Analysis of the dynamic behavior of a DFIG during grid disturbances using active crowbar protection

Soliman, Hammam; Marei, Mostafa I.; El-Sharkawy, R.M.; El-Bahrawy, K. M.

doi:10.1109/eeeic.2013.6549609

Cited by 6 publications

(1 citation statement)

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“…In [3], a short circuit of the rotor winding is simulated when the DC-link clamp effect occurs. A flowchart of the crowbar circuit control is proposed in [4]. To avoid over-voltage after a crowbar circuit is triggered, a principle of selecting the crowbar resistance is given by [5].…”

Section: Introductionmentioning

confidence: 99%

A Calculation Method for the Nonlinear Crowbar Circuit of DFIG Wind Generation based on Frequency Domain Analysis

Luo¹,

Lin²,

Yang³

et al. 2016

Journal of Power Electronics

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The ride-through control of a doubly-fed induction generator (DFIG) for the voltage sags on wind farms utilizing crowbar circuits by which the rotor side converter (RSC) is disabled has being reported in many literatures. An analysis and calculation of the transient current when the RSC is switched off are of significance for carrying out the low voltage ride through (LVRT) of a DFIG. The mathematical derivation is highlighted in this paper. The zero-state and zero-input responses of the transient current in the frequency domain through a Laplace transformation are investigated, and the transient components in the time domain are achieved. With the characteristics worked out from the linear resolving without modeling simplification, the selection of the resistance in the linear crowbar circuit and the value conversion from a linear circuit to a nonlinear one is proposed to setup the attenuation rate. In terms of grid code requirements, the theoretical analysis for the time constant of the transient components attenuation insures the controllability when the excitation of the RSC is resumed and it guarantees the reserved time for the response of the reactive power compensation. Simulations are executed in MATLAB/SIMPOWER and experiments are carried out to validate the theoretical analysis. They indicate that the calculation method is effective for selection of the resistance in a crowbar circuit for LVRT operations.

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Section: Introductionmentioning

confidence: 99%