Inertia Emulation Uncorrelated with Electromechanical Dynamics to Improve Frequency Transients Using Center of Inertia (COI) Frequency Signal

Deping Ke, C. Y. Chung, Jian Xu, Yangwu Shen, Yuanzhang Sun

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

This paper proposes an inertia emulation method that uses the frequency of the center of inertia (COI) as the feedback signal, aiming to slow the frequency change rate and raise the frequency nadir during frequency-dropping events. An approximated model depicting the COI frequency dynamics is first introduced, which shows the COI frequency signal has low observabilities of electromechanical modes. Thus, this feature enables the proposed inertia emulation to react quickly to steep frequency changes without suffering any adverse impacts caused by electromechanical dynamics, such as excessively saturating the controlled objects. Moreover, the electromechanical dynamics associated with small-signal stability properties will not be interrupted by the proposed inertia emulation. In addition, a simple yet effective computing procedure is proposed to configure the critical parameters, as the inertia emulation is implemented with multiple flywheel-based energy storage systems. Simulation results obtained based on two large interconnected systems verify the effectiveness of the proposed inertia emulation in terms of improving the frequency transients as well as its limited correlation with the electromechanical dynamics of the system. The signal transmission latency's impacts on the proposed inertia emulation are also investigated and discussed.

Original languageEnglish
Article number9246307
Pages (from-to)1736-1749
Number of pages14
JournalIEEE Transactions on Power Systems
Volume36
Issue number3
DOIs
Publication statusPublished - May 2021
Externally publishedYes

Keywords

  • Center of inertia (COI)
  • damping
  • electromechanical
  • frequency nadir
  • inertia emulation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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