Symmetrical Short Circuit Current Characteristics of Doubly Fed Induction Generator Wind Turbine with Crowbar Protection

Zhai, Jia; Zhang, Bu Han; Wang, Kui; Wen, Shifeng; Mao, Chengxiong

doi:10.4028/www.scientific.net/amr.512-515.782

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…In the literature (Sulla, et al, 2011;Zhai, et al, 2013;Wang et al, 2015;Fu et al, 2017;Rahimi and Azizi, 2019), the flux linkage of the stator was solved simply after the faults at different positions, and in this paper the calculation formula of the DFIG short-circuit current was given under different drop degrees of the terminal voltage, further. However, this method does not take into account rotor current dynamic process effects.…”

Section: Introductionmentioning

confidence: 97%

Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process

Yin

2021

Front. Energy Res.

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With the enlarging scale of doubly-fed induction generators (DFIGs) connected to power systems, it is important to analyze the influence of a short-circuit current to system relay protection. Due to the correct evaluation of the protection operation characteristics, the DFIG short-circuit current needs to be calculated accurately. But the current research on the short-circuit current of DFIG is based on the following assumption: the rotor excitation current is zero after the rotor crowbar is put, and the influence of its dynamic process is ignored. This will bring errors to the calculation results. This paper takes into account the influence of rotor current dynamics by studying the mechanism of the potential transient change of DFIG. The stator rotor flux linkage of DFIG in the event of a three-phase short-circuit is accurately calculated, and an improved RMS calculation method of doubly-fed wind turbine short circuit current is proposed. A physical experiment platform with an actual controller of a doubly-fed fan is established, based on RTDS. It can be seen from the experiment that the short-circuit current calculation method proposed in this paper is more accurate than those methods that ignore the rotor dynamic process. This study lays a foundation for further study of the influence of DFIG on the protection operation characteristics.

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Section: Introductionmentioning

confidence: 97%

Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process

Yin

2021

Front. Energy Res.

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“…Therefore, it is not suitable for deriving the analytical expression of the thermal effect. More accurate analytical expressions of the short current are proposed in the references, which are too complex to be calculated for deriving the thermal effect. The second‐order model of the rotor flux is solved to obtain the expression of the short current with different decaying components and time constants, the square of which is difficult to integrate for quantifying the thermal effect.…”

Section: Introductionmentioning

confidence: 99%

Thermal effect of short current of DFIG and its impact on temperature rise of rotor crowbar

Wang

Huang

et al. 2019

Int Trans Electr Energ Syst

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Summary The analytical expression of the thermal effect of the DFIG with the crowbar activated is proposed. The steady‐state component of the rotor flux is considered to derive the analytical expression of the short current. The thermal effect is given by several components, with the smaller ones ignored to derive the analytical expression of the thermal effect. The relationship among the thermal effect, the temperature rise, and the crowbar resistance is derived. The impacts of the voltage drop, the crowbar resistance, and the wind speed on the thermal effect, and consequently the impact of the thermal effect on the temperature rise of the crowbar, are quantified. The time‐domain analysis is provided to validate the accuracy of the analytical model of the short current and the thermal effect. The proposed model helps to select the electrical component and maintain the safety operation of the DFIG.

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“…The change processes of DFIG fault current with protection circuit are research by physical process analysis method which is based on flux conservation [6,7]. Most research works about fault current are carried on by using the "single -infinite network" model [7][8][9]. This analysis method can be used to analyze the situation that the wind farm access to the strong grid.…”

Section: Introductionmentioning

confidence: 99%

Research on Characteristics of Stator and Rotor Fault Current of DFIG

Zhao¹,

Wen²,

Zha³

et al. 2015

AMR

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The abrupt dip of grid voltage would provoke a series of electromagnetic transient processes in stator and rotor of DFIG, which would threat the security of wind turbines fault ride through (LVRT) and stable operation of power system. Analyzing the fault current characteristics of DFIG is very useful to improve the LVRT strategy and adjust the relay protection setting of power system. In this paper, electromagnetic transient processes of DFIG are given a detail analysis after protection circuit of DFIG works due to the dip of three phase voltage in system. Then, the general expression of stator and rotor fault current is derived, and the validity of this method is verified. At last, the influences of the system short-circuit capacity and wind turbines accessing capacity on the fault current and system protections are analyzed when the wind turbines are accessed to the distribution network.

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Symmetrical Short Circuit Current Characteristics of Doubly Fed Induction Generator Wind Turbine with Crowbar Protection

Cited by 3 publications

References 5 publications

Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process

Research on Short-Circuit Current Calculation Method of Doubly-Fed Wind Turbines Considering Rotor Dynamic Process

Thermal effect of short current of DFIG and its impact on temperature rise of rotor crowbar

Research on Characteristics of Stator and Rotor Fault Current of DFIG

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