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Analysis of a 1.7 MVA Doubly Fed Wind-Power Induction Generator during Power Systems Disturbances

HELSINKI UNIVERSITY OF TECHNOLOGY Department of Electrical and Communications Engineering. Analysis of a 1.7 MVA Doubly Fed Wind-Power Induction Generator during Power Systems Disturbances. Slavomir Seman, Sami Kanerva, Antero Arkkio Laboratory of Electromechanics

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Analysis of a 1.7 MVA Doubly Fed Wind-Power Induction Generator during Power Systems Disturbances

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  1. HELSINKI UNIVERSITY OF TECHNOLOGYDepartment of Electrical and Communications Engineering Analysis of a 1.7 MVA Doubly Fed Wind-Power Induction Generator during Power Systems Disturbances Slavomir Seman, Sami Kanerva, Antero Arkkio Laboratory of Electromechanics Helsinki University of Technology Jouko Niiranen ABB Oy, Finland

  2. Overview • Introduction • The Doubly Fed Induction Generator • Frequency Converter and Control • Crowbar • Modeling of The Network, Transformer and Transmission Line • Simulation Results • Conclusions

  3. The Doubly Fed Induction Generator • Transient Model of the Generator • The machine equations x-y reference frame fixed with rotor • Constant speed - no equation of movement included P N 1.7 MW UN, stator (L-L) 690 V (delta) Umax, rotor 2472 V (star) n N 1500 rpm f N, stator 50 Hz

  4. Frequency Converter and Control • Model of the Frequency Converter • Two back-to-back connected voltage source inverters (VSI) • DTC • The Network Side Converter - simplification 1-st order filter transfer function • PI controller Udc -level

  5. The Rotor Side Converter • Model of the Rotor Side Converter • Modified DTC • Input demanded PF or Q , Tref • Voltage vector applied - optimal switching table • The tangential component of the voltage vector controls the torque whereas the radial component increases or decreases the flux magnitude

  6. Over-Current Protection - Crowbar • Passive Crowbar • over-current protection - the rotor, rotor side converter • no chopper mode • disconnection of the converter rotor is connected to CB • CB is active until MCB disconnects stator from the network

  7. Modeling of the Network, Transformer and Transmission Line • Modelling of test set-up • Power supply - SG or 3-phase V source with short circuit reactance and inductance • Transmission line - R-L equivalent circuit • Transformer - short circuit R-L and stray C, no saturation • Short circuiting TR - R-L equivalent circuit

  8. Voltage dip applied MCB open Simulation Results - Voltage Dip without Crowbar Matlab-Simulink, t_step = 0.5e-7, T_ref =0.5 p.u., w_ref = 1.067 p.u., Voltage dip 35% Un

  9. Voltage dip applied MCB open Simulation Results - Voltage Dip without Crowbar

  10. Voltage dip applied MCB open Simulation Results - Voltage Dip with Passive Crowbar Matlab-Simulink, t_step = 0.5e-7, T_ref =0.5 p.u., w_ref = 1.067 p.u., Voltage dip 35% Un

  11. Voltage dip applied MCB open Simulation Results - Voltage Dip with Passive Crowbar

  12. Conclusions • Transient behaviour of DTC controlled DFIG for wind-power applications studied. • The transient simulation results with and without crowbar were compared. • When the crowbar is implemented, the stator and rotor transient current decay rapidly and rotor circuit is properly protected. • Transient electromagnetic torque is reduced by means of crowbar but oscillates longer than in case without crowbar.

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