Stabilization of wind farms connected with multi-machine power system by using STATCOM/BESS

In this paper, the stabilization of wind farms connected with multi-machine power system in which a severe network disturbance occurs is analyzed. For this purpose, the STATCOM incorporated with battery energy storage system (BESS), i.e., STATCOM/BESS topology is proposed to enhance the transient stability of entire power system. At each wind farm terminal one PWM based STATCOM/BESS is connected. Two-mass drive train model of wind turbine generator system (WTGS) is used in the analyses as the drive train modeling has great impact on the dynamic characteristics of fixed speed wind generator. Both of symmetrical and unsymmetrical faults are considered as network disturbances. Simulation results clearly show that the proposed STATCOM/BESS can enhance the transient stability of wind generators in multi-machine power system. Moreover, it can also enhance the low voltage ride through (LVRT) capability of WTGS.