A NEW ROBUST CONTROLLER DESIGN FOR LOAD-FREQUENCY CONTROL VIA INCOMPLETE STATE FEEDBACK

摘要

A new robust load-frequency controller using incomplete state feedback is proposed. It is suited for an uncertain power system using reheat type turbines. Such a plant contains system parameter uncertainties and an immeasurable state. The new controller design, based on the Riccati equation approach, considers the bounds of system parameters and feedback gains. Appropriate feedback gains can be chosen from their predefined bounds. This includes the selection of zero-gains for immeasurable states. The new robust controller thus uses incomplete state feedback. No observer is needed. Good performance is reported for an example system.