Transient Stability Improvement of Grid Connected Wind Generator: A Comparison between SVC and STATCOM

Recently Flexible AC Transmission System (FACTS) devices have been used for flexible power flow control, secure loading and damping of power system oscillation. Some of those are used also to improve transient and dynamic stability of wind power generation system (WPGS). Transient stability control plays a significant role in ensuring the stable operation of power systems in the event of large disturbances and faults. Due to the nature of asynchronous operation, system instability of WPGS is largely caused by the excessive reactive power absorption by induction generators after fault due to the large rotor slip gained during fault. This paper studies system stability of wind farms based on fixed speed induction generators. The use of the Static Var Compensator (SVC) and STATic synchronous COMpensator (STATCOM) is investigated for wind farm integration. The effect of fault location and its duration time is studied for different fault types. Simulation test cases using MATLAB-Simulink are implemented on a 9 MW wind farm exports power to 120 KV grid. The simulation results show the influence of fault location and its duration on active power, reactive power, and bus voltage of the wind farm

کلیدواژه ها:

Flexible AC Transmission System ، STATCOM ، SVC ، Transient stability ، Wind farm