A New Approach for Low Voltage Ride Through Enhancement in Grid-Connected Wind Farms

Abstract

In this paper, an inductive SFCL is proposed and designed to achieve the LVRT requirement of WECSs. Hence, this study represents a new SFCL-based protection scheme for wind farms including DFIG and PMSG systems. The accurate model of inductive SFCL with state transition based on value and duration of fault current is presented for simulation in MATLAB/SIMULINK software. The main objectives of using this proposed scheme are limiting and damping the peak values of the DC-link voltage, rotor current, stator current and electromagnetic torque oscillation of WECSs when a fault occurs. Also, after the fault clearance, the proposed scheme can provide transient recovery process smoothly. To evaluate the effectiveness and performance of the proposed scheme, 6-MW DFIG system and 8-MW PMSG system are considered as a large-scale wind farm. The performance evaluations and comparisons demonstrate the superiority of the proposed scheme in improving the LVRT capabilities of WECSs.