Optimal control in selective catalytic reduction using linear quadratic regulator

Selective Catalytic Reactor [SCR] in the existing system have been using the two classical PID controllers in cascade form. It is being employed to reduce the NOx value by predicting the set point of ammonia. When this process is being applied to a thermal power plant, we get the higher cost, increased peak overshoot and more settling time, which caused time delay affecting the process to a certain extent. In the proposed system, we are incorporating Linear Quadratic Regulator in place of two PID controllers, where we optimize the system to get a constant feedback which overcomes the existing disadvantages of the existing system. The LQR technique minimizes the energy of the system by giving minimum cost which is lesser than that of nominal cost of the system. This also gives lower cost, faster setting time and less peak overshoot when compared to PID control.