Fault Ride Through Capability Improvement of DFIG Based Wind Farms Using Active Power Controlled Bridge Type Fault Current Limiter

Doubly fed induction generators (DFIGs) provide some intriguing features which made them one of the most popular choices in power system. However, since the stator windings of a DFIG are attached to the grid, they are severely affected by faults. To comply with the grid code, a DFIG must stay connected to the grid during faults for a stable operation of the power system. Hence, the requirement of fault ride through (FRT) capability improvement is mandatory for every DFIG based wind farms. Bridge type fault current limiters (BFCLs) are one of the newest additions to solve the issues with FRT capability. There are several existing schemes to control a BFCL. However, no attempt had been taken to use the active power of the DFIG for controlling the BFCL. In this paper, a new control scheme using the active power of the system is proposed. Later, the system responses for different control schemes have been compared. Simulations have been carried out in Matlab/Simulink environment. It has been found that, the proposed control of BFCL using active power provides better FRT capability improvement than other existing schemes.