A MATHEMATICAL MODELLING OF DFIG BASED WIND ENERGY CONVERSION SYSTEM WITH VIRTUAL RESISTANCE

This paper presents the mathematical modelling of DFIG based on load convention and explains the reduction of fault current in the rotor windings. The reduction of fault current is done by using virtual resistance control in which enhanced approach towards Fault Ride Through (FRT) controller is made. The enhanced FRT approach overcomes the usage of the conventional crowbar technique and uses a virtual resistance, where it meets the new grid code requirements during grid faults. Hence the whole system is always connected to the grid during abnormal conditions. The simulations are carried out in MATLAB /SIMULINK and the results are compared with those of the conventional crowbar method.