Mitigation of Geomagnetically Induced Currents by Neutral Switching

Baris Kovan, Francisco De Leon

Research output: Contribution to journalArticlepeer-review


This paper presents a novel mitigation technique to reduce the effects of geomagnetically induced currents (GICs) on high-voltage power systems. The method consists of connecting switching devices at the neutral grounding connection point of transformer banks. Only one transformer bank needs to be grounded through a switch to reduce GIC in a two-terminal system. For multiterminal systems, n-1 switches are necessary and the operation is independent from each other. The switching frequency and the duty cycle are selected from a tradeoff between the effectiveness of the method and the detection of fault currents. Transient simulations on a two-bus 230/500 kV system show that the proposed switching at the neutral successfully mitigates the GIC. This proposed technique opens the door to a new family of GIC mitigation methods.

Original languageEnglish (US)
Article number7111318
Pages (from-to)1999-2006
Number of pages8
JournalIEEE Transactions on Power Delivery
Issue number4
StatePublished - Aug 1 2015


  • Geomagnetic disturbance (GMD)
  • geomagnetically induced current (GIC)
  • geomagnetism
  • half-cycle saturation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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