Fault current contribution from synchronous machine and inverter based distributed generators

Nattaphob Nimpitiwan, Gerald Thomas Heydt, Raja Ayyanar, Siddharth Suryanarayanan

Research output: Contribution to journalArticlepeer-review

267 Scopus citations


There are advantages of installing distributed generation (DG) in distribution systems: for example, improving reliability, mitigating voltage sags, unloading subtransmission and transmission system, and sometimes utilizing renewables. All of these factors have resulted in an increase in the use of DGs. However, the increase of fault currents in power systems is a consequence of the appearance of new generation sources. Some operating and planning limitations may be imposed by the resulting fault currents. This paper discusses a model of inverter based DGs which can be used to analyze the dynamic performance of power systems in the presence of DGs. In a style similar to protective relaying analysis, three-dimensional plots are used to depict the behavior of system reactance (X) and resistance (R) versus time. These plots depict operating parameters in relation to zones of protection, and this information is useful for the coordination of protection systems in the presence of DG.

Original languageEnglish (US)
Pages (from-to)634-641
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number1
StatePublished - Jan 2007


  • Distributed/dispersed generation
  • Fault calculation
  • Inverters
  • Power distribution
  • Power system protection

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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