Investigations of large-scale voltage-dependent loads for damping inter-area oscillations: Mechanism and robust decentralized control

Chen Zhang, Deping Ke, Yuanzhang Sun, C. Y. Chung, Jian Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

To uncover the mechanism by which voltage-dependent loads (VDLs) influence electromechanical dynamics, this paper mathematically deduces the damping torque induced by VDLs based on a single machine infinite bus system. Moreover, by continuously regulating the terminal voltage of a typical large-scale VDL, i.e., the aluminum electrolysis load, this paper proposes a novel load damping control architecture to dynamically modulate the power consumption of controlled loads so as to eliminate interarea oscillations in power systems. Specifically, the decentralized load damping controllers (LDCs) used in this architecture are designed by a proposed multistage mixed H2/H control approach to guarantee robustness against uncertainties (e.g., tie-line outages and wind generation fluctuations) as well as to ensure reasonable control efforts of controlled VDLs. Simulation results on the modified New England and New York interconnected system validate the method for analysis of VDLs' effects on interarea oscillations and show the proposed load damping control strategy can satisfactorily damp interarea oscillations over multiple operating points.

Original languageEnglish
Article number8409290
Pages (from-to)6037-6048
Number of pages12
JournalIEEE Transactions on Power Systems
Volume33
Issue number6
DOIs
Publication statusPublished - Nov 2018
Externally publishedYes

Keywords

  • inter-area oscillations
  • Large-scale voltage-dependent load
  • load damping control
  • robust decentralized control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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