Reduced – Order Controller Design in Discrete Time Domain
The complexities of physical systems make their analysis rather difficult and possibly a non desirable task, mainly due to difficult economical and computational considerations involved. This makes the use of reduced-order controller in physical system, which constitutes a good approximation of full order control system. In this paper we developed a method which preserves time domain as well as the frequency domain characteristics of original discrete time systems with higher order controller and their application for the control of discrete-time systems. A new mixed method, improved Routh stability method using p-domain transformation have been proposed which patches up the short comings of bilinear transformation and yields stable system with reduced order controller. It provides comparatively favorable results in comparison of other existing methods.
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