and modelled. Moreover, an index is proposed to find the optimum locations for inter-trip link installation to reach the minimal fault clearance times under the selectivity constraint. Then a method is proposed to determine the candidate locations of inter-trip links and the associated reduced operating times. An Exhaustive search approach is also used to validate the efficiency of the proposed method. The method is simulated and tested on distribution network of IEEE 33 bus using the Power Factory software and MATLAB optimization toolbox. Genetic algorithm is used as an optimization tool to find optimal settings of relays. The results indicate the capability of proposed method in optimal protection coordination with optimum inter-trips.

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“…Therefore, compared with traditional distribution network, planning and design, control and protection, simulation and analysis for distribution networks with inverter-based DGs are more complicated. This has motivated a considerable number of studies [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Modeling methodology and fault simulation of distribution networks integrated with inverter-based DG

Wang

Gao

Zou

2017

Prot Control Mod Power Syst

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The increasing penetration of inverter-based distributed generations (DGs) significantly affects the fault characteristics of distribution networks. Fault analysis is a keystone for suitable protection scheme design. This paper presents the modelling methodology for distribution networks with inverter-based DGs and performs fault simulation based on the model. Firstly, a single inverter-based DG model based on the cascaded control structure is developed. Secondly, a simulation model of distribution network with two inverter-based DGs is established. Then, different fault simulations are performed based on the Real Time Digital Simulator (RTDS). Theoretical analyses are conducted to justify the simulation results, including the equivalent circuit of distribution networks with inverter-based DGs and the solution method for loop currents.

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Principle and Implementation of Current Differential Protection in Distribution Networks With High Penetration of DGs

Cited by 152 publications

References 11 publications

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

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

Inter-trip links incorporated optimal protection coordination

Modeling methodology and fault simulation of distribution networks integrated with inverter-based DG

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