A new approach to continuous latency compensation with adaptive phasor power oscillation damping controller (POD)

Nilanjan Ray Chaudhuri, Swakshar Ray, Rajat Majumder, Balarko Chaudhuri

Research output: Contribution to journalArticle

78 Scopus citations


Latency or delay in remote feedback signals can adversely affect the closed-loop damping performance. Accurate time-stamp information at both (PMU location and control center) ends offers a possibility to continuously compensate for time-varying latency. In this paper, an adaptive phasor power oscillation damping controller (APPOD) is proposed wherein the rotating coordinates for phasor extraction are adjusted to account for the change in phase caused due to the delay. The oscillatory component of the original signal is thus retrieved out of the delayed signal received at the control center. Unlike conventional phasor POD, which uses a fixed phase shift to generate damping control signal, an adaptive phase shift algorithm is used here to suit varying signal locations and operating conditions. Case studies confirm the effectiveness of the proposed technique, both in terms of robustness and handling continuously varying delays. A comparison with a conventional gain scheduled POD (CGPOD) and a Unified Smith Predictor (USP) approach is also presented.

Original languageEnglish (US)
Article number5332251
Pages (from-to)939-946
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - May 1 2010


All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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