Topic
Frequency response
About: Frequency response is a research topic. Over the lifetime, 25705 publications have been published within this topic receiving 332249 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: A unified approach to the analysis of periodically timevarying digital filters is introduced and it is shown that this method may be used to describe both time and frequency domain responses.
Abstract: A unified approach to the analysis of periodically timevarying digital filters is introduced. It is shown that this method may be used to describe both time and frequency domain responses. By considering multirate filters as a special class of periodically time-varying filters we have characterized the frequency response of a general multirate filter. A time domain synthesis procedure for periodically varying difference equations is also presented.
428 citations
TL;DR: In this paper, the authors proposed a full-order continuous-time average model using the dc terms and first order terms of transformer current and capacitor voltage as state variables, resulting in a thirdorder model, if capacitor equivalent series resistance (ESR) is not considered, and a sixth-order model if ESR is considered.
Abstract: Full-order continuous-time average modeling and dynamic analysis of bidirectional dc-dc dual active bridge (DAB) converters are studied. The transformer current in DAB converter is purely ac, making continuous-time modeling difficult. The proposed full-order continuous-time average model uses the dc terms and first order terms of transformer current and capacitor voltage as state variables, resulting in a third-order model, if capacitor equivalent series resistance (ESR) is not considered, and a sixth-order model if ESR is considered. A control-to-output-voltage transfer function is derived for DAB converters. Experimental results confirm that the proposed model correctly predicts the small-signal frequency response and an even more accurate prediction can be obtained if capacitor ESR is taken into account.
415 citations
TL;DR: In this paper, the authors investigated the contribution of doubly fed induction generator (DFIG) to system frequency responses and investigated the impact of different governor settings and system inertia on frequency regulation.
Abstract: The paper investigates contribution of doubly fed induction generator (DFIG) to system frequency responses. Impact of different governor settings and system inertia are investigated. Three distinct cases are simulated in order to illustrate the influence of DFIG penetration on frequency regulation. Provision of inertial response by DFIG through artificial speed coupling is also presented. The effects of the inertial response on the machine behavior and its significance for frequency regulation are discussed. The influence of converter current limits and auxiliary loop parameters on the inertial response are illustrated and a novel control algorithm is developed for extracting maximum energy from the turbine in a stable manner. The results of the study are illustrated on the example of an isolated power system consisting of a diesel generator and a DFIG.
413 citations
TL;DR: In this article, the amplitude and phase response of ultrathin ZnTe and GaP electro-optic sensors is analyzed and the authors demonstrate that the inclusion of the dispersion of the second-order nonlinearity is essential.
Abstract: A detailed calculation of the amplitude and phase response of ultrathin ZnTe and GaP electro-optic sensors is presented. We demonstrate that the inclusion of the dispersion of the second-order nonlinearity is essential. Significant structures in experimental data can be explained by the theoretical response function. Correcting for the detector characteristics, we determine the precise shape of electromagnetic transients with a time resolution of 20 fs. In addition, we show that ultrafast transport of photocarriers in semiconductors can act as an efficient source for coherent electromagnetic radiation covering the entire far-to-mid-infrared regime.
411 citations
TL;DR: In this paper, a simple geometry is investigated systematically to determine the importance of various flow parameters on the frequency of the oscillations, and it is shown that the form of the coupling between the heat input and the unsteady flow has a crucial effect on the oscillation frequency.
408 citations