TK177 : Modeling and Control of Wind-Turbine Used DFIG under Network Fault Conditions
Thesis > Central Library of Shahrood University > Electrical Engineering > MSc > 2011
Authors:
saber naghdi ganji [Author], Ahmad Darabi[Supervisor], Mohsen Assili[Advisor]
Abstarct: Many developed countries are using wind energy in faraway, deprived and operationalmilitary regions. Also in the defense industries through this, required energy for military instruments and equipments in military support areas can be provided. At present, this feasibility in our sea areas is existed where we can build wind farms in the Caspian Sea, Persian Gulf and Oman. Also in smaller case, wind turbines can be made portable and brought to mass production. The increasing penetration of wind turbines employing DFIG, it becomes a necessity to investigate their behavior during transient disturbances and support them with the fault ride through capabilities. This capability means that all generation plants, including wind generation, should have the ability to remain connected during faults and voltage dip conditions within certain limits. Among the types of generators used in wind turbines, double-fed induction generator capabilities are very interesting. The stator of these generators is connected directly to network and their rotor is also connected through a converter to network. Even if the rotor speed is changed, the generators are capable of produce a constant frequency in the voltage of the stator. Using vector control that is one of a very good and quick control method in the induction machine, independent control of active and reactive powers or electromagnetic torque and stator reactive power is possible. In this thesis, firstly using formulas and relationships of field-oriented control, reference fluxes and currents is calculated. Then using direct torque control, predictive currents are presented. Unlike existing methods, which usually use crowbar for remaining wind turbine in the network, in the proposed method does not require any additional equipment and rotor currents during the fault will be regulated. Evaluation of this case has been investigated by the simulation results. At last the transient behavior of the machines is simulated during and after network faults in terminal voltage. The results indicate that the proposed method compared with conventional methods has improved the performance criteria.
Keywords:
#Fault Ride-Through #Doubly-Fed Induction Generator (DFIG) #Simulation #Wind Turbine Control. Link
Keeping place: Central Library of Shahrood University
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