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Open-loop controller

About: Open-loop controller is a research topic. Over the lifetime, 16148 publications have been published within this topic receiving 224014 citations. The topic is also known as: non-feedback controller & open-loop control law.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors investigated the use of multiple input signals for the design of power system stabilizers and thyristor-controlled series-compensation controllers and showed the benefits of combining input signals to move the system zeros to more desirable locations, allowing the controller to be more effective in providing additional damping to the interarea modes.
Abstract: We have investigated the use of multiple input signals for the design of power system stabilizers and thyristor-controlled series-compensation controllers. These examples show the benefits of combining input signals to move the system zeros to more desirable locations, allowing the controller to be more effective in providing additional damping to the interarea modes. The multiple-input-signal controller can be used as the primary control system or as a backup system when some of the controllers are temporarily unavailable. In some cases, a multiple-input-signal controller structure may be more cost effective than installing a new control device. The choices of the input signals used for the controller designs in the example systems in the article have been based on good knowledge of the systems.

226 citations

Journal ArticleDOI
TL;DR: In this paper, an all-digital approach based on the repetitive control technique was proposed for the control of a single-phase shunt active power filter with a full-bridge boost topology.
Abstract: Shunt active power filters have been proved as useful elements to correct distorted currents caused by nonlinear loads in power distribution systems. This work presents an all-digital approach, based on the repetitive control technique, for their control. In particular, a special digital repetitive plug-in controller for odd-harmonic discrete-time periodic references and disturbances is used. This approach does not introduce high gain at those frequencies for which it is not needed, and thus it improves robustness. Additionally, the necessary data memory capacity is lower than in traditional repetitive controllers. The design is performed for the particular case of single-phase shunt active filter with a full-bridge boost topology. Several experimental results are also presented to show the good behavior of the closed-loop system.

225 citations

Journal ArticleDOI
TL;DR: The design criteria, and the decision and rule structure of the control system, are described and the simulation results present the system's performance on various road types and under rapidly changing road conditions.
Abstract: Anti-blocking system (ABS) brake controllers pose unique challenges to the designer: a) For optimal performance, the controller must operate at an unstable equilibrium point, b) Depending on road conditions, the maximum braking torque may vary over a wide range, c) The tire slippage measurement signal, crucial for controller performance, is both highly uncertain and noisy, d) On rough roads, the tire slip ratio varies widely and rapidly due to tire bouncing, and e) The braking system contains transportation delays which limit the control system bandwidth. A digital controller design was chosen which combines a fuzzy logic element and a decision logic network. The controller identifies the current road condition and generates a command braking pressure signal, based on current and past readings of the slip ratio and brake pressure. The controller detects wheel blockage immediately and avoids excessive slipping. The ABS system performance is examined on a quarter vehicle model with nonlinear elastic suspension. The parallelity of the fuzzy logic evaluation process ensures rapid computation of the controller output signal, requiring less time and fewer computation steps than controllers with adaptive identification. The robustness of the braking system is investigated on rough roads and in the presence of large measurement noise. This paper describes design criteria, and the decision and rule structure of the control system. The simulation results present the system's performance on various road types and under rapidly changing road conditions.

225 citations

Journal ArticleDOI
TL;DR: In this paper, a cascaded nonlinear controller is designed for a variable speed wind turbine equipped with a Doubly Fed Induction Generator (DFIG) to optimize wind energy capture.

225 citations

Patent
Randall Hayes Ubillos1
07 Apr 1999
TL;DR: In this paper, a scalable scroll controller with a scale controller is used to modify a scale for controlling a magnification for accessing a data field having fine resolution, where the scale is adjusted based on the position of the scale controller.
Abstract: A method for accessing a data field having fine resolution is disclosed. The method includes providing a scalable scroll controller with a scale controller to modify a scale for controlling a magnification for accessing data within the data field. The method also includes receiving a first user event to select the scale controller and receiving a second user event to modify a position of the scale controller. The scale is adjusted based on the position of the scale controller. An apparatus for performing the method is also disclosed.

225 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202371
2022124
202167
202079
201998
2018155