The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a new slip compensation method for the traditional scalar control (V/f) of induction motors. Based on the level of q-axis component of stator current, the steady-state slip of motor speed is estimated by means of flux-oriented current tracking that is usually applied in vector control. The method features both the simplicity of scalar control and improvement on the performance...
A wireless power transmission device consists of a transmitting module and a receiving module. Unlike most wireless power transmission researches, this paper based on the research that adopts the 15-volt direct-current power as its auxiliary power, and inversion efficiency is also considered in relation to system transmission efficiency. The research made the best of Control IC SG3525 in inversion...
This paper presents a novel method to evaluate the Volt-VAR interactions among the buses using relative gain (RG). Following the viewpoint of a multi-input-multi-output system, the Volt-VAR coupling RG is calculated based on the QV matrix which is extracted from power flow Jacobian matrix to evaluate the Volt-VAR interactions among the buses. The voltage stability weak buses are identified through...
In this paper, a new approach based on dynamic relative gain is proposed for partitioning voltage control areas in bulk power systems. The critical nodes of voltage stability are determined using voltage stability index, “L index”. The cross relative gain between the critical nodes and other nodes are calculated based on the concept of dynamic transfer function (DTF) and dynamic cross relative gain...
An ultra-wideband (UWB) Tightly Coupled Dipole Array (TCDA) composed of a horizontal inter-digital electric dipole and two WAIM layers is designed. The antenna is excited by a pair of 50Ω coaxial lines feed. A prototype was simulated. Results show that a bandwidth more than 5.7:1, with VSWR ≤ 3 from 2.4GHz to 13.6GHz, was achieved. The angle of scanning ranges up to 55° in E-plane while 50° in H-plane.
Based on digital signal processing theory, a simple method of designing interleavers is proposed for MZI with fiber ring coupled structure. The results of different coupled structures are given. The change of spectral transmittance is investigated for each design parameters deviating from ideal value and the tuning characteristics are discussed.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.