MATLAB® and Its Applications in Engineering: [Based on MATLAB 7.5 (R2007b)]

13.1. Introduction

The conventional feedback controllers find wide applications in the process industry. One of the earliest controllers that were used for control was the Proportional–Integral–Derivative (PID) controller. PID controller has proved to be remarkably effective in controlling a wide range of processes. The use of PID controller does not require an exact process model and hence, it is effective in controlling industrial processes whose models are difficult to derive. Moreover, PID controllers are based on linear control theory and are much easier to understand, so they can be implemented very easily. However, in spite of the advantages of PID controllers, they possess several disadvantages as well. If the operating points of the ...