Enhancement of low‐voltage ride through of wind energy conversion system using superconducting saturated core fault current limiter

Abstract

Summary For enhancing the fault ride through (FRT) capability of doubly fed induction generator (DFIG), the major concern is to remain connected with the grid for maintaining the grid code. For improving this entity, saturated core fault current limiter (SCFCL)‐based protection system has been used in the DFIG system for protecting it from the fault current during fault conditions. The main features of transformer‐type three‐limb SCFCL is that the Alternating Current (AC) coils embedded across the two limbs, and the Direct Current (DC) coils embedded across the other remaining limb. The main features of SCFCL is that the core is saturated during normal operating condition, and during the fault condition, high current generates sufficient magnetic flux in the AC coil, which drives each core out of the saturation. Because of this, SCFCL operates in high‐permeability zone and increases the impedance of the AC coil, which limits the fault current. In this paper, the above behaviour of SCFCL under normal and faulty condition has been analysed by simulated mathematical modelling and verifying it with the experimental setup. In addition to conserve good FRT performance, the fault consequences in DFIG system such as rotor current, DC link voltage, and torque fluctuations are analysed. Also, the simulation result justifies the efficacy of SCFCL compared with the other conventional schemes.

Effectiveness evaluation of passive resistive element placement on a fault ride‐through enhancement in a DFIG‐based wind energy conversion system

“…Generator diagram of doubly fed induction generators (DFIG)‐based wind energy conversion systems (WECS) in the stator reference frame…”

Multi-resistor BFCL for FRT capability improvement of DFIG-based wind farm

“…Since the capacity of RSC is 25–30% of the DFIG power rated, it cannot produce enough rotor voltage to counteract the stator voltage drop during severe voltage sag and needs the hardware protection scheme to cope with this problem [11 ]. In literature, several hardware schemes have been proposed and documented to meet the FRT requirement of the DFIG, which can be classified as (i) parallel reactive power compensation controllers include static synchronous compensator and static var compensator [12 ], (ii) dynamic voltage restorer [13 ], (iii) unified inter‐phase power controller [14, 15 ], (iv) series dynamic resistor [16, 17 ], (v) energy storage system [18 ], (vi) fault current limiters (FCLs) [19–41 ]. FCLs have been recognised as an attractive protection device in power system, which not only limits the magnitude of fault current [19–25 ], but also improves the power quality [26–28 ], the transient recovery voltage of circuit breaker [29, 30 ], and the system stability [31 ].…”

“…In [32–34 ], FCL has been introduced as a promising protection device for integration the downstream microgrids to the main AC grid. Recently, the application of FCLs is receiving more attention to cope with the FRT performance and fault current increment problems in WFs [35–41 ]. In [35 ], the application of resistive‐type superconducting FCLs (SFCLs) has been proposed for limiting fault current and enhancing the FRT capability of DFIG.…”

Improved Adaptive Robust Control for Low Voltage Ride-Through of Front-End Speed Regulation Wind Turbine

“…To improve the reliability of the power system, the wind turbine should remain connected to the grid during the grid voltage dip. In other words, the wind turbine connected to the power grid must have low voltage ride-through (LVRT) capability [9]- [12].…”