Detection method of the DC bias in distribution power transformers

Giampaolo Buticchi, Emilio Lorenzani

Research output: Journal PublicationArticlepeer-review

46 Citations (Scopus)


Nonlinear loads such as ac drives, switch-mode power supplies and grid-connected converters can cause, in addition to the generation of unwanted current harmonics, a dc current component injection into the grid. This dc current component can lead to magnetic saturation of the distribution power transformers, leading to higher current distortion and overheating. This paper presents a method to detect the dc current component flowing into the distribution power transformer with a precise measurement of the dc voltage component at the transformer winding. A magnetic sensor has been developed and implemented in a closed-loop control system to achieve a high sensitivity and guarantees a good linearity with a high rejection ratio to grid voltage variations. Simulation and experimental results confirm the effectiveness of the proposed approach.

Original languageEnglish
Article number6420937
Pages (from-to)3539-3549
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number8
Publication statusPublished - 2013
Externally publishedYes


  • Active filters
  • distributed power
  • grid-connected converters
  • nonlinear magnetics
  • nonlinear systems
  • power conversion
  • power system measurements
  • power transformers
  • voltage measurement

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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