Stability analysis of parallel fuzzy P + fuzzy I + fuzzy D control systems

  • Authors:
  • Vineet Kumar;A. P. Mittal;R. Singh

  • Affiliations:
  • Division of Instrumentation and Control Engineering, Netaji Subhas Institute of Technology, Delhi University, New Delhi, India 110075;Division of Instrumentation and Control Engineering, Netaji Subhas Institute of Technology, Delhi University, New Delhi, India 110075;Indian Society for Technical Education, Shaheed Jeet Singh Marg, New Delhi, India 110016

  • Venue:
  • International Journal of Automation and Computing
  • Year:
  • 2013

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Abstract

The study presented in this paper is in continuation with the paper published by the authors on parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative (FP + FI + FD) controller. It addresses the stability analysis of parallel FP + FI + FD controller. The famous "small gain theorem" is used to study the bounded-input and bounded-output (BIBO) stability of the fuzzy controller. Sufficient BIBO-stability conditions are developed for parallel FP + FI + FD controller. FP + FI + FD controller is derived from the conventional parallel proportional plus integral plus derivative (PID) controller. The parallel FP + FI + FD controller is actually a nonlinear controller with variable gains. It shows much better set-point tracking, disturbance rejection and noise suppression for nonlinear processes as compared to conventional PID controller.