Performance study of multiresolution PI controller for third order system

This paper deals with the development of a three term controller with varying resolution applicable to a standard third order plant. In the proposed controller, multi resolution property of WT is employed to decompose the error signal into frequency components at different levels of the decomposition. The values thus obtained are weighted by tuned constants and summed up to yield the final driving output. Calculated performance quotients infer that the designed one needs lesser time to attain specified time domain response as well as improved extraneous disturbance suppression potency compared to conventional counterpart. Also the same has an ability to provide smooth control signal. National Instruments (NI) LabVIEW software is used to develop this controller.