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Impact of voltage phase angle changes on low-voltage ride-through performance of small scale hydro DG units

Abstract

Computer simulations of a simplified radial 132, 66 and 22 kV system including a 5 MVA hydro power unit, has been performed in order to assess the hydro unit's fault-ride-through (FRT) capability, with special emphasis on the Critical Clearing Time (CCT) of the unit. The results show that there is a significant difference in CCT when the disturbance reflects a realistic fault in the system, i.e. a fault that reflects changes in both voltage magnitude and phase angle, compared with a disturbance for which only the change in voltage magnitude is taken into account. Since requirements regarding fault-ride-through (FRT) capability found in most of today's national grid codes are defined via a specified transient voltage vs. time disturbance profile, the paper therefore suggests that these requirements should be extended to include also corresponding phase angle vs. time disturbance profiles

Category

Academic chapter

Language

English

Author(s)

  • Trond Toftevaag
  • Traian Nicolae Preda
  • Kjetil Uhlen

Affiliation

  • SINTEF Energy Research / Energisystemer
  • Norwegian University of Science and Technology

Year

2013

Publisher

CIRED - Congrès International des Réseaux Electriques de Distribution

Book

CIRED 2013 Electricity Distribution Systems for a Sustainable Future

ISBN

9781849197328

View this publication at Norwegian Research Information Repository