access icon free Comparison among series compensators for transient stability enhancement of doubly fed induction generator based variable speed wind turbines

This study investigates the effects of series compensators, such as the dynamic voltage restorer (DVR), series dynamic braking resistor, thyristor switched series capacitor, and the high temperature superconducting fault current limiter (SFCL), in enhancing the transient stability of a doubly fed induction machine based variable speed wind generator system. The tested system consists of a 9 MW doubly fed induction generator based wind farm connected to an infinite bus through two step-up transformers and a double run transmission lines. A three-phase-to-ground (3LG) fault and a single-line-to-ground fault (1LG) were applied to one of the lines to demonstrate the transient stability enhancement ability of the series devices. A performance comparison among the four series compensators is made based on responses of active/reactive power, terminal voltage, rotor speed, dc link voltage, and current variations. Simulations were carried out in the MATLAB/Simulink environment. Simulation results show that all series devices can improve the transient stability, however, the SFCL is the most efficient in terms of active power, rotor speed stability and fault current suppression, and the DVR seems to have a better performance than the SFCL in terms of voltage and reactive power.

Inspec keywords: power transformers; power transmission lines; power system restoration; static VAr compensators; power transmission protection; superconducting transmission lines; wind turbines; thyristor applications; wind power plants; rotors; asynchronous generators; superconducting fault current limiters; power system transient stability

Other keywords: series devices; 3LG; variable speed wind generator system; transient stability enhancement; three-phase-to-ground fault; series dynamic braking resistor; variable speed wind turbine; active power; wind farm; double run transmission lines; SFCL; DVR; series compensator; dynamic voltage restorer; doubly fed induction generator; thyristor switched series capacitor; fault current suppression; high temperature superconducting fault current limiter; doubly fed induction machine; rotor speed stability; power 9 MW; reactive power; step-up transformers

Subjects: Stability in control theory; Power system management, operation and economics; Control of electric power systems; Wind power plants; Protection apparatus; Power system control; Other superconducting devices and material applications; Transformers and reactors; Asynchronous machines; Power transmission lines and cables

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