A novel integrated differential-Routh approach to develop reduced order controller with improved performance.

In this paper, a novel order reduction technique is suggested for constructing an accurate and less complex reduced order controller of a higher order system model. This reduction strategy is based on a mixed integrated Routh and differential approach that can produce the reduced-order model with the same stability properties as the real system. In this procedure, a simplified Automatic Voltage Regulator (AVR) plant's reduced transfer function (RTF) is created by reducing the numerator and denominator using a mixed Routh-differential technique. A controller for the large-order system is subsequently developed using the calculated lower-order model. The higher order AVR system's PID controller is developed using the lower-order model of the original system. Different case studies are used to study both the original higher order and the newly designed lower order AVR systems with and without the reduced controller. With the use of step responses, various error indices, time-domain responses, and sinusoidal input, the models' performances for each of the case studies are assessed. Additionally, the proposed reduced order model and developed controller's efficacy and accuracy are contrasted with those of other existing methods. [ABSTRACT FROM AUTHOR]