Enhancement of transient stability limit and voltage regulation with dynamic loads using robust excitation control

Jahangir Hossain*, Apel Mahmud, Naruttam K. Roy, Hemanshu R. Pota

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In stressed power systems with large induction machine component, there exist undamped electromechanical modes and unstable monotonic voltage modes. This article proposes a sequential design of an excitation controller and a power system stabiliser (PSS) to stabilise the system. The operating region, with induction machines in stressed power systems, is often not captured using a linearisation around an operating point, and to alleviate this situation a robust controller is designed which guarantees stable operation in a large region of operation. A minimax linear quadratic Gaussian design is used for the design of the supplementary control to automatic voltage regulators, and a classical PSS structure is used to damp electromechanical oscillations. The novelty of this work is in proposing a method to capture the unmodelled nonlinear dynamics as uncertainty in the design of the robust controller. Tight bounds on the uncertainty are obtained using this method which enables high-performance controllers. An IEEE benchmark test system has been used to demonstrate the performance of the designed controller.

Original languageEnglish
Pages (from-to)561-570
Number of pages10
JournalInternational Journal of Emerging Electric Power Systems
Volume14
Issue number6
DOIs
Publication statusPublished - 12 Oct 2013
Externally publishedYes

Keywords

  • nonlinearity
  • robust control
  • transient stability
  • uncertainty
  • voltage regulation

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