Topic
Proportional control
About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.
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01 Sep 2016
TL;DR: In this article, a robust current control scheme for Permanent Magnet Synchronous Machines based on the conventional cascade structure is proposed, where a genetic algorithm is used to optimize the controller and the observer parameters.
Abstract: This paper deals with a novel robust current control scheme for Permanent Magnet Synchronous Machine based on the conventional cascade structure. The main idea is to substitute the commonly used decoupling network, which requires the precise knowledge of the system parameters in any working condition, with a more flexible and robust scheme. In particular, the traditional configuration is improved by mean of two proportional-integral observers which allow the preservation of the drive performances under the effects of disturbance. The improved robustness is achieved maintaining the reliable basic scheme with a pure proportional controller in the forward path with advantages in terms of design and tuning. A genetic algorithm is used to optimize the controller and the observer parameters. This multi-objective optimization leads to a good stability and an overall improved performance of the drive above all the operative range. The choice of the optimal solution is based on a novel fitness function which takes into account both dynamical features and disturbance rejection capabilities of the system. The effectiveness of the proposed control scheme is verified by mean of numerical simulations and experiments as well.
19 citations
TL;DR: Sufficient conditions are given under which derivative and proportional state feedback controls can be constructed so that the periodic closed-loop systems are regular and of index at most one.
Abstract: In this paper, we consider the regularization problem for the linear time-varying discrete-time periodic descriptor systems by derivative and proportional state feedback controls. Sufficient conditions are given under which derivative and proportional state feedback controls can be constructed so that the periodic closed-loop systems are regular and of index at most one. The construction procedures used to establish the theory are based on orthogonal and elementary matrix transformations and can, therefore, be developed to a numerically efficient algorithm. The problem of finite pole assignment of periodic descriptor systems is also studied.
19 citations
Patent•
IBM1
TL;DR: In this paper, a system, apparatus and method for controlling temperature of an integrated circuit in a chip tester is described, where the first flowrate is associated with a first valve setting based on at least a desired temperature setpoint and an applied power.
Abstract: A system, apparatus and method for controlling temperature of an integrated circuit in a chip tester is disclosed. Embodiments include supplying a chilled fluid to a cold plate at a first flowrate, where the first flowrate is associated with a first valve setting based on at least a desired temperature setpoint and an applied power. Embodiments may determine a change in applied power and modify the chilled fluid flowrate in response to a change in testing conditions to a second flowrate associated with a second valve setting associated with at least the desired temperature setpoint and the changed testing conditions. This feed forward loop may be supplemented by a feedback loop that includes modifying the energy supplied to a cold plate heater in response to a comparison of a current temperature and the temperature setpoint. The valve may be a proportional control valve or the like.
19 citations
02 Jul 2008
TL;DR: In this article, the authors presented a strategy to tune a fractional order integral and derivative controller satisfying gain and phase margins, which has a feature of robustness to gain variations with step responses exhibiting a nearly iso-damping property.
Abstract: This paper presents a strategy to tune a fractional order integral and derivative controller satisfying gain and phase margins. The closed-loop system designed has a feature of robustness to gain variations with step responses exhibiting a nearly iso-damping property. This paper aims to apply the tuning procedure proposed to temperature control at selected points in Quanserpsilas heat flow experimental platform. From the comparison with the traditional PI/PID controller based on Ziegler Nicholpsilas tuning method, the effectiveness and validity of the proposed methodologies are illustrated.
19 citations
23 May 2015
TL;DR: In this paper, an intelligent proportional control (iPs) for trajectory tracking of nonlinear affine-in control systems with unknown internal dynamics is presented, which is based on an ultra-local model and a time-delay estimation technique.
Abstract: This paper presents a new intelligent proportional control (iPs) for trajectory tracking of nonlinear affine-in control systems with unknown internal dynamics. The referred proposed controller which is based on an ultra-local model and a time-delay estimation technique has a very simple structure and easily to be regulated. Moreover with the systems output feedback, the proposed controller dose not require any knowledge of nonlinear internal dynamics ensuring the trajectory tracking of systems output. Finally, to validate the proposed method, a nonlinear cart system which includes different kind of frictions have been considered to compare with different model free controls of time delay estimation based control (TDEC) and recursive model free control (RMFC), and illustrates its corresponding performance and robustness.
19 citations