Topic
Electrical impedance
About: Electrical impedance is a research topic. Over the lifetime, 36015 publications have been published within this topic receiving 371891 citations. The topic is also known as: electrical impedance & complex impedance.
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Papers
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TL;DR: In this paper, a method to determine the origin of voltage sag disturbance is proposed, which can be easily implemented into power quality meters for troubleshooting applications or into digital revenue meters to document the responsibility for disturbances.
Abstract: A method to determine the origin of voltage sag disturbance is proposed in this paper. Its principle is to estimate the equivalent impedance of the nondisturbance side by utilizing the voltage and current changes caused by the disturbance. The sign of the real part of the estimated impedance can reveal if the disturbance is from upstream or downstream. The proposed method can be easily implemented into power quality meters for troubleshooting applications or into digital revenue meters to document the responsibility for disturbances. Extensive field and laboratory test results have proven the effectiveness and robustness of the proposed method.
117 citations
TL;DR: In this article, it was shown that the Warburg (diffusion) impedance is coupled to the charge transfer resistance, even to the extent that the sign of the warburg impedance is determined by that of the charge transmission resistance.
117 citations
TL;DR: In this article, the authors proposed a stability criterion for three-phase AC distributed power system (DPS) composed of an LC filter and a three phase boost rectifier, which cover the source output impedance and the load input admittance.
Abstract: This paper presents a stability criterion for three-phase AC distributed power system (DPS). While the source output impedance and the load input admittance under synchronous reference frame are generally investigated to predict the stability of the three-phase AC DPS, the infinity-norms of the impedance and admittance are innovatively adopted in the proposed criterion to improve the computational complexity and the conservatism. Meanwhile, the computational complexity and the conservatism of the proposed criterion are analyzed and compared with existing ones. Furthermore, the terminal characteristics of the studied three-phase AC DPS composed of an LC filter and a three-phase boost rectifier, which cover the source output impedance and the load input admittance, are comprehensively modeled. Finally, the effectiveness of the proposed criterion is validated by experimental results.
117 citations
TL;DR: In this paper, a tensor impedance surface waveguide structure is studied using a theoretical model and simulated using Ansoft HFSS, and two applications of tensor-imperceptible surface waveguides are presented.
Abstract: A surface waveguide structure is studied using a theoretical model and simulated using Ansoft HFSS. A tensor impedance surface is surrounded by two lower impedance surfaces on a plane. Surface waves are guided losslessly within the inner region as long as it has higher impedance than the outer region. A theoretical model is proposed which predicts the dispersion relation of the waveguide using a ray optics method. Our tensor impedance surface theory can also predict the dispersion of scalar impedance surfaces. The theory and simulation show agreement for scalar and tensor impedance surfaces. Two applications of tensor impedance surface waveguides are presented.
117 citations
18 Mar 2005
TL;DR: This work examines the theoretical behavior and practical application of frequency dependent electrical damping as it applies to haptic displays and shows a significant increase in the range of virtual wall behaviors that a one degree-of-freedom device is capable of displaying when electrical damper is added.
Abstract: This work examines electrical damping as a means for improving haptic display performance. Specifically, electrical damping, like its mechanical counterpart, can significantly reduce the occurrences of limit cycle oscillations at high impedance boundaries in virtual environments. Furthermore, electrical damping has a number of advantages including its simplicity of design and the ease at which it can be made frequency dependent so that it does not adversely affect a device's low impedance range. This work examines the theoretical behavior and practical application of frequency dependent electrical damping as it applies to haptic displays. Data is presented illustrating a significant increase in the range of virtual wall behaviors that a one degree-of-freedom device is capable of displaying when electrical damping is added.
117 citations