The impact of LVRT on the transient stability of power system with large scale wind power

Large-scale wind power will affect the transient stability of power system. This paper analyzes the difference of transient stability characteristic of power system with wind power with/without LVRT (low voltage ride through) ability. The power system with wind farm is established in Powerfactory/DIgSILENT based on an actual wind power system. The voltage of DFIG stator with/without LVRT is theoretically compared and it shows that the LVRT could improve the voltage. And then, with different fault point or different output of wind power, comprehensive analysis on how the LVRT ability of wind farm affect the transient ability of power system is presented. Simulation results show that the wind farm with additional LVRT ability could improve the transient stability characteristics of near-end synchronous generator. Furthermore, with the increase of wind power penetration, which engaging the LVRT ability, the transient stability of the near-end synchronous generator is improved.