چکیده - کم بود ولتاژ رایج ترین پدیده در سیستم های توزیع برق می باشد. وقوع کم بود ولتاژ ممکن است باعث آسیب جدی برای مراکز بار حساس، صنایع با اتوماسیون و تجهیزات حساس بشود. جبران کننده دینامیکی کم بود ولتاژ وسیله ای است که می تواند با تزریق ولتاژ به صورت سری به شبکه، ولتاژ بار را جبران کرده و شرایط عمل کرد مناسبی را برای آن فراهم نماید. در این مقاله، ساختار جدیدی برای جبران کننده دینامیکی کم بود ...

The security of access and information flow carries with it the risk that resources will be misused – intentionally or accidentally. Static Access Control (AC) policies based on qualitative judgements are insufficient for scenarios where roles and access requirements are subtle and change frequently. We propose using quantified risk and benefit estimates in the design and management of AC polic...

Three new bridgeless single-phase ac–dc power factor correction (PFC) rectifiers based on Cuk topology are proposed. The proposed topologies are designed to work in discontinuous conduction mode (DCM) to achieve almost a unity power factor and low total harmonic distortion of the Input current. The DCM operation gives additional advantages such as zero-current turn-ON in the power switches, zer...

An equational theory E is permutative if for all terms s, t : s =E t implies that the terms s and t contain the same symbols with the same number of occurrences. The class of permutative equational theories includes the theory of AC (associativity and commutativity). It is shown in this research note that there is no algorithm that decides E-unifiability of terms for all permutative theories. T...

In this paper a novel method for finding the fault zone on a Thyristor Controlled Series Capacitor (TCSC) incorporated transmission line is presented. The method makes use of the Support Vector Machine (SVM), used in the classification mode to distinguish between the zones, before or after the TCSC. The use of Discrete Wavelet Transform is made to prepare the features which would be given as th...

This paper presents an approach to calculate the copper and core losses caused by harmonics of the PWM of a voltage source inverter. For the analysis some models of the Smart Electric Drives (SED) library, and additionally, a Modelica library for modeling AC circuits by means of electric time phasors, are used. With the proposed analysis the influence of space phasor PWM signals on the machine ...