Grid-Fault Tolerant Operation of a DFIG Wind Turbine Generator Using a Passive Resistance Network

Yan, Xiangwu; Venkataramanan, G.; Wang, Yang; Dong, Qing; Zhang, Chao

doi:10.1109/tpel.2010.2087037

Cited by 49 publications

(23 citation statements)

References 15 publications

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“…The shaft torque T m is proportionally related to the turbine Energies 2017, 10, 706 12 of 24 torque T t . Based on (22) and (30), the value of T e has to change with the wind speed fluctuation to keep the rotor speed steady.…”

Section: Parametersmentioning

confidence: 99%

“…Although the response is fast, both the observer algorithm and hardware design are complex. The controllability of a DFIG-WT is maintained in [30] by using a passive resistance network when the grid voltage sags. The researchers in [31] proposed a nine-switch grid-side converter to seamlessly ride through different categories of grid faults, while fragility of semiconductor switches was not considered.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances

Liu

et al. 2017

Energies

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This paper investigates the performance of a fault-tolerant four-switch three-phase (FSTP) grid-side converter (GSC) in a doubly-fed induction generator-based wind turbine (DFIG-WT). The space vector pulse width modulation (SVPWM) technique is simplified and unified duty ratios are used for controlling the FSTP GSC. Steady DC-bus voltage, sinusoidal three-phase grid currents and unity power factor are obtained. In addition, the balance of capacitor voltages is accomplished based on the analysis of current flows at the midpoint of DC bus in different operational modes. Besides, external disturbances such as fluctuating wind speed and grid voltage sag are considered to test its fault-tolerant ability. Furthermore, the effects of fluctuating wind speed on the performance of DFIG-WT system are explained according to an approximate expression of the turbine torque. The performance of the proposed FSTP GSC is simulated in Matlab/Simulink 2016a based on a detailed 1.5 MW DFIG-WT Simulink model. Experiments are carried out on a 2 kW platform by using a discrete signal processor (DSP) TMS320F28335 controller to validate the reliability of DFIG-WT for the cases with step change of the stator active power and grid voltage sag, respectively.

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Section: Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances

Liu

et al. 2017

Energies

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“…The above speed change is uncontrollable for a generator having higher electrical and mechanical inertia constants. In order to control the rotor current change, V r r has to be increased based on equation (12). Based on the first reason, the voltage V Φs will be injected in the feed forward path to improve the rotor dip to reach to its near steady state value.…”

Section: A Three Phase Symmetrical or Asymmetrical Faultsmentioning

confidence: 99%

“…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 control techniques [9][10][11][12] were adopted for improving the performance during unbalanced LVRT. Reference current based rotor and grid side converter (RSC and GSC) control schemes for performance improvement during unbalanced faults [13] are analyzed.…”

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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“…A series dynamic braking resistor (SDBR) was used to improve the FRT of large wind farms composed of induction generators in [15], while in [16] the SDBR was connected to the rotor side converter of the DFIG to improve its FRT. The use of superconducting fault current limiter (SFCL) [17], passive resistance network [18], and series antiparellel thyristor [19] connected to the stator side of a grid connected DFIG, have been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Application of SDBR with DFIG to augment wind farm fault ride through

Okedu

Muyeen

Takahashi

et al. 2011

2011 International Conference on Electrical Machines and Systems

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-This paper proposes an application of series dynamic braking resistor (SDBR) connected to the stator side of a doubly fed induction generator (DFIG), for enhancing fault ride through (FRT) capability. Two schemes were investigated; the first scheme uses a bypass switch to show the effect of the SDBR magnitude, while the second one uses a circuit breaker to determine the best insertion time and duration of operation of the SDBR, considering the best SDBR resistance obtained in the first scheme. The proposed schemes were then applied to stabilize a DFIG. Simulation analysis by using PSCAD/EMTDC shows that the SDBR can substantially improve the FRT of the DFIG. It also shows that the size of the SDBR should be determined carefully because large value may worsen the system performance during a grid fault.

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Grid-Fault Tolerant Operation of a DFIG Wind Turbine Generator Using a Passive Resistance Network

Cited by 49 publications

References 15 publications

Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances

Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine (DFIG-WT) with Different External Disturbances

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

Application of SDBR with DFIG to augment wind farm fault ride through

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