Conic-sector-based analysis and control synthesis for linear parameter varying systems

S. Sivaranjani, James Richard Forbes, Peter J Seiler Jr, Vijay Gupta

Research output: Contribution to journalArticle

Abstract

We present a conic sector theorem for linear parameter varying (LPV) systems in which the traditional definition of conicity is violated for certain values of the parameter. We show that such LPV systems can be defined to be conic in an average sense if the parameter trajectories are restricted so that the system operates with such values of the parameter sufficiently rarely. We then show that such an average definition of conicity is useful in analyzing the stability of the system when it is connected in feedback with a conic system with appropriate conic properties. This can be regarded as an extension of the classical conic sector theorem. Based on this modified conic sector theorem, we design conic controllers that allow the closedloop system to operate in nonconic parameter regions for brief periods of time. Due to this extra degree of freedom, these controllers lead to less conservative performance than traditional designs, in which the controller parameters are chosen based on the largest cone that the plant dynamics are contained in. We demonstrate the effectiveness of the proposed design in stabilizing a power grid with very high penetration of renewable energy while minimizing power transmission losses.

Original languageEnglish (US)
Pages (from-to)224-229
Number of pages6
JournalIEEE Control Systems Letters
Volume2
Issue number2
DOIs
StatePublished - Apr 1 2018

Fingerprint

Linear Parameter-varying Systems
Sector
Synthesis
Controllers
Power transmission
Cones
Controller
Trajectories
Feedback
Theorem
Renewable Energy
Period of time
Penetration
Closed-loop System
Cone
Degree of freedom
Trajectory
Grid

Keywords

  • Linear parameter-varying systems
  • Power systems
  • Time-varying systems

Cite this

Conic-sector-based analysis and control synthesis for linear parameter varying systems. / Sivaranjani, S.; Forbes, James Richard; Seiler Jr, Peter J; Gupta, Vijay.

In: IEEE Control Systems Letters, Vol. 2, No. 2, 01.04.2018, p. 224-229.

Research output: Contribution to journalArticle

Sivaranjani, S. ; Forbes, James Richard ; Seiler Jr, Peter J ; Gupta, Vijay. / Conic-sector-based analysis and control synthesis for linear parameter varying systems. In: IEEE Control Systems Letters. 2018 ; Vol. 2, No. 2. pp. 224-229.
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