Improvement in low voltage ride through capability of PMSG based wind energy system

摘要

In this paper, the variable speed wind turbine connected to the ac grid through power converter system consist of two voltage source converters namely, generator side converter and grid side converter and a common dc link. Active and reactive powers of converters were controlled independently by using vector control method to improve low voltage ride through (LVRT) capability of wind energy system. Analysis of the system is performed by using voltage dip as network disturbances and stability of variable speed wind turbine driving PMSG is performed. Simulation result shows that LVRT capability of grid connected wind energy system is achieved during network disturbances for different voltage dip magnitude and duration. Simulation is carried out in MATLAB/Simulink.