Topic
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.
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TL;DR: In this article, a nonlinear excitation controller design to enhance transient stability of multimachine power systems is presented, where a linear state feedback stabilizing controller is designed for the reduced-order linear part using optimal control theory to enhance the stability of the whole system.
Abstract: In this paper a new nonlinear excitation controller design to enhance transient stability of multimachine power systems is presented Partial feedback linearization is first used to transform the nonlinear power system model into a partially linear system comprising a reduced-order linear part and a nonlinear dynamic autonomous part Then a linear state feedback stabilizing controller is designed for the reduced-order linear part using optimal control theory to enhance the stability of the whole system In this way, the performance of the stabilizing controller would be independent of the operating points of the power system and therefore is superior to those designed for completely linearized systems It is shown that the controller design method ensures the stability of the nonlinear dynamic autonomous part The design method is applicable to multimachine power systems but tested on a 3-machine 11-bus two-area test system The performance of the proposed control scheme to large disturbances is evaluated, through computer simulation, and compared with a conventional power system stabilizer and an exact feedback linearizing controller
140 citations
Patent•
04 Oct 1989
TL;DR: In this paper, a transportable memory device (30) that holds sixty-four separate programs for microprocessor-controlled irrigation controllers is used to upload a program from a personal computer to the controller.
Abstract: Separate, but related, firmware programs for multiple microprocessor-controlled irrigation controllers (1) that are interrelated in their control of irrigation within an irrigation system are generated off-line at a personal computer (32). The programs are downloaded into a transportable memory device (30) that holds sixty-four separate programs. The memory device (30) is transported to each irrigation controller (1) and plugged to a digital communication channel (15). The device automatically identifies itself to the controller (1), and vice versa. The appropriate program is automatically uploaded from the device (30) to the controller (1). The controller's (1) old program and its historical irrigation record data is loaded into the device (30) and delivered to the personal computer (30) for validation and analysis. A wireless remote test command assembly (61), an extension maintenance panel (42), or a radio-link central module (50) may be alternatively connected to the controller's digital communication channel (15).
140 citations
TL;DR: In this article, a PI controller with dead-time compensation is described, which is based on a Smith predictor structure plus the addition of a filter acting on the error between the output and its prediction in order to improve robustness.
140 citations
Patent•
23 Jul 1993
TL;DR: In this paper, one controller is coupled to an input port on the computer game which has both a parallel-bit interface and a bit-serial interface, and each controller provides information on its own control function via the parallel interface and information derived from each of the linked controllers via the serial interface.
Abstract: Linked game controllers coupled to a single input port of a computer game are configured such that all controllers may be active at the same time. One controller is coupled to an input port on the computer game which has both a parallel-bit interface and a bit-serial interface. This controller provides information on its own control function via the parallel interface and information derived from each of the linked controllers via the serial interface. Each of the controllers includes a flag bit, in the provided information, that indicates whether the controller is the last controller in the sequence of linked controllers. The computer game stores data values provided by the parallel interface and then shifts values provided by the serial interface into an internal register until one of the flag bits, indicating the last controller in the sequence, has been shifted. The shifted data is then separated into different control functions which are then provided to the computer game apparatus.
139 citations
TL;DR: In this paper, a new method for PID controller tuning based on process models for cascaded control systems is proposed, which consists of first finding the ideal controller that gives the desired closed loop response and then finding the PID approximation of the ideal PID by Maclaurin series.
Abstract: A new method for PID controller tuning based on process models for cascaded control systems is proposed in this paper The method consists of first finding the ideal controller that gives the desired closed loop response and then finding the PID approximation of the ideal controller by Maclaurin series This method can be applied to any open loop stable processes Furthermore, it enables us to tune the PID controllers both for the inner loop and the outer loop simultaneously while existing tuning methods tune the inner loop first and the outer loop next Closed loop responses of cascade control loops tuned by the proposed method are compared with those of existing methods such as the frequency response method and the ITAE method The results show that the proposed tuning method is superior to the existing methods
138 citations