Fault Ride-Through study of PMSG based offshore wind farms during grid faults

Abstract

As the wind power penetration continues to increase in the modern day electrification, the stabilized operation of wind farms interconnected with grids pose an alarming situation. Typically for an asymmetric grid fault, whose probability of occurrence is more than 70%, the voltage and VAR profile of the wind farm gets disturbed thus leading to erroneous operation of wind energy conversion system. LVRT (Low Voltage Ride-Through) requirements for the wind energy conversion systems typically for an offshore based grid interconnection are still under discussion. This paper presents a FACT device based LVRT capability, where the FACT device injects 1pu reactive current in the grid during asymmetric faults as well as symmetric three phase faults.