Research on influence of DFIG wind farm access on power grid voltage stability

The proportion of wind power generation in the power system is increasing year by year. Due to the intermittency, randomness, and uncontrollability of wind energy, the impact of wind power grid connection on the normal, safe, stable operation, and voltage stability of the power system is gradually becoming apparent. Therefore, it is of great significance to study the impact of wind power grid connection on system voltage stability.In this thesis, the EPRI-36 node connected to the wind farm is simulated, and the voltage stability of the system is analyzed by PV curve, sensitivity analysis method and active power margin index. The results show that the dismantling of wind farm will weaken the voltage stability of the original system, resulting in lower voltage amplitude, increased sensitivity and lower active power margin of the system load node,The degree of its impact is related to the output of the wind farm and the size of the load at the connecting nodes. The smaller the power change of the wind farm, the lower the load at the connecting node, and the weaker the influence on the voltage stability of the system.