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• A New Method of Optimum Tuning for Cascade Control Systems

  Nguyen Thi Hien, Nguyen Van Dat

  Date Received: 13-11-2015 / Date Accepted: 08-03-2016

   Abstract PDF (VIETNAMESE)

  Cascade control systems are widely used in practice with one or more loops inside the primary loop and thecontrollers are in cascade. In this structure, the control signal calculated by the outer loop is the setpoint of the inner loop. This paper presents an algorithm that directly uses the experimental data to simultaneously tune parameters of the controllers in cascade control systems. The algorithm does not require a mathematical model of the plan but only one-shot experimental data collected from the closed loop system.

• Design the Optimal Controller for Cascade Control Systems Based on Experiment Data using Virtual Reference Feedback TuningApproach

  Nguyen Quang Huy, Le Vu Quan, Vu Thi Thu Giang

  Date Received: 05-08-2021 / Date Accepted: 29-10-2021

   Abstract PDF (VIETNAMESE)

  The paper introduces the method of designing optimal controllers for cascade control systems based on data obtained from an experiment, which is the Virtual Reference Feedback Tuning (VRFT) method. A special feature of this approach, a mathematical model of the actual plants is not required, only a data set achieved from the experiment is needed for acquiring the inner and outer controllers in cascade control systems. In this study, by using the VRFT method, we will achieve optimal inner and outer controllers of the cascade control system. Using these optimal controllers, the purpose of the control problem will be achieved such as the output of the cascade control system will be close to the desired output. The Matlab software is used for simulation, the simulation results show that with the achieved optimal controllers, the output of the cascade control system is asymptotic to the expected output.