Networked detection of voltage imbalances for three-phase power systems

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations


The problem of imbalance detection in a three-phase power network using a phasor measurement unit (PMU) is considered. In this paper, a general model for the positive sequences is presented based on time-domain PMU measurement at off-nominal frequencies. Then, the detection problem at the control center is formulated as a composite multihypothesis testing framework, in which the goal is to identify the unbalanced buses in the power network. A method for unbalanced bus identification is developed based on the minimum description length (MDL) model selection criterion. In addition to determining the unbalanced buses, the algorithm also provides an estimation of the off-nominal frequency and the system states. In contrast to the existing imbalance detection techniques, the proposed method is based solely on the single-phase positive sequence data, without the negative or zero sequences. Thus, it can be carried out at the control center without additional communication and processing costs. In addition, the novel networked MDL-based approach takes advantage of all the information from different buses in the network. The use of the networked information is expected to yield a lower probability of error compared to existing local bus-level detection approaches. Numerical performance analysis shows the applicability of the proposed networked MDL method for imbalance detection in a two-port π-model.

Original languageEnglish
Title of host publicationProceedings - 2015 IEEE 24th International Symposium on Industrial Electronics, ISIE 2015
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781467375542
StatePublished - 28 Sep 2015
Event24th IEEE International Symposium on Industrial Electronics, ISIE 2015 - Buzios, Rio de Janeiro, Brazil
Duration: 3 Jun 20155 Jun 2015

Publication series

NameIEEE International Symposium on Industrial Electronics


Conference24th IEEE International Symposium on Industrial Electronics, ISIE 2015
CityBuzios, Rio de Janeiro


  • Phasor measurement unit (PMU)
  • minimum description length (MDL)
  • networked identification of imbalances
  • smart grid
  • unbalanced power system

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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