ABTRACT Modern solid-state induction motor drives are highly sensitive to voltage sags. Their nuisance tripping can cause long re-start delays and production losses. Although it is the supply utility’s responsibility to maintain a good quality supply system, drives manufacturers also have to take steps to harden the performance so that a drive stays on line as long as possible during a voltage ...

Voltage sag is an important power quality problem, which may affect domestic, industrial and commercial customers. Voltage sags may either decrease or increase in the magnitude of system voltage due to faults or change in loads. Momentary and sustained over voltage and under voltage ma y cause the equipment to trip out, which is highly undesirable in certain application. In order to maintain th...

The transient characteristics of short-circuit current (SCC) in doubly-fed induction generator (DFIG) are quite different from the widely researched conventional synchronous machines. However, second harmonic SCC that impact reliability transformer protection have not been accurately analysed. This paper presents generation mechanism DFIG by deducing dynamic response rotor-side converter, with ...

Voltage sags and swells are significant issues of power quality. In order to alleviate voltage on sensitive loads, a method is proposed evaluate the bus grid structure based sags/swells using ellipse parameters. The matrix established for caused by four types short-circuit faults. can be converted into minor axis major Clarke transformation, accordingly sag swell obtained with interaction betwe...

This paper presents a combinational quantum-inspired binary gravitational search algorithm (QBGSA) for solving the optimal power quality monitor (PQM) placement problem in power systems for voltage sag assessment. In this algorithm, the standard binary gravitational search algorithm is modified by applying the concept and principles of quantum behaviour as to improve the search capability with ...

This paper investigates the power quality problems which occur frequently in supply and suggests a method to mitigate by implementation of UPQC. P-Q generally concern with voltage sags/swells harmonic currents. Custom Power (CP) devices that these have gained more attention recent decades. UPQC is Designed, modelled setup experimentally sag/swells currents three phase systems. consists Dynamic ...

This project presents a power quality improvement of unified power quality conditioner (UPQC) to compensate current and voltage quality problems of sensitive loads. The UPQC consists of the series and shunt converter having a common dc link. The series converter mitigates voltage sag from the supply side and shunt converter eliminates current harmonics from the nonlimear load side. The develope...

---------------------------------------------------------------------***-------------------------------------------------------------------Abstract: – Dynamic voltage restorer (DVR) is the mostly used custom power device for improving power quality indices. The main function of DVR is to mitigate the problems of voltage sag and voltage swells. In this paper, DVR is used to control voltage sag a...

Intelligent Universal Transformer (IUT) is a power electronic base transformer introducing for Advanced Distribution Automation (ADA) in future. ADA is the state of art employing the new architecture based on both the flexible electrical network and open communication construction comprise the Future Distribution System. Fuzzy control is a method based on fuzzy logic concept emphasizes on fuzzy...

The recent trend of distributed generation leads to several issues regarding power quality and energy efficiency. To meet the increased demand of electricity services and to increase service quality the current power grid structure should be controlled in such a way that distributed generation could be easily connected to it. The various services are becoming challenging concern to elegantly in...