Design of Reset Control Systems: The PI + CI Compensator

Reset compensation has been used to overcome limitations of LTI compensation. In this work, a new reset compensator, referred to as PI+CI, is introduced. It basically consists of adding a Clegg integrator to a PI compensator, with the goal of improving the closed loop response by using the nonlinear characteristic of this element. It turns out that by resetting a percentage of the integral term in a PI compensator, a significant improvement can be obtained over a well-tuned PI compensator in some relevant practical cases, such as systems with dominant lag and integrating systems. The work is devoted to the development of PI+CI tuning rules for basic dynamic systems in a wide range of applications, including first and higher order plus dead time systems.

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