Performance of Wind Energy Conversion System during Symmetrical fault & Power Quality Improvement of Grid-Connected WECS by UPFC

The demand for the power generation from wind is constantly growing. This situation forces the revision of the grid codes requirements, to remain connected during grid faults. Immediately the voltage level will drop below 80% when fault occurs at PCC (Point of Common Coupling) and the rotor speed of IG (Induction Generators) becomes unstable. In this work, UPFC are used under fault condition to improve the LVRT (Low Voltage Ride-Through) of WECS (wind energy conversion system) and damping of rotor speed oscillations of IG. Furthermore, after the fault UPFC act as virtual inductor, leads to increase in terminal voltage of WECS. WECS with DFIG-based system is considered for analysis here. By simulating DFIG-based WECS with UPFC indicates the improvement in LVRT & remains and WTGs continues to operate with grid at certain voltage fluctuations, near grid. Also, indicates voltage improvement at PCC under fault conduction, and voltage is recovered easily to 1pu at PCC.