The PI+CI compensator is a simple reset compensator, its base system is a PI, which has been shown to be effective in a number of practical applications. One fundamental parameter to be tuned is the reset ratio;for la...
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ISBN:
(纸本)9783902823182
The PI+CI compensator is a simple reset compensator, its base system is a PI, which has been shown to be effective in a number of practical applications. One fundamental parameter to be tuned is the reset ratio;for lag dominant systems or systems with integrators it is known to give good results overcoming PI compensation. In this work, a systematic method for the tuning of a variable reset ratio (variable at the reset instants) is developed for first and second order plants.
This paper presents two realizations a 2-DOF PI fuzzy gain-scheduling controller for wide-range speed control of combustion turbogenerators. The 2-DOF scheme allows independent tuning of the reference tracking and the...
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ISBN:
(纸本)9783902823182
This paper presents two realizations a 2-DOF PI fuzzy gain-scheduling controller for wide-range speed control of combustion turbogenerators. The 2-DOF scheme allows independent tuning of the reference tracking and the disturbance rejection characteristics for the controlled system. Then, the fuzzy approach extends these characteristics all over the operating space of the combustion turbogenerator. Both realizations can be inserted into the speed control loop of existing controlsystems without degrading performance. Once in the loop, the controllers can be progressively tuned on-site, based on the inspection of speed responses. The proposed 2-DOF PI fuzzy gain-scheduling control schemes are suitable for application on actual combustion turbogenerators.
A simple design method for robust PID controllers is presented. It is based on a multi criteria H∞ optimal control formulation, which is shown to be easily solved by a few lines of MATLAB code. This optimal solution ...
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ISBN:
(纸本)9783902823182
A simple design method for robust PID controllers is presented. It is based on a multi criteria H∞ optimal control formulation, which is shown to be easily solved by a few lines of MATLAB code. This optimal solution for PID controllers including low pass filtering, is complemented by a simple paper and pen solution that can be used to obtain nearly optimal solutions. The presented approach is shown to give significantly better results compared to ordinary text book solutions based on frequency domain loop shaping. The paper also includes a discussion on how to best formulate PID controllers for design, and how additional filtering may easily improve high frequency robustness.
In this paper, design of PID controller is analyzed for unstable second order processes with time delay based on IMC method and H2 minimization. A new desired closed loop transfer function is obtained based on which t...
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ISBN:
(纸本)9783902823182
In this paper, design of PID controller is analyzed for unstable second order processes with time delay based on IMC method and H2 minimization. A new desired closed loop transfer function is obtained based on which the PID controller is designed. Maclaurin series is used to approximate the controller expression as a PID controller. Improved closed loop performances are achieved with the proposed method when compared to the recently reported methods in the literature. Comparative analysis has also been carried out with modified Smith predictor schemes and showed that the proposed method is superior. Further, an analysis is carried out based on maximum sensitivity for arriving at systematic guidelines for selection of the closed loop tuning parameter which is essential for unstable systems. The bounds for this tuning parameter are analyzed using the maximum sensitivity.
The first study with a PID controller based automatic drug delivery system for propofol anesthesia in children is presented. It is shown that a robustly tuned PID controller is capable of delivering safe and adequate ...
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ISBN:
(纸本)9783902823182
The first study with a PID controller based automatic drug delivery system for propofol anesthesia in children is presented. It is shown that a robustly tuned PID controller is capable of delivering safe and adequate anesthesia. The design process of the control system is reviewed. Results are discussed and compared to those of two previous studies in adults.
In this paper, an online adaptation scheme for tuning of PID parameters is presented. This scheme is based upon our previous works on using a data-driven method to obtain a sufficient condition for robust stability an...
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ISBN:
(纸本)9783902823182
In this paper, an online adaptation scheme for tuning of PID parameters is presented. This scheme is based upon our previous works on using a data-driven method to obtain a sufficient condition for robust stability and integrating robustness into the Unfalsified control framework. Here, a modified bumpless transfer approach to facilitate the adaptation of the PID controller parameters is presented. The proposed scheme is demonstrated using a PID benchmark problem.
The purpose of this paper is to present the development and evaluation of a novel PID autotuner. Based on prior art results, the algorithm uses the location of the critical point and the value of the critical frequenc...
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ISBN:
(纸本)9783902823182
The purpose of this paper is to present the development and evaluation of a novel PID autotuner. Based on prior art results, the algorithm uses the location of the critical point and the value of the critical frequency of the process to impose a user specified robustness on the closed loop. It is shown that the method is easy to apply with few choices left for the user. Nevertheless it is quite successful on systems which are relevant from process engineering point of view.
Many functions of operating systems are keen to be realised as feedback controllers. Doing so has a non negligible design impact, but also a significant payoff in terms of simplicity and generality. This paper present...
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ISBN:
(纸本)9783902823182
Many functions of operating systems are keen to be realised as feedback controllers. Doing so has a non negligible design impact, but also a significant payoff in terms of simplicity and generality. This paper presents a complete operating system scheduler, at present implemented in a microcontroller kernel, entirely composed of a PI-based control structure. The proposed scheduler is experimented with in several load conditions. In all of them, it performs in a comparable manner with respect to the classical (i.e., not control-based) policy optimised for that condition, as long as design assumptions such as schedulability are met. In addition, if some off-design situation is encountered, the proposed control-based scheduler definitely outperforms those not conceived as controllers.
The paper presents theoretical insights which might lead to further development of improved relay-based PID autotuners. The analysis is based on the first generation of autotuners, namely the widely used Åstr...
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ISBN:
(纸本)9783902823182
The paper presents theoretical insights which might lead to further development of improved relay-based PID autotuners. The analysis is based on the first generation of autotuners, namely the widely used Åström- Hägglund relay-feedback tuner. The analysis is accompanied by illustrative examples. The performance of the autotuners is evaluated against a reference PID controller which is designed using computer aided design tools and assuming full knowledge of the system's transfer function. The paper is concluded by pointing towards some ideas to design a more generally valid version of the PID autotuner.
The major input signals entering the PID controller are;the setpoint, the process output, and measurable load disturbances. By feeding these signals through suitable filters, the properties of the feedback loop can be...
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ISBN:
(纸本)9783902823182
The major input signals entering the PID controller are;the setpoint, the process output, and measurable load disturbances. By feeding these signals through suitable filters, the properties of the feedback loop can be improved significantly. This presentation will treat setpoint handling, feedforward from load disturbances, TITO (two input two output) control, noise filtering, and process dynamics compensation. An industrial case from the steel industry is also discussed.
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