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<p>Enhancing low voltage ride through (LVRT) is crucial for the dynamic performance of doubly fed induction generator (DFIG) based wind energy conversion systems (WECS) under severe conditions, thereby bolstering the resilience of power grids heavily reliant on renewable energy sources. Maintaining the DC-link voltage, stator and rotor currents, and rotor speed within the maximum permissible limits during LVRT, is essential to comply with grid codes. In this paper, an optimally designed inductive solid state fault current limiter (SSFCL), connected on the stator side, coupled with an optimally tuned supercapacitor-based energy storage system (SC-ESS), connected across the DC-link, is proposed to enhance the LVRT capability of a DFIG-based WECS. This approach aims to minimize the peak overshoot of the stator current, rotor current, DC-link voltage, and rotor speed during an 85% voltage dip at the grid terminal, thereby improving system resilience. An objective function is formulated to minimize the DC-link voltage deviation and SC-ESS rating in order to optimally design the SSFCL during LVRT. To meet the reactive power support standards as per grid codes during LVRT, reactive power is injected from both the rotor-side and grid-side converters. The injection of reactive power supports the grid during the fault and aids in fast voltage recovery after fault clearance. The proposed method is also compared with the hybridization of rotor crowbar and braking chopper (HRCBC) method, non-controlled fault current limiter (NCFCL) and nonlinear DC-link voltage (NCDC) control method for LVRT enhancement Simulation results demonstrate that the proposed method exhibits the least peak overshoots in the DC-link voltage, stator current, rotor current, and rotor speed during LVRT scenarios compared to the other methods. The SC-ESS proposed in the present work exhibits higher power density and faster transient performance, which helps in rapidly mitigating the power imbalance during LVRT. This leads to reduced overshoots in the DC-link voltage and rotor speed. A fast transient response with reduced DC-link voltage overshoot results in lower rotor voltage and rotor flux, which in turn limits the stator flux and stator current. Combined with the SSFCL, this effectively restricts the stator and rotor currents to permissible values.</p>

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A coordinated control strategy with solid state fault current limiter and supercapacitor energy storage system for enhancing LVRT capability of DFIG-based wind energy conversion system

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Atanu Ghosh,
  • B. Kalyan Kumar

摘要

Enhancing low voltage ride through (LVRT) is crucial for the dynamic performance of doubly fed induction generator (DFIG) based wind energy conversion systems (WECS) under severe conditions, thereby bolstering the resilience of power grids heavily reliant on renewable energy sources. Maintaining the DC-link voltage, stator and rotor currents, and rotor speed within the maximum permissible limits during LVRT, is essential to comply with grid codes. In this paper, an optimally designed inductive solid state fault current limiter (SSFCL), connected on the stator side, coupled with an optimally tuned supercapacitor-based energy storage system (SC-ESS), connected across the DC-link, is proposed to enhance the LVRT capability of a DFIG-based WECS. This approach aims to minimize the peak overshoot of the stator current, rotor current, DC-link voltage, and rotor speed during an 85% voltage dip at the grid terminal, thereby improving system resilience. An objective function is formulated to minimize the DC-link voltage deviation and SC-ESS rating in order to optimally design the SSFCL during LVRT. To meet the reactive power support standards as per grid codes during LVRT, reactive power is injected from both the rotor-side and grid-side converters. The injection of reactive power supports the grid during the fault and aids in fast voltage recovery after fault clearance. The proposed method is also compared with the hybridization of rotor crowbar and braking chopper (HRCBC) method, non-controlled fault current limiter (NCFCL) and nonlinear DC-link voltage (NCDC) control method for LVRT enhancement Simulation results demonstrate that the proposed method exhibits the least peak overshoots in the DC-link voltage, stator current, rotor current, and rotor speed during LVRT scenarios compared to the other methods. The SC-ESS proposed in the present work exhibits higher power density and faster transient performance, which helps in rapidly mitigating the power imbalance during LVRT. This leads to reduced overshoots in the DC-link voltage and rotor speed. A fast transient response with reduced DC-link voltage overshoot results in lower rotor voltage and rotor flux, which in turn limits the stator flux and stator current. Combined with the SSFCL, this effectively restricts the stator and rotor currents to permissible values.