Inter-Turn Short-Circuit Fault-Ride-Through for DFIG Wind Turbines

Kuichao Ma, jiangsheng zhu, Mohsen N. Soltani, Amin Hajizadeh, Zhe Chen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingBidrag til bog/antologiForskningpeer review


Inter-Turn Short-Circuit (ITSC) of the stator winding is one of the most common
faults in asynchronous generators. A signicant feature of ITSC is the increase of the current
in the faulty phase. Improper treatment may lead to unnecessary power loss or further
deterioration. Therefore, this paper proposes a fault ride-through strategy under the stator
ITSC fault for Doubly-Fed Induction Generator (DFIG) wind turbines. When the closed-loop
state observer detects the fault and the current is higher than the rated current, the faulty wind
turbine switches to down-regulation mode for protecting the faulty generator. The rotational
speed reference is kept at the maximum value. Then the difference between the current and the
rated current with the proportion-integration operation is superimposed to the original generator
torque reference. Simulation results show that the faulty phase current can be decreased to the
rated value, effectively. Although the power output is reduced as well, the impact of the fault
does not develop to a failure. So the faulty wind turbine can continue to operate before the
maintenance. The proposed strategy can avoid the unnecessary power loss caused by shut-down,
improve the operational capacity of wind turbines and reduce the maintenance costs under the
ITSC fault.
TitelThe 21st IFAC World Congress
StatusAfsendt - jul. 2020

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