Comparison of short-circuit current contribution of Doubly-Fed induction generator based wind turbines and synchronous generator

El-Naggar, Ahmed; Rueda, José L.; Erlich, I.

doi:10.1109/ptc.2013.6652307

Cited by 22 publications

(11 citation statements)

References 7 publications

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“…More specifically, differences higher than -10% are observed in several cases and especially in Topology II of scenario 2, as well as when a fault occurs near to the DG unit. Similar remarks are also highlighted in [5] and [14], indicating that the modelling of such types of generators in IEC 60909 needs to be investigated in more detail.…”

Section: Sc Calculations By Dg Unit Typesupporting

confidence: 59%

Comparison of static and dynamic calculations of short circuit currents in distributed generation networks

Kontis

Dimos

Papadopoulos

et al. 2014

2014 49th International Universities Power Engineering Conference (UPEC)

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Distributed Generation (DG) units connected to the distribution network, contribute to the increase of the system fault level. Hence the knowledge of the exact contribution to the fault level by each DG unit is very important. In this paper the calculation of the short circuit current in distribution networks with DG units is carried out following two different approaches. The first approach is the IEC 60909 standard, which although adopts several simplifications and assumptions, in most cases provides results on the safe side. On the other hand dynamic simulations using dynamic tools such as the NEPLAN software are used for the accurate simulation of short circuit currents. Several parameters that influence the short circuit current, such as the length of the distribution feeders and the number of the integrated generators connected to the grid are investigated. From the comparison of the results by both approaches a better understanding of the influence of all parameters and assumptions used in short-circuit calculations is concluded.

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Section: Sc Calculations By Dg Unit Typesupporting

confidence: 59%

Comparison of static and dynamic calculations of short circuit currents in distributed generation networks

Kontis

Dimos

Papadopoulos

et al. 2014

2014 49th International Universities Power Engineering Conference (UPEC)

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“…The fault response of a closed-loop decoupled controlled DFIG is represented in [22,23], where the short-circuit current contains three decaying transient currents and a steady-state current given by…”

Section: Dfig Dynamic Model and Fault Responsementioning

confidence: 99%

Short‐circuit current reduction techniques of the doubly‐fed induction generator based wind turbines for fault ride through enhancement

El-Naggar

Erlich

2017

IET Renewable Power Generation

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Grid voltage disturbances result in high magnitudes of rotor currents and DC-link voltage of the doubly-fed induction generator based wind turbines (DFIG-WTs), which may lead under severe fault conditions into deactivation of the machine side converter (MSC) and violation of the fault ride through (FRT) requirements of the grid codes. In this essence, several solutions were proposed, which vary between installing extra hardware components and control modification. However, the extra costs as well as the control limitations degrade the feasibility of the proposed solutions. In this study, new techniques are proposed to enhance the FRT through peak short-circuit current reduction of the DFIG-WT. The new techniques are developed based on the open-loop and close-loop dynamic response of the DFIG. The new techniques utilise the available MSC voltage, in order not to violate the voltage limits, to increase the rate of change of the DFIG internal transient voltage and to increase the magnitude of the transient impedance. Additionally, the mean variance mapping optimisation is used to optimally tune the gains in the second two techniques. The new techniques were implemented in a manufacturer-based simulation model, and the simulation results show their effectiveness, where the maximum peak current reduction achieved was 23.6%.

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“…Nevertheless, fault current contribution coming from renewable energies is very different than traditional synchronous generation due to thermal limits of power electronics. This thermal limit is needed for a relay fast limitation of the current, in just two or three cycles, during a short circuit condition to avoid damage in the converters, which causes a very low current contribution in comparison to the synchronous generation [3][4][5]. Since most of the implemented protection functions in transmission and distribution grids consider the current to detect the fault condition (overcurrent, distance, line differential, pilot schemes .…”

Section: Introductionmentioning

confidence: 99%

Improved Faulted Phase Selection Algorithm for Distance Protection under High Penetration of Renewable Energies

et al. 2020

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The high penetration of renewable energies will affect the performance of present protection algorithms due to fault current injection from generators based on power electronics. This paper explains the process followed for analyzing this effect on distance protection and the development of a new algorithm that improves its performance in such a scenario. First of all, four commercial protection relays were tested before fault current contribution from photovoltaic system and full converter wind turbines using the hardware in the loop technique. The analysis of results obtained, jointly with a theoretical analysis based on commonly used protection strategy of superimposed quantities, lead to a conclusion about the cause of observed wrong behaviors of present protection algorithms under a high penetration of renewables. According to these conclusions, a new algorithm has been developed to improve the detection of faulted phase selection and directionality on distance protection under a short circuit current fed by renewable energy sources.

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Comparison of short-circuit current contribution of Doubly-Fed induction generator based wind turbines and synchronous generator

Cited by 22 publications

References 7 publications

Comparison of static and dynamic calculations of short circuit currents in distributed generation networks

Comparison of static and dynamic calculations of short circuit currents in distributed generation networks

Short‐circuit current reduction techniques of the doubly‐fed induction generator based wind turbines for fault ride through enhancement

Improved Faulted Phase Selection Algorithm for Distance Protection under High Penetration of Renewable Energies

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