Analysis of Transient Voltage Stability of Wind Power Accessing Jiangxi Power Grid

Abstract

With the rapid development of wind power, the scale and single-unit capacity of wind farms are getting larger and larger, and the impact of wind power access on the grid cannot be ignored, especially the impact on the voltage stability of the power grid. This paper takes a doubly-fed generator set as a typical example and analyzes its related wind speed and generator model and control structure. The changes in power flow and transient voltage stability after the wind farm is connected to the power grid are analyzed through the power system simulation software PSASP and the actual Jiangxi Power Grid. The critical clearing time of faults under different output conditions of the wind farm is given. At the same time, the research on the improvement of transient voltage stability of the wind farm based on static var compensator (SVC)is carried out. The analysis results show that the transient stability of the power system after grid-connected wind power is deteriorating as the output of the wind farm increases, the SVC can effectively help the wind turbine recover voltage after a fault in the event of a large-disturbance fault with a three-phase short circuit in the wind power grid, which is of great significance to the stability of regional power grids and the regulation of Jiangxi Power Grids after wind power access.