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Monday 26 May 2014

COMPARISON OF TRANSIENT BEHAVIORS OF DFIG WIND TURBINE

 Abstract--
DFIG is the emerging technology for wind turbine and still it is needed to improve the
performance of it during the fault situations. So, in this project my objective is to determine
the transient behaviors of the DFIG wind turbine under different operating conditions and
compare it.
Control circuitry of DFIG consists of two converters. Rotor-side and Grid-side
converters. Here I have designed both the converters and performed the simulation of the
transmission line having faults during different operating conditions like under sub- and
super-synchronous.
The waveforms shown includes the Generated active power, Generated reactive
power, speed of the turbine, pitch angle etc. the waveforms are vary during the different
faults. At the same grid voltage drop, if the initiation generator speed is higher, the active and
reactive power has a larger oscillation. However, in the low speed, the variation time of the
generator speed is larger and the pitch angle of the shaft system is constant. Under fixed
voltage operation strategy, the wind power generation system could help increase the voltage
level of stator terminals by regulating its reactive power output. Therefore, the ability of fault
ride-through and transient stability of the wind farm are improved.
During serious disturbances of the grid, such as a three-phase ground fault, the
power balance between two sides of the DC-Link are destroyed, causing the voltage to
increase rapidly and reach the over-voltage limit in short time, protection schemes are
triggered to protect damage on the wind turbine system. Therefore, taking measures to
limit rotor power output and reduce the power imbalance of the converters under large
disturbances so that the grid-connection is preserved are of importance to increase the
ability of fault ride-through and the global transient stability and dynamic voltage
stability of wind power generation system.
 





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