This IEEE Topic on Superconducting Fault Current Limiter discuss about use working of SFCL. With the increase of electricity demand and change of concerning environment, the capabilities of renewable energy generation systems are being expanded.Renewable energy sources considered as clean and prospective energy sources of the future world. 12% of world’s electricity is generated from wind power. The wind-turbine generation system (WTGs) is a representative renewable energy system.
- Does not cause pollution problem.
- Lowest maintenance cost.
WTGs increases the level of short-circuit current during a fault in a distribution system.
A high temperature superconducting fault current limiter (SFCL) can be solution to reduce the level of short-circuit current during fault.
Why Superconducting Fault Current Limiter (SFCL)?
- Reduces the peak value of fault current.
- Improves the transient stability of the power system.
- Provides the system effective damping for low-frequency oscillations.
- Causes no power loss in steady-state condition.
Connection of SFCL to an electric power grid:
- Optimal place to install the SFCL.
- Optimal resistive value of the SFCL occurred in series with a transmission line during a short circuit fault.
- Potential protection-coordination problem with other existing protective devices such as circuit breakers.
Modelling Of SFCL
Modelling of a resistive (non-inductive winding) SFCL consists of:
- Stabilizer resistance of the n'Th unit, Rns.
- Superconductor resistance of the n'Th unit, Rnc(t) connected with Rns in parallel.
- Coil inductance of the n'Th unit, Ln.
- Fixed speed wind generator
- Variable speed wind generator
DFIG generator model is a built in model which integrates the induction machine and rotor-side converter (RSC). DFIG and RSC modelled in rotor reference frame (RRF) rotating at generator speed. RSC controller operates in a stator flux oriented reference frame (SFRF) rotating at synchronous speed. RSC control modifies the active (P) and reactive(Q) power by regulating the q and d axis rotor currents.