Study on voltage sag area and transient stability in power system with wind farm

With the national energy structure adjustment accelerating the development of the scale of large grid-connected wind farm, large-scale and high degree of concentration grid-connected wind farm has a great impact on power adjustment control, power quality, and grid stability. This paper has studied the impact of large-scale and grid-connected wind farm on voltage sag propagation characteristics, voltage sag area and transient stability. The improved RX power flow model is applied to wind turbines and three typical large-scale wind farm models are built based on the IEEE 39 bus standard test system. This paper has also studied the effects of different short circuit faults on voltage sag area and propagation characteristics when the grid incorporates the wind farm. In addition, the system transient stability is simulated and analyzed on wind power, fault location and duration. The rule of the effects on power system transient stability is concluded. A series of improved measures are put forward to solve the above problems. This study provides the basis and reference for the realization of large-scale new energy power safety and efficient utilization.