International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
The document presents a simple algorithm for distribution system load flow analysis that can accommodate distributed generation. It begins by outlining the objectives, motivation and special features of distribution networks that require modified load flow analysis. It then describes the proposed forward-backward sweep method and models for loads and distributed generation. The algorithm is tested on three test systems and results show reductions in losses and improved voltage profiles with distributed generation integrated using the proposed method and models.
The document provides an introduction to power system analysis. It discusses the components of a power system including generators, transformers, transmission lines and loads. It explains that power system analysis involves monitoring the system through load flow analysis, short circuit analysis and stability analysis in order to maintain the system safely and economically. It also discusses the need for power system analysis in planning and operating the system, and ensuring power demand is met through reliable generation and transmission of electricity.
An Optimal Power Flow (OPF) Method withImproved Voltage Stability AnalysisNiraj Solanki
This document discusses an optimal power flow method with improved voltage stability analysis. It introduces voltage stability and instability concepts. It then describes a voltage stability indicator L derived from fundamental circuit laws that can predict proximity to voltage collapse. The document outlines the formulation of an optimal power flow problem to minimize generation costs and indicator L. It applies this method to the 9-bus WSCC test system in MATLAB and concludes the indicator can accurately predict voltage stability problems and vulnerable locations.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
The document discusses power flow analysis, which determines the voltage, current, real power, and reactive power at points in an electrical network under normal operating conditions. It provides three key points:
1. Power flow analysis is important for planning, operations, and future expansion of power systems by studying the effects of new loads, generators, or transmission lines.
2. The analysis involves classifying buses as slack, generator, or load buses and formulating the network equations based on the bus admittance matrix.
3. Solving the load flow problem involves determining the complex voltages across all buses given the network configuration and bus demands. This provides critical information for monitoring overloads and voltage deviations.
IRJET- Load Balancing using Fact DevicesIRJET Journal
This document discusses load balancing in distribution systems using FACTS devices. It begins with an introduction to load balancing challenges in distribution systems due to varying and uneven loads over time and location. FACTS devices like D-STATCOM can be used to balance loads by injecting compensating currents. The document then presents the control circuit used for D-STATCOM, which generates reference currents based on instantaneous real and reactive power calculations. A simulation model is shown demonstrating how D-STATCOM can balance an unbalanced and non-linear load, reducing total harmonic distortion. In conclusion, D-STATCOM is an effective FACTS device for distribution system load balancing and power quality improvement.
The high penetration of power electronic based distributed energy resources (DERs) has increased the importance and attention given to voltage security of distribution systems. Voltage control in the electrical power system is critical for a proper operating condition. Therefore, distribution systems must have the ability to maintain a secure voltage profile. Using inverters for Volt/VAR control (VVC) can provide a faster response for voltage regulation than traditional voltage regulation devices, such as transformer load tap changers and voltage regulators. The primary objective of this paper is to demonstrate how smart inverters can be used to eliminate the voltage deviation by solving a mixed-integer quadratic program to determine the amount of reactive power that should be injected or absorbed at the appropriate nodes. The proposed method incorporates capacitor banks connected to the network and determines whether to turn on or off the capacitor bank for voltage regulation. These processes will be demonstrated in several cases that are focused on mitigating voltage-dips and swells.
This document contains three assignments related to electric power systems. Assignment 1 contains two questions about determining power angle and swing equations for a generator connected to an infinite bus system under normal and fault conditions. Assignment 2 contains two questions about calculating critical clearing angle and time for a generator delivering power to an infinite bus when a fault occurs. Assignment 3 defines group assignments where students are to write papers on topics related to power system stabilizers, PV and QV curves, and the effect of excitation systems.
The document presents a simple algorithm for distribution system load flow analysis that can accommodate distributed generation. It begins by outlining the objectives, motivation and special features of distribution networks that require modified load flow analysis. It then describes the proposed forward-backward sweep method and models for loads and distributed generation. The algorithm is tested on three test systems and results show reductions in losses and improved voltage profiles with distributed generation integrated using the proposed method and models.
The document provides an introduction to power system analysis. It discusses the components of a power system including generators, transformers, transmission lines and loads. It explains that power system analysis involves monitoring the system through load flow analysis, short circuit analysis and stability analysis in order to maintain the system safely and economically. It also discusses the need for power system analysis in planning and operating the system, and ensuring power demand is met through reliable generation and transmission of electricity.
An Optimal Power Flow (OPF) Method withImproved Voltage Stability AnalysisNiraj Solanki
This document discusses an optimal power flow method with improved voltage stability analysis. It introduces voltage stability and instability concepts. It then describes a voltage stability indicator L derived from fundamental circuit laws that can predict proximity to voltage collapse. The document outlines the formulation of an optimal power flow problem to minimize generation costs and indicator L. It applies this method to the 9-bus WSCC test system in MATLAB and concludes the indicator can accurately predict voltage stability problems and vulnerable locations.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
The document discusses power flow analysis, which determines the voltage, current, real power, and reactive power at points in an electrical network under normal operating conditions. It provides three key points:
1. Power flow analysis is important for planning, operations, and future expansion of power systems by studying the effects of new loads, generators, or transmission lines.
2. The analysis involves classifying buses as slack, generator, or load buses and formulating the network equations based on the bus admittance matrix.
3. Solving the load flow problem involves determining the complex voltages across all buses given the network configuration and bus demands. This provides critical information for monitoring overloads and voltage deviations.
IRJET- Load Balancing using Fact DevicesIRJET Journal
This document discusses load balancing in distribution systems using FACTS devices. It begins with an introduction to load balancing challenges in distribution systems due to varying and uneven loads over time and location. FACTS devices like D-STATCOM can be used to balance loads by injecting compensating currents. The document then presents the control circuit used for D-STATCOM, which generates reference currents based on instantaneous real and reactive power calculations. A simulation model is shown demonstrating how D-STATCOM can balance an unbalanced and non-linear load, reducing total harmonic distortion. In conclusion, D-STATCOM is an effective FACTS device for distribution system load balancing and power quality improvement.
The high penetration of power electronic based distributed energy resources (DERs) has increased the importance and attention given to voltage security of distribution systems. Voltage control in the electrical power system is critical for a proper operating condition. Therefore, distribution systems must have the ability to maintain a secure voltage profile. Using inverters for Volt/VAR control (VVC) can provide a faster response for voltage regulation than traditional voltage regulation devices, such as transformer load tap changers and voltage regulators. The primary objective of this paper is to demonstrate how smart inverters can be used to eliminate the voltage deviation by solving a mixed-integer quadratic program to determine the amount of reactive power that should be injected or absorbed at the appropriate nodes. The proposed method incorporates capacitor banks connected to the network and determines whether to turn on or off the capacitor bank for voltage regulation. These processes will be demonstrated in several cases that are focused on mitigating voltage-dips and swells.
This document contains three assignments related to electric power systems. Assignment 1 contains two questions about determining power angle and swing equations for a generator connected to an infinite bus system under normal and fault conditions. Assignment 2 contains two questions about calculating critical clearing angle and time for a generator delivering power to an infinite bus when a fault occurs. Assignment 3 defines group assignments where students are to write papers on topics related to power system stabilizers, PV and QV curves, and the effect of excitation systems.
This document summarizes a study on modelling and automating a Controllable Network Transformer (CNT). The CNT augments an existing load tap-changing transformer with an AC chopper to control voltage magnitude and phase angle. The study models the CNT using MATLAB and automates its response to system voltage variations. Simulation results demonstrate the CNT's ability to dynamically control output voltage between taps by varying the chopper's pulse width. An automatic tap and pulse selector subsystem chooses the appropriate tap and pulse width based on the required voltage. The automated CNT model proves CNT is a valuable solution for future grid network links by providing flexible voltage matching and bidirectional power flow control.
IRJET- Analysis of Open Loop Distribution Static Compensator for Improvin...IRJET Journal
This document discusses the analysis and simulation of an open loop distribution static compensator (D-STATCOM) for improving power quality in a distribution system. Key points:
1. A D-STATCOM model is developed in MATLAB Simulink to compensate for reactive power demand from nonlinear and unbalanced loads, improve source power factor, and reduce total harmonic distortion in source currents.
2. Simulation results show that before compensation, source currents are unbalanced and distorted due to nonlinear loads. The D-STATCOM is able to maintain unity power factor at the source and mitigate harmonics after compensation.
3. Operating modes of the D-STATCOM include reactive power compensation to regulate voltage, and active power compensation
The document describes two improved direct torque control (DTC) methods for a three-level inverter-fed induction motor drive. Method I selects voltage vectors based on torque and flux demands while inserting intermediate vectors to ensure neutral point balance and smooth switching. Method II uses discrete space vector modulation to synthesize vectors, decoupling vector selection from circuit limitations and solving neutral point and switching issues. Both methods were validated through MATLAB simulation and experiments to enhance DTC performance for three-level inverters while considering their unique challenges.
Artificial Intelligence Technique based Reactive Power Planning Incorporating...IDES Editor
This document summarizes a research paper that proposes using artificial intelligence techniques and FACTS controllers for reactive power planning in real-time power transmission systems. The paper formulates the reactive power planning problem and incorporates flexible AC transmission system (FACTS) devices like static VAR compensators (SVC), thyristor controlled series capacitors (TCSC), and unified power flow controllers (UPFC). Evolutionary algorithms like evolutionary programming (EP) and differential evolution (DE) are applied to find the optimal locations and settings of the FACTS controllers to minimize losses and costs. Simulation results on IEEE 30-bus and 72-bus Indian test systems show that UPFC performs best in reducing losses compared to SVC and TCSC.
INTRODUCTION BASIC TECHNIQUES TYPE OF BUSES
Y BUS MATRIX POWER SYSTEM COMPONENTS BUS ADMITTANCE MATRIX
Power (Load) flow study is the analysis of a power system in normal steady-state operation
This study will determine:
Line Losses in the 14-Bus Power System Network using UPFCIDES Editor
Controlling power flow in modern power systems
can be made more flexible by the use of recent developments
in power electronic and computing control technology. The
Unified Power Flow Controller (UPFC) is a Flexible AC
transmission system (FACTS) device that can control all the
three system variables namely line reactance, magnitude and
phase angle difference of voltage across the line. The UPFC
provides a promising means to control power flow in modern
power systems. Essentially the performance depends on proper
control setting achievable through a power flow analysis
program. This paper presents a reliable method to meet the
requirements by developing a Newton-Raphson based load
flow calculation through which control settings of UPFC can
be determined for the pre-specified power flow between the
lines. The proposed method keeps Newton-Raphson Load Flow
(NRLF) algorithm intact and needs (little modification in the
Jacobian matrix). A MATLAB program has been developed to
calculate the control settings of UPFC and the power flow
between the lines after the load flow is converged. Case studies
have been performed on IEEE 5-bus system and 14-bus system
to show that the proposed method is effective. These studies
indicate that the method maintains the basic NRLF properties
such as fast computational speed, high degree of accuracy and
good convergence rate.
IRJET- Load Flow Analysis of IEEE 14 Bus Systems in Matlab by using Fast Deco...IRJET Journal
The document presents a simulation of load flow analysis for the IEEE 14 bus system using the Fast Decoupled method in MATLAB. The Fast Decoupled method calculates voltage magnitude and phase angle as well as active and reactive power for each bus through an iterative process. The results show that the Fast Decoupled method requires fewer iterations and less computation time than traditional methods for solving load flow problems, making it preferable for analysis of distribution systems.
Power systems can be modeled and analyzed using per-unit representations of components. Key models include:
1) Generator models that specify real and reactive power injection or terminal voltage and current.
2) Transformer models using an equivalent circuit with magnetizing reactance and resistance.
3) Load models like constant impedance, current, or power to represent different load characteristics.
4) Transmission lines modeled as series impedances.
The per-unit system allows analysis of different voltage levels on a common scale and simplifies modeling of components.
This document contains a practical work book for a power system analysis course. It includes 10 experiments on topics like analysis of three phase star and delta connected systems under balanced and unbalanced loads, demonstration of the single phase equivalent of a three phase star connected network, simulation of three phase short circuits using MATLAB, selection of circuit breakers for three phase faults, and analysis of transients in power systems. The experiments are designed to help students learn and apply concepts related to power system modeling, analysis, and protection.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
This document describes a study of load frequency control (LFC) for a three area power system with time delays using PI and fuzzy logic controllers. The system consists of two areas connected by HVDC transmission links and one area connected to the other by an AC tie line. Models are presented for the generating units, interconnected system, and tie line power flow. The goal is to minimize transient frequency deviations and steady state errors in each area caused by load changes using the different controllers while accounting for time delays in the system.
The Impact of Line Resistance on the Performance of Controllable Series Compe...Editor Jacotech
In recent years controllable FACTS devices are increasingly
integrated into the transmission system. FACTS devices that
provide series control such as Controllable Series Compensator
(CSC) has significant effect on the voltage stability of Electric
Power system. In this work impact of line resistance on the
performance of CSC in a single-load infinitive-bus (SLIB)
model is investigated. The proposed framework is applied to
SLIB model and obtained results demonstrates that line
resistance has considerable effect on voltage stability limits and
performance of CSC.
A Review on Performance Analysis of Matrix Converter Fed AC Motor DriveIAES-IJPEDS
This paper presents a review on the analysis of characteristics that determines
the performance of the Matrix Converter (MC) fed AC motor drive. Review
is made based on the analysis of the different characteristics achieved in the
literature. Different characteristic parameters considered in this paper are
total harmonic distortion, common mode voltage, voltage transfer ratio and
efficiency. Comparison and analysis of these characteristic parameters is
done based on various semi conductor switches, topology, and control and modulation techniques.
Neural Network based p-q-r Theory for Harmonic Reduction and Neutral Current ...IJECEIAES
This document presents a neural network (NN) based p-q-r control strategy for a distributed static synchronous compensator (DSTATCOM) in a three-phase four-wire (3P4W) distribution system. The DSTATCOM integrates a three-phase four-leg voltage source converter with a DC capacitor. The control strategy uses two artificial neural network controllers - one to calculate reference signals for the three-phase three-wire shunt active power filter, and another to produce reference signals for the single-phase active power filter to mitigate neutral current under unbalanced conditions. Simulation results in MATLAB/Simulink validate the effectiveness of the NN based control algorithm in reducing total harmonic distortion, compensating reactive power
Convergence analysis of the triangular-based power flow method for AC distribu...IJECEIAES
This paper addresses the convergence analysis of the triangular-based power flow (PF) method in alternating current radial distribution networks. The PF formulation is made via upper-triangular matrices, which enables finding a general iterative PF formula that does not require admittance matrix calculations. The convergence analysis of this iterative formula is carried out by applying the Banach fixed-point theorem (BFPT), which allows demonstrating that under an adequate voltage profile the triangular-based PF always converges. Numerical validations are made, on the well-known 33 and 69 distribution networks test systems. Gauss-seidel, newton-raphson, and backward/forward PF methods are considered for the sake of comparison. All the simulations are carried out in MATLAB software.
Dynamic Power Factor Correction in a Non Linear Environmentiosrjce
Electric power quality mainly refers to maintaining a near sinusoidal power distribution bus voltage
at rated magnitude and frequency. In modern electric power supply distribution systems, there is a sharp rise in
use of both single phase and three-phase non-linear loads and due to these non-linear loads, non-sinusoidal
unbalanced current is drawn from ac mains resulting in harmonic injection, burden of reactive power, more
neutral currents and unbalanced loading of ac mains. In this paper the simulation of ideal shunt active power
filter is carried out to eliminate harmonics and also improving the power factor for three-phase, three-wire
system. In addition to this, simulation of shunt APF for three-phase, three-wire distribution system using time
domain p-q theory has been carried out to eliminate harmonics. Also an attempt is made to find out various
power quality problems and among these problems most prominent and frequently occurring problem
harmonics is analyzed and its causes, effects and mitigating or improving techniques are explained in detail. A
case study using ideal shunt AF and Shunt AF using p-q theory is also carried out in this paper.
This document presents a voltage stability-based approach for distributed generation (DG) placement in distribution networks. It discusses tools for voltage stability analysis including P-V curves, V-Q curves, modal analysis, and continuous power flow methods. The proposed DG placement algorithm uses modal analysis to identify critical modes and buses, and continuous power flow to determine the most voltage sensitive bus. DGs are then placed at candidate buses to maximize loading and improve voltage stability metrics like voltage security margin, loss reduction, and voltage profile. The method is demonstrated on the 33-bus test system, showing improvements in these indices with DG placement.
A Study on Video Steganographic Techniquesijceronline
Data hiding techniques have taken important role with the rapid growth of intensive transfer of multimedia content and secret communications. The method of Steganography is used to share the data secretly and securely. It is the science of embedding secret information into the cover media with the modification to the cover image, which cannot be easily identified by human eyes. Steganography algorithms can be applied in audio, video and image file. Hiding secret information in video file is known as video steganography. Video Steganography means hiding a secret message that can be either a secret text message or an image within a larger one in such a way that just by looking at it, an unwanted person cannot detect the presence of any hidden message. For hiding secret information in the video, there are many Steganography techniques which are further explained in this paper along with some of the research works done in some fields under video steganography by some authors. The paper describes the progress in the field of video Steganography and intends to give the comparison between its different uses and techniques
Rocker arms are part of the valve-actuating mechanism. A rocker arm is designed to pivot on a pivot
pin or shaft that is secured to a bracket. The bracket is mounted on the cylinder head. One end of a
rocker arm is in contact with the top of the valve stem, and the other end is actuated by the camshaft.
In installations where the camshaft is located below the cylinder head, the rocker arms
are actuated by pushrods. The lifters have rollers which are forced by the valve springs to follow the
profiles of the cams. Failure of rocker arm is a measure concern as it is one of the important
components of push rod IC engines.Present work finds the various stresses under extreme load
condition. For this we are modeling the arm using design software and the stressed regions are
found out usingAnsys software. Here in this thesis we are observing that by changing different
materials how the stresses are varying in the rocker arm under extreme load condition. And after
comparing results we are proposing best suitable material for the rocker arm under extreme load conditions.
Study on groundwater quality in and around sipcot industrial complex, area cu...ijceronline
STATE INDUSTRIES PROMOTION CORPORATION OF TAMIL NADU(SIPCOT) cuddalore phase 1 has estabilished in 1984 at an extent of 518.79 acres. currently between 26 and 29 functional units are lie within phase1 of the industrial estates.At least 10 villages lie within or in the vicinity of the industrial complex. Till date no sites has been developed for secure storage of hazardous wastes generated by the industries in the estate. In absence of such facilities factories have dumped these wastes on neighbouring lands and in open pits. By the industries own admission,out of the 20 million litres of fresh water required by the companies, 18 million litres (90%) of the water is released back to their environment as toxic effluents.These poisons have leached into the ground water and contaminated the water resources of communities living around the factory. This study was carried out to asses the Quality of ground water in and around SIPCOT industrial complex in cuddalore district. The Quality was assessed in terms of physico chemical parameters.Ground water samples were collected from 30 locations in and around the study area and analyzed (APHA,1998) to know the present status of the Ground water Quality. The results were compared with standards prescribed by ISI 10500-91.It was found that the ground water was contaminated at few sampling locations.The remaining locations shows that the parameters are within the desirable limits and fit for drinking purpose
Development of a Cassava Starch Extraction Machineijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Strong (Weak) Triple Connected Domination Number of a Fuzzy Graphijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
This document summarizes a study on modelling and automating a Controllable Network Transformer (CNT). The CNT augments an existing load tap-changing transformer with an AC chopper to control voltage magnitude and phase angle. The study models the CNT using MATLAB and automates its response to system voltage variations. Simulation results demonstrate the CNT's ability to dynamically control output voltage between taps by varying the chopper's pulse width. An automatic tap and pulse selector subsystem chooses the appropriate tap and pulse width based on the required voltage. The automated CNT model proves CNT is a valuable solution for future grid network links by providing flexible voltage matching and bidirectional power flow control.
IRJET- Analysis of Open Loop Distribution Static Compensator for Improvin...IRJET Journal
This document discusses the analysis and simulation of an open loop distribution static compensator (D-STATCOM) for improving power quality in a distribution system. Key points:
1. A D-STATCOM model is developed in MATLAB Simulink to compensate for reactive power demand from nonlinear and unbalanced loads, improve source power factor, and reduce total harmonic distortion in source currents.
2. Simulation results show that before compensation, source currents are unbalanced and distorted due to nonlinear loads. The D-STATCOM is able to maintain unity power factor at the source and mitigate harmonics after compensation.
3. Operating modes of the D-STATCOM include reactive power compensation to regulate voltage, and active power compensation
The document describes two improved direct torque control (DTC) methods for a three-level inverter-fed induction motor drive. Method I selects voltage vectors based on torque and flux demands while inserting intermediate vectors to ensure neutral point balance and smooth switching. Method II uses discrete space vector modulation to synthesize vectors, decoupling vector selection from circuit limitations and solving neutral point and switching issues. Both methods were validated through MATLAB simulation and experiments to enhance DTC performance for three-level inverters while considering their unique challenges.
Artificial Intelligence Technique based Reactive Power Planning Incorporating...IDES Editor
This document summarizes a research paper that proposes using artificial intelligence techniques and FACTS controllers for reactive power planning in real-time power transmission systems. The paper formulates the reactive power planning problem and incorporates flexible AC transmission system (FACTS) devices like static VAR compensators (SVC), thyristor controlled series capacitors (TCSC), and unified power flow controllers (UPFC). Evolutionary algorithms like evolutionary programming (EP) and differential evolution (DE) are applied to find the optimal locations and settings of the FACTS controllers to minimize losses and costs. Simulation results on IEEE 30-bus and 72-bus Indian test systems show that UPFC performs best in reducing losses compared to SVC and TCSC.
INTRODUCTION BASIC TECHNIQUES TYPE OF BUSES
Y BUS MATRIX POWER SYSTEM COMPONENTS BUS ADMITTANCE MATRIX
Power (Load) flow study is the analysis of a power system in normal steady-state operation
This study will determine:
Line Losses in the 14-Bus Power System Network using UPFCIDES Editor
Controlling power flow in modern power systems
can be made more flexible by the use of recent developments
in power electronic and computing control technology. The
Unified Power Flow Controller (UPFC) is a Flexible AC
transmission system (FACTS) device that can control all the
three system variables namely line reactance, magnitude and
phase angle difference of voltage across the line. The UPFC
provides a promising means to control power flow in modern
power systems. Essentially the performance depends on proper
control setting achievable through a power flow analysis
program. This paper presents a reliable method to meet the
requirements by developing a Newton-Raphson based load
flow calculation through which control settings of UPFC can
be determined for the pre-specified power flow between the
lines. The proposed method keeps Newton-Raphson Load Flow
(NRLF) algorithm intact and needs (little modification in the
Jacobian matrix). A MATLAB program has been developed to
calculate the control settings of UPFC and the power flow
between the lines after the load flow is converged. Case studies
have been performed on IEEE 5-bus system and 14-bus system
to show that the proposed method is effective. These studies
indicate that the method maintains the basic NRLF properties
such as fast computational speed, high degree of accuracy and
good convergence rate.
IRJET- Load Flow Analysis of IEEE 14 Bus Systems in Matlab by using Fast Deco...IRJET Journal
The document presents a simulation of load flow analysis for the IEEE 14 bus system using the Fast Decoupled method in MATLAB. The Fast Decoupled method calculates voltage magnitude and phase angle as well as active and reactive power for each bus through an iterative process. The results show that the Fast Decoupled method requires fewer iterations and less computation time than traditional methods for solving load flow problems, making it preferable for analysis of distribution systems.
Power systems can be modeled and analyzed using per-unit representations of components. Key models include:
1) Generator models that specify real and reactive power injection or terminal voltage and current.
2) Transformer models using an equivalent circuit with magnetizing reactance and resistance.
3) Load models like constant impedance, current, or power to represent different load characteristics.
4) Transmission lines modeled as series impedances.
The per-unit system allows analysis of different voltage levels on a common scale and simplifies modeling of components.
This document contains a practical work book for a power system analysis course. It includes 10 experiments on topics like analysis of three phase star and delta connected systems under balanced and unbalanced loads, demonstration of the single phase equivalent of a three phase star connected network, simulation of three phase short circuits using MATLAB, selection of circuit breakers for three phase faults, and analysis of transients in power systems. The experiments are designed to help students learn and apply concepts related to power system modeling, analysis, and protection.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
This document describes a study of load frequency control (LFC) for a three area power system with time delays using PI and fuzzy logic controllers. The system consists of two areas connected by HVDC transmission links and one area connected to the other by an AC tie line. Models are presented for the generating units, interconnected system, and tie line power flow. The goal is to minimize transient frequency deviations and steady state errors in each area caused by load changes using the different controllers while accounting for time delays in the system.
The Impact of Line Resistance on the Performance of Controllable Series Compe...Editor Jacotech
In recent years controllable FACTS devices are increasingly
integrated into the transmission system. FACTS devices that
provide series control such as Controllable Series Compensator
(CSC) has significant effect on the voltage stability of Electric
Power system. In this work impact of line resistance on the
performance of CSC in a single-load infinitive-bus (SLIB)
model is investigated. The proposed framework is applied to
SLIB model and obtained results demonstrates that line
resistance has considerable effect on voltage stability limits and
performance of CSC.
A Review on Performance Analysis of Matrix Converter Fed AC Motor DriveIAES-IJPEDS
This paper presents a review on the analysis of characteristics that determines
the performance of the Matrix Converter (MC) fed AC motor drive. Review
is made based on the analysis of the different characteristics achieved in the
literature. Different characteristic parameters considered in this paper are
total harmonic distortion, common mode voltage, voltage transfer ratio and
efficiency. Comparison and analysis of these characteristic parameters is
done based on various semi conductor switches, topology, and control and modulation techniques.
Neural Network based p-q-r Theory for Harmonic Reduction and Neutral Current ...IJECEIAES
This document presents a neural network (NN) based p-q-r control strategy for a distributed static synchronous compensator (DSTATCOM) in a three-phase four-wire (3P4W) distribution system. The DSTATCOM integrates a three-phase four-leg voltage source converter with a DC capacitor. The control strategy uses two artificial neural network controllers - one to calculate reference signals for the three-phase three-wire shunt active power filter, and another to produce reference signals for the single-phase active power filter to mitigate neutral current under unbalanced conditions. Simulation results in MATLAB/Simulink validate the effectiveness of the NN based control algorithm in reducing total harmonic distortion, compensating reactive power
Convergence analysis of the triangular-based power flow method for AC distribu...IJECEIAES
This paper addresses the convergence analysis of the triangular-based power flow (PF) method in alternating current radial distribution networks. The PF formulation is made via upper-triangular matrices, which enables finding a general iterative PF formula that does not require admittance matrix calculations. The convergence analysis of this iterative formula is carried out by applying the Banach fixed-point theorem (BFPT), which allows demonstrating that under an adequate voltage profile the triangular-based PF always converges. Numerical validations are made, on the well-known 33 and 69 distribution networks test systems. Gauss-seidel, newton-raphson, and backward/forward PF methods are considered for the sake of comparison. All the simulations are carried out in MATLAB software.
Dynamic Power Factor Correction in a Non Linear Environmentiosrjce
Electric power quality mainly refers to maintaining a near sinusoidal power distribution bus voltage
at rated magnitude and frequency. In modern electric power supply distribution systems, there is a sharp rise in
use of both single phase and three-phase non-linear loads and due to these non-linear loads, non-sinusoidal
unbalanced current is drawn from ac mains resulting in harmonic injection, burden of reactive power, more
neutral currents and unbalanced loading of ac mains. In this paper the simulation of ideal shunt active power
filter is carried out to eliminate harmonics and also improving the power factor for three-phase, three-wire
system. In addition to this, simulation of shunt APF for three-phase, three-wire distribution system using time
domain p-q theory has been carried out to eliminate harmonics. Also an attempt is made to find out various
power quality problems and among these problems most prominent and frequently occurring problem
harmonics is analyzed and its causes, effects and mitigating or improving techniques are explained in detail. A
case study using ideal shunt AF and Shunt AF using p-q theory is also carried out in this paper.
This document presents a voltage stability-based approach for distributed generation (DG) placement in distribution networks. It discusses tools for voltage stability analysis including P-V curves, V-Q curves, modal analysis, and continuous power flow methods. The proposed DG placement algorithm uses modal analysis to identify critical modes and buses, and continuous power flow to determine the most voltage sensitive bus. DGs are then placed at candidate buses to maximize loading and improve voltage stability metrics like voltage security margin, loss reduction, and voltage profile. The method is demonstrated on the 33-bus test system, showing improvements in these indices with DG placement.
A Study on Video Steganographic Techniquesijceronline
Data hiding techniques have taken important role with the rapid growth of intensive transfer of multimedia content and secret communications. The method of Steganography is used to share the data secretly and securely. It is the science of embedding secret information into the cover media with the modification to the cover image, which cannot be easily identified by human eyes. Steganography algorithms can be applied in audio, video and image file. Hiding secret information in video file is known as video steganography. Video Steganography means hiding a secret message that can be either a secret text message or an image within a larger one in such a way that just by looking at it, an unwanted person cannot detect the presence of any hidden message. For hiding secret information in the video, there are many Steganography techniques which are further explained in this paper along with some of the research works done in some fields under video steganography by some authors. The paper describes the progress in the field of video Steganography and intends to give the comparison between its different uses and techniques
Rocker arms are part of the valve-actuating mechanism. A rocker arm is designed to pivot on a pivot
pin or shaft that is secured to a bracket. The bracket is mounted on the cylinder head. One end of a
rocker arm is in contact with the top of the valve stem, and the other end is actuated by the camshaft.
In installations where the camshaft is located below the cylinder head, the rocker arms
are actuated by pushrods. The lifters have rollers which are forced by the valve springs to follow the
profiles of the cams. Failure of rocker arm is a measure concern as it is one of the important
components of push rod IC engines.Present work finds the various stresses under extreme load
condition. For this we are modeling the arm using design software and the stressed regions are
found out usingAnsys software. Here in this thesis we are observing that by changing different
materials how the stresses are varying in the rocker arm under extreme load condition. And after
comparing results we are proposing best suitable material for the rocker arm under extreme load conditions.
Study on groundwater quality in and around sipcot industrial complex, area cu...ijceronline
STATE INDUSTRIES PROMOTION CORPORATION OF TAMIL NADU(SIPCOT) cuddalore phase 1 has estabilished in 1984 at an extent of 518.79 acres. currently between 26 and 29 functional units are lie within phase1 of the industrial estates.At least 10 villages lie within or in the vicinity of the industrial complex. Till date no sites has been developed for secure storage of hazardous wastes generated by the industries in the estate. In absence of such facilities factories have dumped these wastes on neighbouring lands and in open pits. By the industries own admission,out of the 20 million litres of fresh water required by the companies, 18 million litres (90%) of the water is released back to their environment as toxic effluents.These poisons have leached into the ground water and contaminated the water resources of communities living around the factory. This study was carried out to asses the Quality of ground water in and around SIPCOT industrial complex in cuddalore district. The Quality was assessed in terms of physico chemical parameters.Ground water samples were collected from 30 locations in and around the study area and analyzed (APHA,1998) to know the present status of the Ground water Quality. The results were compared with standards prescribed by ISI 10500-91.It was found that the ground water was contaminated at few sampling locations.The remaining locations shows that the parameters are within the desirable limits and fit for drinking purpose
Development of a Cassava Starch Extraction Machineijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Strong (Weak) Triple Connected Domination Number of a Fuzzy Graphijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
The Myth of Softening behavior of the Cohesive Zone Model Exact derivation of...ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Engendering sustainable socio-spatial environment for tourism activities in t...ijceronline
The document summarizes a study that assessed the potential for knitting together the five states of South-Eastern Nigeria into a unified tourist destination of international significance. It identifies various tourism potentials across the region and evaluates the accessibility between state capitals. The study recommends adopting an Environmental Planning and Management process involving zonal, state, and local forums to coordinate development efforts and achieve a sustainable tourism environment across the region through public-private collaboration. This participatory approach aims to improve infrastructure like roads, airports, utilities and encourage private investment in tourism facilities.
Stress Analysis of a Centrifugal Supercharger Impeller Bladeijceronline
A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine. This gives each intake cycle of the engine more oxygen, letting it burn
more fuel and do more work, thus increasing power. Power for the supercharger can be provided mechanically by means of a belt, gear, shaft, or chain connected to the engine's crankshaft. Superchargers are a type of forced induction system. They compress the air flowing into the engine.
The advantage of compressing the air is that it lets the engine squeeze more air into a cylinder, and more air means that more fuel can be added. Therefore, you get more power from each explosion in each cylinder. Here in this project we are designing the compressor wheel by using Pro-E and doing
analysis by using FEA package. An attempt has been made to investigate the effect of pressure and induced stresses on the blade. By identifying the true design feature, the extended service life and long term stability is assured. A
structural analysis has been carried out to investigate the stresses, strains and displacements of the blade. An attempt is also made to suggest the best material for an blade of a turbocharger by comparing the results obtained for different materials. Based on the results best material is recommended for the blade of a turbocharger
Performance Improvement of the Radial Distribution System by using Switched C...idescitation
Distribution system is the major link which provides supply to the consumers
from the high voltage transmission system. The load on the distribution system is not
constant and it changes with respect to time throughout the working period. The voltage
drop and power losses occur in the distribution system mainly depends on the nature of the
load which is applied on the system. The voltage drop and power losses frequently occurs
mainly on those systems which are supplying load to the industrial areas, this is mainly
because of the existence of more reactive power. To overcome these problems shunt
compensation is employed to reduce or suppress those effects to an extent. The main aim of
this paper is to determine the specific value of the shunt capacitance required to achieve the
permissible voltage tolerance limits and maximum percentage of power loss reduction in a
sample two feeder radial distribution system.
This document summarizes the results of a study on identifying the weakest branch in a radial distribution network with composite loads using distributed generation. The study tested the approach on a 33-node, 12.66 kV radial distribution system. The reactive loading index technique was used to identify the weakest branch for various levels of distributed generation placed at the optimal node. It was found that branch 5 was the weakest up to 30% distributed generation capacity, after which branch 27 became the weakest as the distributed generation level increased to 100% of the total load. The results provide guidance on how the weakest branch may change with different amounts of distributed generation on the network.
Optimal Placement of Static Series Voltage Regulator (SSVR) in Distribution S...IJERA Editor
This paper presents optimal placement of Static Series Voltage Regulator (SSVR), for voltage profile improvement and power loss reduction in radial distribution systems under steady state condition. SSVR consists of a series compensator. The series compensator injects the series voltage in quadrature with the branch current in such a way that the receiving end voltage is maintained at desired value (up to 1 p.u). The criteria for selection of optimum location of SSVR are under voltage problem mitigation and loss reduction in the network under steady sate condition. Particle Swam Optimization (PSO) technique is used to find the rating of the device. The proposed model is tested using standard distribution system consisting of 33 nodes
A Novel Distribution System Power Flow Algorithm using Forward Backward Matri...iosrjce
IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
This document presents a novel power flow algorithm for solving load flow in balanced radial distribution systems using a forward-backward matrix method. The algorithm utilizes the topological characteristics of radial distribution networks to directly calculate power flow solutions using a simple matrix multiplication. The bus injection to branch current (BIBC) matrix relates bus current injections to branch currents and is used in the forward-backward sweep method instead of traditional techniques. The method was tested on IEEE 7 bus, 12 bus, and 24 bus test systems and achieved converged solutions in fewer iterations and less time compared to other methods.
This document discusses dynamic power factor correction in a non-linear environment through simulation of an ideal shunt active power filter (APF). It begins with an introduction to power quality problems caused by non-linear loads drawing non-sinusoidal currents. It then describes simulation of an ideal shunt APF for a 3-phase, 3-wire system in MATLAB to eliminate harmonics and improve power factor. Waveforms are presented showing the compensator currents injected to make the source currents harmonic-free. Simulation of a shunt APF using p-q theory is also carried out and waveforms shown demonstrating reactive power supply by the compensator and balanced source currents. The document concludes the shunt APF successfully filters harmonics
The document discusses key concepts in per unit representation systems for power systems analysis. It defines per unit values as the ratio of an actual value to a base value, and explains that per unit systems simplify analysis by eliminating factors of √3 and 3. The document also outlines advantages of per unit systems like providing relative magnitude information, simplifying analysis with different voltage levels/transformer ratios, and allowing assumed values when specific data is unavailable. Base values are needed to convert different components to common reference values for unified analysis of the entire power system.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
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Online Voltage Stability Analysis using Synchrophasor Technologyijsrd.com
Voltage instability has been a major problem in all the emerging power systems across the world. Several instances of blackouts in North America, including the 1996 Western Interconnection and the 2003 North East US /Canada blackout are primarily due to voltage collapse. So Monitoring and maintaining voltage stability in real-time is extremely important for operating a power system reliably. In this paper Synchrophasor technology is introduced. Synchrophasor technology has the capability to monitor voltage stability over a wide area in real time. In this paper different methods are introduced for finding the voltage collapse point in the system and also one new method given for identification of voltage collapse point.
This document presents an approach for selecting optimal locations for Unified Power Flow Controllers (UPFCs) in an electrical transmission system considering normal operating conditions and network contingencies. It uses a fuzzy logic controller to evaluate the severity of potential contingencies based on post-contingency voltage profiles, voltage stability indices, and real and reactive power flows. The locations of UPFCs are selected to improve system security and optimize power flow based on contingency severity rankings. The proposed approach is tested on the IEEE 14-bus test system.
IJERD(www.ijerd.com)International Journal of Engineering Research and Develop...IJERD Editor
This document presents an approach for selecting optimal locations for Unified Power Flow Controllers (UPFCs) in an electrical transmission system considering normal operating conditions and network contingencies. It uses a fuzzy logic controller to evaluate the severity of potential contingencies based on post-contingency voltage profiles, voltage stability indices, and real and reactive power flows. The locations of UPFCs are selected to improve system security and optimize power flow based on contingency severity rankings. The proposed approach is tested on the IEEE 14-bus test system.
OPTIMAL SITING AND SIZING OF D-STATCOM USING PARTICLE SWARM OPTIMIZATIONIRJET Journal
This document discusses optimal siting and sizing of D-STATCOM using particle swarm optimization to improve voltage profile and reduce losses in distribution systems. It first describes the problem of power losses and low voltages in distribution networks. It then outlines the methodology used, which is to apply a particle swarm optimization algorithm to determine the optimal location and size of D-STATCOM devices in the test systems (IEEE 12 and 34 bus systems and a 110/11kV substation) to minimize losses while maintaining voltage limits. The results show that placing D-STATCOMs at optimized locations and sizes found by the algorithm reduces total power losses and improves the voltage profile in the different test systems.
IRJET-Power Flow & Voltage Stability Analysis using MATLAB IRJET Journal
This document presents a MATLAB program for power flow analysis and voltage stability analysis of power systems. It begins with an introduction to power flow analysis and its importance. It then discusses voltage stability concepts like voltage collapse and improvement methods. The methodology section describes the Newton-Raphson power flow method and P-V and Q-V curves used for voltage stability analysis. It also provides the algorithm and case study details for the IEEE 14 bus system implemented in MATLAB. The program allows for power flow solutions, calculation of P-V and Q-V curves, and voltage stability assessment of power systems.
Power Flow & Voltage Stability Analysis using MATLAB IRJET Journal
This document presents a MATLAB program for power flow analysis and voltage stability analysis of power systems. It begins with an introduction to power flow analysis and its importance. It then discusses voltage stability concepts like voltage collapse and improvement methods. The methodology section describes the Newton-Raphson power flow method and P-V and Q-V curves used for voltage stability analysis. It also provides the algorithm and case study details for the IEEE 14 bus system implemented in MATLAB. The program allows for power flow solutions, calculation of P-V and Q-V curves, and voltage stability assessment of power systems.
This document contains the question bank for the subject EE 1351 Power System Analysis. It includes 18 multiple choice and numerical questions related to modeling components of a power system including generators, transmission lines and transformers. It also covers per-unit calculations, impedance and reactance diagrams, bus admittance matrices, symmetrical components and power flow analysis. Sample questions are provided on determining the per-unit impedances of components, drawing equivalent circuits, calculating sequence impedances and modeling various elements for power flow studies.
This document proposes an artificial neural network and fuzzy logic controller tool for online voltage stability monitoring and estimating reactive power (VAR) support needs in deregulated power systems. The tool uses bus voltage angles and reactive power loads as inputs to the ANN, which then outputs the voltage stability margin and voltage stability factor of the most vulnerable bus. The ANN is trained offline using patterns from continuation power flow simulations. The tool can estimate stability margins and determine minimum VAR support for different system conditions and contingencies in deregulated markets. It has been tested on IEEE 14 bus and 30 bus systems.
Transient Stability Analysis of IEEE 9 Bus System in Power World SimulatorIJERA Editor
It is widely accepted that transient stability is an important aspect in designing and upgrading electric power
system.
The objective of this paper was to investigate and understand the stability of power system
In this paper, modelling and transient stability analysis of IEEE 9 bus system was performed using POWER
WORLD SIMULATOR. The load flow studies were performed to determine pre-fault conditions in the system
using Newton-Raphson method. With the help of three-phase balanced fault, the variations in power angle and
frequency of the system were studied. Frequency is a reliable indicator if deficiency condition in the power
systems exists or not. For three-phase balanced fault, fast fault clearing time was analysed to bring back the
system to the stability. Further, comparison between Runga method and Euler method for better results was
performed. Hence, impact of load switching on system was also computed so as to bring system to steady state.
Transient Stability Analysis of IEEE 9 Bus System in Power World SimulatorIJERA Editor
It is widely accepted that transient stability is an important aspect in designing and upgrading electric power
system.
The objective of this paper was to investigate and understand the stability of power system
In this paper, modelling and transient stability analysis of IEEE 9 bus system was performed using POWER
WORLD SIMULATOR. The load flow studies were performed to determine pre-fault conditions in the system
using Newton-Raphson method. With the help of three-phase balanced fault, the variations in power angle and
frequency of the system were studied. Frequency is a reliable indicator if deficiency condition in the power
systems exists or not. For three-phase balanced fault, fast fault clearing time was analysed to bring back the
system to the stability. Further, comparison between Runga method and Euler method for better results was
performed. Hence, impact of load switching on system was also computed so as to bring system to steady state.
3.application of upfc in multi machine system for transient stability improve...EditorJST
The stability of an interconnected power system is compare to normal or stable operation after having been subjected to some form of disturbance. With interconnected systems continually growing in size and extending over vast geographical regions, it is becoming increasingly more difficult to maintain synchronism between various parts of the power system. This paper investigates the comparison of transient stability limit of a multi-machine power system with the help of a UPFC operated in perpendicular voltage control mode and their it’s comparison.
Similar to International Journal of Computational Engineering Research (IJCER) (20)
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International Journal of Computational Engineering Research (IJCER)
1. International Journal of Computational Engineering Research||Vol, 03||Issue, 7||
||Issn 2250-3005 || ||July||2013|| Page 13
Incorporation of Dstatcom in Radial Distribution Systems
1,
K. Nirmala, 2,
N. Poorna Chandra Rao
1,
PG Student, Dept.of EEE SVPCET, Puttur, Chittoor Dist., A.P., India,
2,
Associate Professor, Dept.of EEE SVPCET, Puttur, Chittoor Dist., A.P., India
I. NOMENCLATURE
Active and Reactive sending end power respectively
Active and Reactive receiving end power
, Sending end and Receiving end voltage
Proposed voltage stability indicator
Existing indicator
Active and Reactive power losses respectively
II. INTRODUCTION
In recent days, there is a growing interest in operation and control of distribution networks. The most of
the distributionsystems are radial in nature. The Radial distribution networks [2,4,8, 9] having a combination of
industrial, commercial,residential and lightning loads are generally weak in nature because of high resistance to
reactance ratio.The Voltage stability is an important factor to be considered in power system operation and
planning since voltage instability would lead to system collapse. The problem of voltage stability [4]
has been defined as inability of the power system to provide the reactive power or non-uniform
consumption of reactive power bythe system itself. So, the voltage stability is a major concern in planning
and assessment of security of large power systems in contingency situation, especially in developing
countries because of non -uniform growth of load demand in the reactive power management side [3].
The loads generally play a key role in voltage stability analysis. So, the voltage stability is known as load
stability.
The radial distribution systems have high resistance to reactance ratio, which may cause high
power loss in radial system. In power system, the radial distribution system is one which may suffer from
voltage instability.In this paper a new technique used for determination of voltage stability at load bus. By
using this Voltage Stability indicator, the buses of the system which are weak in nature can be identified
easily. So far much attention was paid on voltage stability analysis of transmission lines, researchers have
paid very little attention to develop a voltage stability indicator for radial distribution systems [1,2,6]. In
case of the radial distribution system,providing demanding power to the entire load while maintaining
voltage magnitude at an acceptable range is one of the major system constraints. There are two principal
conventional means of maintaining voltages at an acceptable range in distribution systems are series
voltage regulators and shunt capacitors. Conventional series voltage regulators are commonly used for
voltage regulation in distribution system [7,8,9]. But these devices cannot generate reactive power and by
its operation only force the source togenerate requested reactive power and they have quite slow response
as these operations are step by step [10].Shunt capacitors can supply reactive power to the system but
they are not capable to generate continuous variable reactive power. Another difficulty associated with the
application of distribution capacitors is the natural oscillatory behavior of capacitors when they are used
ABSTRACT
In this paper presents a method to determine the weakest bus in a radial distribution system. A
unique& novel voltagestability indicator (VSI) can identify the condition of load buses with voltage
collapse point of view.The voltage stability indicator is derived from the voltage equation of radial
distribution system. The weakest bus voltage profile is improved by placing a DSTATCOM. The
DSTATCOM is modeled to supply the required reactive power for compensation and to maintain the
voltage magnitude of the node where DSTATCOM is placed as 1 p.u. The validity of the proposed VSI and
DSTATCOM modeling is examined by a standard 33 bus radial distribution system. The results validate
the proposed VSI and DSTATCOM models in large distribution systems.
.
KEYWORDS: Distribution system,DSTATCOM,load flow, voltage stability, voltage stability indicator (VSI),
Load modelling.
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in the same circuit with inductive components. Which results in the well-known phenomena of
ferroresonance and/or self-excitation of induction machinery [10].
The FACTS devices concept was originally developed for transmission systems, but the similar idea has
been started to be applied to distribution systems. The Distribution STATCOM (D-STATCOM) is a shunt
connected voltage source converter which has been utilized to compensate power quality problems such
as unbalanced load, voltage sag, voltage fluctuation and voltage unbalance. D-STATCOM is also utilized
for the improvement of another aspect of power quality, i.e. voltage compensation in long term.In section 2
presents the derivation of Voltage stability indicator, load flow of radial distribution system and
mathematical modeling of DSTATCOM and in the section3 the VSI and DSTATCOM are tested on a 33
bus radial distribution system and results are analysed. Section 4 summarizes the load modelling process
of different- types load model in distribution systems Section 5 summarizes the main points and results of
the paper.
III. BASIC THEORY
3.1 Mathematical derivation of voltage-stability indicator
The VSI is derived from voltage equation of the radial distribution system. The proposed indicator is
given below considering a line of impedance R+jX is connected between two nodes as shown in the
following Fig.1 where i and j are respectively two nodes of the branch and node I is sending end node[V(i)]
and node j is receiving end node[V(j)]. Therefore, power flow direction is from node i to node j. The load at
node j is{P(j)+jQ(j)}.The impedance of the branch is R(i)+jQ(i) if line shunt admittances are neglected, the
current flowing through the line is given by:
Figure 1: Radial system
(1)
The complex power is given as: S=
(2)
Equating (1) and (2)
[V(i)∠ -V(j)∠ ][V(j)∠-𝜃j]=[P(j)₋jQ(j)][R(i)+jX(i)] (3)
Equating real& imaginary parts of (3) we get
V(i)*V(j)cos( - 𝜃j)-V(j)2
= P(j)*R(i)+Q(j)*X(i) (4)
X(i)*P(j)-R(i)*Q(j) = V(i)*V(j)sin( - 𝜃j) (5)
As in radial distribution systems voltage angles are negligible, hence ( - 𝜃j) 0,equation (4),(5) becomes
V(i)*V(j)-V(j)2
= P(j)*R(i)+Q(j)*X(i) (6)
X(i )= (7)
From equation (6),(7)
V(j)2
-V(i)*V(j)+P(j)R(j)+ = 0 (8)
V(j) 2
-V(i)*V(j)+ = 0 (9)
The roots of equation (6) are real if
V(i) 2
- ≥ 0
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≤0 (10)
VSI= (11)
Hence equation (11) is termed as voltage stability indicator (VSI).For stability of particular
node the value of VSI must be VSI≤1. The range of VSI values is 0<VSI≤1. If the value of VSI
approaches or greater than unity, then that node is highly unstable.
3.2 Load flow technique
In this paper, backward forward sweep load flow technique is used to compute voltages and power
flow for a radial distribution system. Several methods have been developed based on the concept of doing
backward forward sweeps of radial distribution networks [11,12,13].
Forward backward sweep based power flow algorithms generally take advantage of the radial
network topology and consist of forward or backward sweep processes. In these algorithms, forward sweep
is mainly the node voltage calculation from sending end to the far end of the feeder and laterals, and the
backward sweep is primarily the branch current or power summation from far end to sending end of the
feeder and laterals.Thefirst step to perform load flow is to create a matrix M (with columns as nodes and nodes
as branches). For a particular branch (row) the sending end node of a branch is assigned -1 and receiving
end as +1, remaining elements as zero. From that M matrix the column which doesn’t have -1 represents
end node. After identifying all end nodes, the back propagation path from end node to source node must
be identified. After finding end node corresponding row gives the branch attached to it and in this row,
-1 value is identified. Thecorresponding column gives the sending end node to the studied branch. This
process continues until the algorithm reaches a column which has no element equal to 1 this represents
source node. Hence the end nodes and back propagation paths for end nodes are calculated then employ
KVL and KCL to radial distribution system, the power flow algorithms calculate node voltages in forward
and backward processes. The radial part is solved by a straight forward two-step procedure in which
branch currents are first computed (backward sweep) and then bus voltages are updated (forward sweep).
The voltage at node i can be expressed as
V(i) = V(i-1)-I(i)Z(i) (12)
The current at node i can be expressed as
IL= (13)
Branch current can be given as
I(i) = Ii(i)+ (14)
Algorithm for radial distribution system load flow:
[1] Read the distribution system line data& load data.
[2] From the node & branch matrix M.
[3] Get the end nodes& back propagation paths.
[4] Obtain the value of β of equation (14) by calculating the downstream nodes of every node.
[5] Make a flat start by assuming the voltage profile of all buses to be 1 p.u.
[6] Calculate load current IL(i) of each bus using equation (13)
[7] Summation of all the load currents corresponding to the nodes which are downstream to the desired node,
as well as its own node; gives the current injected I(i) at that node.
[8] After calculating the current injected to each bus, calculate the voltage of each bus using equation (12).
[9] Compare the difference between each consecutive voltages values of every node. This gives deviation.
[10] If deviation is less than or equal to tolerance limit,then update new voltage values and go to step 6.Else
display absolute value of voltage and the phase angle.
[11] Stop.
3.3 Mathematical modelling of DSTATCOM
The D-STATCOM is used for voltage regulation in the steady-state condition and can inject only
reactive power to the system. Consequently, Idstat must be kept in quadrature with voltage of the system.
By installing DSTATCOM in distribution system, all nodes voltages, especially the neighboring nodes of
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D-STATCOM location, and branch current of the network, change the steady state condition. The diagram of
buses i and j of the distribution systems, when D-STATCOM is installed for voltage regulation in bus j is
shown in shown Fig.2 -STATCOM location, and branches current of the network,change in the steady-
state condition. The diagram of buses i and j of the distribution systems, when D-STATCOM is installed
for voltage regulation in bus. The phasor diagram of these buses with D-STATCOM placement is shown
in Fig.3. The voltage of bus j changes from Vj to Vjnew after D-STATCOM. For simplicity, the angle of
voltage Vi is assumed tobe zero.
Figure 2: Single line diagram of two buses with DSTATCOM
Figure 3 : Phasor diagram of voltages and currents
V(j)∠ new = Vi∠ ₋(R+jX)IL∠𝜃₋(R+jX)Idsat(∠ new+ /2) (15)
by equating imaginary and real parts the above equation(15) we obtain,
Vjnewcos new= Re(Vi∠ ₋ Re(RIL∠𝜃)+XIdsat sin (∠ new+ /2)-RIdsatcos (∠ new+ /2) (16)
Vjnew sin new= Im(Vi∠ ₋ Im(RIL∠𝜃)+XIdsat cos (∠ new+ /2)-RIdsatsin (∠ new+ /2 (17)
a = Re(Vi∠ ₋ Re(RIL∠𝜃)
b = Im(Vi∠ ₋ Im(RX∠𝜃
c1 = -R, c2 = -X, d = Vjnew x
xx1 = Idsat, x 2 = new
From equations (16), (17)
dcosx2 = a-c1x1sinx1-c2x1cosx2 (18)
dsinx2 = a-c2x1sinx2-c1x1cosx2 (19)
a,b,c1,c2 are constants, we need to calculate x1, x2.
x1 = , x1 = (20)
Considering x=sinx2,Equating above equation(20) we get
( + )x2
+(2k1dc1)x+(d2
- ) = 0 (21)
Where,
= - , = -
The solution of equation (21) is given as,
x = (-2k1dc1± {(2k1dc1) 2
-4( + )(d2
- )}
new= x2 = sin-1 x
Now the injected reactive power and voltage and current at node where is installed given as,
Vjnew = Vjnew∠ new (23)
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Idsat = (∠ new+ /2) (24)
jQstat = VjnewI*dstat (25)
and * denotes conjugate of complex variable.
The DSTATCOM is modeled such that the voltage magnitude of the node where DSTATCOM is
located to set to 1p.u. The phase of the node where DSTATCOM is located is calculated by using equation
(22), and the current flowing in DSTATCOM i.e., Idstat is calculated from equation (24). Finally injected
by DSTATCOM is calculated by equation (25).
Algorithm for radial distribution system load flow with DSTATCOM:
[1] Read the distribution system line data and bus data.
[2] Run the load flow of distribution system as in section 3. Select the candidate bus as in section 2.1
[3] Assume the voltage profile of candidate bus as 1 p.u.
[4] Calculate the injected reactive power of DSTATCOM and phase angle of the candidate bus using
equations
[5] (22), (25).
[6] Update the reactive power and voltage phase angle of compensated bus.
[7] Run the load flow of distribution system with updated reactive power and phase angle of candidate
bus.
[8] Stop.
IV. LOAD MODELLING
A load model in this paper is a mathematical representation of the relationship between power and
voltage, where the power is either active or reactive and the output from the model. The voltage (magnitude
and/or frequency) is the input to the model. The load model could be a static or dynamic load model or a
combination of both. Load models are used for analyzing power system stability problems, such as steady state
stability, transient stability, long term stability and voltage control. It isnot said that the same load model is
appropriate for different stability analysis. In order to obtain a model which is as simple as possible, it is
important to choose a load model structure which is appropriate for the studied problem“For dynamic
performance analysis, the transient and steady-state variation of the load P and Q with changes in bus voltage
and frequency must be modeled” [15]. For power system analysis load can be thought as real and reactive power
launched to lower voltage distribution system at buses represented as network model. Among lots of devices and
appliances being connected to the system and considered as a load, one should include inter relating distribution
systems feeders shunt capacitors, transformers etc. as well as voltage controlling devices or voltage regulators.
The simplest load model is static model. A static load model expresses the characteristics of the load at any
instant of time as algebraic functions of bus voltage magnitude and frequency at that instant. The load modelling
of the active& reactive power is given by
P = P o (V a
) (26)
Q = Q o (V a
) (27)
From equations (26) & (27)
If a = 0 Constant power load model.
a = 1 Constant current load model.
a = 2 Constant impedance load model.
V. RESULTS AND DISCUSSION
With the help of MATLAB program, the effectiveness of the proposed VSI and DSTATCOM
performance is tested on 12.66 KV, 100MVA radial distribution system consisting of 33 buses. The single
linediagram of 33-bus system is shown in figure 4 and its data is given in [11].
FIG.4: Single line diagram of 33-bus distribution system
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The load flow of the 33 bus system is carried out and the voltages at each node and the Voltage Stability
Indicator (VSI) are calculated and results shown in table below:
TABLE1: Bus voltages and VSI values from load flow
BUS
Voltage (p.u.)
without
DSTATCOM
Voltage
Stability
Indicator
Voltage (p.u.)
with
DSTATCOM
at bus 30
1 1.0000 - 1.0000
2 0.9970 0.0003 0.9983
3 0.9830 0.0014 0.9909
4 0.9755 0.0017 0.9885
5 0.9682 0.0008 0.9863
6 0.9498 0.0015 0.9861
7 0.9463 0.0013 0.9831
8 0.9415 0.0050 0.9784
9 0.9352 0.0020 0.9726
10 0.9294 0.0020 0.9671
11 0.9286 0.0004 0.9663
12 0.9271 0.0009 0.9648
13 0.9210 0.0035 0.9591
14 0.9187 0.0028 0.9571
15 0.9173 0.0011 0.9558
16 0.9160 0.0015 0.9546
17 0.9140 0.0026 0.9528
18 0.9134 0.0024 0.9522
19 0.9965 0.0004 0.9978
20 0.9929 0.0041 0.9942
21 0.9922 0.0011 0.9935
22 0.9916 0.0019 0.9929
23 0.9794 0.0014 0.9874
24 0.9727 0.0122 0.9808
25 0.9694 0.0123 0.9775
26 0.9479 0.0004 0.9870
27 0.9453 0.0006 0.9884
28 0.9339 0.0020 1.0005
29 0.9257 0.0038 1.0002
30 0.9222 0.0298 1.0010
31 0.9180 0.0053 1.0005
32 0.9171 0.0024 1.0097
33 0.9168 0.0009 1.0095
From the TABLE 1, it is noticed that the bus 30 has the highest value of VSI. Hence Bus 30 is
considered to be the weak bus. And also bus 18 has the lowest voltage. The upper and lower limit of
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voltage magnitudes are 0.95 p.u. and 1.05 p.u. 21 out of 33 nodes have under voltage or over voltage
problem when thereis no DSATACOM installed.
In order to improve the voltage profile of the system the DSTATCOM is placed at the weak bus
30. DSTATCOM is modeled such that it injects the required reactive power to maintain the voltage at 1
p.u. at the node where it is connected and improve voltage profile of other nodes. The load flow is carried
out after placingDSTATCOM at node 30. TABLE 1 shows that after DSTATCOM improves the voltage of
all the nodes having under voltage problems in distribution system. The result shows that the
DSTATCOM installation in this node strongly improves the voltage of neighboring nodes.
TABLE 2: Active power loss ofdistribution system with&without DSTATCOM
Without
DSTATCOM
With DSTATCOM
at bus 30
Size of
DSTATCOM
(MVA)
- 3.386 MVAR
No. buses with
under or over 21 0
Total Active Power
losses (kw) 201.8925 143.0350
% loss reduction - 29.15%
TABLE 2 shows the total Active power loss without DSTATCOM is 201.8925 KW, when DSTATCOM is
placed at bus 30 the active power losses are reduced by 58.8575 KW. The active power loss reduction
after DSTATCOM placement is 29.15%. The results in TABLE 1 and 2 are achieved based on
assumption that DSTATCOM has no capacity limit for reactive power injection to voltage compensation.
And the size of DSTATCOM installed at bus 30 is 3.386 MVA. In the below fig.5 shows the bus voltages in
p.u. corresponding to with & without applying 3MVAR DSTATCOM at bus 30.
FIG.5: Voltages of with and without 3 MVAR
DSTATCOM at bus 30
The below fig.6 shows the active power losses of the with& without placing 3MVAR DSATCOM at bus 30
FIG.6: Active power losses of the with and without
3MVAR DSTATCOM at bus 30
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IV. CONCLUSION
From the above simulation results, it is observed that node 30 has the highest value of VSI which is the
weakest bus of 33 bus radial distribution system. Hence the DSTATCOM is placed at the weakest bus. After
the placement of DSTATCOM the voltage profile of all the buses is improved. The DSTATCOM is
modeled such that it maintains voltage 1 p.u. at the bus where it is installed. Hence the voltage profile of the
system is improved and system losses are minimized. As an extension of the work, the load multiplier factor
may be increased and check the VSI performance.The DSTATCOM in this paper is modeled for fixed
voltage and no capacity limit which may result in high MVA ratings. So, our proposed idea for estimation
of voltage stability indicator is good method for the operating personal to bring back the voltage level
within the estimated range. The proposed estimation method is helpful in power system voltage stability
limit in post contingency conditions.
REFERENCES
[1] T.K.Abdul, G.B.Jasmon “A New Technique for Voltage Stability Analysis in a Power system & Improved Load Flow Algorithmfor
Distribution Network”. IEEE Catalogue no 95TH8130.
[2] Chanda, S.; Das, B.; , "Identification of weak buses in a power network using novel voltage stability indicator in radial distribution
system," International Conference on Power Electronics (IICPE), 2010 India, vol., no., pp.1-4, 28-30 Jan. 2011doi:
10.1109/IICPE.2011.5728121
[3] Ph.D thesis of Dr. C.K. Chanda on “Global voltage stability indicator index” in 2003,BESU.
[4] H. K. Clark, “New challenges: Voltage stability” IEEE Power Engg Rev, April 1990, pp. 33-37
[5] T. Van Cutsem: “A method to compute reactive power margins with respect to voltage collapse”, IEEE Trans. On Power
Systems,No. 1, 1991
[6] C.K. Chanda, A. Chakraborti,S.Dey, “Development of global voltage security indicator(VSI) and role of SVC on it in longitudinal
[7] power supply(LPS) system”, ELSEVIER(Electrical Power System Research 68),2004, pp.1 -9.
[8] Bishop, M.T., Foster, J.D., Down, D.A., 1994. The Application of Single-phase Voltage Regulators on Three-phase Distribution
Systems. The 38th Annual Conf. on Rural Electric Power, p.C2/1-C2/7.
[9] Gu, Z., Rizy, D.T., 1996. Neural networks for combined control of capacitor banks and voltage regulators in distribution systems.
[10] IEEE Trans. on Power Delivery, 11:1921- 1928. [doi:10.1109/61.544277].
[11] Kojvic, L.A., 2006. Coordination of Distributed Generation and Step Voltage Regulator Operations for Improved Distribution
System Voltage Regulation. IEEE Power Engineering Society General Meeting, p.232-237.
[12] Ramsay, S.M., Cronin, P.E., Nelson, R.J., Bian, J., Menendez, F.E., 1996. Using Distribution Static Compensators (DSTATCOMs)
to Extend the Capability of Voltage-limited Distribution Feeders. The 39th Annual Conf. on Rural Electcic power, p.18-24
[13] Haque, M.H., 2001. Compensation of Distribution System Voltage Sag by DVR and D-STATCOM. IEEE Porto Power Tech.Conf.,
1(5):223-228.
[14] Ghosh, S., Das, D., 1999. Method for load-flow solution of radial distribution networks. IEE Proc.-
Gener.Transm.Distrib.,146(6):641-648. [doi:10.1049/ip-gtd:19990464]
[15] Ma, J., Xu, J., Wang, S., Lin, X., 2002. Calculation and Analysis for Line Losses in Distribution Network. Int. Conf. on Power
System Technology, p.2537-2541.
[16] Baran, M.E., Wu, F.F., 1989b. Network reconfiguration in distribution systems for loss reduction and load balancing. IEEE
Trans.on Power Delivery, 4(2):1401-1407
[17] M. Sedighizadeh, and A. Rezazadeh, “Load
[18] Modeling for Power Flow and Transient Stability Computer Studies at BAKHTAR Network”
Authors:
K.NIRMALA
Pursuing PG degree in Electrical power systems at SVPCET, Affiliated to JNTUA, RVS Nagar, puttur,(AP).
N.POORNACHANDRA RAO
Associate professor in department of EEE, SVPCET, Affiliated to JNTUA, RVS Nagar, puttur, (AP).