A novel nonlinear observer-based LQ control system design for wind energy conversion systems with single measurement

Van Phong Vu, Ton Do

Research output: Contribution to journalArticle

Abstract

The issue of tracking the optimal power for wind energy conversion systems (WECSs) via regulating the rotor speed of the generator is taken into account in this study. Additionally, a novel polynomial observer is proposed for estimating not only aerodynamic torque in WECSs but also d-axis and electromagnetic torque. Therefore, in this new approach, only the rotor speed of the generator is required to be measured instead of measuring all state variables. With the new observer form, the aerodynamic torque does not need to satisfy any constraints, which are mandatory in the previous methods. It should be noted that this methodology has not been investigated for the WECSs in any previous papers. To design a complete control system, a linear optimal control method cooperated with the polynomial observer is employed to track the optimal trajectory of a generator. Moreover, in this paper, the permanent magnet synchronous generator is used. In addition, on the basis of the Lyapunov theory and sum-of-square (SOS) technique, the conditions for observer synthesis are derived in the main theorems. Finally, the simulation results are provided to prove the effectiveness and merit of the proposed method.

Original languageEnglish
JournalWind Energy
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Energy conversion
Wind power
Torque
Systems analysis
Control systems
Aerodynamics
Rotors
Polynomials
Synchronous generators
Permanent magnets
Trajectories

Keywords

  • linear quadratic regulator (LQR)
  • polynomial observer
  • SOS
  • wind energy conversion systems (WECSs)
  • wind speed estimation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

Cite this

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title = "A novel nonlinear observer-based LQ control system design for wind energy conversion systems with single measurement",
abstract = "The issue of tracking the optimal power for wind energy conversion systems (WECSs) via regulating the rotor speed of the generator is taken into account in this study. Additionally, a novel polynomial observer is proposed for estimating not only aerodynamic torque in WECSs but also d-axis and electromagnetic torque. Therefore, in this new approach, only the rotor speed of the generator is required to be measured instead of measuring all state variables. With the new observer form, the aerodynamic torque does not need to satisfy any constraints, which are mandatory in the previous methods. It should be noted that this methodology has not been investigated for the WECSs in any previous papers. To design a complete control system, a linear optimal control method cooperated with the polynomial observer is employed to track the optimal trajectory of a generator. Moreover, in this paper, the permanent magnet synchronous generator is used. In addition, on the basis of the Lyapunov theory and sum-of-square (SOS) technique, the conditions for observer synthesis are derived in the main theorems. Finally, the simulation results are provided to prove the effectiveness and merit of the proposed method.",
keywords = "linear quadratic regulator (LQR), polynomial observer, SOS, wind energy conversion systems (WECSs), wind speed estimation",
author = "Vu, {Van Phong} and Ton Do",
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