Döşoğlu M Kenan
Duzce University, Faculty of Technology, Electrical Electronics Engineering Department, 81620, Konuralp, Duzce, Turkey.
ISA Trans. 2020 Sep;104:321-328. doi: 10.1016/j.isatra.2020.05.024. Epub 2020 May 15.
A crowbar circuit used in doubly fed induction generator (DFIG)-based wind turbines protects the system during transient stability. However, in a large power system, crowbar protection may be insufficient due to over-voltage and inrush currents occurring during balanced and unbalanced faults. Hence, in this study, a crowbar circuit was enhanced for fault ride through capability against balanced and unbalanced faults in a DFIG. The stator and rotor dynamic modeling used a crowbar hardware circuit design with rotor active impedance. Electromotive force voltages were used for the stator-rotor dynamics in the DFIG. Furthermore, crowbar resistance units were designed to meet the fault ride through DFIG requirement. The DFIG behaviors with and without the crowbar hardware circuit design were compared. The balanced and unbalanced faults were also compared in terms of behavior. Results showed that the circuit design of the crowbar hardware enabled the system to promptly become stable and eliminated the oscillations.
双馈感应发电机（DFIG）风力涡轮机中使用的撬棒电路在暂态稳定期间保护系统。然而，在大型电力系统中，由于在平衡和不平衡故障期间出现过电压和浪涌电流，撬棒保护可能不足。因此，在本研究中，增强了撬棒电路以提高DFIG在平衡和不平衡故障下的故障穿越能力。定子和转子动态建模采用了具有转子有源阻抗的撬棒硬件电路设计。电动势电压用于DFIG中的定子 - 转子动态。此外，设计了撬棒电阻单元以满足DFIG故障穿越要求。比较了有和没有撬棒硬件电路设计时DFIG的行为。还比较了平衡和不平衡故障的行为。结果表明，撬棒硬件的电路设计使系统能够迅速变得稳定并消除振荡。
