An enhancement in parallel cascade scheme for non-minimum phase system

• DOI: 10.1504/ijmic.2023.129472
• Publication Date: 2023-03-11T12:30:30Z
• Authors: Manish Yadav; Hirenkumar G. Patel
• Keywords: Robustness; Minimum phase; Dead time; Internal model; Phase margin

This paper aims to control non-minimum phase (NMP) systems with dead time in the existence of uncertainty and disturbances. The parallel cascade is utilised motivate such problems, especially for slow process dynamics actuator nonlinearities. work's novelty combining a higher-order fractional-filter an inverse response dead-time compensator internal model (IMC) framework designing outer loop controller. conventional IMC scheme adopted design inner modified structure offered refinement gain margin better robustness. Riemann sheet principal investigates fractional quasi characteristic polynomial arising from time. Further, robustness test also carried out via sensitivity analysis. efficacy suggested method illustrated two case studies.