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Related Experiment Video

Updated: May 29, 2026

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

Published on: February 14, 2025

Modified Smith predictor based cascade control of unstable time delay processes.

Dola Gobinda Padhan1, Somanath Majhi

  • 1Department of Electronics and Electrical Engineering, Indian Institute of Technology Guwahati, Guwahati-781039, India. dola@iitg.ernet.in

ISA Transactions
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces an enhanced cascade control structure with a modified Smith predictor for unstable time-delay processes. The new design improves disturbance rejection and decouples control responses for better performance.

Related Experiment Videos

Last Updated: May 29, 2026

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

Published on: February 14, 2025

Area of Science:

  • Process Control
  • Control Engineering
  • Automation Systems

Background:

  • Controlling open-loop unstable time-delay processes presents significant challenges.
  • Existing methods often struggle with effective disturbance rejection and independent tuning of control responses.

Purpose of the Study:

  • To propose an improved cascade control structure with a modified Smith predictor.
  • To enhance the control of open-loop unstable time-delay processes.
  • To achieve superior disturbance rejection and independent tuning capabilities.

Main Methods:

  • Development of an analytical design method for disturbance rejection controllers using desired closed-loop complementary sensitivity functions.
  • Implementation of proportional-integral-derivative (PID) controllers cascaded with second-order lead/lag filters for disturbance rejection.
  • Application of the direct synthesis method for designing the setpoint tracking controller.
  • Analysis of internal stability and robustness using Kharitonov's theorem.

Main Results:

  • The proposed control scheme effectively decouples servo and regulatory responses in nominal systems.
  • The disturbance rejection capability is demonstrated to be superior compared to existing methods.
  • Independent tuning of setpoint tracking and disturbance rejection controllers is achieved.
  • Internal stability and robustness analyses confirm the scheme's reliability.

Conclusions:

  • The improved cascade control structure offers enhanced performance for unstable time-delay processes.
  • The proposed method provides superior disturbance rejection and independent control tuning.
  • The analytical design approach simplifies the implementation and demonstrates practical usefulness.