Simulation Research on LVRT Capability of DFIG-based WECS During Severe Grid Voltage Sags

Abstract

The low voltage ride through (LVRT) means that wind turbines must connect to grids under grid-side faults. This paper provides a simulation study on the LVRT capability of wind energy conversation systems (WECS) under doubly-fed induction generator (DFIG) during severe grid side voltage sags. Flexible AC Transmission (FACTS) devices such as static synchronous compensator (STATCOM) is an option available to provide controlled dynamic reactive power to improve the voltage sags. Moreover, this system is modeled and simulated in MATLAB. The simulation result shows that STATCOM is more effective to enable the DFIG to ride through the severe faults.