考虑撬棒保护的DFIG等效序阻抗研究

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Abstract The characteristics of doubly fed induction generator(DFIG)equivalent sequence impedances(ESIs)have a huge impact on fault component based relay protections.To provide theoretical basis for DFIG ESIs and related transient studies,the definition of DFIG ESIs is first given.Analytical equations of DFIG ESIs under activated crowbar protection are derived based on stator fault sequence currents.Characteristics and significant factors of DFIG ESIs are studied in detail.It is observed that equivalent positive sequence impedance has an evident transient change process while equivalent negative sequence impedance doesn't.The amplitude of the former is larger and fluctuant while the latter is smaller,and the steady phase angle of the former is between -90° and -180° while the latter is between 0°and 90°.Finally,the theoretical analysis are verified by simulation experiments.

Key words： Doubly fed induction generator crowbar protection equivalent sequence impedances amplitude and angle transient variation characteristic

Received: 06 April 2016 Published: 12 May 2017

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TM77

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	Articles by authors
	Huang Tao
	Lu Yuping
	Wang Ye

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Huang Tao,Lu Yuping,Wang Ye. Study on Equivalent Sequence Impedances of DFIG with Crowbar Protection[J]. Transactions of China Electrotechnical Society, 2017, 32(9): 160-168.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I9/160

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