The Operation and Model of UPQC in Voltage Sag Mitigation Using EMTP by Direct Method

Nowdays, regarding to the great us of sensitive devices, the quality of the transmitted power, have become an important issue. One of the most important dimension of power quality is magnitude load terminal voltage. Different devices has been designed for voltage sag compensation or other distortions. UPQC is a compensator which is able to compensate all distortions, such as voltage sag, flicker, unbalance, harmonic and current distortions such as reactive, harmonic and unbalance. Several controllers have been designed to compensate the whole or a part of distortions. In this paper its going to introduce a kind of controller which is able to compensate voltage sag to direct and simple by UPQC. At the end, simulation and voltage sag mitigation is going to be performed by ATP-EMTP software.

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Power Quality Problems in PV Fed Grid Connected Inverter

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.622.147 ◽

2014 ◽

Vol 622 ◽

pp. 147-151

Author(s):

Natesan Saritha ◽

Venkatesan Jamuna ◽

N. Nanthini

Keyword(s):

Power Systems ◽

Power Quality ◽

System Performance ◽

Short Circuit ◽

Multilevel Inverter ◽

Voltage Sag ◽

Pv Inverter ◽

Power Quality Disturbances ◽

Grid Connected Inverter

—– In this paper, problem faced by grid connected pv inverter is presented. Inverters connected to grid are mostly affected due to short circuit problems in the power systems. Therefore it is essential to analyze power quality disturbances in order to improve the quality of the system. Performance of inverter is affected severely by voltage sag compared to other type of power quality disturbances. Also in this paper, multilevel inverter with sag condition and without sag condition is simulated using MATLAB/SIMULINK software

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Power Quality Improvement Using Unified Power Quality compensator

International Journal of Advanced Trends in Computer Science and Engineering ◽

10.30534/ijatcse/2021/241042021 ◽

2021 ◽

Vol 10 (4) ◽

pp. 2803-2809

Keyword(s):

Power Systems ◽

Power Quality ◽

Distribution System ◽

Supply Voltage ◽

Voltage Sag ◽

Harmonic Currents ◽

Power Quality Improvement ◽

Power Quality Disturbances ◽

Quality Of Electric Power

Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric/ electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply voltage variations, etc. In recent years the demand for the quality of electric power has been increased rapidly. Power quality problems have received a great attention nowadays because of their impacts on both utilities and customers. Voltage sag, swell, momentary interruption, under voltages, over voltages, noise and harmonics are the most common power quality disturbances.It proposes a new connection for a unified power quality compensator (UPQC) to improve the power quality of two feeders in a distribution system. It illustrates how UPQC can improve the power quality by mitigating all these PQ disturbances. The proposed configuration of the UPQC is developed and verified for various power quality disturbances by simulating the mode using MATLAB.

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Simulation of Location of TCSC and UPFC in Fourteen Bus System Using Matlab / Simulink

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.3594 ◽

2011 ◽

Vol 403-408 ◽

pp. 3594-3599

Author(s):

R. Selvarasu ◽

C.Christober Asir Rajan

Keyword(s):

Power Quality ◽

Power Flow ◽

Voltage Sag ◽

Unified Power Flow Controller ◽

Simulation Studies ◽

Facts Devices ◽

Thyristor Controlled Series Compensator ◽

Power Flow Controller ◽

Bus System

This paper presents the modeling and simulation of 14-bus system using TCSC and UPFC. Thyristor Controlled Series Compensator (TCSC) and Unified Power Flow Controller (UPFC) are included in 14-bus system to improve the power quality of the power system. The voltage sag is created by adding an extra load at the receiving end. This sag is compensated by using FACTS devices like TCSC and UPFC. Improvement in the voltage and power are presented using simulation studies.

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Analysis of power quality in a grid system connected with a three phase induction motor

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2020-0054 ◽

2020 ◽

Vol 21 (4) ◽

Author(s):

Bandla Pavan Babu ◽

Indragandhi Vairavasundaram

Keyword(s):

Induction Motor ◽

Power Quality ◽

Voltage Sag ◽

Test Procedures ◽

Three Phase ◽

Power Frequency ◽

Frequency Variations ◽

System Power ◽

Simulator Test

AbstractIn an electrical system, power quality (PQ) is becoming significant to all types of consumers. With the increase of power demand from end users, maintaining the quality of power within the limitations is a major problem. This paper describes power quality issues like voltage sag, voltage variations, voltage fluctuations, individual harmonics, inter-harmonics and power frequency variations in a grid connected system with a three-phase induction motor connected as a load. This system is tested in according to International Electro technical Commission (IEC) Std. 61000-4-11/4-13/4-14/4-28 which are allowed to the load through a regenerative grid simulator. Test procedures of the system equipment and the detailed analysis of the monitored and measured results are also described in this paper.

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Mitigation Balanced/ Unbalanced Voltage Sag and Phase Jumping Using Unified Power Quality Conditioner UPQC with Three Voltage Compensation Methods

Al-Kitab Journal for Pure Sciences ◽

10.32441/kjps.v2i1.149 ◽

2018 ◽

Vol 2 (1) ◽

Cited By ~ 1

Author(s):

Mahmood Alkhayyat ◽

Sinan Bashi ◽

Abdul ghani A.

Keyword(s):

Power Quality ◽

Distribution System ◽

Harmonic Distortion ◽

Active Filters ◽

Point Of View ◽

Voltage Sag ◽

Active Device ◽

Compensation Methods ◽

Unbalance Voltage

Semiconductors are extensively used in many industrial and residential applications that leads to drop in the quality of voltages and currents in distribution system. Faults causes balance or unbalance voltage sag and phase jumping. Sensitive loads effected not only by the voltage sag but also by the variation in phase angle specially the motor drive systems. Poor power quality may cause interruption of production and coasting a huge amount of money. New remedies that adopted in recent years are using active filters. UPQC is an active device used to enhance the quality of the load voltage as well as current of utility. Little attention is made in literature for comparing methods of injection voltage in the case of unbalance voltage and phase jumping. Three methods of voltage sag compensation based on the mode of injected voltage are adopted. A deep comparison between synchronous reference frame, quadrature injection voltage and pre-sag compensation methods based on the rating, total harmonic distortion, phase jumping mitigation point of view show that a proposed presage compensation method is more suitable for mitigation voltage sag. Abnormal voltages and currents are recovered simultaneously in all studied cases.

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Aplikasi Dynamic Voltage Restorer Series Pada Analisis Voltage Sags

Jurnal Natural ◽

10.30862/jn.v9i2.329 ◽

2012 ◽

Vol 9 (2) ◽

Author(s):

Marthen Liga

Keyword(s):

Power System ◽

Electric Power ◽

Power Quality ◽

Electric Power System ◽

Voltage Sag ◽

Dynamic Voltage Restorer ◽

Voltage Restorer ◽

Dynamic Voltage ◽

Quality Of Electric Power

An electric power system must have a high level of reliability that the system is able to provide the required supply of electrical energy continuously and with good power quality, in terms of voltage regulation and frequency regulation. Decline in the quality of electric power will make serious disruption to the operational process industry customers.Dynamic voltage restorer (DVR) is a method of power quality solutions that are used to recover the voltage drop (sag) through the injection voltage on the network. Minimum power injection method is the minimum active power supplied to the load as a result of the voltage sag compensation so as to restore the load voltage back to normal. Control of dynamic voltage restorer produces a rapid and appropriate response to be the right solution to improve the quality of electric power system. Dynamic voltage restorer series is used to improve the quality of the voltage due to voltage sag that can interfere with the performance of critical equipment or sensitive equipment. Performance Series DVR is shown as an interruption of the voltage sag caused by a short circuit or some disturbance of the phase and three phase power system. Process simulation using MATLAB-SIMULINK software to the electric power system toolbox.

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Probe and Analyze the Influence that Heavy Duty Motor’s Start Exercise over the Power Quality of Circuit

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.2098 ◽

2011 ◽

Vol 66-68 ◽

pp. 2098-2102

Author(s):

Mei Li ◽

Dong Mei Zhao ◽

Yu Sup Nijat ◽

Zhi Ming Xie

Keyword(s):

Power Quality ◽

High Capacity ◽

Oil Refinery ◽

Voltage Sag ◽

Heavy Duty ◽

Monitoring Result

It is based on the monitoring result a motor of 1600KW start of petro-chemical oil refinery in Urumqi , the paper probe and analyze that high-capacity motor’s start exercise bad influence over the power quality of circuit: voltage sag and harmonics current, and take some improving actions based on its features.

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