LVRT Capability Enhancement of DFIG With Switch-Type Fault Current Limiter

Guo, Wenyong; Xiao, Liye; Dai, Shaotao; Li, Yuanhe; Xu, Xiaodong; Zhou, Wei; Li, Luo

doi:10.1109/tie.2014.2326997

Cited by 91 publications

(61 citation statements)

References 27 publications

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“…It is clear that the proposed SRFCL can increase the life of the turbine shaft and the gearbox. In [22], the authors introduced switch-type FCL (STFCL) connected in series with the stator circuit of the DFIG as a dedicated topology to improve its LVRT capability. The STFCL topology includes three fault limiting inductors, three isolation transformers, a three phase diode bridge, a snubber capacitor, one SS, and a series connection of a resistance and a very large capacitor to absorb excess energy of the DFIG during the fault condition.…”

Section: Brief Review Of Fault Ride-through Behaviour Of the Dfigmentioning

confidence: 99%

“…Also during the fault condition, a high percentage of the DFIG fault current (about %90) is injected through the stator. Considering these facts, and the research in [22]- [23], three similar sets of the STFCL must be connected in series with the stator of the DFIG. The rating of the STFCL devices must be selected carefully to withstand the rated voltage and current of the stator during the normal condition, as well as the fault condition.…”

Section: Brief Review Of Fault Ride-through Behaviour Of the Dfigmentioning

confidence: 99%

“…Some configuration of the FCLs are employed to increase the LVRT capability of the DFIG based wind turbine in the power network [22][23][24][25]. A three phase FCL including an isolation transformer and a large DC inductance with a bypass resistance located in the stator side of the DFIG is used to restrict the fault current level [22,23]. A single phase bridge type FCL is utilized in the terminal of the DFIG to improve the LVRT capability of the DFIG during all gird faults [24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter

Naderi

Negnevitsky

Jalilian

et al. 2017

International Journal of Electrical Power & Energy Systems

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, "Low voltage ride-through enhancement of DFIGbased wind turbine using DC link switchable resistive type fault current limiter," International Journal of Electrical Power and Energy Systems, vol. 86, pp. 104-119, 2017. Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter Abstract Doubly-fed induction generator (DFIG)-based wind turbines utilise small-scale voltage sourced converters with a limited overcurrent withstand capability, which makes the DFIG-based wind turbines very vulnerable to grid faults. Often, modern DFIG systems employ a crowbar protection at the rotor circuit to protect the rotor side converter (RSC) during grid faults. This method converts the DFIG to a squirrel cage induction generator, which does not comply with the new grid codes. The recent grid codes need wind turbines to stay connected to the utility grid during and after power system faults, especially in high penetration level of wind power. Furthermore, the crowbar switch is expensive. This paper proposes a novel DC-link switchable resistive-type fault current limiter (SRFCL) to improve the LVRT capability of the DFIG. The proposed SRFCL is employed in the DC side of the RSC. The SRFCL solves crowbar protection activation problems and eliminates subsequent complications in the DFIG system. The proposed SRFCL does not have any significant impact on the overall performance of the DFIG during normal operation. Whenever the fault, whether symmetrical or asymmetrical, occurs, the SRFCL not only limits rotor over-currents but also prevents rotor speed acceleration and restricts high torque oscillations even during zero grid voltage, as recommended by some grid codes. To prove the effective operation of the SRFCL on the RSC fault current limitation, analytical analysis is performed in each switching interval. The proposed approach is compared with the crowbar-based protection method. Simulation studies are carried out in PSCAD/EMTDC software. In addition, a prototype is provided to demonstrate the main concept of the proposed approach. Simulation studies are carried out in PSCAD/EMTDC software. In addition, a prototype is provided to demonstrate the main concept of the proposed approach.

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Section: Brief Review Of Fault Ride-through Behaviour Of the Dfigmentioning

confidence: 99%

Section: Brief Review Of Fault Ride-through Behaviour Of the Dfigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter

Naderi

Negnevitsky

Jalilian

et al. 2017

International Journal of Electrical Power & Energy Systems

View full text Add to dashboard Cite

show abstract

“…Literature shows that coordinated operation of SFCL and SMES is employed at the PCC to enhance the FRT and the power fluctuation minimization purpose of DFIG-based wind farm [27]. Switched-type FCL and high temperature superconducting fault current limiter (HTS-FCL) are employed in [28,13], respectively, for enhancing the FRT capability of the DFIG-based wind generator. Resistor-based superconducting fault current limiter (SFCL) [25,29] and HTS-FCL [30] are placed at the PCC point in order to enhance the transient stability of synchronous generator (SG)-based singlemachine-infinite-bus (SMIB) power system.…”

Section: Introductionmentioning

confidence: 99%

Transient stability augmentation of PV/DFIG/SG-based hybrid power system by parallel-resonance bridge fault current limiter

Hossain

Ali

2016

Electric Power Systems Research

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“…These methods are also cost effective with sophisticated techniques. The LVRT with external devices like fault current limiter are used to suppress surge currents produced in the rotor during severe faults [22][23][24]. In the above control schemes, the torque is fixed to zero and the reactive power must be drawn from the grid.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of DFIG During Asymmetrical Grid Disturbances Using Internal Model Controller and Resonant Controller

Ananth¹,

Kumar

2016

ijeei

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In this paper, grid disturbances like asymmetrical sag and swell faults in phase-A are analyzed for the grid connected DFIG. The dynamic behavior of DFIG is compared and tabulated with results using state error compensators like PI, PI with resonant (PIR) and internal model control (IMC) on rotor side converter (RSC). The RSC is designed analytically with enhanced field oriented control (EFOC) technique for better performance during such grid disturbances. In this technique, rotor flux reference changes from synchronous speed to some smaller speed or zero during the fault for injecting current at the rotor slip frequency. In this process, DC-Offset component of flux is controlled in not decomposing into a lower value of faults and maintaining it. This offset decomposition of flux will be oscillatory in conventional FOC, whereas in EFOC with internal model controller, flux can damp quickly not only for single fault but multiple faults. This strategy can regulate stator and rotor current waveform to sinusoidal without much distortion during and after fault. It has better damped torque oscillations, control in rotor speed and generator flux during and after fault. The fluctuations in DC bus voltage across capacitor are also controlled using proposed EFOC technique. The system performance with phase-A over voltage and under-voltage with above controllers and EFOC technique are analyzed using simulation studies.Keywords: Asymmetrical grid disturbance; DFIG; Field oriented control; Internal model control (IMC); PI and resonant controoller (PIR); unbalanced and distorted load. INTRODUCTIONIn the comparison between other wind turbines driven generators, the doubly fed induction generator (DFIG) is having more advantages. The major reasons like better real and reactive power capability, variable speed constant frequency operation etc. make it to stand at the top of all. However, it is sensitive to asymmetrical grid disturbances like single phase or two phase's voltage disturbances as it are directly connected to grid. Based on modern grid rules, DFIG needs to operate effectively on asymmetrical faults and also under unbalanced and distorted loading conditions.The status of research on the LVRT issue for DFIG for symmetrical and asymmetrical faults and comparison of different control strategies is given in [1]. Understanding the capability of RSC to deliver desired reactive power and withstanding capability during fault in [2]. LVRT enhancement based on flux trajectory [3], effect of different types of faults were studied in [4] for DFIG. Controlling DC link current of RSC to smoothen DC voltage fluctuations due to grid faults by using stored Kinetic Energy [5] is proposed in this paper. RSC with static damping resistor placed in series with stator windings to limit torque oscillations and transient response is done in [6]. FFTC scheme with PIR [7] and PI [8] are adopted for symmetrical and asymmetrical faults for improving uninterrupted P, Q supply from wind turbine (WT) to grid. Few control phase sequence cont...

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LVRT Capability Enhancement of DFIG With Switch-Type Fault Current Limiter

Cited by 91 publications

References 27 publications

Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter

Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter

Transient stability augmentation of PV/DFIG/SG-based hybrid power system by parallel-resonance bridge fault current limiter

Performance Evaluation of DFIG During Asymmetrical Grid Disturbances Using Internal Model Controller and Resonant Controller

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