system using fractional-order PIλ and PI λ D μ controllers. It is based on plotting the global
stability region in the (kp, ki)-plane for the PI λ controller and in the (kp, ki, kd)-space for the
PIλDμ controller. Analytical expressions are derived for the purpose of describing the
stability domain boundaries which are described by real root boundary, infinite root
boundary and complex root boundary. Thus, the complete set of stabilizing parameters of …