A Sparse Representation Approach to Online Estimation of Power System Distribution Factors

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Abstract

In this paper, we propose a method to compute linear sensitivity distribution factors (DFs) in near real time without relying on a power flow model of the system. Specifically, we compute the injection shift factors (ISFs) of a particular line of interest with respect to active power injections at all buses (all other DFs can be determined from ISFs). The proposed ISF estimation method relies on the solution of an underdetermined system of linear equations that arise from high-frequency synchronized measurements obtained from phasor measurement units. We exploit a sparse representation (i.e., one in which many elements are zero) of the vector of desired ISFs via rearrangement by electrical distance and an appropriately chosen linear transformation, and cast the estimation problem into a sparse vector recovery problem. As we illustrate through case studies, the proposed approach provides accurate DF estimates with fewer sets of synchronized measurements than earlier approaches that rely on the solution of an overdetermined system of equations via the least-squares errors estimation method.

Original languageEnglish (US)
Article number6914625
Pages (from-to)1727-1738
Number of pages12
JournalIEEE Transactions on Power Systems
Volume30
Issue number4
DOIs
StatePublished - Jul 1 2015

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Keywords

  • Compressive sensing
  • distribution factors
  • phasor measurement units (PMUs)
  • power system monitoring
  • sensitivity

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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