Analytical structure and stability analysis of a fuzzy PID controller

  • Authors:
  • B. M. Mohan;Arpita Sinha

  • Affiliations:
  • Department of Electrical Engineering, Indian Institute of Technology, Kharagpur 721302, India;Department of Electrical Engineering, Indian Institute of Technology, Kharagpur 721302, India

  • Venue:
  • Applied Soft Computing
  • Year:
  • 2008

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Abstract

Analytical structure for a fuzzy PID controller is introduced by employing two fuzzy sets for each of the three input variables and four fuzzy sets for the output variable. This structure is derived via left and right trapezoidal membership functions for inputs, trapezoidal membership functions for output, algebraic product triangular norm, bounded sum triangular co-norm, Mamdani minimum inference method, and center of sums (COS) defuzzification method. Conditions for bounded-input bounded-output (BIBO) stability are derived using the Small Gain Theorem. Finally, two numerical examples along with their simulation results are included to demonstrate the effectiveness of the simplest fuzzy PID controller.