Comparison of active crowbar protection schemes for DFIGs wind turbines

Sava, Gabriela Nicoleta; Costinaş, Sorina; Golovanov, Nicolae; Leva, Sonia; Duong, Minh Quan

doi:10.1109/ichqp.2014.6842860

Cited by 30 publications

(12 citation statements)

References 11 publications

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“…Its protection method consists of short-circuiting the rotor and disabling the rotor converter control. This creates an additional path for the rotor currents for mitigating the over-voltages that may appear on the DC bus, or suppressing the over-currents in rotor winding determined by the transients [14,40].…”

Section: Crowbar Protectionmentioning

confidence: 99%

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A Comparative Study on Controllers for Improving Transient Stability of DFIG Wind Turbines During Large Disturbances

et al. 2018

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Abstract:Under power system short-circuits, the Doubly-Fed Induction Generator (DFIG) Wind Turbines (WT) are required to be equipped with crowbar protections to preserve the lifetime of power electronics devices. When the crowbar is switched on, the rotor windings are short-circuited. In this case, the DFIG behaves like a squirrel-cage induction generator (SCIG) and can adsorb reactive power, which can affect the power system. A DFIG based-fault-ride through (FRT) scheme with crowbar, rotor-side and grid-side converters has recently been proposed for improving the transient stability: in particular, a hybrid cascade Fuzzy-PI-based controlling technique has been demonstrated to be able to control the Insulated Gate Bipolar Transistor (IGBT) based frequency converter in order to enhance the transient stability. The performance of this hybrid control scheme is analyzed here and compared to other techniques, under a three-phase fault condition on a single machine connected to the grid. In particular, the transient operation of the system is investigated by comparing the performance of the hybrid system with conventional proportional-integral and fuzzy logic controller, respectively. The system validation is carried out in Simulink, confirming the effectiveness of the coordinated advanced fuzzy logic control.

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Section: Crowbar Protectionmentioning

confidence: 99%

“…The crowbar protection is applied for securing the power converter and rotor windings against over-voltages and over-currents determined by short-circuits in the main grid [14][15][16][17][18]. When the crowbar is inserted, during the short-circuit period, the rotor is in short circuit and the RSC is blocked.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Controllers for Improving Transient Stability of DFIG Wind Turbines During Large Disturbances

et al. 2018

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“…In particular, flywheel-based energy storage system and superconducting magnetic energy storage are proposed for smoothing wind farm output in [7] and [8], respectively. Many studies are conducted also on the effect of wide penetration of wind energy on power system related to transient stability, since wind power generation is increasing considerably [9], [10], [11] and [12]. One of challenges is that wind speed is not constant and wind power output is proportional to the cube of wind speed, which causes the generated power of SCIG to fluctuate as well as faults happen on the transmission line near WTGS can lead to SCIG overspeed and cause instability of network [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Hybrid controller for transient stability in wind generators

Duong

Grimaccia

Leva

et al. 2015

2015 Clemson University Power Systems Conference (PSC)

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In wind power plants typically squirrel-cage induction generators (SCIG) tend to drain large amount of reactive power from the grid, potentially causing a drop voltage. To improve SCIG's power quality and transient stability, this paper investigates a new pitch angle control strategy, including normal scheme and Fault-Ride-Through (FRT) scheme, based on hybrid of PI and Fuzzy logic technique. In particular, an analytic model for transient stability is implemented using the equivalent circuit of the SCIG and on the concepts of stable and unstable electrical-mechanical equilibrium. This method has been evaluated by comparing the results with the dynamic simulation. The dynamic simulation results show that the proposed hybrid controller can be effective in enhancing output power smoothness and FRT requirements for SCIG in wind power system

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“…Nowadays, most of the wind energy conversion systems (WECS) usually employ variable speed wind turbine generation systems (WTGS) [4,5]. However, before the year 2000, WECS were made by fixed-speed induction generators (FSIG), in particular squirrel-cage induction generators (SCIG), which were largely used in power systems because of their reliability, low cost and robustness.…”

Section: Introductionmentioning

confidence: 99%

Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller

et al. 2015

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A common problem in wind power plants involves fixed-speed wind turbines. In fact, being equipped with a squirrel-cage induction generator (SCIG), they tend to drain a relevant amount of reactive power from the grid, potentially causing voltage drops and possible voltage instability. To improve SCIG power quality and transient stability, this paper investigates a new control strategy for pitch angle control based on proportional-integral (PI) controller and a fuzzy logic controller (FLC), considering both normal and fault ride-through (FRT) schemes. In the literature, often, the mechanical torque output is assumed constant for a specific wind speed. This might not be accurate, because the mechanical torque-speed typical of a wind turbine depends also on the power coefficient or pitch angle. In this paper, an analytic model of transient stability is proposed using the equivalent circuit of the SCIG and using the concepts of stable and unstable electrical-mechanical equilibrium. The method has been evaluated by comparing the results obtained by the analytic method with the dynamic simulation. The results show that the proposed hybrid controller is effective at smoothing the output power and complying with FRT requirements for SCIG in the power system.

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Comparison of active crowbar protection schemes for DFIGs wind turbines

Cited by 30 publications

References 11 publications

A Comparative Study on Controllers for Improving Transient Stability of DFIG Wind Turbines During Large Disturbances

A Comparative Study on Controllers for Improving Transient Stability of DFIG Wind Turbines During Large Disturbances

Hybrid controller for transient stability in wind generators

Improving Transient Stability in a Grid-Connected Squirrel-Cage Induction Generator Wind Turbine System Using a Fuzzy Logic Controller

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