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Cooperative Control Strategy for Low-Voltage Ride-Through of DFIGM Based on an Improved IGBT-Based Active Crowbar.

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Summary

This study introduces a cooperative control strategy for doubly fed induction generator-motor (DFIGM) systems to improve low-voltage fault ride-through (LVRT) performance. The method enhances grid stability by optimizing current control and utilizing an active crowbar for reactive power support.

Keywords:
current reversely tracking control (CRTC)doubly fed induction generator-motor (DFIGM)improved active crowbarlow-voltage ride-through (LVRT)

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Control Systems

Background:

  • Doubly fed induction generator-motor (DFIGM) systems face challenges with low-voltage faults, impacting grid stability.
  • Existing control strategies often lack practical implementation or sufficient reactive power support during grid disturbances.
  • Low-voltage ride-through (LVRT) is critical for DFIGM integration into power grids.

Purpose of the Study:

  • To propose a practical cooperative control strategy for DFIGM systems to enhance LVRT capability.
  • To integrate an improved current reversely tracking control (CRTC) with an enhanced IGBT-based active crowbar.
  • To optimize DFIGM performance under rotor voltage and current constraints during low-voltage faults.

Main Methods:

  • Developed an improved current reversely tracking control (CRTC) scheme.
  • Implemented an enhanced IGBT-based active crowbar topology for reactive power support.
  • Optimized current-tracking coefficients considering rotor voltage and current constraints during LVRT.
  • Conducted comparative studies using a 10-MW DFIGM model against conventional inductance emulating control (IEC) and a standard crowbar structure.

Main Results:

  • The proposed cooperative control strategy effectively suppresses negative-sequence current components.
  • Enhanced active crowbar provides crucial reactive power support, mitigating harmonic distortion.
  • Power quality at the point of common coupling (PCC) is significantly improved.
  • Experimental validation confirmed the feasibility and effectiveness of the proposed method over conventional approaches.

Conclusions:

  • The integrated CRTC and enhanced active crowbar strategy offers a practical solution for DFIGM LVRT issues.
  • The method demonstrates superior performance in maintaining grid stability and power quality during voltage faults.
  • This approach contributes to the reliable integration of DFIGMs into modern power grids.