Power quality and power disturbances have become an important increasing factor throughout electrical networks. Ferroresonance is one of these disturbances that can occur on distribution systems, causing quality and security problems. This paper analyzes the ferroresonance as a nonlinear resonance phenomenon of erratic nature and difficult prediction. The theoretical principles of this phenomen...

With the growing penetration of distributed energy resources (DER), accompanying challenges have led utilities to limit hosting capacities DER installations on distribution feeders. A static synchronous compensator (DSTATCOM) is a power electronic device provide dynamic injections and absorption reactive into grid with more flexible reliable voltage control quality improvement. management syste...

Transient overvoltages generated by lightning strikes or switching operations represent a significant risk to bushings and windings of power transformers. They cause stress on the insulation system can, over time, dielectric failure damage Many transformer failures are reported as they not necessarily linked any particular event when occur but may be result prior from transient overvoltage even...

The CVT equipment running on site is slightly modified to form a hybrid achieve transient overvoltage measurement, which theoretically feasible and practical. In order study the voltage division method based measure of power system, that is, low capacitor C3 connected in series between terminal medium C2 traditional ground, measurement realized through C3. This article uses ATP-EMTP establish i...

Aiming at the problems emerging in a pulse width modulation (PWM) drive system with long cables, accurate modeling of power cables is premise for predicting and analyzing these relevant phenomena, proper filter design key solution to problems. This paper proposes high-frequency cable models represent frequency-dependent characteristics, especially resistance which an easily overlooked factor th...

Abstract For the overvoltage problem brought by access of high-penetration photovoltaic power plants to low-voltage distribution network, this paper chooses deal with it using reactive regulation capability plant inverters, which reduces equipment investment in line voltage regulation. Based on theory inverter, a finite set model predictive direct control method is proposed constructing virtual...

The paper presents a comparison of the performance of voltage-switching devices and voltage-limiting devices for late seventies-vintage SPDs as marketed and installed in service panels in the USA and in Europe. Artifacts in the response of a typical oscilloscope to a nearby gap sparkover, and the effect of lead dress inside the panels and outdoor installation are described. Predictably, the per...

Introduction: If the patients are not satisfied with the hospital, this results in switching behavior of patients. In this situation, among different hospitals, the patients choose the hospital with higher level of service quality. So, the main aim of this paper is investigating the effect of hospital's service quality on switching behavior of inpatients in Shahid Sadoughi Hospital of Yazd. Me...

One of the difficulties with PWM switching converters is high switching loss and electromagnetic interference due to switching at non-zero voltage and current, which limits the operating frequency. In order to reduce the converter volume and weight (by increasing the frequency) and reducing switching losses, zero voltage and current switching methods are recommended. In this paper, four main ze...