1) The VFT is a variable frequency transformer that can transfer power between asynchronous power systems by controlling the magnitude and direction of power flow. It functions similar to a conventional induction machine, with power systems connected to the stator and rotor windings.
2) Power flow is controlled by applying a torque to the rotor via a drive motor, which adjusts the rotor position relative to the stator. In one direction of torque, power flows from the stator to the rotor, and vice versa with opposite torque.
3) MATLAB simulation models the VFT as a wound rotor induction machine to study power transfer under different torque conditions between two asynchronous power systems of different voltages and frequencies.
Modeling, Analysis and Simulation of VFT for Power Flow Control through Async...IDES Editor
Variable Frequency Transformer (VFT) is a
controllable bi-directional transmission device that can
transfer power between asynchronous networks. It avoids both
HVDC link and FACTS based power transmission control
system. Basically, it is a rotatory transformer whose torque is
adjusted in order to control the power flow. In this paper, a
simulated model of VFT is used as a controllable bidirectional
power transmission device that can control power flow through
the connected asynchronous power systems. A simulation
model of VFT and its control system models are developed
with MATLAB and a series of studies on power flow through
asynchronous power systems are carried out with the model.
The response characteristics of power flow under various
torque conditions are discussed. The voltage, current, torque
and power flow plots are also obtained.
Digital Simulation of VFT Applications between Power System Networksidescitation
The document discusses a digital simulation of variable frequency transformer (VFT) applications between power system networks. A VFT is a rotary transformer that can transfer power between asynchronous power grids by controlling the torque applied to its rotor. The paper presents a digital simulation model of a VFT and its control system developed in MATLAB Simulink. Simulation studies are carried out to analyze power transfer under various torque conditions. Waveforms are obtained showing voltage, current, torque and power transfer to verify the VFT concept and applications.
A variable frequency transformer (VFT) is being installed at AEP's Laredo substation to exchange up to 100 MW of power between the asynchronous power grids of ERCOT (Texas) and CFE (Mexico). The VFT functions similarly to a back-to-back HVDC converter. It uses a rotary transformer with rotor and stator windings to control power flow through rotational adjustment. Additional control features for the Laredo VFT include tie flow regulation, power runback, reactive power control, and black start capability. The document describes the VFT application and provides simulation results of its performance during grid disturbances.
This paper presents a method to improve transient stability and damping of low frequency oscillations in a multi-machine power system using adaptive neuro-fuzzy control of FACTS devices. A Simulink model of a three generator power system equipped with a UPFC is developed. Simulation results show that a UPFC controlled using an adaptive neuro-fuzzy inference system controller more effectively improves transient stability and damps power oscillations compared to using SSSC. The neuro-fuzzy controller is trained using a hybrid learning algorithm to tune its parameters online based on generator speed deviation and acceleration as inputs.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Simulation of VFT For Power Transfer Between Two NetworksDeepak Upadhyay
In present scenario, to fulfillment of the world energy demand, the renewable energy resource (RES) like photovoltaic generation systems and wind power generation systems has emerged as the better option and connected to the grid has been increasing as a way of reducing negative effects on the environment. The outputs of these RESs vary rapidly because of the influence of the weather and the conditions of the location. And also synchronization problem is arising due to lot of small RESs generating station. So that, very difficult to transmit asynchronous power on high voltage level. On the other hand due to the significant power demand increase, the transmission line operators are required to increase transmission line power transfer capability. So that to decrease the power losses and improve power transfer capability at high voltage level, HVDC transmission lines is used. But initially the cost of HVDC system is very high for short and medium distance transmission. To overcome this problem and reduce the cost of conventional method a new technology known as variable frequency transformer (VFT) has been developed for transmission interconnections. It is used as a flexible for both synchronous and asynchronous ac links to transfer power between power system networks
report on the GOVERNING CONTROL AND EXCITATION CONTROL FOR STABILITY OF POWER...Yuvraj Singh
This document discusses governing and excitation control for power system stability. It introduces the topic of power system stability and different control techniques used, including PID, linear, and intelligent controls. The main focus is on coordinating governing control and excitation control using neuro-fuzzy systems. A Simulink model is developed to study the dynamic behavior of a synchronous machine and performance of the proposed neuro-fuzzy controller under a 3-phase fault disturbance.
LOW VOLTAGE RIDE - THROUGH CAPABILITY OF WIND FARMSEditor IJMTER
Nowadays wind turbines are generally required to offer ancillary services similar to those
provided by conventional generators. One of the most important services wind turbines must offer is
to stay connected to the grid in fault situations delivering the reactive current specified in the recent
grid codes. In this paper, FACTS solutions for fixed speed wind farms such as DVR (Dynamic
Voltage Restorer) are presented as well as classic control and crowbar solutions for variable speed
wind turbines.
Modeling, Analysis and Simulation of VFT for Power Flow Control through Async...IDES Editor
Variable Frequency Transformer (VFT) is a
controllable bi-directional transmission device that can
transfer power between asynchronous networks. It avoids both
HVDC link and FACTS based power transmission control
system. Basically, it is a rotatory transformer whose torque is
adjusted in order to control the power flow. In this paper, a
simulated model of VFT is used as a controllable bidirectional
power transmission device that can control power flow through
the connected asynchronous power systems. A simulation
model of VFT and its control system models are developed
with MATLAB and a series of studies on power flow through
asynchronous power systems are carried out with the model.
The response characteristics of power flow under various
torque conditions are discussed. The voltage, current, torque
and power flow plots are also obtained.
Digital Simulation of VFT Applications between Power System Networksidescitation
The document discusses a digital simulation of variable frequency transformer (VFT) applications between power system networks. A VFT is a rotary transformer that can transfer power between asynchronous power grids by controlling the torque applied to its rotor. The paper presents a digital simulation model of a VFT and its control system developed in MATLAB Simulink. Simulation studies are carried out to analyze power transfer under various torque conditions. Waveforms are obtained showing voltage, current, torque and power transfer to verify the VFT concept and applications.
A variable frequency transformer (VFT) is being installed at AEP's Laredo substation to exchange up to 100 MW of power between the asynchronous power grids of ERCOT (Texas) and CFE (Mexico). The VFT functions similarly to a back-to-back HVDC converter. It uses a rotary transformer with rotor and stator windings to control power flow through rotational adjustment. Additional control features for the Laredo VFT include tie flow regulation, power runback, reactive power control, and black start capability. The document describes the VFT application and provides simulation results of its performance during grid disturbances.
This paper presents a method to improve transient stability and damping of low frequency oscillations in a multi-machine power system using adaptive neuro-fuzzy control of FACTS devices. A Simulink model of a three generator power system equipped with a UPFC is developed. Simulation results show that a UPFC controlled using an adaptive neuro-fuzzy inference system controller more effectively improves transient stability and damps power oscillations compared to using SSSC. The neuro-fuzzy controller is trained using a hybrid learning algorithm to tune its parameters online based on generator speed deviation and acceleration as inputs.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Simulation of VFT For Power Transfer Between Two NetworksDeepak Upadhyay
In present scenario, to fulfillment of the world energy demand, the renewable energy resource (RES) like photovoltaic generation systems and wind power generation systems has emerged as the better option and connected to the grid has been increasing as a way of reducing negative effects on the environment. The outputs of these RESs vary rapidly because of the influence of the weather and the conditions of the location. And also synchronization problem is arising due to lot of small RESs generating station. So that, very difficult to transmit asynchronous power on high voltage level. On the other hand due to the significant power demand increase, the transmission line operators are required to increase transmission line power transfer capability. So that to decrease the power losses and improve power transfer capability at high voltage level, HVDC transmission lines is used. But initially the cost of HVDC system is very high for short and medium distance transmission. To overcome this problem and reduce the cost of conventional method a new technology known as variable frequency transformer (VFT) has been developed for transmission interconnections. It is used as a flexible for both synchronous and asynchronous ac links to transfer power between power system networks
report on the GOVERNING CONTROL AND EXCITATION CONTROL FOR STABILITY OF POWER...Yuvraj Singh
This document discusses governing and excitation control for power system stability. It introduces the topic of power system stability and different control techniques used, including PID, linear, and intelligent controls. The main focus is on coordinating governing control and excitation control using neuro-fuzzy systems. A Simulink model is developed to study the dynamic behavior of a synchronous machine and performance of the proposed neuro-fuzzy controller under a 3-phase fault disturbance.
LOW VOLTAGE RIDE - THROUGH CAPABILITY OF WIND FARMSEditor IJMTER
Nowadays wind turbines are generally required to offer ancillary services similar to those
provided by conventional generators. One of the most important services wind turbines must offer is
to stay connected to the grid in fault situations delivering the reactive current specified in the recent
grid codes. In this paper, FACTS solutions for fixed speed wind farms such as DVR (Dynamic
Voltage Restorer) are presented as well as classic control and crowbar solutions for variable speed
wind turbines.
The document discusses various methods for improving power system stability, including automatic voltage regulators (AVR), load frequency control (LFC), and power system stabilizers (PSS). AVR works to maintain generator terminal voltage at a preset value by adjusting excitation current. LFC maintains system frequency and power exchange between areas at scheduled values. PSS adds damping to generator oscillations to stabilize the grid by modulating voltage regulator setpoint based on speed.
Efficacy of Facts in Power Oscillation Damping and Renewable IntegrationIOSRJEEE
This document summarizes research on using flexible AC transmission system (FACTS) devices to improve power oscillation damping and facilitate renewable energy integration. It discusses how power oscillations can lead to instability if not controlled and how FACTS devices like STATCOM and SVC can enhance stability. It presents simulations of the IEEE 14-bus system that demonstrate improved damping from these controllers. Eigenvalue analysis shows STATCOM shifts modes further into the stable region than SVC. Both STATCOM and SVC integration helps renewable sources by mitigating power quality issues to allow more distributed generation on the grid.
Transient stability refers to the ability of a power grid to maintain synchronism during severe disturbances. Methods to improve transient stability include increasing generator rotor size, reducing transmission line reactance, using dynamic braking resistors, independent pole operation of circuit breakers, single pole switching, fast excitation control, fast governor action, generator and load tripping, regulated shunt compensation using static VAR devices, HVDC transmission, and increasing the short circuit ratio. The inertia constant of generators also impacts stability but increasing it is not practical due to increased machine size and cost.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses various topics related to power system stability including:
1. It defines power system stability as the ability of a system to regain equilibrium after a disturbance. It classifies stability into rotor angle stability, voltage stability, and frequency stability.
2. Rotor angle stability depends on the balance between electromagnetic and mechanical torque on generators. Voltage stability refers to maintaining steady voltages after a disturbance.
3. It derives and explains the swing equation, which describes the relative motion of a generator rotor during disturbances. It provides the swing equation both with and without damper torque.
4. It discusses single machine infinite bus systems and provides the equivalent circuit diagram. Small-signal angle stability refers to the ability of a system
This document summarizes research into improving transient stability in power transmission systems using a Static VAR Compensator (SVC) with a hybrid PI-Fuzzy Logic controller. It begins with an introduction to Flexible AC Transmission Systems (FACTS) and the role of SVC devices in voltage control and reactive power compensation. It then describes modeling an SVC and the operating principles of conventional PI control. The limitations of PI control for nonlinear systems are discussed. The document proposes a hybrid PI-Fuzzy Logic controller to combine the advantages of both. Simulation results using MATLAB on a 2-machine 3-bus test system show the hybrid controller improves performance during disturbances over PI or Fuzzy Logic control alone.
This document provides an introduction and classification of power system stability, including rotor angle stability, voltage stability, and frequency stability. It defines each type of stability and describes some of the basic phenomena associated with each. Rotor angle stability deals with the ability of synchronous machines to remain in synchronism after a disturbance and includes small-disturbance and transient stability. Voltage stability is defined as the ability to maintain steady state voltages and is affected by the balance between load demand and supply. Frequency stability concerns the ability to maintain steady state frequency following a severe upset.
The document discusses variable frequency drives (VFDs) and their applications. VFDs can control the frequency and voltage applied to AC motors to vary their speed. They allow control of parameters like voltage, frequency, and maximum temperature. Common applications of VFDs include heating, ventilation, air conditioning, wastewater treatment, fans, blowers, textile mills and rolling mills. VFDs provide variable frequency and voltage using voltage source inverters, cycloconverters or choppers to reduce harmonic injection into the AC supply.
The document provides information on power system stability and transient stability studies. It introduces key concepts such as stability, transient stability studies, rotor dynamics, the swing equation, and the power-angle equation. The swing equation describes the acceleration of a generator's rotor and relates the mechanical input power to the electrical output power. The power-angle equation models the relationship between generator output power and the power angle during transient stability studies.
Two identical wound rotor induction machines are connected in a cascaded configuration to transfer power between two asynchronous grids. The stators of each machine are connected to different frequency grids, while the rotors are coupled mechanically and electrically. This allows the rotor fields to rotate at the same frequency, enabling power transfer. Mathematical equations are presented to model the steady-state power flow between the machines based on their electrical characteristics. Simulation results are shown for two identical machines demonstrating this approach can interconnect grids without restrictions on frequency differences.
There are two broad classes of power system stability:
1) Steady state stability - The ability of a system to maintain equilibrium after a small disturbance.
2) Transient stability - The ability to maintain synchronism during large disturbances like faults.
Factors influencing transient stability include generator loading, fault conditions, clearing time, reactances, and inertia. Methods to improve it include high-speed excitation, series capacitors, fault clearing and independent pole operation.
Transient Stability Analysis with SSSC and UPFC in Multi-Machine Power System...IRJET Journal
This document analyzes the transient stability performance of a power system with Flexible AC Transmission Systems (FACTS) controllers like the Static Synchronous Series Compensator (SSSC) and Unified Power Flow Controller (UPFC), with and without Power System Stabilizers (PSS). It compares the effectiveness of a Generic PSS (GPSS) and Multi-Band PSS (MBPSS) at damping oscillations during and after faults. Simulation results on a IEEE three machine system in Matlab/Simulink show that the UPFC provides better transient stability than the SSSC. The MBPSS also proves more effective at damping oscillations than the GPSS.
Transient stability analysis on a multi machine system in psateSAT Journals
Abstract
Modern power system are subject to large disturbances such as three phase short circuit faults. When a fault occurs on a system
the generators rotor angle becomes unstable and thus it losses synchronism with the system and it becomes unstable. Thus
transient stability analysis can be performed on a system in order to understand the generators performance when subjected to a
short circuit fault. When the system is subjected to a fault the generator experiences transient oscillations in rotor speed and
angle which can be effectively suppressed with the incorporation of Automatic Voltage Regulator (AVR) and Power System
Stabilizer (PSS). The simulations have been performed using the MATLAB/PSAT software.
Keywords—Transient stability, Three phase fault Faults, AVR, PSS.
Nonlinear Control of UPFC in Power System for Damping Inter Area OscillationsIJMER
This document summarizes a research paper about using nonlinear control of Unified Power Flow Controllers (UPFCs) to damp inter-area oscillations in power systems. The paper proposes a nonlinear control method where UPFCs can control their interface bus angles to mitigate power system oscillations. The control method develops a reduced nonlinear model of the network and uses selected frequency measurements from a subset of dominant machines as inputs to FACTS controllers. The effectiveness of using this method with UPFCs to damp inter-area oscillations is validated on a test power system.
V/F Control of Squirrel Cage Induction Motor Drives Without Flux or Torque Me...Waqas Tariq
Based on the popular constant volts per hertz principle, two improvement techniques are presented: keeping maximum torque constant or keeping magnetic flux constant. An open-loop inverter-three-phase squirrel-cage induction motor drive system that provides constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency has been modeled, simulated and tested. Load performance analysis of the proposed system under different operation conditions was provided. These principles of operation are extended to the case of operation from variable frequency or variable voltage control method. Finally, the effects of the non-sinusoidal voltage and/or current wave shapes are covered. The results show that both suggested improvement techniques (constant torque or constant flux) improve the steady-state performance A.C. drive system with squirrel cage induction motors. The slip speed has been decreased and the starting torque and maximum torque have been increased, which means that the suggested control techniques can be used in drive systems with short time operating mode under light loads.
Power Flow Control in Power System Using FACT Device Thyristor Controlled Ser...IOSR Journals
This document summarizes a study on using Flexible AC Transmission System (FACTS) devices for power flow control in a power system. Specifically, it models and simulates the use of Thyristor Controlled Series Capacitor (TCSC) and Static VAR Compensator (SVC) in a two-area, four-machine 11-bus test system using MATLAB/Simulink. TCSC is installed between buses 9 and 10 to reduce line reactance and improve power flow. SVC is installed at bus 9 for voltage control. Simulation results show that TCSC and SVC effectively control active and reactive power flows and bus voltages in the system.
1) The document discusses using an SVC (Static Var Compensator) to improve the voltage stability of a grid-connected wind-driven induction generator.
2) An SVC can generate or absorb reactive power to regulate voltage and improve stability. It contains thyristor-controlled reactors and thyristor-switched capacitors to dynamically control reactive power.
3) Simulation results show that an SVC is able to maintain terminal voltage and allow continuous operation when the grid voltage varies, improving stability compared to without an SVC.
Development of Product Configurator for a Pressure Booster SystemIDES Editor
This paper outlines the process of developing a
product configurator for a pressure booster system. The ideas
presented here were developed when developing a configurator
in the CS-Enterprise package for a pressure booster system.
This paper chronicles the design aspects, the configurator
development planning, rule-based configurator development
and testing and validation, including best practices developed
during the process. Further work possible is also discussed.
Performance Analysis of Continuous Flow Intersection in Mixed Traffic Condition IDES Editor
This document summarizes a study that evaluates the performance of a Continuous Flow Intersection (CFI) using computer simulation under mixed traffic conditions. The study compares the average delays of vehicles at a CFI to those at a Normal Flow Intersection (NFI) for different traffic volumes and proportions of right-turning traffic. The results show that the CFI has lower average delays than the NFI for all traffic scenarios tested, with delays reduced by 30-60% on average. The CFI design provides benefits without requiring additional land and can better utilize existing road infrastructure capacity.
The document discusses various methods for improving power system stability, including automatic voltage regulators (AVR), load frequency control (LFC), and power system stabilizers (PSS). AVR works to maintain generator terminal voltage at a preset value by adjusting excitation current. LFC maintains system frequency and power exchange between areas at scheduled values. PSS adds damping to generator oscillations to stabilize the grid by modulating voltage regulator setpoint based on speed.
Efficacy of Facts in Power Oscillation Damping and Renewable IntegrationIOSRJEEE
This document summarizes research on using flexible AC transmission system (FACTS) devices to improve power oscillation damping and facilitate renewable energy integration. It discusses how power oscillations can lead to instability if not controlled and how FACTS devices like STATCOM and SVC can enhance stability. It presents simulations of the IEEE 14-bus system that demonstrate improved damping from these controllers. Eigenvalue analysis shows STATCOM shifts modes further into the stable region than SVC. Both STATCOM and SVC integration helps renewable sources by mitigating power quality issues to allow more distributed generation on the grid.
Transient stability refers to the ability of a power grid to maintain synchronism during severe disturbances. Methods to improve transient stability include increasing generator rotor size, reducing transmission line reactance, using dynamic braking resistors, independent pole operation of circuit breakers, single pole switching, fast excitation control, fast governor action, generator and load tripping, regulated shunt compensation using static VAR devices, HVDC transmission, and increasing the short circuit ratio. The inertia constant of generators also impacts stability but increasing it is not practical due to increased machine size and cost.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
This document discusses various topics related to power system stability including:
1. It defines power system stability as the ability of a system to regain equilibrium after a disturbance. It classifies stability into rotor angle stability, voltage stability, and frequency stability.
2. Rotor angle stability depends on the balance between electromagnetic and mechanical torque on generators. Voltage stability refers to maintaining steady voltages after a disturbance.
3. It derives and explains the swing equation, which describes the relative motion of a generator rotor during disturbances. It provides the swing equation both with and without damper torque.
4. It discusses single machine infinite bus systems and provides the equivalent circuit diagram. Small-signal angle stability refers to the ability of a system
This document summarizes research into improving transient stability in power transmission systems using a Static VAR Compensator (SVC) with a hybrid PI-Fuzzy Logic controller. It begins with an introduction to Flexible AC Transmission Systems (FACTS) and the role of SVC devices in voltage control and reactive power compensation. It then describes modeling an SVC and the operating principles of conventional PI control. The limitations of PI control for nonlinear systems are discussed. The document proposes a hybrid PI-Fuzzy Logic controller to combine the advantages of both. Simulation results using MATLAB on a 2-machine 3-bus test system show the hybrid controller improves performance during disturbances over PI or Fuzzy Logic control alone.
This document provides an introduction and classification of power system stability, including rotor angle stability, voltage stability, and frequency stability. It defines each type of stability and describes some of the basic phenomena associated with each. Rotor angle stability deals with the ability of synchronous machines to remain in synchronism after a disturbance and includes small-disturbance and transient stability. Voltage stability is defined as the ability to maintain steady state voltages and is affected by the balance between load demand and supply. Frequency stability concerns the ability to maintain steady state frequency following a severe upset.
The document discusses variable frequency drives (VFDs) and their applications. VFDs can control the frequency and voltage applied to AC motors to vary their speed. They allow control of parameters like voltage, frequency, and maximum temperature. Common applications of VFDs include heating, ventilation, air conditioning, wastewater treatment, fans, blowers, textile mills and rolling mills. VFDs provide variable frequency and voltage using voltage source inverters, cycloconverters or choppers to reduce harmonic injection into the AC supply.
The document provides information on power system stability and transient stability studies. It introduces key concepts such as stability, transient stability studies, rotor dynamics, the swing equation, and the power-angle equation. The swing equation describes the acceleration of a generator's rotor and relates the mechanical input power to the electrical output power. The power-angle equation models the relationship between generator output power and the power angle during transient stability studies.
Two identical wound rotor induction machines are connected in a cascaded configuration to transfer power between two asynchronous grids. The stators of each machine are connected to different frequency grids, while the rotors are coupled mechanically and electrically. This allows the rotor fields to rotate at the same frequency, enabling power transfer. Mathematical equations are presented to model the steady-state power flow between the machines based on their electrical characteristics. Simulation results are shown for two identical machines demonstrating this approach can interconnect grids without restrictions on frequency differences.
There are two broad classes of power system stability:
1) Steady state stability - The ability of a system to maintain equilibrium after a small disturbance.
2) Transient stability - The ability to maintain synchronism during large disturbances like faults.
Factors influencing transient stability include generator loading, fault conditions, clearing time, reactances, and inertia. Methods to improve it include high-speed excitation, series capacitors, fault clearing and independent pole operation.
Transient Stability Analysis with SSSC and UPFC in Multi-Machine Power System...IRJET Journal
This document analyzes the transient stability performance of a power system with Flexible AC Transmission Systems (FACTS) controllers like the Static Synchronous Series Compensator (SSSC) and Unified Power Flow Controller (UPFC), with and without Power System Stabilizers (PSS). It compares the effectiveness of a Generic PSS (GPSS) and Multi-Band PSS (MBPSS) at damping oscillations during and after faults. Simulation results on a IEEE three machine system in Matlab/Simulink show that the UPFC provides better transient stability than the SSSC. The MBPSS also proves more effective at damping oscillations than the GPSS.
Transient stability analysis on a multi machine system in psateSAT Journals
Abstract
Modern power system are subject to large disturbances such as three phase short circuit faults. When a fault occurs on a system
the generators rotor angle becomes unstable and thus it losses synchronism with the system and it becomes unstable. Thus
transient stability analysis can be performed on a system in order to understand the generators performance when subjected to a
short circuit fault. When the system is subjected to a fault the generator experiences transient oscillations in rotor speed and
angle which can be effectively suppressed with the incorporation of Automatic Voltage Regulator (AVR) and Power System
Stabilizer (PSS). The simulations have been performed using the MATLAB/PSAT software.
Keywords—Transient stability, Three phase fault Faults, AVR, PSS.
Nonlinear Control of UPFC in Power System for Damping Inter Area OscillationsIJMER
This document summarizes a research paper about using nonlinear control of Unified Power Flow Controllers (UPFCs) to damp inter-area oscillations in power systems. The paper proposes a nonlinear control method where UPFCs can control their interface bus angles to mitigate power system oscillations. The control method develops a reduced nonlinear model of the network and uses selected frequency measurements from a subset of dominant machines as inputs to FACTS controllers. The effectiveness of using this method with UPFCs to damp inter-area oscillations is validated on a test power system.
V/F Control of Squirrel Cage Induction Motor Drives Without Flux or Torque Me...Waqas Tariq
Based on the popular constant volts per hertz principle, two improvement techniques are presented: keeping maximum torque constant or keeping magnetic flux constant. An open-loop inverter-three-phase squirrel-cage induction motor drive system that provides constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency has been modeled, simulated and tested. Load performance analysis of the proposed system under different operation conditions was provided. These principles of operation are extended to the case of operation from variable frequency or variable voltage control method. Finally, the effects of the non-sinusoidal voltage and/or current wave shapes are covered. The results show that both suggested improvement techniques (constant torque or constant flux) improve the steady-state performance A.C. drive system with squirrel cage induction motors. The slip speed has been decreased and the starting torque and maximum torque have been increased, which means that the suggested control techniques can be used in drive systems with short time operating mode under light loads.
Power Flow Control in Power System Using FACT Device Thyristor Controlled Ser...IOSR Journals
This document summarizes a study on using Flexible AC Transmission System (FACTS) devices for power flow control in a power system. Specifically, it models and simulates the use of Thyristor Controlled Series Capacitor (TCSC) and Static VAR Compensator (SVC) in a two-area, four-machine 11-bus test system using MATLAB/Simulink. TCSC is installed between buses 9 and 10 to reduce line reactance and improve power flow. SVC is installed at bus 9 for voltage control. Simulation results show that TCSC and SVC effectively control active and reactive power flows and bus voltages in the system.
1) The document discusses using an SVC (Static Var Compensator) to improve the voltage stability of a grid-connected wind-driven induction generator.
2) An SVC can generate or absorb reactive power to regulate voltage and improve stability. It contains thyristor-controlled reactors and thyristor-switched capacitors to dynamically control reactive power.
3) Simulation results show that an SVC is able to maintain terminal voltage and allow continuous operation when the grid voltage varies, improving stability compared to without an SVC.
Development of Product Configurator for a Pressure Booster SystemIDES Editor
This paper outlines the process of developing a
product configurator for a pressure booster system. The ideas
presented here were developed when developing a configurator
in the CS-Enterprise package for a pressure booster system.
This paper chronicles the design aspects, the configurator
development planning, rule-based configurator development
and testing and validation, including best practices developed
during the process. Further work possible is also discussed.
Performance Analysis of Continuous Flow Intersection in Mixed Traffic Condition IDES Editor
This document summarizes a study that evaluates the performance of a Continuous Flow Intersection (CFI) using computer simulation under mixed traffic conditions. The study compares the average delays of vehicles at a CFI to those at a Normal Flow Intersection (NFI) for different traffic volumes and proportions of right-turning traffic. The results show that the CFI has lower average delays than the NFI for all traffic scenarios tested, with delays reduced by 30-60% on average. The CFI design provides benefits without requiring additional land and can better utilize existing road infrastructure capacity.
Comparative Study of Morphological, Correlation, Hybrid and DCSFPSS based Mor...IDES Editor
This paper proposes comparative study of two basic
approaches such as Morphological Approach (MA) and
Correlation Approach (CA) and three modified algorithms
over the basic approaches for detection of micronatured defects
occurring in plain weave fabrics. A Hybrid of CA followed by
MA was developed and has shown to overcome the drawbacks
of the basic methods. As automation of MA using DC
Suppressed Fourier Power Spectrum Sum (DCSFPSS),
DCSFPSSMA could not yield improvement in Overall
Detection Accuracy (ODA) for micronatured defects,
automation of modified Hybrid Approach (HA) was proposed
leading to the development of Tribrid Approach (TA). Modified
Hybrid approach involves cascade operation of CA and MA
both automated using DCSFPSS. Texture periodicity of defect
free fabric was obtained using DCSFPSS which was extended
for the design and extraction of defect independent template
for CA and for the design of the size of structuring element
for morphological filtering process. Overall Detection
Accuracy was used by adopting simple binary based defect
search algorithm as the last step in the experimentation to
detect the defects. Overall Detection Accuracy was found to be
~100%/97.41%/ 98.7 % for 247 samples of warp break defect/
double pick/ normal samples and 96.1% /99% for 205 thick
place defect samples/normal samples belonging to two
different plain grey fabric classes. Robustness of the
performance of TA scheme was tested by comparing TA with
two traditional algorithms viz., CA and MA and our previously
proposed hybrid algorithm and DCSFPSSMA. This TA
algorithm outperformed when compared to CA-only, MA-only,
HA and DCSFPSSMA by yielding an overall ODA of more
than 98% for the defect and defect free samples of different
fabric classes. Secondly, the recognition of defect area less
than 1 mm2 which has not been reported in the literature yet,
was possible using this algorithm. We propose to use this
method as a means to grade the grey fabric similar to the
standard fabric grading system.
Structuring Ideation Map using Oriented Directed Acyclic Graph with Privacy P...IDES Editor
E-Brainstorming is a computerized version of sharing
ideas and it replaces verbal communication. The productivity
of ideas generated is viewed as the dominant measure of EBrainstorming.
In Agent-based E-Brainstorming, Idea
Ontology was used to map user’s knowledge with idea names
and relationships between idea instances. In this paper
Oriented Directed Acyclic Graph (ODAG) method is used to
construct the ideation map for diverse ideas and their
relationship. Privacy Preference Ontology is integrated to
provide privacy preference for user’s data like access control,
condition, access space and restriction. Here the Idea
Knowledge Base is applied and it enfolds a collection of idea
instances of different domains to denote a client’s knowledge.
Circular Waves in Thermoelastic Plates Bordered with Viscous Liquid IDES Editor
The paper concentrates on the study of propagation of thermoelastic waves in a homogeneous, transversely isotropic, thermally conducting elastic plate bordered with layers (or half-spaces) of viscous liquid on both sides in the
context of non classical theories of thermoelasticity. Complex secular equations for symmetric and antisymmetric wave motion of the circular plate, in completely separate terms, are derived. Finally, in order to illustrate the analytical results, the numerical solution is carried out for transversely isotropic plate of cobalt material bordered with water by using the functional iteration method.
Exploring the Solution Space of Sorting by Reversals: A New ApproachIDES Editor
Analysing genome rearrangements is a problem
from the vast domain of comparative genomics and
computational biology. Several studies have shown that closely
related species have essentially the same set of genes however
their gene orders differ. The differences in the gene order are
the results of various large-scale evolutionary events of which
reversal is the most common rearrangement event. The
problem of finding the shortest sequence of reversals that can
transform one genome into another is called the sorting by
reversals problem. The length of such a sequence is the
reversal distance between the two genomes. In comparative
genomics, sorting by reversals algorithms are often used to
propose evolutionary scenarios of large-scale genomic
mutations between species. Following the first polynomial
time solution of this problem, several improvements has been
published on the subject. In 2008, Braga et al. proposed an
algorithm to perform the enumeration of traces that sort a
signed permutation by reversals. This algorithm has
exponential complexity in both time and space. To efficiently
handle the traces, Baudet and Dias proposed a depth first
approach in 2010. However, one of the limitations of the
proposed algorithm was that it cannot provide the count of
number of solutions in each trace. In this paper we are
presenting an algorithm to list the normal forms of each trace
in depth first manner and provide count of the total number of
solutions in the solution space.
Simulating Performance Impacts of Bus Priority Measures IDES Editor
Public transport has an important role to play in the
provision of reliable travel in congested conditions as it makes
excellent use of limited road space, carrying many more
passengers than a private car for a given amount of road space.
This paper involves study and analysis of various Bus Priority
Measures in terms of change in delay with respect to normal
intersection for the buses and also for whole traffic flow
(including buses and all other vehicles) with the help of results
of VISSIM simulation software for various volumes of traffic
flow. These measures can be applied to give buses priority to
make them a more attractive alternative to the private vehicles
and reducing road congestion.
Este documento describe una actividad integradora para un grupo de estudiantes. El objetivo es que los estudiantes investiguen y difundan información sobre temas como el medio ambiente, la educación o la cultura maya utilizando las redes sociales. Se divide el trabajo en tres roles: investigador documental, experimentador y experto en TIC. Cada estudiante asumirá un rol para recopilar y compartir información que pueda transformar vidas.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Comparison of Shunt Facts Devices for the Improvement of Transient Stability ...IJSRD
This paper presents, the performance of STATCOM placed at midpoint of the two machine power system and compared with the performance of SVC. The comparison of various results found for the different type of faults (single line, double line & three phase fault) occur in long transmission line, and their removal by using shunt FACTS devices is analysed. Computer simulation results under a severe disturbance condition (three phase fault) for different fault clearing times, and different line lengths are analyzed. Both controllers are implemented using MATLAB/SIMULINK. Simulation results shows that the STATCOM with conventional PI controller installed with two machine three bus systems provides better damping oscillation characteristics in rotor angle as compared to two machine power system installed with SVC. The transient stability of two machine system installed with STATCOM has been improved considerably and post settling time of the system after facing disturbance is also improved.
Comparison of Shunt Facts Devices for the Improvement of Transient Stability ...IJSRD
This paper presents, the performance of STATCOM placed at midpoint of the two machine power system and compared with the performance of SVC. The comparison of various results found for the different type of faults (single line, double line & three phase fault) occur in long transmission line, and their removal by using shunt FACTS devices is analysed. Computer simulation results under a severe disturbance condition (three phase fault) for different fault clearing times, and different line lengths are analyzed. Both controllers are implemented using MATLAB/SIMULINK. Simulation results shows that the STATCOM with conventional PI controller installed with two machine three bus systems provides better damping oscillation characteristics in rotor angle as compared to two machine power system installed with SVC. The transient stability of two machine system installed with STATCOM has been improved considerably and post settling time of the system after facing disturbance is also improved.
##CONTENT##
Introduction
Voltage control
Power system control
Control of reactive power and power factor
Interconnected control and frequency ties
Supervisory control
Line compensation
Series compensation
Series and shunt compensation schemes for ac transmission system
New Model Variable Frequency Transformer (NMVFT) – A Technology for V/f Contr...IDES Editor
Variable frequency transformer (VFT) is used as a
controllable bidirectional transmission device that can transfer
power between asynchronous networks and functionally is
similar to back-to-back HVDC. This paper describes the basic
concept of a New Model Variable Frequency Transformer
(NMVFT). NMVFT is a new technology which is used for v/f
control of induction motors. A digital simulation model of
NMVFT and its control system are developed using MATLAB.
The out power thus generated in v/f mode has been practically
verified for the speed control of a three-phase induction motor.
Thus constant speed-torque characteristics were achieved.
Location of Shunt FACTS Devices for First-Swing Stability Enhancement in Inte...Editor IJMTER
This paper deals with the location of shunt FACTS devices to improve transient stability
in a long transmission line with predefined direction of real power flow. Shunt Flexible AC
Transmission System (FACTS) devices, when placed at the mid-point of a long transmission line,
play an important role in controlling the reactive power flow to the power network and hence both
the system voltage fluctuations and transient stability. The validity of the mid-point location of shunt
FACTS devices was verified using Simulink, with different shunt FACTS devices, namely static var
compensator (SVC) and static synchronous compensator (STATCOM) in a long transmission line
using the actual line model. It has been observed that the FACTS devices, when placed slightly offcentre towards sending-end, give better performance in improving transient stability and the location
depends on the amount of local/through load. The results are experimented and simulated on
MATLAB/Simulink environment.
Transformer-Less UPFC for Wind Turbine ApplicationsIJMTST Journal
In this paper, an innovative technique with a new concept of transformer-less unified power flow controller
(UPFC) is implemented. The construction of the conventional UPFC that consists of two back-to-back inverters
which results in complexity and bulkiness which involves the transformers which are complication for
isolation & attaining high power rating with required output waveforms. To reduce a above problem to a
certain extent, a innovative transformer-less UPFC based on less complex configuration with two cascade
multilevel inverters (CMIs) has been proposed. Unified power flow controller (UPFC) has been the most
versatile Flexible AC Transmission System (FACTS) device due to its ability to control real and reactive power
80w on transmission lines while controlling the voltage of the bus to which it is connected. UPFC being a
multi-variable power system controller it is necessary to analyze its effect on power system operation. The
new UPFC offers several merits over the traditional technology, such as Transformer-less, Light weight, High
efficiency, Low cost & Fast dynamic response. This paper mainly highlights the modulation and control for
this innovative transformer-less UPFC, involving desired fundamental frequency modulation (FFM) for low
total harmonic distortion (THD), independent active and reactive power control over the transmission line,
dc-link voltage balance control, etc. The unique capabilities of the UPFC in multiple line compensation are
integrated into a generalized power flow controller that is able to maintain prescribed, and independently
controllable, real power & reactive power flow in the line. UPFC simply controls the magnitude and angular
position of the injected voltage in real time so as to maintain or vary the real and reactive power flow in the
line to satisfy load demand & system operating conditions. UPFC can control various power system
parameters, such as bus voltages and line flows. The impact of UPFC control modes and settings on the
power system reliability has not been addressed sufficiently yet. Cascade multilevel inverters has been
proposed to have an overview of producing the light weight STATCOM’s which enhances the power quality at
the output levels.When the multilevel converter is applied to STATCOM, each of the cascaded H-bridge
converters should be equipped with a galvanically isolated and floating dc capacitor without any power
source or circuit. This enables to eliminate a bulky, heavy, and costly line-frequency transformer from the
cascade STATCOM. When no UPFC is installed, interruption of either three-phase line due to a fault reduces
an active power flow to half, because the line impedance becomes double before the interruption. Installing
the UPFC makes it possible to control an amount of active power flowing through the transmission system.
Results has been shown through MATLAB Simulink
This document summarizes a study that compares the effectiveness of load tap-changing transformers (LTCT) and shunt capacitors for enhancing voltage profiles on Nigeria's 330kV, 24-bus transmission system. Load flow analysis was performed with and without each device. Results showed that with shunt capacitors, the algorithm converged in 5 iterations and total losses reduced by 4.1%, while with LTCT, convergence was in 4 iterations and losses reduced by 4.8%. Incorporating LTCT provided a better improvement to the voltage profile than shunt capacitors alone. The document provides background on voltage stability, LTCTs, shunt capacitors, the Newton-Raphson load flow technique, and how LTCT
This document defines over 80 electrical terms, including:
- A torus, which is a donut-shaped magnetic core used in electric transformers.
- Total harmonic distortion, which is an electromagnetic disturbance level expressed as a ratio calculated as a percentage of the fundamental component.
- A tower, which is a tall structure for elevating electric transmission lines, distinguished from a pole by its greater height and complexity.
- A transducer, which is a device that converts a physical quantity into an electrical signal, such as microphones, pickups, and loudspeakers.
- A transformer, which is a device with two or more coils wound on an iron core that provides an efficient means of changing voltage and
Implementation of FC-TCR for Reactive Power ControlIOSR Journals
This document discusses the implementation of a Fixed Capacitor Thyristor Controlled Reactor (FC-TCR) system for reactive power control. FC-TCR is a type of Static VAR Compensator (SVC) that can inject or absorb reactive power to control voltage. It consists of a fixed capacitor in parallel with a thyristor controlled reactor. The reactor current is controlled by varying the firing angle of thyristors, allowing both lagging and leading reactive power. MATLAB simulation results show that reactive power output from the FC-TCR increases as the reactor inductance increases while keeping the capacitor constant, demonstrating effective reactive power control.
This document discusses reactive power compensation techniques using FACTS (Flexible AC Transmission System) devices. It provides an overview of reactive power and why compensation is needed to regulate voltages and improve stability. Several FACTS devices for reactive power compensation are described, including STATCOM, SVC, TCSC, and UPFC. The document compares these devices based on their ability to control load flow, voltage, and stability. UPFC is found to be most effective for higher load flow control and voltage regulation, while STATCOM is suitable for smaller distribution systems. Reactive power compensation using FACTS devices can enhance power transfer capability and stability.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The use of distributed generation (DG) within distribution systems has increased for the last two decades due to worldwide increase in demand for electricity and governmental policy change from “conventional” energy to “green” energy. High levels of penetration of DG have many significant benefits but also come with many drawbacks such as voltage drop and power losses. This study presents the impact of DG at different locations in a distribution feeder in terms of the feeder voltage profile. A radial distribution system is simulated using PSCAD/EMTDC simulation software while changing the size and location of DG in the system. The obtained results are used for better understanding on the impact of DG on voltage profile in radial distribution feeder.
UPFC in order to Enhance the Power System ReliabilityIJMER
This document discusses unified power flow controllers (UPFCs) and their ability to enhance power system reliability. It provides an overview of FACTS devices and describes how UPFCs can control parameters like impedance, voltage, and phase angle to regulate power flow. The document summarizes the components, control modes, and benefits of UPFCs, and discusses modeling a single-phase UPFC in MATLAB/Simulink to demonstrate power flow control and voltage injection capabilities.
The document provides an overview of flexible AC transmission systems (FACTS) controllers. It discusses that FACTS controllers use power electronics to control parameters like impedance, voltage, and phase angle to enhance power flow controllability and transmission capacity. FACTS devices allow for better utilization of existing transmission systems and include series controllers that inject voltage in series with transmission lines and shunt controllers that inject current. The benefits of FACTS are more efficient power transfer, increased reliability and grid stability, and delayed investment in new transmission infrastructure.
FACTS DEVICES AND POWER SYSTEM STABILITY pptMamta Bagoria
This presentation provides an overview of Flexible AC Transmission Systems (FACTS) and power system stability. It defines FACTS as using power electronics to control power flow and enhance transmission system capacity and stability. The document outlines different types of FACTS controllers including series compensation and shunt compensation. It also classifies power system stability into rotor angle stability, voltage stability, and frequency stability and discusses factors that can lead to losses of each type of stability.
Improvise 3-Level DTC of Induction Machine using Constant Switching Frequency...IJPEDS-IAES
This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple. The major factorthat contributes to these problems the usage of hysteresis based comparators to control the output torque. The implementation of PI based constant switching method in DTC able to solve these problems while retaining the simple control structure of conventional DTC. The combination usage of 3-level CHMI in this system can further minimize the output torque ripple by providing greater number of vectors. This paper presents detail explanation and calculationof optimal PI parameter tuning strategyconsecutively to enhance the performance of 3-level DTC system. In order to validate the feasibility, the proposed method compared with convention DTC system via simulation and experiment results.
Analysis of Active Power Flow Control with Phase Shifting Transformer in AC T...ijtsrd
The document discusses active power flow control using a phase shifting transformer (PST). It explains that a PST installed in a transmission line can control active power flow by adjusting the phase angle between the line voltages. It provides equations showing that active power is proportional to the phase angle. The PST functions by injecting a controllable voltage in quadrature with the line voltage, thereby introducing a phase shift. Simulation results showed that system voltages and active power depend on the phase angle settings of the PST.
Flexible alternating current transmission systems (FACTs) technology opens up new opportunities for
controlling power flow and enhancing the usable capacity of present, as well as new and upgraded lines. These
FACTs device which enables independent control of active and reactive power besides improving reliability and
quality of the supply. This paper describes the real and reactive power flow control through a short transmission
line and then compensated short transmission line with different FACTs devices are used to selection of FACTs
devices for better reactive power compensation with change in line capacitance/shunt capacitance to observe
power flow. Computer simulation by MATLAB/SIMULINK has been used to determining better reactive power.
TCSC, STATCOM, UPFC and SSSC FACTs controller with different capacitance are tested for controlling
reactive power flow.
Similar to VFT Application for Asynchronous Power Transfer (20)
Power System State Estimation - A ReviewIDES Editor
This document provides a review of power system state estimation techniques. It discusses both static and dynamic state estimation algorithms. For static state estimation, it covers weighted least squares, decoupled, and robust estimation methods. Weighted least squares is commonly used but can have numerical instability issues. Decoupled state estimation approximates the gain matrix for faster computation. Robust estimation uses M-estimators and other techniques to handle outliers and bad data. Dynamic state estimation applies Kalman filtering, leapfrog algorithms, and other methods to continuously monitor system states over time.
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.
Design and Performance Analysis of Genetic based PID-PSS with SVC in a Multi-...IDES Editor
Damping of power system oscillations with the help
of proposed optimal Proportional Integral Derivative Power
System Stabilizer (PID-PSS) and Static Var Compensator
(SVC)-based controllers are thoroughly investigated in this
paper. This study presents robust tuning of PID-PSS and
SVC-based controllers using Genetic Algorithms (GA) in
multi machine power systems by considering detailed model
of the generators (model 1.1). The effectiveness of FACTSbased
controllers in general and SVC-based controller in
particular depends upon their proper location. Modal
controllability and observability are used to locate SVC–based
controller. The performance of the proposed controllers is
compared with conventional lead-lag power system stabilizer
(CPSS) and demonstrated on 10 machines, 39 bus New England
test system. Simulation studies show that the proposed genetic
based PID-PSS with SVC based controller provides better
performance.
Optimal Placement of DG for Loss Reduction and Voltage Sag Mitigation in Radi...IDES Editor
This paper presents the need to operate the power
system economically and with optimum levels of voltages has
further led to an increase in interest in Distributed
Generation. In order to reduce the power losses and to improve
the voltage in the distribution system, distributed generators
(DGs) are connected to load bus. To reduce the total power
losses in the system, the most important process is to identify
the proper location for fixing and sizing of DGs. It presents a
new methodology using a new population based meta heuristic
approach namely Artificial Bee Colony algorithm(ABC) for
the placement of Distributed Generators(DG) in the radial
distribution systems to reduce the real power losses and to
improve the voltage profile, voltage sag mitigation. The power
loss reduction is important factor for utility companies because
it is directly proportional to the company benefits in a
competitive electricity market, while reaching the better power
quality standards is too important as it has vital effect on
customer orientation. In this paper an ABC algorithm is
developed to gain these goals all together. In order to evaluate
sag mitigation capability of the proposed algorithm, voltage
in voltage sensitive buses is investigated. An existing 20KV
network has been chosen as test network and results are
compared with the proposed method in the radial distribution
system.
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.
Study of Structural Behaviour of Gravity Dam with Various Features of Gallery...IDES Editor
The size and shape of opening in dam causes the
stress concentration, it also causes the stress variation in the
rest of the dam cross section. The gravity method of the analysis
does not consider the size of opening and the elastic property
of dam material. Thus the objective of study is comprises of
the Finite Element Method which considers the size of
opening, elastic property of material, and stress distribution
because of geometric discontinuity in cross section of dam.
Stress concentration inside the dam increases with the opening
in dam which results in the failure of dam. Hence it is
necessary to analyses large opening inside the dam. By making
the percentage area of opening constant and varying size and
shape of opening the analysis is carried out. For this purpose
a section of Koyna Dam is considered. Dam is defined as a
plane strain element in FEM, based on geometry and loading
condition. Thus this available information specified our path
of approach to carry out 2D plane strain analysis. The results
obtained are then compared mutually to get most efficient
way of providing large opening in the gravity dam.
Assessing Uncertainty of Pushover Analysis to Geometric ModelingIDES Editor
Pushover Analysis a popular tool for seismic
performance evaluation of existing and new structures and is
nonlinear Static procedure where in monotonically increasing
loads are applied to the structure till the structure is unable
to resist the further load .During the analysis, whatever the
strength of concrete and steel is adopted for analysis of
structure may not be the same when real structure is
constructed and the pushover analysis results are very sensitive
to material model adopted, geometric model adopted, location
of plastic hinges and in general to procedure followed by the
analyzer. In this paper attempt has been made to assess
uncertainty in pushover analysis results by considering user
defined hinges and frame modeled as bare frame and frame
with slab modeled as rigid diaphragm and results compared
with experimental observations. Uncertain parameters
considered includes the strength of concrete, strength of steel
and cover to the reinforcement which are randomly generated
and incorporated into the analysis. The results are then
compared with experimental observations.
Secure Multi-Party Negotiation: An Analysis for Electronic Payments in Mobile...IDES Editor
This document summarizes and analyzes secure multi-party negotiation protocols for electronic payments in mobile computing. It presents a framework for secure multi-party decision protocols using lightweight implementations. The main focus is on synchronizing security features to avoid agreement manipulation and reduce user traffic. The paper describes negotiation between an auctioneer and bidders, showing multiparty security is better than existing systems. It analyzes the performance of encryption algorithms like ECC, XTR, and RSA for use in the multiparty negotiation protocols.
Selfish Node Isolation & Incentivation using Progressive ThresholdsIDES Editor
The problems associated with selfish nodes in
MANET are addressed by a collaborative watchdog approach
which reduces the detection time for selfish nodes thereby
improves the performance and accuracy of watchdogs[1]. In
the related works they make use of credit based systems, reputation
based mechanisms, pathrater and watchdog mechanism
to detect such selfish nodes. In this paper we follow an approach
of collaborative watchdog which reduces the detection
time for selfish nodes and also involves the removal of such
selfish nodes based on some progressively assessed thresholds.
The threshold gives the nodes a chance to stop misbehaving
before it is permanently deleted from the network.
The node passes through several isolation processes before it
is permanently removed. Another version of AODV protocol
is used here which allows the simulation of selfish nodes in
NS2 by adding or modifying log files in the protocol.
Various OSI Layer Attacks and Countermeasure to Enhance the Performance of WS...IDES Editor
Wireless sensor networks are networks having non
wired infrastructure and dynamic topology. In OSI model each
layer is prone to various attacks, which halts the performance
of a network .In this paper several attacks on four layers of
OSI model are discussed and security mechanism is described
to prevent attack in network layer i.e wormhole attack. In
Wormhole attack two or more malicious nodes makes a covert
channel which attracts the traffic towards itself by depicting a
low latency link and then start dropping and replaying packets
in the multi-path route. This paper proposes promiscuous mode
method to detect and isolate the malicious node during
wormhole attack by using Ad-hoc on demand distance vector
routing protocol (AODV) with omnidirectional antenna. The
methodology implemented notifies that the nodes which are
not participating in multi-path routing generates an alarm
message during delay and then detects and isolate the
malicious node from network. We also notice that not only
the same kind of attacks but also the same kind of
countermeasures can appear in multiple layer. For example,
misbehavior detection techniques can be applied to almost all
the layers we discussed.
Responsive Parameter based an AntiWorm Approach to Prevent Wormhole Attack in...IDES Editor
The recent advancements in the wireless technology
and their wide-spread deployment have made remarkable
enhancements in efficiency in the corporate and industrial
and Military sectors The increasing popularity and usage of
wireless technology is creating a need for more secure wireless
Ad hoc networks. This paper aims researched and developed
a new protocol that prevents wormhole attacks on a ad hoc
network. A few existing protocols detect wormhole attacks but
they require highly specialized equipment not found on most
wireless devices. This paper aims to develop a defense against
wormhole attacks as an Anti-worm protocol which is based on
responsive parameters, that does not require as a significant
amount of specialized equipment, trick clock synchronization,
no GPS dependencies.
Cloud Security and Data Integrity with Client Accountability FrameworkIDES Editor
This document summarizes a proposed cloud security and data integrity framework that provides client accountability. The framework aims to address issues like lack of user control over cloud data, need for data transparency and tracking, and ensuring data integrity. It proposes using JAR (Java Archive) files for data sharing due to benefits like portability. The framework incorporates client-side verification using MD5 hashing, digital signature-based authentication of JAR files, and use of HMAC to ensure data integrity. It also uses password-based encryption of log files to keep them tamper-proof. The framework is intended to provide both accountability and security for data sharing in cloud environments.
Genetic Algorithm based Layered Detection and Defense of HTTP BotnetIDES Editor
A System state in HTTP botnet uses HTTP protocol
for the creation of chain of Botnets thereby compromising
other systems. By using HTTP protocol and port number 80,
attacks can not only be hidden but also pass through the
firewall without being detected. The DPR based detection
leads to better analysis of botnet attacks [3]. However, it
provides only probabilistic detection of the attacker and also
time consuming and error prone. This paper proposes a Genetic
algorithm based layered approach for detecting as well as
preventing botnet attacks. The paper reviews p2p firewall
implementation which forms the basis of filtering.
Performance evaluation is done based on precision, F-value
and probability. Layered approach reduces the computation
and overall time requirement [7]. Genetic algorithm promises
a low false positive rate.
Enhancing Data Storage Security in Cloud Computing Through SteganographyIDES Editor
This document summarizes a research paper that proposes a method for enhancing data security in cloud computing through steganography. The method hides user data in digital images stored on cloud servers. When data needs to be accessed, it is extracted from the images. The document outlines the cloud architecture and security issues addressed. It then describes the proposed system architecture, security model, and data storage and retrieval process. Data is partitioned and hidden in multiple images to improve security. The goal is to prevent unauthorized access to user data stored on cloud servers.
The main tasks of a Wireless Sensor Network
(WSN) are data collection from its nodes and communication
of this data to the base station (BS). The protocols used for
communication among the WSN nodes and between the WSN
and the BS, must consider the resource constraints of nodes,
battery energy, computational capabilities and memory. The
WSN applications involve unattended operation of the network
over an extended period of time. In order to extend the lifetime
of a WSN, efficient routing protocols need to be adopted. The
proposed low power routing protocol based on tree-based
network structure reliably forwards the measured data towards
the BS using TDMA. An energy consumption analysis of the
WSN making use of this protocol is also carried out. It is
found that the network is energy efficient with an average
duty cycle of 0:7% for the WSN nodes. The OmNET++
simulation platform along with MiXiM framework is made
use of.
Permutation of Pixels within the Shares of Visual Cryptography using KBRP for...IDES Editor
The security of authentication of internet based
co-banking services should not be susceptible to high risks.
The passwords are highly vulnerable to virus attacks due to
the lack of high end embedding of security methods. In order
for the passwords to be more secure, people are generally
compelled to select jumbled up character based passwords
which are not only less memorable but are also equally prone
to insecurity. Multiple use of distributed shares has been
studied to solve the problem of authentication by algorithms
based on thresholding of pixels in image processing and visual
cryptography concepts where the subset of shares is considered
for the recovery of the original image for authentication using
correlation function[1][2].The main disadvantage in the above
study is the plain storage of shares and also one of the shares
is being supplied to the customer, which will lead to the
possibility of misuse by a third party. This paper proposes a
technique for scrambling of pixels by key based random
permutation (KBRP) within the shares before the
authentication has been attempted. Total number of shares to
be created is dependent on the multiplicity of ownership of
the account. By this method the problem of uncertainty among
the customers with regard to security, storage, retrieval of
holding of half of the shares is minimized.
This paper presents a trifocal Rotman Lens Design
approach. The effects of focal ratio and element spacing on
the performance of Rotman Lens are described. A three beam
prototype feeding 4 element antenna array working in L-band
has been simulated using RLD v1.7 software. Simulated
results show that the simulated lens has a return loss of –
12.4dB at 1.8GHz. Beam to array port phase error variation
with change in the focal ratio and element spacing has also
been investigated.
Band Clustering for the Lossless Compression of AVIRIS Hyperspectral ImagesIDES Editor
Hyperspectral images can be efficiently compressed
through a linear predictive model, as for example the one
used in the SLSQ algorithm. In this paper we exploit this
predictive model on the AVIRIS images by individuating,
through an off-line approach, a common subset of bands, which
are not spectrally related with any other bands. These bands
are not useful as prediction reference for the SLSQ 3-D
predictive model and we need to encode them via other
prediction strategies which consider only spatial correlation.
We have obtained this subset by clustering the AVIRIS bands
via the clustering by compression approach. The main result
of this paper is the list of the bands, not related with the
others, for AVIRIS images. The clustering trees obtained for
AVIRIS and the relationship among bands they depict is also
an interesting starting point for future research.
Microelectronic Circuit Analogous to Hydrogen Bonding Network in Active Site ...IDES Editor
A microelectronic circuit of block-elements
functionally analogous to two hydrogen bonding networks is
investigated. The hydrogen bonding networks are extracted
from â-lactamase protein and are formed in its active site.
Each hydrogen bond of the network is described in equivalent
electrical circuit by three or four-terminal block-element.
Each block-element is coded in Matlab. Static and dynamic
analyses are performed. The resultant microelectronic circuit
analogous to the hydrogen bonding network operates as
current mirror, sine pulse source, triangular pulse source as
well as signal modulator.
Texture Unit based Monocular Real-world Scene Classification using SOM and KN...IDES Editor
In this paper a method is proposed to discriminate
real world scenes in to natural and manmade scenes of similar
depth. Global-roughness of a scene image varies as a function
of image-depth. Increase in image depth leads to increase in
roughness in manmade scenes; on the contrary natural scenes
exhibit smooth behavior at higher image depth. This particular
arrangement of pixels in scene structure can be well explained
by local texture information in a pixel and its neighborhood.
Our proposed method analyses local texture information of a
scene image using texture unit matrix. For final classification
we have used both supervised and unsupervised learning using
K-Nearest Neighbor classifier (KNN) and Self Organizing
Map (SOM) respectively. This technique is useful for online
classification due to very less computational complexity.
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
GraphRAG for life science domain, where you retriever information from biomedical knowledge graphs using LLMs to increase the accuracy and performance of generated answers
Best 20 SEO Techniques To Improve Website Visibility In SERPPixlogix Infotech
Boost your website's visibility with proven SEO techniques! Our latest blog dives into essential strategies to enhance your online presence, increase traffic, and rank higher on search engines. From keyword optimization to quality content creation, learn how to make your site stand out in the crowded digital landscape. Discover actionable tips and expert insights to elevate your SEO game.
leewayhertz.com-AI in predictive maintenance Use cases technologies benefits ...alexjohnson7307
Predictive maintenance is a proactive approach that anticipates equipment failures before they happen. At the forefront of this innovative strategy is Artificial Intelligence (AI), which brings unprecedented precision and efficiency. AI in predictive maintenance is transforming industries by reducing downtime, minimizing costs, and enhancing productivity.
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Digital Marketing Trends in 2024 | Guide for Staying AheadWask
https://www.wask.co/ebooks/digital-marketing-trends-in-2024
Feeling lost in the digital marketing whirlwind of 2024? Technology is changing, consumer habits are evolving, and staying ahead of the curve feels like a never-ending pursuit. This e-book is your compass. Dive into actionable insights to handle the complexities of modern marketing. From hyper-personalization to the power of user-generated content, learn how to build long-term relationships with your audience and unlock the secrets to success in the ever-shifting digital landscape.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Driving Business Innovation: Latest Generative AI Advancements & Success StorySafe Software
Are you ready to revolutionize how you handle data? Join us for a webinar where we’ll bring you up to speed with the latest advancements in Generative AI technology and discover how leveraging FME with tools from giants like Google Gemini, Amazon, and Microsoft OpenAI can supercharge your workflow efficiency.
During the hour, we’ll take you through:
Guest Speaker Segment with Hannah Barrington: Dive into the world of dynamic real estate marketing with Hannah, the Marketing Manager at Workspace Group. Hear firsthand how their team generates engaging descriptions for thousands of office units by integrating diverse data sources—from PDF floorplans to web pages—using FME transformers, like OpenAIVisionConnector and AnthropicVisionConnector. This use case will show you how GenAI can streamline content creation for marketing across the board.
Ollama Use Case: Learn how Scenario Specialist Dmitri Bagh has utilized Ollama within FME to input data, create custom models, and enhance security protocols. This segment will include demos to illustrate the full capabilities of FME in AI-driven processes.
Custom AI Models: Discover how to leverage FME to build personalized AI models using your data. Whether it’s populating a model with local data for added security or integrating public AI tools, find out how FME facilitates a versatile and secure approach to AI.
We’ll wrap up with a live Q&A session where you can engage with our experts on your specific use cases, and learn more about optimizing your data workflows with AI.
This webinar is ideal for professionals seeking to harness the power of AI within their data management systems while ensuring high levels of customization and security. Whether you're a novice or an expert, gain actionable insights and strategies to elevate your data processes. Join us to see how FME and AI can revolutionize how you work with data!
Nunit vs XUnit vs MSTest Differences Between These Unit Testing Frameworks.pdfflufftailshop
When it comes to unit testing in the .NET ecosystem, developers have a wide range of options available. Among the most popular choices are NUnit, XUnit, and MSTest. These unit testing frameworks provide essential tools and features to help ensure the quality and reliability of code. However, understanding the differences between these frameworks is crucial for selecting the most suitable one for your projects.
Trusted Execution Environment for Decentralized Process MiningLucaBarbaro3
Presentation of the paper "Trusted Execution Environment for Decentralized Process Mining" given during the CAiSE 2024 Conference in Cyprus on June 7, 2024.
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
8. Monitoring Application Metrics with Prometheus
- Detailed instructions on setting up Prometheus to monitor the performance and health of your anomaly detection system.
9. What is Camel K?
- Introduction to Camel K, a lightweight integration framework built on Apache Camel, designed for Kubernetes.
10. Configuring Camel K Integrations for Data Pipelines
- Learn how to configure Camel K for seamless data pipeline integrations in your anomaly detection workflow.
11. What is a Jupyter Notebook?
- Overview of Jupyter Notebooks, an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
12. Jupyter Notebooks with Code Examples
- Hands-on examples and code snippets in Jupyter Notebooks to help you implement and test anomaly detection models.
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Main news related to the CCS TSI 2023 (2023/1695)Jakub Marek
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
Introduction of Cybersecurity with OSS at Code Europe 2024Hiroshi SHIBATA
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.