A Survey on Low-Voltage Ride-Through Techniques For DFIG based Wind Turbines

Abstract

The Doubly-Fed Induction Generator (DFIG) is the most widely used technology in wind turbines worldwide. The reaction to grid voltage disturbances is sensible in case of DFIG systems. Fault ride through (FRT) is an important feature for wind turbine systems to fulfil grid code requirements. This is one of the biggest challenges resulting in a massive deployment of wind farms. During a fault condition, the voltage at the Point of Common Coupling (PCC) drops immediately and the grid voltage reduces (voltage sag) imposed at the connection point of the DFIG to the grid induce large voltages in the rotor windings, resulting in high short circuit current, which can damage the rotor-side converter and disconnect from grid. This paper presents the various techniques to enhance the fault ride through capability of DFIG wind turbine.