Online Detection of High-Resistance Connections With Negative-Sequence Regulators in Three-Phase Induction Motor Drives

Michele Mengoni, Luca Zarri, Yasser Gritli, Angelo Tani, Fiorenzo Filippetti, Sang Bin Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)


High-resistance connections in electric drives can cause localized overheating and motor supply voltage unbalance, which degrade the performance, efficiency, and reliability of the system. An enhanced field-oriented control scheme for induction machines that is capable of detecting resistive unbalance due to high-resistance connections, and regulating the negative-sequence current is proposed as the main contribution of this paper. Resistive unbalance is detected and located while maintaining the symmetric drive behavior both under transient and steady-state operating conditions. The negative-sequence regulator adopted in addition to the traditional current regulator for rotor field-oriented control is used to compensate for the voltage unbalance caused by the inherent asymmetries in the cable and stator winding and by the poor contacts. A model that shows the relationship between the resistive unbalance and negative-sequence current components is derived from the analysis of the proposed scheme. The theoretical analysis and the validity of the detection technique are confirmed with an experimental study on a 4-kW induction motor drive.

Original languageEnglish
Article number6914615
Pages (from-to)1579-1586
Number of pages8
JournalIEEE Transactions on Industry Applications
Issue number2
Publication statusPublished - 2015 Mar 1



  • fault detection
  • faulttolerant drive
  • High-resistance connections
  • induction motor drive

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this