Low Voltage Ride-through in DFIG Wind Generators by Controlling the Rotor Current without Crowbars

Arribas, J. R.; Fernández-Rodríguez, Adrián; Muñoz, Ángel G.; Nicolás, Carlos Veganzones

doi:10.3390/en7020498

Cited by 12 publications

(11 citation statements)

References 17 publications

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“…In this context, several papers in the literature address the behavior of WECS during voltage sags and propose strategies to improve the system RTFC. The issue of the LVRT in DFIG-based technology is a topic extensively discussed in the literature, and several strategies are proposed to improve the system response, as presented in papers [5][6][7][8][9][10]. The RTFC of PMSG-based technology is simpler, since the use of a full scale back-to-back converter decouples the grid and generator sides [4,11].…”

Section: Introductionmentioning

confidence: 99%

Low Voltage Ride-Through Capability Solutions for Permanent Magnet Synchronous Wind Generators

et al. 2016

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Due to the increasing number of wind power plants, several countries have modified their grid codes to include specific requirements for the connection of this technology to the power system. One of the requirements is the ride-through fault capability (RTFC), i.e., the system capability to sustain operation during voltage sags. In this sense, the present paper intends to investigate the behavior of a full-converter wind generator with a permanent magnet synchronous machine during symmetrical and asymmetrical voltage sags. Two solutions to improve the low voltage ride-through capability (LVRT) of this technology are analyzed: discharging resistors (brake chopper) and resonant controllers (RCs). The design and limitations of these solutions and the others proposed in the literature are discussed. Experimental results in a 34 kW test bench, which represents a scaled prototype of a real 2 MW wind conversion system, are presented.

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Section: Introductionmentioning

confidence: 99%

Low Voltage Ride-Through Capability Solutions for Permanent Magnet Synchronous Wind Generators

et al. 2016

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“…One is to improve the micro-grid's FRT capability, and the other is to make the micro-grid carry out a smooth transition between its grid-connected and islanded modes when some permanent or serious faults occur; (2) Since the SFCL is installed at the transmission line with an important load, it is able to improve the service stabilities of the load; (3) If the SFCL is installed at the integration point of DG units, it can be used to improve the DG's FRT capability, in particular under the internal fault condition. It is well known that most of the DG units are connected to the micro-grid through inverters, and these inverter interfaced DGs (IIDGs) have highly variable characteristics and should meet the FRT requirements [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

Chen

et al. 2016

Energies

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Abstract:Concerning the development of a micro-grid integrated with multiple intermittent renewable energy resources, one of the main issues is related to the improvement of its robustness against short-circuit faults. In a sense, the superconducting fault current limiter (SFCL) can be regarded as a feasible approach to enhance the transient performance of a micro-grid under fault conditions. In this paper, the fault transient analysis of a micro-grid, including distributed generation, energy storage and power loads, is conducted, and regarding the application of one or more flux-coupling-type SFCLs in the micro-grid, an integrated technical evaluation method considering current-limiting performance, bus voltage stability and device cost is proposed. In order to assess the performance of the SFCLs and verify the effectiveness of the evaluation method, different fault cases of a 10-kV micro-grid with photovoltaic (PV), wind generator and energy storage are simulated in the MATLAB software. The results show that, the efficient use of the SFCLs for the micro-grid can contribute to reducing the fault current, improving the voltage sags and suppressing the frequency fluctuations. Moreover, there will be a compromise design to fully take advantage of the SFCL parameters, and thus, the transient performance of the micro-grid can be guaranteed.

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“…Under unbalanced fault conditions, there are various control strategies available for the LVRT requirement of the DFIG [26][27][28][29][30][31][32][33]. Therefore, the effect of the control strategy on the fault current characteristics of the DFIG must be considered.…”

Section: Simulation Studymentioning

confidence: 99%

Fault Current Characteristics of the DFIG under Asymmetrical Fault Conditions

2015

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During non-severe fault conditions, crowbar protection is not activated and the rotor windings of a doubly-fed induction generator (DFIG) are excited by the AC/DC/AC converter. Meanwhile, under asymmetrical fault conditions, the electrical variables oscillate at twice the grid frequency in synchronous dq frame. In the engineering practice, notch filters are usually used to extract the positive and negative sequence components. In these cases, the dynamic response of a rotor-side converter (RSC) and the notch filters have a large influence on the fault current characteristics of the DFIG. In this paper, the influence of the notch filters on the proportional integral (PI) parameters is discussed and the simplified calculation models of the rotor current are established. Then, the dynamic performance of the stator flux linkage under asymmetrical fault conditions is also analyzed. Based on this, the fault characteristics of the stator current under asymmetrical fault conditions are studied and the corresponding analytical expressions of the stator fault current are obtained. Finally, digital simulation results validate the analytical results. The research results are helpful to meet the requirements of a practical short-circuit calculation and the construction of a relaying protection system for the power grid with penetration of DFIGs.

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Low Voltage Ride-through in DFIG Wind Generators by Controlling the Rotor Current without Crowbars

Cited by 12 publications

References 17 publications

Low Voltage Ride-Through Capability Solutions for Permanent Magnet Synchronous Wind Generators

Low Voltage Ride-Through Capability Solutions for Permanent Magnet Synchronous Wind Generators

Technical Evaluation of Superconducting Fault Current Limiters Used in a Micro-Grid by Considering the Fault Characteristics of Distributed Generation, Energy Storage and Power Loads

Fault Current Characteristics of the DFIG under Asymmetrical Fault Conditions

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