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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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