Abstract
The objective of this paper is to design the robust and optimal controller to control the attitude of sun seeker system (SSS) mounted on a space vehicle to extract maximum possible current by photo voltaic (PV) cells. PV cells which are employed to provide energy to the space vehicle generates maximum current when sun’s rays are vertically incident over it. Hence sun seeker axis (SSA) position is continuously controlled to adjust the position of PV cells. Internal model controller (IMC) for robust and linear quadratic regulator (LQR) for optimal control is proposed. The result of proposed controller is compared with classical proportional integral derivative (PID) controller and pole placement technique (PPT) based controller.