A criterion for reverse control action of TCUL controls and their deactivation timings

Naoto Yorino, Tsutomu Fujimura, Hiroshi Sasaki, Hiroaki Sugihara, Yosuke Nakanishi

Research output: Contribution to journalArticle

Abstract

The dynamic behaviors of the TCUL controls are investigated from the viewpoint of the effect of control actions on voltage stability as well as on voltage regulations, taking into account the interference among the multiple control actions of TCULS. The Liapunov stability theorem is applied to a system having nonlinear voltagedependent loads to derive conditions for stability. We define the term "reverse control action for multiple TCULS" to indicate undesirable tap operations, where multiple controls as a whole cause the decrease in voltages of specific nodes, leading to voltage collapse, in spite of normal individual operations. A criterion to detect the phenomena is derived and then a new control strategy based on this criterion is demonstrated. In this demonstration, unsuitably acting TCULs are individually deactivated at their most effective timings to improve voltage stability. The effectiveness of the proposed criterion and its application to the deactivation control have successfully been confirmed through numerical simulations in a radial network with three cascaded TCUL transformers, where a specific area of a real system is reduced to form the example system.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Volume124
Issue number4
DOIs
Publication statusPublished - 1998
Externally publishedYes

Keywords

  • Reverse control action of tap changers
  • Tap-change-under- Load (TCUL) transformer
  • Voltage collapse
  • Voltage control
  • Voltage stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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