Doubly Fed Induction Generator Wind Turbine Systems Subject to Recurring Symmetrical Grid Faults

• Published in: IEEE transactions on power electronics Vol. 31; no. 2; pp. 1143 - 1160
• Main Authors: Wenjie Chen, Blaabjerg, Frede, Nan Zhu, Min Chen, Dehong Xu
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit faults; Converters; Electric currents; Electric potential; Electricity distribution; Fault currents; Faults; Flux; Generators; Induction generators; Mathematical model; Mathematical models; Power system faults; Reliability; Rotors; Stators; Transient analysis; Turbines; Voltage; Voltage control; Voltage fluctuations; Wind power generation; Wind turbines; power system faults; Converters; fault currents; wind power generation; reliability
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2015.2418791

New grid codes demand the wind turbine systems to ride through recurring grid faults. In this paper, the performance of the doubly Ffed induction generator (DFIG) wind turbine system under recurring symmetrical grid faults is analyzed. The mathematical model of the DFIG under recurring symmetrical grid faults is established. The analysis is based on the DFIG wind turbine system with the typical low-voltage ride-through strategy-with rotor-side crowbar. The stator natural flux produced by the voltage recovery after the first grid fault may be superposed on the stator natural flux produced by the second grid fault, so that the transient rotor and stator current and torque fluctuations under the second grid fault may be influenced by the characteristic of the first grid fault, including the voltage dips level and the grid fault angle, as well as the duration between two faults. The mathematical model of the DFIG under recurring grid faults is verified by simulations on a 1.5-MW DFIG wind turbine system model and experiments on a 30-kW reduced scale DFIG test system.