VIRTUAL REFERENCE FEEDBACK TUNING IN RESTRICTED COMPLEXITY CONTROLLER DESIGN OF NON-MINIMUM PHASE SYSTEMS

The paper presents a new tracking control approach for a class of non-minimum phase linear systems. The proposed approach consists of two parts: trajectory planning and tracking controller design. The trajectory planning is solved as an optimization problem to improve the achievable transient performance under the fundamental constraints associated with perfect tracking of non-minimum phase systems. The recently proposed adaptive robust tracking controller for a class of non-minimum phase systems is then applied to guarantee that the tracking error dynamics can be stabilized with bounded internal states. The effectiveness of the proposed approach is illustrated through simulation on tracking control of a second order non-minimum phase linear system. Further works are underway to extend the proposed control strategy and trajectory design to a class of non-minimum phase nonlinear systems.

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A U-model based controller design for non-minimum phase systems: Application to Boeing 747 altitude-hold autopilot

2017 9th International Conference on Modelling, Identification and Control (ICMIC) ◽

10.1109/icmic.2017.8321624 ◽

2017 ◽

Author(s):

Ji Qiu ◽

Iman S. Delshad ◽

Quanmin Zhu ◽

Mokhtar Nibouche ◽

Yufeng Yao

Keyword(s):

Controller Design ◽

Minimum Phase ◽

Model Based ◽

Phase Systems

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Design of VRFT Based Feedback-feedforward Controllers for Enhancing Disturbance Rejection on Non-minimum Phase Systems

Chemical Product and Process Modeling ◽

10.1515/cppm-2019-0069 ◽

2020 ◽

Vol 15 (2) ◽

Author(s):

Suresh Kumar Chiluka ◽

A. Seshagiri Rao ◽

Murali Mohan Seepana ◽

G. Uday Bhaskar Babu

Keyword(s):

Disturbance Rejection ◽

Absolute Error ◽

Open Loop ◽

Minimum Phase ◽

Performance Indices ◽

Virtual Reference ◽

Point Tracking ◽

Controller Performance ◽

Feedforward Controller ◽

Phase Systems

AbstractIn this work, Virtual Reference Feedback Tuning (VRFT) based feedback-feedforward controllers are designed for non-minimum phase systems to enhance the disturbance rejection. In model based design methods the feedforward controller is inverse of the plant model reduces the controller performance in the presence of uncertainties. The novelty of the work lies in to design VRFT based controllers independently for the feedforward structure, which decouples set point tracking and disturbance rejection. The optimal filter selection and algorithms to design the controllers were proposed with non-measurable disturbance signal using open loop experimental data. These controllers are applied to discrete time non-minimum phase Flexible Transmission System (FTS) with no load, half load and full load conditions. The simulation study on FTS with feedback and feedback plus feedforward structures evaluates the effectiveness of proposed controllers. The performance indices like Integral Absolute Error (IAE), Integral Square Error (ISE), Total Variance (TV), VRFT Objective Function (JVR) and Fragility Index (FI) are used to compare the controller’s performance. The simulation results indicate that proposed feedback plus feedforward controller is superior to feedback controller.

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