Abstract

Transient response control is a critical issue with many control algorithms. The transient response behavior of the system shows overshoot and settling time. Coefficient diagram method (CDM) is designed to control the trasient response of the control system because the stability indices and generalized time constant of the CDM characterize the transient response behavior of the closed-loop system. So, this paper proposes a cascaded CDM-IMC approach for the controller design. Internal model control (IMC) is a basic approach for the controller design, but it has limitations on transient response control because of the IMC filter time constant. To solve the problem associated with IMC approach, CDM is merged into the IMC to control transient response based on pre-specified time-domain specifications. Hence, in the paper, PIDA controller is designed using a cascaded CDM-IMC approach. The proposed cascaded control approach is easy in design and also controls the transient response according to the pre-specified settling time and stability indices. The proposed control scheme is validated on the three different application models. The performance of designed control scheme is analyzed using the step response. The efficacy of CDM-IMC-PIDA control scheme is assessed as compared to the recently published control schemes in terms of time-domain specifications and controller energy.

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