Design of Linear Quadratic Gaussian Controller for Sample Power System

Most of the industrial processes are multivariable in nature. Designing controller for the Multi Input Multi Output (MIMO) process is difficult because of the changes in process dynamics and interaction between process variables. The objective of the current study presented in this paper is to design a multivariable Linear Quadratic Gaussian (LQG) Controller for a sample controlled hydropower system that comprises a hydraulic turbine driving a synchronous generator which is connected to an infinite bus via a step-up transformer and a transmission line. From the system point of view, a sample controlled hydropower system can be modelled as a two-input-two-output system, where the inputs are the exciter input voltage Ue and governor valve position Ug and the outputs are the active power Pt and the terminal voltage Vt. The validity and robustness of the proposed system is tested for reference tracking and disturbance rejection behaviour using simulation. Simulation results confirm the effectiveness of the proposed control methodology.

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