Instability of Wind Turbine Converters during Current Injection to Low Voltage Grid Faults and PLL Frequency Based Stability Solution

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135 Citations (Scopus)

Abstract

In recent grid codes for wind power integration, wind turbines are required to stay connected during grid faults even when the grid voltage drops down to zero; and also to inject reactive current in proportion to the voltage drop. However, a physical fact, instability of grid-connected converters during current injection to very low (close to zero) voltage faults, has been omitted, i.e., failed to be noticed in the previous wind power studies and grid code revisions. In this paper, the instability of grid side converters of wind turbines defined as loss of synchronism (LOS), where the wind turbines lose synchronism with the grid fundamental frequency (e.g., 50 Hz) during very deep voltage sags, is explored with its theory, analyzed and a novel stability solution based on PLL frequency is proposed; and both are verified with power system simulations and by experiments on a grid-connected converter setup.
Original languageEnglish
JournalI E E E Transactions on Power Systems
Volume29
Issue number4
Pages (from-to)1683-1691
Number of pages9
ISSN0885-8950
DOIs
Publication statusPublished - 9 Jan 2014

Keywords

  • Converters
  • Current control
  • Power system faults
  • Power system stability
  • Wind power generation

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