A Series-Dynamic-Resistor-Based Converter Protection Scheme for Doubly-Fed Induction Generator During Various Fault Conditions

Yang, Jin; Fletcher, John; O’Reilly, J.

doi:10.1109/tec.2009.2037970

Cited by 272 publications

(25 citation statements)

References 16 publications

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“…As a result, the DFIG loses the reactive power control ability and operates as a induction motor, which may consume reactive power and deepen the voltage sag. In [7], the rotor braking resistor and chopper protection are adopted for the LVRT. The operation of the protection is controlled by a safety threshold.…”

Section: Proposed Protection Performancementioning

confidence: 99%

“…The protection operates at the moment that the rotor current or the DC-link bus voltage exceeds the safety threshold and exits at the moment that the rotor current or the DC-link bus voltage is under the safety threshold. The comparisons between protection in [7] and the proposed protection in this paper are shown in Figures 18 and 19.…”

Section: Proposed Protection Performancementioning

confidence: 99%

“…This reduces crowbar operating time but cannot avoid blocking the RSC. Employing a series dynamic braking resistor (SDBR) in the stator or rotor circuit, as in [7][8][9], improves transient responses under a grid fault and avoids blocking the RSC. In addition, stator SDBR restrains the rotor current and DC-link voltage significantly and promotes the terminal voltage [8].…”

Section: Introductionmentioning

confidence: 99%

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Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Chen¹,

Yuanhao²,

Zhu³

et al. 2019

Energies

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This paper introduces an improved rotor braking protection circuit configuration and the corresponding self-adaptive control strategy to enhance the low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG). The proposed protection circuit consists of a crowbar circuit and a series rotor braking resistor array, which guarantees the safe operation of wind generators under the LVRT. Moreover, to adapt the proposed protection and further enhance the performance of the improved configuration, a corresponding self-adaptive control strategy is presented, which regulates the rotor braking resistor and protection exiting time automatically through calculating the rotor current in the fault period. The LVRT capability and transient performance of the DFIG by using the proposed method is tested with simulation. Compared with the conventional crowbar protection or the fixed rotor braking protection, the proposed protection and the control strategy present several advantages, such as retaining the control of the rotor side converter, avoiding repeated operation of the protection and accelerating the damping of stator flux linkage during a grid fault.

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Section: Proposed Protection Performancementioning

confidence: 99%

Section: Proposed Protection Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Chen¹,

Yuanhao²,

Zhu³

et al. 2019

Energies

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“…18 The Series Dynamic Resistor (SDR) reduces the stator mode damping during fault and also conduction, and switching loss is incurred. 19 No doubt, these above-mentioned techniques play their own important role in the FRT system during fault. But, for the active solution of the fault current in the DFIG system, fault current limiters (FCL) are used these days.…”

mentioning

confidence: 99%

Enhancement of low‐voltage ride through of wind energy conversion system using superconducting saturated core fault current limiter

Tripathi

Sahoo

Chatterjee

2018

Int Trans Electr Energ Syst

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Summary For enhancing the fault ride through (FRT) capability of doubly fed induction generator (DFIG), the major concern is to remain connected with the grid for maintaining the grid code. For improving this entity, saturated core fault current limiter (SCFCL)‐based protection system has been used in the DFIG system for protecting it from the fault current during fault conditions. The main features of transformer‐type three‐limb SCFCL is that the Alternating Current (AC) coils embedded across the two limbs, and the Direct Current (DC) coils embedded across the other remaining limb. The main features of SCFCL is that the core is saturated during normal operating condition, and during the fault condition, high current generates sufficient magnetic flux in the AC coil, which drives each core out of the saturation. Because of this, SCFCL operates in high‐permeability zone and increases the impedance of the AC coil, which limits the fault current. In this paper, the above behaviour of SCFCL under normal and faulty condition has been analysed by simulated mathematical modelling and verifying it with the experimental setup. In addition to conserve good FRT performance, the fault consequences in DFIG system such as rotor current, DC link voltage, and torque fluctuations are analysed. Also, the simulation result justifies the efficacy of SCFCL compared with the other conventional schemes.

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“…On the other hand, hardware solutions have also been proposed. A DFIG with a crowbar circuit is a very common solution for LVRT [14,15], but this solution is confined to the rotor side, such as limiting DC capacitor voltage and rotor current. A STATCOM can improve the LVRT performance of a wind farm [16], and it is often used in collaboration with crowbar circuits.…”

mentioning

confidence: 99%

Research on Double-Fed Induction Generator Low Voltage Ride Through Based on Double Braking Resistors Using Fuzzy Control

Dong

Pan

et al. 2018

Energies

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The stator side of a double-fed induction generator (DFIG) is directly connected to the grid, so the DFIG is sensitive to a voltage drop caused by power system faults. A double resistors braking method based on fuzzy control is proposed to improve the performance of low-voltage ride through (LVRT) in this paper. Based on the mathematical model of DFIG, it analyzes the function of a series dynamical braking resistor (SDBR) theoretically. The series impedance value of the SDBR is determined by the variation of the rotor's open circuit voltage, the voltage and current of the stator and the rotor, and also the heat capacity of the SDBR. In order to improve the LVRT capability of a DFIG under different fault grads, a double series resistors braking mode is presented. Through adopting a fuzzy control strategy, double series resistor switching is implemented. With the example system, the correctness and validity of the proposed method is verified.Energies 2018, 11, 1155 2 of 16 sequence current compensation strategy can smooth the electromagnetic torque and reactive power during steady-state faults [9,10]. And the optimization of the control strategy is complex in the period of unsymmetrical faults [11][12][13]. On the other hand, hardware solutions have also been proposed. A DFIG with a crowbar circuit is a very common solution for LVRT [14,15], but this solution is confined to the rotor side, such as limiting DC capacitor voltage and rotor current. A STATCOM can improve the LVRT performance of a wind farm [16], and it is often used in collaboration with crowbar circuits. The SDBR in [17] could improve the LVRT capacity of a DFIG, and the bypass switching control mode uses the method introduced in [18]. They realized the switching function of the SDBR when the fault occurred or removed, but it could not change the switching state according to the degree of failure. The switching strategy of different SDBRs and the effect under different power factors are current research topics [19]. The effective position of the SDBR in the DFIG structure was investigated using different types of switching signals in [20,21], but they have no specific research on the SBDR controller.In this paper, a double resistors braking method based on fuzzy control is proposed, which is based on the system characteristics of a DFIG at different voltage drop depths. The double resistance switching mode of an SDBR is also designed. The series resistance values are selected by the open circuit voltage and the resistor's heat capacity. In order to improve the LVRT performance of the DFIG, the fuzzy control mode is used to realize double resistance switching.Compared with existing LVRT devices, the contributions of the proposed method can be described as:(1) There are few studies on the value of series resistance. In addition to the stator and rotor voltage and current, the open circuit voltage and the heat capacity of the brake resistance are considered in this paper, and the range of the braking resistance is designed.(2) The proposed double resista...

show abstract

A Series-Dynamic-Resistor-Based Converter Protection Scheme for Doubly-Fed Induction Generator During Various Fault Conditions

Cited by 272 publications

References 16 publications

Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Enhancement of low‐voltage ride through of wind energy conversion system using superconducting saturated core fault current limiter

Research on Double-Fed Induction Generator Low Voltage Ride Through Based on Double Braking Resistors Using Fuzzy Control

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