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.
Papers published on a yearly basis
Papers
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TL;DR: Based on indirect adaptive fuzzy control technique, a new load frequency control (LFC) scheme for multi-area power system is proposed in this paper, where the controller design, the approximation capabilities of fuzzy systems are employed to identify the unknown functions, formulate suitable adaptive control law and updating algorithms for the controller parameters.
101 citations
100 citations
16 Dec 1992
TL;DR: In this paper, a robust DFL (direct feedback linearization) nonlinear excitation controller is proposed to enhance transient stability for power systems, which is independent of the operating point.
Abstract: A robust DFL (direct feedback linearization) nonlinear excitation controller is proposed to enhance transient stability for power systems. A robust control technique for linear systems is extended to design this controller. The design of the controller is independent of the operating point. Simulation results show that the controller has the following advantages: the fault location does not need to be known and the controller can overcome the variation of the reactance of the transmission line. Both transient stability enhancement and voltage regulation can be achieved. >
100 citations
12 Oct 1998
TL;DR: In this paper, a new control strategy for a ground power unit, which is used for airplanes on the ground, is presented, where the ratio between the switching frequency and the fundamental frequency is low and in order to obtain high output performance, the controller has to be digital.
Abstract: This paper presents a new control strategy for a ground power unit, which is used for airplanes on the ground. In such a system, the ratio between the switching frequency and the fundamental frequency is low and in order to obtain high output performance, the controller has to be digital. The control is performed by a pulsewidth modulator and a voltage controller in the synchronously rotating reference frame (d-q). Design roles are given and a simulation tool is used for investigation of the controller. A 90 kVA prototype is used for validation of the principle. It is concluded by the experiments that the new controller gives a high output performance both stationary and dynamically at linear and nonlinear loads. Synchronization with the airplane is also shown to work successfully.
100 citations
01 Jul 1997
TL;DR: In this paper, a three-element structure, which is equivalent to a two-degrees-of-freedom control design, is proposed to synthesise a control system for an open-loop unstable process with time delay.
Abstract: To avoid performance limitations caused by an open-loop unstable pole, a three-element structure, which is equivalent to a two-degrees-of-freedom control design, is proposed to synthesise a control system for an open-loop unstable process with time delay. Through this proposed approach, control problems such as stabilising an unstable pole, servo-tracking and disturbance rejection can be treated independently. The resulting three-element structure can then be used to derive conventional two-degrees-of-freedom elements or conventional PID systems. Tuning rules for a PID controller are also provided. Examples are presented to illustrate the proposed method.
99 citations