Enhancement Of Fault Ride Through Capability Of Fsig Based Wind Farm Using Mechanically Switched Shunt Capacitors

Prashanth.N.A, K.S.R.Anjaneyulu, R.S.Shivakumara Aradhya::Fault Ride through capability in FSIG based Wind Farm is essential to preserve voltage stability. This paper investigates the significance of short circuit levels of the grid on the fault ride through capability of the wind farm equipped with Fixed Speed Induction Generators. The minimum short circuit level of the grid required for uninterrupted operation of FSIG based wind farm during three phase fault is determined. Inadequate VAR support or reactive power support could result in low voltage levels and ultimately instability of the wind power systems. A balanced three phase fault is simulated at WT3 in MATLAB/Simulink with Mechanically switched shunt capacitors and without Mechanically switched shunt capacitors at the 33kV bus for different short circuit levels of the grid. The results shows that with Mechanically Switched Capacitors, fault ride through capability of the FSIG based wind farm increases and also improves the transient voltage stability therefore helps the wind farm to remain in service during faults. The results also show that the three phase grid faults closer to PCC are more severe compared to other types of faults like Line to Ground Fault(LG) and Double-Line to Ground fault(LLG).

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