PMU-Based Detection of Voltage Imbalances with Tolerance Constraints

Tirza Routtenberg, Ricky Concepcion, Lang Tong

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The problem of voltage imbalance detection in a three-phase power system using phasor measurement unit (PMU) data is considered within a hypothesis testing framework. A general model for the PMU output with a downsampled negative sequence is presented. The new formulation takes into account computation complexity and tolerance of imbalance. A new monitoring tool, referred to as a generalized locally most powerful (GLMP) test, is proposed for detection in the presence of nuisance parameters. A closed-form expression of the GLMP test is developed for the detection of an imbalance problem, based on a single PMU's measurements. Numerical simulations show improved performance over benchmark techniques.

Original languageEnglish
Article number7513442
Pages (from-to)484-494
Number of pages11
JournalIEEE Transactions on Power Delivery
Issue number1
StatePublished - 1 Feb 2017


  • Phasor measurement unit (PMU)
  • generalized locally most powerful (GLMP) test
  • microgrids
  • off-nominal frequencies
  • power system monitoring
  • state estimation
  • symmetrical components
  • unbalanced power system

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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