Optimizing Disturbance Rejection by Using Model-Based Compensator with User-Defined High-Frequency Gains

Vrančić, Damir; Oliveira, P. B. de Moura; Huba, Mikuláš

doi:10.1109/controlo.2018.8514546

Cited by 1 publication

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“…where (19) For the given controller filter (T F ) and the disturbance filter (T FD ) time constants (note that the calculation of both time constants, according to the desired level of noise, will be derived in the next sub-chapter), the calculation of remaining controller, model and disturbance filter parameters proceeds as given in Figure 5.…”

Section: De-momi Tuning Methodsmentioning

confidence: 99%

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Improving Disturbance-Rejection by Using Disturbance Estimator

Vrančić¹,

Huba²

2021

Control Based on PID Framework - The Mutual Promotion of Control and Identification for Complex Systems

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The main tasks of control in various industries are either tracking the setpoint changes or rejecting the process disturbances. While both aim at maintaining the process output at the desired setpoint, the controller parameters optimised for setpoint tracking are generally not suitable for optimal disturbance rejection. The overall control performance can be improved to some extent by using simpler 2-DOF PID controllers. Such a controller structure allows the disturbance rejection to be optimised, while it also improves the setpoint tracking performance with additional controller parameters (usually through the setpoint weighting factors). Since such 2-DOF structures are usually relatively simple, the optimization of tracking performance is usually limited to the reduction of process overshoots instead of achieving an optimal (fast) tracking response. In this chapter, an alternative approach is presented in which the parameters of the PID controller are optimised for reference tracking, while the performance of the disturbance rejection is substantially increased by introducing a simple disturbance estimator approach. The mentioned estimator requires adding two simple blocks to the PID controller. The blocks are the second-order transfer functions whose parameters, including the PID controller parameters, can be calculated analytically from the process characteristic areas (also called process moments). The advantage of such an approach is that the mentioned areas can be analytically calculated directly from the process transfer function (of any order with time delay) or from the time response of the process when the steady state of the process is changed. Both of the above calculations are absolutely equivalent. Moreover, the output noise of the controller is under control as it is considered in the design of the controller and compensator. The closed loop results on several process models show that the proposed method with disturbance estimator has excellent tracking and disturbance rejection performance. The proposed controller structure and tuning method also compare favourably with some existing methods based on non-parametric description of the process.

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Section: De-momi Tuning Methodsmentioning

confidence: 99%

“…First, the parameters of the PID controller are optimised for tracking performance. Then, a simple disturbance estimator is introduced to significantly increase the disturbance rejection performance [18,19]. The advantages of the above approach are twofold.…”

Section: Introductionmentioning

confidence: 99%

Improving Disturbance-Rejection by Using Disturbance Estimator

Vrančić¹,

Huba²

2021

Control Based on PID Framework - The Mutual Promotion of Control and Identification for Complex Systems

View full text Add to dashboard Cite

show abstract

Optimizing Disturbance Rejection by Using Model-Based Compensator with User-Defined High-Frequency Gains

Cited by 1 publication

References 10 publications

Improving Disturbance-Rejection by Using Disturbance Estimator

Improving Disturbance-Rejection by Using Disturbance Estimator

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