scholarly journals Fast detection technique for voltage unbalance in three-phase power system

2021 ◽  
Vol 12 (4) ◽  
pp. 2230
Author(s):  
Ibrahim I. Al-Naimi ◽  
Jasim A. Ghaeb ◽  
Mohammed J. Baniyounis ◽  
Mustafa Al-Khawaldeh
Keyword(s):  
Power Systems ◽  
Power System ◽  
Simulation Model ◽  
Cycle Time ◽  
Detection Technique ◽  
Detection Methods ◽  
Time Duration ◽  
Voltage Unbalance ◽  
Fast Detection ◽  
Three Phase

In this paper, the problem of voltage unbalance in the three-phase power systems is examined. A fast detection technique (FDT) is proposed to detect the voltage unbalance precisely and speedily. The well-known detection methods require more than one cycle time to detect the unbalanced voltages, whereas the proposed technique detects the unbalanced situations speedily in a discrete manner. Reducing the time duration required to detect the unbalanced voltages will enhance the dynamic response of the control system used to balance these voltages. The FDT acquires the instantaneous values of the three load voltages, calculates the sum and the space vector for these voltages at each sample, and utilizes these parameters to detect the voltage unbalance accurately within a quarter of the cycle time. A proof-of-concept simulation model for a real power system has been built. The parameters of the aqaba-qatrana-south amman (AQSA) Jordanian power system are considered in the simulation model. Also, several test cases have been conducted to test and validate the capabilities of the proposed technique.

scholarly journals Impact of voltage unbalance on the performance of three-phase induction motor

2006 ◽  
Vol 24 (1) ◽  
pp. 45 ◽  
Author(s):  
P Giridhar Kini ◽  
R C Bansal ◽  
R S Aithal
Keyword(s):  
Power System ◽  
Induction Motor ◽  
Process Industries ◽  
Voltage Unbalance ◽  
Voltage Variation ◽  
Three Phase ◽  
Generating Capacity ◽  
Working Performance ◽  
Performance Variations

Availability of quality power has become an important issue for industrial utilities due to frequent performance variations in process industries. Increase in the generating capacity has not kept up pace of power demand, which results into shortage of power supply and power system network is normally subjected to varying and unequal loads across the three phases. Continuous variation of single-phase loads on the power system network leads to voltage variation and unbalance, most importantly; the three-phase voltages tend to become asymmetrical in nature. Application of asymmetrical voltages to induction motor driven systems severely affects its working performance. This paper presents the effects of voltage variation and unbalance on the performance of an induction motor driven centrifugal pump with a case study.

scholarly journals REDUCING SHORT CIRCUIT LEVELS BY USING SYSTEM SPLITTING STRATEGIES

2019 ◽  
Vol 11 (3) ◽  
pp. 309-331
Author(s):  
Assist. Prof. Dr. Inaam I. ALI ◽  
Mohanad Sh. Tarad AL-AASAM
Keyword(s):  
Power Systems ◽  
Power System ◽  
Large Scale ◽  
Short Circuit ◽  
Load Flow ◽  
Controlled Islanding ◽  
Power Stations ◽  
Stable Splitting ◽  
Three Phase ◽  
Proper Splitting

Preliminary studies on Iraqi power system show a significant increase in the short circuit level at some of the grid substations and some power stations. This increasing results from the growth of the power generation and transmission systems in size and complexity. Islanding or splitting is dividing the power system into several islands inorder to reduce short circuit levels and avoiding blackouts. The main islanding problem is determining the location of proper splitting points and load balance and satisfaction of transmission capacity constraints for each islands.This paper mainly introduces new proposed splitting strategies of large-scale power systems by using (PSS™E version 30.3 PACKAGE PROGRAME), such that, make re-interconnection of 400KV super high voltage substation based on three-phase load flow to be minimum flow at splitting point and infeed fault current details method to control short circuit levels in Iraq power system without islanding the power system into isolated islands. Controlled islanding or splitting scheme is frequently considered as the final solution to avoid blackouts of power system.Simulation IEEE-25 bus and Iraqi power system used as the test systems for this method. Furthermore, simulation results show significant effectiveness on reducing short circuit levels with same time give stable splitting islands with same frequency for preventing the system blackouts.

scholarly journals An Analysis of Wind Power Generation on the Electric Transmission System of Southern Vietnam

2021 ◽  
Vol 16 ◽  
pp. 204-212
Author(s):  
Minh-Hoa Nguyen ◽  
Van-Tan Tran ◽  
Tan-Hung Pham ◽  
Thanh-Luu Cao
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Power System ◽  
Wind Energy ◽  
Wind Turbines ◽  
Wind Farm ◽  
Wind Farms ◽  
Wind Speeds ◽  
Southern Vietnam ◽  
Three Phase

Renewable energy is an emerging candidate in power generation for the compensation of the exhausted fossil fuel, in which wind energy plays an important role. However, how wind farms impact existing power systems has still been a subject on which many researchers are studying. This study has analyzed and evaluated the four wind farms consisting of Ca-Mau (300 MW), Bac-Lieu (99 MW), Soc-Trang (100 MW) and Tra-Vinh (33 MW) located in Southern Vietnam via using the commercial package, WAsP software. Ca-Mau wind farm has the highest planned rated capacity with 51.7% among the wind farms. Each wind farm is built from three different types of wind turbines (1 MW, 2 MW and 3 MW). The estimation has shown that all of the wind farms could produce 2,265 GWh annually, and the 3-MW wind turbines are the most efficient and give the smallest losses for producing wind energy. The wind farms, with respect to environmentally friendly aspects, could avoid 978,544 tCO2 emitted to the environment annually. Additionally, the ETAP program has also been applied to simulate the effects of the proposed wind farms on the national power system including the disturbances from wind speeds, three-phase bus faults, tripping off wind farms and three-phase line faults on the power system. The results show that the wind farms are only slightly impacted.

Approximate Algorithm for Fast Calculating Voltage Unbalance Factor of Three-Phase Power System

2014 ◽  
Vol 10 (3) ◽  
pp. 1799-1805 ◽  
Author(s):  
He Wen ◽  
Da Cheng ◽  
Zhaosheng Teng ◽  
Siyu Guo ◽  
Fuhai Li
Keyword(s):  
Power System ◽  
Approximate Algorithm ◽  
Voltage Unbalance ◽  
Three Phase

Power System Adequacy Exploration Based on UC Simulation Model

2015 ◽  
Vol 734 ◽  
pp. 744-747
Author(s):  
Zhen Bin Li ◽  
Xiao Lei Zhai
Keyword(s):  
Power Systems ◽  
Power System ◽  
Simulation Model ◽  
Wind Power ◽  
Large Scale ◽  
Unit Commitment ◽  
System Operation ◽  
Short Run ◽  
Adequacy Assessment ◽  
Random Fluctuations

This paper takes Unit Commitment with Wind Power Electric Systems for instance and studies the application of relevant indicators in the short run adequacy decisions. It first conducted running adequacy assessment of the RBTS system, and then given unit combination solutions in the ample index constraints. The results show that the relevant indicators can be more accurately to depict the influence of random factors on system operation adequacy, and Unit Commitment decisions based adequacy index is able to give a unit commitment program at different adequacy levels. The research results provide a set of assessment indicators and assessment methods for short running adequacy problems of random fluctuations power accessing to large-scale power systems..

scholarly journals Experimental Research on Performance Analysis of a UPFC Damping Controller

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3261-3266
Keyword(s):  
Power System ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Stability Limit ◽  
Simulation Models ◽  
Voltage Source ◽  
Theoretical Derivation ◽  
Voltage Unbalance ◽  
Three Phase ◽  
Ac Transmission

The unified power quality conditioner is equipment used for regulated voltage distortion and voltage unbalance in a power system. This device gives unique control on the power flow and voltage stability in the transmission line within their limits and enhancing the power to flow through the preferred path. This paper presents a control scheme and Theoretical derivation of the unified power flow conditioner and the simulation results are compared and contrasted in detail. UPFC is a combination of shunt Active and series active power filters. UPFC contains a DC link capacitor in a single phase voltage source inverter with two back to back connected, three-phase three-wire and three-phase four-wire are arranged. The objective of the study is to introduce a scheme which improves the quality of power in the flexible AC transmission systems on the aspects of voltage sag and harmonic distortion apart from enhancing power transfer capability and stability limit using unified power flow conditioner In this, the power system simulation models are made on MATLAB version. The results obtained show that the UPFC controller had better performance to damp LFO compared to the other UPFC damping controllers.

scholarly journals Implementation of Symmetrical and Unsymmetrical Fault in Power System Network Using Matlab

2021 ◽  
Vol 9 (VII) ◽  
pp. 528-534
Author(s):  
Swapnil Bhardwaj
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Simulation Model ◽  
Fault Analysis ◽  
Transmission Line Model ◽  
Current Output ◽  
Three Phase ◽  
And Control ◽  
Matlab Programming ◽  
Types Of Faults

The main goal of this study is to provide a MATLAB-based simulation model for three-phase symmetrical and unsymmetrical faults. This paper shows how to deal with MATLAB programming in which a transmission line model is created and various challenges are acted out using a toolbox. Fault analysis for many types of faults has been performed, and the resultant effects may be seen in simulation output such as voltage, current, and control, as well as the positive, negative, and zero grouping parts of voltage and current output as waveforms.

Virtual Stability Estimator Model for Three Phase Power System Network

2016 ◽  
Vol 4 (3) ◽  
pp. 520 ◽  
Author(s):  
K. Nithiyananthan ◽  
Simson Samson Raja ◽  
R Sundar ◽  
A Amudha
Keyword(s):  
Power Systems ◽  
Power System ◽  
Virtual Instrument ◽  
Electrical Power ◽  
Research Work ◽  
Electrical Power Systems ◽  
Proposed Model ◽  
Three Phase ◽  
User Friendly ◽  
Steady State Stability

<p><em>The main objective of this research work is to develop a simple power systems steady state stability estimator in LabView for three phase power system network. LabVIEW based power systems stability estimator has been chosen as the main platform because it is a user friendly and easy to apply in power systems. This research work is intended to simultaneously acclimate the power system engineers with the utilization of LabVIEW with electrical power systems. This proposed work will discuss about the configuration and the improvement of the intelligent instructional VI (virtual instrument) modules in power systems for power systems stability solutions. In the proposed model power systems stability has been carried out and model has been developed such that it can accommodate the latest versions of power systems stability algorithms.</em></p>

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