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Design of reduced-order observer-based variable structure power system stabiliser for unmeasurable state variables

Design of reduced-order observer-based variable structure power system stabiliser for unmeasurable state variables

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In the paper, to design a simpler and more economical observer-based controller, and to solve the problem associated with the unmeasurable state variables in the conventional VSC, a reduced-order (n – m) observer-based variable structure controller (ROOVSC) is proposed and applied to a power system stabiliser (PSS). This ROOVSPSS is obtained by combining the variable structure control (VSC) with a reduced-order observer (ROO): the state estimator by the ROO and the controller by the VSC, which eliminates the need to measure all the state variables in the conventional VSC-PSS. The simulation results are shown by comparison of the ROOPSS with the proposed ROOVSPSS under normal and heavy load operations.

Inspec keywords: load (electric); control system synthesis; observers; power system stability; power system control; variable structure systems; control system analysis; reduced order systems

Other keywords: state estimator; PSS; unmeasurable state variables; reduced-order observer-based variable structure control; power system stabiliser; heavy load operations; normal load operations; control simulation; control design

Subjects: Control system analysis and synthesis methods; Multivariable control systems; Simulation, modelling and identification; Power system management, operation and economics; Control of electric power systems; Stability in control theory

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