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Performance criteria and tuning of fractional-order cascade control system

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Abstract

Industrial process control systems suffer from the overshoot problem. Designing the controller plant models by conventional Proportional Integral Derivative (PID) may increase the rise time, settling time and overshoot. Cascade control is a remedial measure undertaken to overcome these problems. In this paper, we present a new cascade model using fractional-order PIDs. The fractional-order cascade controller can be expressed by fractional-order differential equations. Different laws proposed in the field of fractional calculus form the theoretical part in evaluating the equations and designing the controllers. The new structure gives improved responses for the first-order and second-order systems with time delay. Better simulation results are obtained by introducing Smith predictor in primary and secondary loops. Detailed analyses have been done on the stability, performance criteria and disturbance rejection. The usefulness of this proposed cascade structure and its superiority over normal cascade are illustrated with examples.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Kolkata, India

    Somnath Garai, Ashoke Sutradhar & Anindita Sengupta

  2. Department of Instrumentation and Control Engineering, Calcutta Institute of Engineering and Management, Kolkata, India

    Priyobroto Basu

Authors
  1. Somnath Garai
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  2. Priyobroto Basu
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  3. Ashoke Sutradhar
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  4. Anindita Sengupta
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Correspondence to Priyobroto Basu.

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Garai, S., Basu, P., Sutradhar, A. et al. Performance criteria and tuning of fractional-order cascade control system. Sādhanā 45, 268 (2020). https://doi.org/10.1007/s12046-020-01478-z

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  • DOI: https://doi.org/10.1007/s12046-020-01478-z

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