Current Reference Generation based on Next Generation Grid Code Requirements of Grid-Tied Converters during Asymmetrical Faults

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Abstract

Increased penetration of converter-based power generation has enforced system operators to require ancillary services from distributed generation in order to support the grid and improve the power system stability and reliability. Recent and next generation of grid codes require asymmetrical current provision during unbalanced faults for optimal voltage support. To address this, based on the highly used flexible positive and negative-sequence control method for current reference generation, this paper presents a general current reference strategy for asymmetrical fault control where a direct and explicit method is proposed to calculate power references and controller gains while simultaneously complying with converter current limitation and fulfilling the next generation of grid code requirements. The proposed method is tested for three distinct asymmetrical grid faults considering the requirements for dynamic voltage support of the recently revised German grid code as well as the next-generation grid codes. It is shown that the proposed method can improve the fault ride-through performance during asymmetrical faults compared to conventional solutions and comply with modern grid code requirements in a general and flexible manner.
Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Number of pages14
ISSN2168-6777
DOIs
Publication statusE-pub ahead of print - 2020

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Keywords

  • Grid-Connection
  • Voltage-Source Converter
  • Asymmetrical Grid Fault
  • Current Reference Generation
  • Fault Ride-Through
  • Dynamic Voltage Support

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