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

Jiming Chen, Yuanhao Wang, Mingxiao Zhu, Qianyu Yu and Jiacai Li
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Jiming Chen: College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China
Yuanhao Wang: College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China
Mingxiao Zhu: College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China
Qianyu Yu: College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China
Jiacai Li: College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China

Energies, 2019, vol. 12, issue 10, 1-18

Abstract: 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.

Keywords: DFIG; rotor braking circuit; crowbar; low voltage ride-through; self-adaptive control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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