Impact of faults on bus stability on an island 330kV mesh network on the Nigerian grid

2020 ◽  
Vol 2 ◽  
pp. 30-41
Author(s):  
Abel E. Airoboman ◽  
Ayemere P. Oriaifo ◽  
Samuel T. Wara
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Mesh Network ◽  
Voltage Profile ◽  
Ring Network ◽  
Reactive Power Flow ◽  
Control Centre ◽  
Radial Network ◽  
The Impact ◽  
National Control

This study carried out an assessment on the impact of faults on bus stability along the Benin-IkejaWest-Aiyede-Oshogbo-Benin (BIAOB) 330kV island network. The sensitivity of BIAOB as a ring network on the Nigerian grid aroused the interest behind its choice for this study. The network parameters were collated from the National Control Centre, Oshogbo and the network was modeled on the MATLAB 2015 environment using the obtained data. A high reactive power flow was observed in all the buses while the lowest voltage profile was observed on the Line-Line-Line-Ground (L-L-L-G) simulated in bus 1. This is an indication that symmetrical faults have the greatest impact on the network. Further results showed that the BIAOB network has a better voltage profile when compared with other radial network from existing literature. The paper concluded by recommending the closure of more radial network on the grid in order to improve its performance.

Power Quality Enhancement Using the Interline Power Flow Controller

2015 ◽  
Vol 6 (3) ◽  
pp. 415 ◽  
Author(s):  
Ben Slimane Abdelkader ◽  
Chelleli Benachiba
Keyword(s):  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Reactive Power Flow ◽  
Flow Controller ◽  
Ac Transmission ◽  
The Impact ◽  
Power Flow Controller

Interline Power Flow Controller (IPFC) is one of the latest generation Flexible AC Transmission system (FACTS). It is able to control simultaneously the power flow of multiple transmission lines. This paper presents a study of the impact the IPFC on profile of voltage, real and reactive power flow in transmission line in power system. The obtained results are interesting.

Improving the Performance of Long Distance Tuned AC Transmission Systems

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1133-1135
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Voltage Profile ◽  
Long Distance ◽  
Transmission Systems ◽  
Long Distance Transmission ◽  
Reactive Power Flow ◽  
Shunt Compensation ◽  
Ac Transmission ◽  
Economic Constraints

The line series reactance and shunt susceptance can be tuned by adopting series and shunt compensation. Practical, size and economic constraints will lead to limitations in location of the compensating elements at optimal points along the line. While planning long-distance transmission, it is necessary to determine not only the average degrees of compensation required, but also ensure the stable and uniform voltage profile with minimal reactive power flow.

scholarly journals Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5321
Author(s):  
Matej Tazky ◽  
Michal Regula ◽  
Alena Otcenasova
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Low Voltage ◽  
Point Of View ◽  
Electricity System ◽  
Reactive Power Flow ◽  
Main Emphasis ◽  
The Impact ◽  
Lower Voltage

The main emphasis in the operation of an electricity system is placed on its safe and reliable operation. The flow of reactive power in a network can affect voltage conditions in individual nodes of the transmission system. In recent years, there have been changes in the network that have resulted in increased capacitive reactive power flows from lower voltage levels to higher ones. These flows can cause the voltage to rise above the limit. This paper examines recent changes in the reactive power transmission in the network, especially at lower voltage levels. The possible impact of these changes on the flow of capacitive reactive power at higher voltage levels is analyzed. This paper also presents a description and the simulated impact of power lines at different voltage levels on reactive power flows. Real measurements of different types of consumers at the low-voltage (LV) level are analyzed. Finally, a simulation model was created to simulate the impact of a customer’s power contribution to the reactive power flows from the point of view of a 110 kV voltage node. This node is characterized as a supply point.

scholarly journals Allocation of distributed generation and capacitor banks in distribution system

2019 ◽  
Vol 13 (2) ◽  
pp. 437 ◽  
Author(s):  
Olatunde Oladepo ◽  
Hasimah Abdul Rahman
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
Reactive Power ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Power Losses ◽  
Capacitor Banks ◽  
Reactive Power Flow ◽  
Imaginary Power

<p>Voltage profile and power losses on the distribution system is a function of real and imaginary power loading condition. This can be effectively managed through the controlled real and reactive power flow by optimal placement of capacitor banks (CB) and distributed generators (DG). This paper presents adaptive Particle Swarm Optimization (MPSO) to efficiently tackle the problem of simultaneous allocation of DG and CB in radial distribution system to revamp voltage magnitude and reduce power losses. The modification to the conventional PSO was achieved by replacing the inertial weight equation (W) in the velocity update equation base on the particle best experience in the previous iteration. The inertial weight equation is designed to vary with respect to the iteration value in the algorithm. The proposed method was investigated on IEEE 30-bus, 33-bus and 69-bus test distribution systems. The results shows a significant improvement in the rate of convergence of APSO, improved voltage profile and loss reduction.</p>

Shunt-Series FACTS Devices on Network Constrained Unit Commitment

2016 ◽  
Vol 5 (1) ◽  
pp. 40
Author(s):  
G.A. M. Hosaini Hajivar ◽  
S.S. Mortazavi
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Reactive Power ◽  
Unit Commitment ◽  
Normal Operation ◽  
Voltage Profile ◽  
Facts Devices ◽  
Reactive Power Flow ◽  
Generation Cost ◽  
Shunt Series

<p>Shunt-Series FACTS Devices (SSFD) would play an important role in maintaining security and reduce Total Generation Cost (TGC) in the economical operation of power systems. The application of this devices to the AC model of Network-Constrained Unit Commitment (NCUC) for the day ahead scheduling is presented in this paper. The proposed AC model of NCUC with SSFD would include active and reactive power flow constraints which increase the network controllability at normal operation. A general SSFD model is introduced for the reactive power management in NCUC which is based on the reactive power injection model (RPIM). The case studies reveal that power transfer capability and voltage profile of the power system is improved by compensating SSFD. Meanwhile simulation results demonstrate the combined use of these devices to NCUC have a significant impact on maintaining network security,  lower TGC and increase using the maximum capacity of the existing transmission network.</p><p> </p>

scholarly journals IMPACT OF STATIC VAR COMPENSATORS ON POWER SYSTEM: A CASE STUDY

2014 ◽  
pp. 4-8
Author(s):  
GUNEET KOUR ◽  
G.S. BRAR ◽  
JASWANTI JASWANTI
Keyword(s):  
Power System ◽  
Power Electronics ◽  
Power Flow ◽  
Reactive Power ◽  
Flow Analysis ◽  
Load Flow ◽  
Voltage Profile ◽  
Flexible Control ◽  
Load Flow Analysis ◽  
Reactive Power Flow

With increase in load, any transmission, distribution and generating model suffers from disturbances. These disturbances effect the overall stability of the system. Criterias like voltage profile, power flows, losses tell us about the state of the system under study. Load flow analysis of the system under study is capable of providing the insight of the system. The Emergence of FACTS device is really a step forward for the flexible control or Power System Operations. FACTS is the name given to the application of the power electronics devices to control power flows and other quantities in the power system. But when it comes to implementation stage, optimizing the location becomes a great concern because of the high cost involved with FACTS devices especially converter like SVC, STATCOM etc. Static Var Compensator (SVC) is a power quality device, which employs power electronics to control the reactive power flow of the system where it is connected. It is able to provide fast-acting reactive power compensation on electrical systems. SVC is one of the methods and can be applied to obtain a system with least losses, increased power flow and healthy voltage profile. Number, location and size of SVC are the main concerns and they can be optimized to a great extent by Genetic Algorithm (GA) or any other method. Use of SVC in a system has shown considerable increase in voltage profile and power flows while decrease in losses.

Distribution System Voltage Regulation with Distributed Generation Based on VQC and SVC

2013 ◽  
Vol 748 ◽  
pp. 477-484 ◽  
Author(s):  
Peng Li ◽  
Tao Li ◽  
Jia Ming Li ◽  
Duo Xu ◽  
Ru Yu Shi
Keyword(s):  
Distributed Generation ◽  
Distribution System ◽  
Power Flow ◽  
Reactive Power ◽  
Fuzzy Controller ◽  
Voltage Regulation ◽  
Voltage Profile ◽  
Reactive Power Flow ◽  
Regulation Method ◽  
Typical Distribution

The distributed generation (DG) may lead to a great impact on the reactive power flow, feeder voltage profile and the means of voltage regulation when integrated into a typical distribution system. Therefore, there is possibility that the customers voltage violate the permissible limits. In order to regulate the voltage of the distribution system with DG, local voltage and reactive power control (VQC) based on fuzzy control theory is adopted in substation and the Static Var Compensator (SVC) is installed in the appropriate node in this paper, and the fuzzy controller of VQC has been designed at the same time. A simplified model of a real 10kV radial distribution system has been simulated in MATLAB to illustrate the use of the voltage regulation method, and the simulation results show that the proposed method can regulate the line voltage of distribution system with DG within the regulated voltage ranges.

scholarly journals Transient Stability Improvement on Jos – Gombe 330kV Line Using Static Var Compensator

2019 ◽  
pp. 1-7
Author(s):  
Joseph F. Udo ◽  
Maruf A. Aminu
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Transient Stability ◽  
Reactive Power ◽  
Optimal Placement ◽  
Eastern Region ◽  
Static Var Compensator ◽  
Transmission Grid ◽  
Reactive Power Flow ◽  
The Impact

In this paper, the result of a study carried out to determine the impact of static VAr compensator on voltage profiles and reactive power flow in the Nigerian 330kV transmission grid network is presented. The research seeks to mitigate the challenge of high reactive power on Jos – Gombe 330kV single circuit transmission line. The high reactive power is produced in that axis as a result of low industrial demand in the North-Eastern region of Nigeria which results in low-inductive loading of the long transmission line that spans from Jos to Gombe and its extension to Yola, Damaturu and Maiduguri. The study also performed optimal placement of the static VAr compensator in the area where it can influence the voltage at the static VAr compensator device connection point by controlling the reactive power flow through the grid. This was accomplished by modeling the existing 330kV Nigerian network in DIgSILENT PowerFactory. The result is an improved power stability on the line between Jos and Gombe. The voltage tolerance with the approved Nigerian Grid Code and compliance was ensured. Also, the static VAr compensator was proposed over reactors due to the fact that it is dynamically switched.

scholarly journals Optimization for Electric Power Load Forecast

2018 ◽  
Vol 8 (5) ◽  
pp. 3453 ◽  
Author(s):  
I. A. Ethmane ◽  
M. Maaroufi ◽  
A. K. Mahmoud ◽  
A. Yahfdhou
Keyword(s):  
Transmission Lines ◽  
Energy Demand ◽  
Power Flow ◽  
Power Plants ◽  
Reactive Power ◽  
Load Flow ◽  
Voltage Profile ◽  
Demand Forecast ◽  
Reactive Power Flow ◽  
Power Load

Load flow studies are one of the most important aspects of power system planning and operation. The main information obtained from this study comprises the magnitudes and phase angles of load bus voltages, reactive powers at generators buses, real and reactive power flow on transmission lines, other variables being known. To solve the problem of load flow, we use the iterative method, of Newton-Raphson. Analysis of the found results using numerical method programmed on the Matlab software and PSS/E Simulator lead us to seek means of controlling the reactive powers and the bus voltages of the Nouakchott power grid in 2030 year. In our case, we projected the demand forecast at 2015 to 2030 years. To solve the growing demand we injected the power plants in the system firstly and secondly when the production and energy demand are difficult to match due to lack of energy infrastructures in 2030.It is proposed to install a FACTS (Flexible Alternative Current Transmission Systems) system at these buses to compensate or provide reactive power in order to maintain a better voltage profile and transmit more power to customers.

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