A new approach to PI-PD controller Design using modified relay feedback

In this paper PI-PD control methodology is used to achieve the control objectives for the systems which had already been subjected to PID control scheme using previously known methods, the new method incorporates features of the two methods and produces better results for the same set of examples. Although designing and tuning a proportional-integral derivative (PID) and PI-PD controllers appears to be conceptually spontaneous, but it can be hard in practical applications, particularly if multiple (often conflicting) objectives are to be achieved. This paper uses modified relay feedback based identification technique in order to obtain its initial parameters from limit cycle output, after that PI-PD controllers are tuned using proposed tuning method that produces desired results.