Topic
Automatic frequency control
About: Automatic frequency control is a research topic. Over the lifetime, 15123 publications have been published within this topic receiving 171510 citations.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: It is proved that the swing dynamics and the branch power flows, coupled with frequency-based load control, serve as a distributed primal-dual algorithm to solve OLC and establish the global asymptotic stability of a multimachine network under such type of load-side primary frequency control.
Abstract: We present a systematic method to design ubiquitous continuous fast-acting distributed load control for primary frequency regulation in power networks, by formulating an optimal load control (OLC) problem where the objective is to minimize the aggregate cost of tracking an operating point subject to power balance over the network. We prove that the swing dynamics and the branch power flows, coupled with frequency-based load control, serve as a distributed primal-dual algorithm to solve OLC. We establish the global asymptotic stability of a multimachine network under such type of load-side primary frequency control. These results imply that the local frequency deviations on each bus convey exactly the right information about the global power imbalance for the loads to make individual decisions that turn out to be globally optimal. Simulations confirm that the proposed algorithm can rebalance power and resynchronize bus frequencies after a disturbance with significantly improved transient performance.
484 citations
••
TL;DR: In this article, two robust decentralized control design methodologies for load frequency control (LFC) are proposed, one is based on H/sub/spl infin// control design using linear matrix inequalities (LMI) technique in order to obtain robustness against uncertainties and the second controller has a simpler structure, which is more appealing from an implementation point of view.
Abstract: In this paper, two robust decentralized control design methodologies for load frequency control (LFC) are proposed. The first one is based on H/sub /spl infin// control design using linear matrix inequalities (LMI) technique in order to obtain robustness against uncertainties. The second controller has a simpler structure, which is more appealing from an implementation point of view, and it is tuned by a proposed novel robust control design algorithm to achieve the same robust performance as the first one. More specifically, genetic algorithms (GAs) optimization is used to tune the control parameters of the proportional-integral (PI) controller subject to the H/sub /spl infin// constraints in terms of LMI. Hence, the second control design is called GALMI. Both proposed controllers are tested on a three-area power system with three scenarios of load disturbances to demonstrate their robust performances.
458 citations
••
TL;DR: In this article, a unified PID tuning method for load frequency control (LFC) of power systems is discussed, which is applicable to power systems with non-reheated, reheated, and hydro turbines.
Abstract: A unified PID tuning method for load frequency control (LFC) of power systems is discussed in this paper. The tuning method is based on the two-degree-of-freedom (TDF) internal model control (IMC) design method and a PID approximation procedure. The time-domain performance and robustness of the resulting PID controller is related to two tuning parameters, and robust tuning of the two parameters is discussed. The method is applicable to power systems with non-reheated, reheated, and hydro turbines. Simulation results show that it can indeed improve the damping of the power systems. It is shown that the method can also be used in decentralized PID tuning for multi-area power systems.
448 citations
••
TL;DR: In this article, two different control strategies are investigated and compared with each other, both with respect to the power that is needed to limit the frequency drop and the electrical and mechanical stress of the turbine.
436 citations
••
02 Oct 1988TL;DR: In this article, a predicted current control strategy with fixed switching frequency (PCFF control) is proposed for a PWM (pulsewidth-modulated) AC-to-DC converter, and experimental results show that the converter under PCFF control has bidirectional power transmission ability with high dynamic performance.
Abstract: For a PWM (pulsewidth-modulated) AC-to-DC converter, a predicted current control strategy with fixed switching frequency (PCFF control) is proposed. Its principle and implementation are described, and experimental results are provided which show that the converter under PCFF control has bidirectional power transmission ability with high dynamic performance. The line currents are close to sinusoidal with unit power factor. The PCFF control produces a better switching pattern than hysteresis current control. This results in a reduction of harmonics in the line currents and lower stress on the switching devices. >
416 citations