This paper addresses the issue of the modeling
and analysis of STATCOM controller. The transient
analysis and modeling is performed with the state-of-theart
digital simulator PSCAD 4.2.1. Simulation were
carried out for both cases where, STATCOM was
connected into the system and not, with simulation
interval 3-5 sec. The aim of the STATCOM is to provide
good power quality at the point of common coupling
(PCC). Some simulation results are presented, which
shows the compensation effectiveness of the STATCOM
controller at the connected bus.
Facts controllers for power flow control a brief reviewDHEERAJ DHAKAR
This paper provides a review of FACTS devices. The value of these FACTS is the improvement of security and efficiency of power transmission networks. Fast controllability in emergency situation provides increased flexibility and therefore stability and security advantages. The flexibility in control allows operating closer to stability limits and improve the efficiency of existing networks
1. Shunt compensation involves connecting FACTS devices in parallel with transmission lines to act as controllable current sources.
2. There are two types of shunt compensation: shunt capacitive compensation improves power factor by injecting a leading current, while shunt inductive compensation increases power transfer capability by reducing voltage amplification.
3. Examples of FACTS devices for shunt compensation include STATCOM, SVC using TCR, TSC and TSR to continuously or stepwise vary the equivalent reactance.
60232804 ppt-compensation-techniques-in-ac-transmission-system-using-cABHISHEK RAI
This document discusses series compensation of transmission lines and a new fault location algorithm for series compensated lines under power oscillation conditions. The key points are:
1. Series compensation is used to increase power transfer capability and improve stability by reducing transmission line reactance. It allows increased power transfer but introduces problems like sub-synchronous resonance.
2. The new fault location algorithm accounts for the influence of series capacitors on fault voltages and currents during power oscillations. It calculates corrected voltage drops across series capacitors to improve fault location accuracy under dynamic conditions.
3. The algorithm identifies whether faults occur on the left or right side of series capacitors using a criterion based on voltage and current measurements. An iterative process is
Series & shunt compensation and FACTs Deviceskhemraj298
Series compensation is used to improve the performance of extra high voltage transmission lines by connecting capacitors in series with the line. It allows for increased transmission capacity and improved system stability by reducing the phase angle between sending and receiving end voltages for the same power transfer. Shunt compensation controls the receiving end voltage by connecting shunt capacitors or reactors to meet reactive power demand and prevent voltage drops or rises. Flexible AC transmission systems use high-speed thyristors to switch transmission line components like capacitors and reactors to control parameters like voltages and reactances to optimize power transfer.
The document discusses various objectives and applications of static shunt compensation on transmission lines. Shunt compensation can increase steady-state transmittable power, control voltage profiles, minimize line overvoltage under light loads using shunt reactors, and maintain voltage levels under heavy loads using shunt capacitors. Midpoint shunt compensation significantly increases transmitted power and is best located at the midpoint where voltage sag is maximum. End of line shunt compensation effectively increases voltage stability limits and regulates terminal voltages to prevent voltage instability. Shunt compensation can also improve transient stability and damp power oscillations on transmission lines.
The document discusses implementing FACTS controllers on a 370km transmission line model to improve performance. It describes FACTS, different types of FACTS controllers including thyristor controlled series compensation (TCSC) and shunt compensation. Simulation results show that with FACTS compensation, the line can transfer more active power with better voltage regulation and power factor compared to the uncompensated line. FACTS increases the line's power transfer capability.
The document discusses Thyristor Controlled Series Compensation (TCSC), a FACTS device that uses thyristors to control the capacitive reactance of transmission lines. TCSC can enhance power flow, limit fault current, improve stability and transients. It introduces benefits like mitigating subsynchronous resonance risks, damping power oscillations, and improving post-contingency stability. TCSC operates in modes like blocking, bypass, capacitive boost and inductive boost to accurately regulate power flow and damp oscillations while increasing transmission capacity and stability.
The document discusses the Static Synchronous Series Compensator (SSSC), a FACTS device that employs a voltage source converter connected in series to a transmission line through a transformer. The SSSC operates like a controllable series capacitor and inductor. It has three main components: a voltage source converter, transformer, and energy source. The SSSC can provide either capacitive or inductive compensation by controlling the phase of its injected voltage relative to the line current. It regulates power flow in the transmission line by effectively varying the total line reactance. The SSSC offers advantages like improving system performance, reactive power support without an external source, and control of electric power flow in transmission lines.
Facts controllers for power flow control a brief reviewDHEERAJ DHAKAR
This paper provides a review of FACTS devices. The value of these FACTS is the improvement of security and efficiency of power transmission networks. Fast controllability in emergency situation provides increased flexibility and therefore stability and security advantages. The flexibility in control allows operating closer to stability limits and improve the efficiency of existing networks
1. Shunt compensation involves connecting FACTS devices in parallel with transmission lines to act as controllable current sources.
2. There are two types of shunt compensation: shunt capacitive compensation improves power factor by injecting a leading current, while shunt inductive compensation increases power transfer capability by reducing voltage amplification.
3. Examples of FACTS devices for shunt compensation include STATCOM, SVC using TCR, TSC and TSR to continuously or stepwise vary the equivalent reactance.
60232804 ppt-compensation-techniques-in-ac-transmission-system-using-cABHISHEK RAI
This document discusses series compensation of transmission lines and a new fault location algorithm for series compensated lines under power oscillation conditions. The key points are:
1. Series compensation is used to increase power transfer capability and improve stability by reducing transmission line reactance. It allows increased power transfer but introduces problems like sub-synchronous resonance.
2. The new fault location algorithm accounts for the influence of series capacitors on fault voltages and currents during power oscillations. It calculates corrected voltage drops across series capacitors to improve fault location accuracy under dynamic conditions.
3. The algorithm identifies whether faults occur on the left or right side of series capacitors using a criterion based on voltage and current measurements. An iterative process is
Series & shunt compensation and FACTs Deviceskhemraj298
Series compensation is used to improve the performance of extra high voltage transmission lines by connecting capacitors in series with the line. It allows for increased transmission capacity and improved system stability by reducing the phase angle between sending and receiving end voltages for the same power transfer. Shunt compensation controls the receiving end voltage by connecting shunt capacitors or reactors to meet reactive power demand and prevent voltage drops or rises. Flexible AC transmission systems use high-speed thyristors to switch transmission line components like capacitors and reactors to control parameters like voltages and reactances to optimize power transfer.
The document discusses various objectives and applications of static shunt compensation on transmission lines. Shunt compensation can increase steady-state transmittable power, control voltage profiles, minimize line overvoltage under light loads using shunt reactors, and maintain voltage levels under heavy loads using shunt capacitors. Midpoint shunt compensation significantly increases transmitted power and is best located at the midpoint where voltage sag is maximum. End of line shunt compensation effectively increases voltage stability limits and regulates terminal voltages to prevent voltage instability. Shunt compensation can also improve transient stability and damp power oscillations on transmission lines.
The document discusses implementing FACTS controllers on a 370km transmission line model to improve performance. It describes FACTS, different types of FACTS controllers including thyristor controlled series compensation (TCSC) and shunt compensation. Simulation results show that with FACTS compensation, the line can transfer more active power with better voltage regulation and power factor compared to the uncompensated line. FACTS increases the line's power transfer capability.
The document discusses Thyristor Controlled Series Compensation (TCSC), a FACTS device that uses thyristors to control the capacitive reactance of transmission lines. TCSC can enhance power flow, limit fault current, improve stability and transients. It introduces benefits like mitigating subsynchronous resonance risks, damping power oscillations, and improving post-contingency stability. TCSC operates in modes like blocking, bypass, capacitive boost and inductive boost to accurately regulate power flow and damp oscillations while increasing transmission capacity and stability.
The document discusses the Static Synchronous Series Compensator (SSSC), a FACTS device that employs a voltage source converter connected in series to a transmission line through a transformer. The SSSC operates like a controllable series capacitor and inductor. It has three main components: a voltage source converter, transformer, and energy source. The SSSC can provide either capacitive or inductive compensation by controlling the phase of its injected voltage relative to the line current. It regulates power flow in the transmission line by effectively varying the total line reactance. The SSSC offers advantages like improving system performance, reactive power support without an external source, and control of electric power flow in transmission lines.
Flexible AC Transmission System (FACTS) controllers use power electronics to control parameters of AC transmission systems. This improves power transfer capability. The document discusses several types of FACTS controllers:
- Series controllers inject voltage in series with transmission lines. Examples are STATCOM, SSSC, TCSC.
- Shunt controllers inject current and supply/absorb reactive power. Examples are SVC, STATCOM.
- Combined series-shunt controllers like UPFC control both series line parameters and shunt reactive power.
The TCSC provides continuously variable series compensation of transmission lines. It consists of a thyristor-controlled reactor connected in parallel with a fixed capacitor. This allows tuning of the overall
This document provides an overview of the thyristor controlled series capacitor (TCSC). It begins with the basic TCSC scheme and equations showing how the variable inductive reactance XL can change the capacitive reactance XC. It then discusses the impedance characteristics of the TCSC and how the capacitor voltage is reversed by the thyristor controlled reactor (TCR). Next, it examines the TCSC operating in the capacitive and inductive regions and how it can provide phase advance or retard. The document also covers the attainable voltage-current characteristics and harmonic voltage generation in the TCSC. It describes the functional internal control schemes and concludes with notes on design considerations.
This document discusses various types of FACTS (Flexible AC Transmission System) devices used to control power flow in transmission lines. It describes shunt FACTS devices like static VAR compensators (SVC) and static synchronous compensators (STATCOM) which can generate or absorb reactive power. It also discusses series FACTS devices like thyristor-controlled series capacitors (TCSC) and static synchronous series compensators (SSSC) which can control active power flow by varying the line impedance. TCSC is highlighted as being more economical than other series FACTS technologies and can provide benefits like damping power oscillations, improving stability and controlling power flow.
1. The document discusses a static synchronous series compensator (SSSC), a type of flexible AC transmission system (FACTS) device that controls electric power flow by injecting a controlled voltage in series with a transmission line.
2. The SSSC can provide either capacitive or inductive compensation, depending on whether the injected voltage lags or leads the line current.
3. Digital simulations show that the SSSC can increase or decrease the dynamic power flow in the transmission line depending on the mode of compensation.
In the modern power system the reactive power compensation is one of the main issues, the transmission of active power requires a difference in angular phase between voltages at the sending and receiving points (which is feasible within wide limits), whereas the transmission of reactive power requires a difference in magnitude of these same voltages (which is feasible only within very narrow limits). The reactive power is consumed not only by most of the network elements, but also by most of the consumer loads, so it must be supplied somewhere. If we can't transmit it very easily, then it ought to be generated where it is needed." (Reference Edited by T. J. E. Miller, Forward Page ix).Thus we need to work on the efficient methods by which VAR compensation can be applied easily and we can optimize the modern power system. VAR control technique can provides appropriate placement of compensation devices by which a desirable voltage profile can be achieved and at the same time minimizing the power losses in the system. This report discusses the transmission line requirements for reactive power compensation. In this report thyristor switched capacitor is explained which is a static VAR compensator used for reactive power management in electrical systems.
Seminar Topic For Electrical and Electronics Engineering (EEE)
This document provides information about EHV AC and DC transmission, specifically components of EHV DC systems and converter circuits. It discusses:
1) The main components of EHV DC systems include converter transformers, thyristor valves, bus bars, and series reactors. Converters use thyristor valves connected in a three-phase full-wave bridge circuit to convert AC to DC and vice versa.
2) Converters require reactive power, which is supplied by AC filters, shunt capacitors or synchronous condensers. Operation of converters generates harmonic voltages and currents that can cause equipment heating, interference, and other issues if not mitigated.
3) Harmonics are mitigated using AC and DC
This document is a final year project presentation on Static VAR Compensator (SVC). It discusses Flexible AC Transmission Systems (FACTS) which use power electronics to control power flow and increase transmission capacity. SVCs in particular provide fast reactive power support to control voltage and improve stability. Different types of SVC are described including series and shunt compensators using thyristor controlled capacitors and reactors. Mechanically Switched Capacitors are also discussed as a type of shunt compensator. The project layout and applications of SVC systems for transmission systems are outlined.
Gcsc gto thyristor controlled series capacitorLEOPAUL23
The document discusses the GTO Thyristor Controlled Series Capacitor (GCSC), which consists of a fixed capacitor in parallel with an anti-parallel GTO pair. The GCSC can continuously vary the voltage across the capacitor between zero and its maximum value by controlling the turn-off delay angle of the thyristor valve. It works by closing and opening the thyristor valve in synchronism with the supply frequency. The GCSC can operate in either voltage compensating mode, to maintain a rated compensating voltage over a range of line currents, or in reactance compensating mode, to maintain a maximum rated compensating reactance at any line current.
1. The document discusses control strategies for EHV AC and DC transmission systems, including desired features of HVDC system control, control characteristics of constant current and constant extinction angle, and parallel operation of AC and DC systems.
2. Control of HVDC systems is achieved through control of current or voltage to maintain a constant voltage in the DC link. Common control modes include constant current control at the rectifier and constant extinction angle control at the inverter.
3. Parallel operation of AC and DC systems can present problems but also advantages; control coordination is needed between the two different transmission types.
High Voltage Direct Current Transmission Systems 2Mark MaterialsSanthosh Kumar
The document provides information about HVDC transmission, including:
1. It lists two merits of AC transmission (power can be generated at high voltages, maintenance of AC substations is easy and cheaper) and two merits of DC transmission (it requires only two conductors, there is no skin effect).
2. It discusses types of DC link including monopolar, bipolar, and homopolar links.
3. It lists types of power devices used for HVDC transmission including thyristor, IGBT, GTO, LTT, and MCT.
4. It provides advantages and disadvantages of HVDC transmission such as full control over power, reduced transmission lines, and inability to change voltage
voltage stability by compensating reactive powerDurgarao Gundu
This document summarizes a student project report on stabilizing voltage by compensating reactive power. The objectives of the project are to explain how to improve voltage stability by installing sources of reactive power at distribution system buses. Reactive power compensation devices like shunt capacitors, SVCs, and TCRs can directly deliver reactive power to buses to maintain constant voltage despite varying load. The report will simulate and analyze the effects of these devices on voltage stabilization.
The document discusses various methods for controlling voltage in power systems. It describes how voltage control is achieved through tap changing transformers, which can control voltage within a range of +15% to -15%. Both off-load and on-load tap changing are discussed. Shunt reactors and capacitors are used to control voltage by compensating for line inductance and capacitance. Series capacitors are used on long EHV lines to reduce line inductive reactance and increase power transfer capability, but not for direct voltage regulation.
This document provides information about high voltage direct current (HVDC) transmission. It begins with an introduction comparing AC and DC transmission, noting advantages of DC such as fewer conductors required and lack of effects from inductance and capacitance. It then describes types of HVDC links including monopolar, bipolar, and homopolar. Details are given about HVDC converter stations including converter units, valves, transformers, filters, reactive power sources, and smoothing reactors. Multi-terminal HVDC systems and their advantages are outlined. Principles of DC link control through constant current or voltage are summarized.
Reactive power compensation manages reactive power to improve AC power system performance related to load and voltage support. Reactive power compensation devices reduce reactive power flow in grids, lowering energy losses and improving operating conditions. Static VAR compensators (SVCs) are commonly used for reactive power compensation using thyristor-controlled reactors and capacitors to generate or absorb reactive power and regulate voltage. SVCs improve power transmission capability, transient stability, and load power factors to reduce losses and increase system capacity.
Simplified analysis of graetz circuit copy - copyVert Wheeler
The document summarizes the analysis of a Graetz circuit, which is used in HVDC transmission, under two scenarios: without overlap and with overlap between thyristor valves. In the without overlap scenario, the analysis assumes valves switch on and off instantaneously with no two valves on at once. This allows simplifying the circuit to determine voltage and current waveforms. When overlap is considered and two valves can be on simultaneously, the analysis is more complex with different operation modes identified depending on the overlap angle. Key aspects of voltage, current, power factor and harmonics are derived.
This document discusses power semiconducting switches, specifically thyristors. It defines thyristors and lists some common types, including SCRs, GTOs, triacs, and LASCRs. It then focuses on SCRs, describing their structure, characteristics like triggering methods, and important applications. Protection of thyristors is also covered, such as protecting against high di/dt, dv/dt, overvoltage, overcurrent, and noise. Common uses of thyristors include electric vehicle control, switching, HVDC transmission, and industrial applications.
This document provides an overview of EHV AC and DC transmission. It discusses:
1) The construction of EHV AC and DC transmission links, including the components of AC systems and the types of DC links.
2) The limitations and advantages of AC and DC transmission. AC faces challenges with reactive power and stability over long distances, while DC has benefits of lower losses and greater power control.
3) The principal applications of AC and DC transmission, with DC preferred for long distance, asynchronous connections, and submarine cables due to its advantages over AC in these scenarios.
POWER QUALITY IMPROVEMENT BY SSSC AND STATCOM USING PI CONTROLLERJournal For Research
This document summarizes research on using SSSC (Static Synchronous Series Compensator) and STATCOM (Static Synchronous Compensator) to improve power quality and voltage stability in a two machine, four bus power system model. It describes the basic operational principles of SSSC and STATCOM, which are FACTS devices that can be connected in series and parallel, respectively, with transmission lines. The document presents simulation results showing that connecting an SSSC to Bus 2 and a STATCOM to Bus 2 both increase the voltage levels and regulate active and reactive power flows at the different buses, demonstrating the effectiveness of these devices for maintaining voltage stability.
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.
Enhancement of power quality in distribution system using d statcomvasaharish
1) The document discusses a project to enhance power quality in a distribution system using a D-STATCOM. It describes common power quality problems like voltage sags, harmonic distortion, and low power factor.
2) It provides details on the components and operation of a D-STATCOM, which contains a voltage source converter, controller, energy storage circuit, and LCL passive filter.
3) The methodology section describes simulating different fault scenarios in a test system both with and without a D-STATCOM and with or without the LCL filter. The results demonstrate that a D-STATCOM can mitigate voltage sags and an LCL filter reduces harmonic distortion.
This document provides an overview of reactive power compensation. It defines reactive power compensation as any device connected in series or parallel with a load to supply the reactive power demanded. There are two main types of compensation: shunt compensation using parallel capacitors to improve power factor and boost voltage, and series compensation using series capacitors to boost receiving end voltage and transmission capacity. Fixed compensation uses breaker controlled capacitors for constant loads, while dynamic compensation uses thyristor controlled capacitors for fluctuating loads. Benefits include better efficiency, improved voltage, reduced losses and higher load capability. Capacitors are used as they generate reactive power to supply loads.
Flexible AC Transmission System (FACTS) controllers use power electronics to control parameters of AC transmission systems. This improves power transfer capability. The document discusses several types of FACTS controllers:
- Series controllers inject voltage in series with transmission lines. Examples are STATCOM, SSSC, TCSC.
- Shunt controllers inject current and supply/absorb reactive power. Examples are SVC, STATCOM.
- Combined series-shunt controllers like UPFC control both series line parameters and shunt reactive power.
The TCSC provides continuously variable series compensation of transmission lines. It consists of a thyristor-controlled reactor connected in parallel with a fixed capacitor. This allows tuning of the overall
This document provides an overview of the thyristor controlled series capacitor (TCSC). It begins with the basic TCSC scheme and equations showing how the variable inductive reactance XL can change the capacitive reactance XC. It then discusses the impedance characteristics of the TCSC and how the capacitor voltage is reversed by the thyristor controlled reactor (TCR). Next, it examines the TCSC operating in the capacitive and inductive regions and how it can provide phase advance or retard. The document also covers the attainable voltage-current characteristics and harmonic voltage generation in the TCSC. It describes the functional internal control schemes and concludes with notes on design considerations.
This document discusses various types of FACTS (Flexible AC Transmission System) devices used to control power flow in transmission lines. It describes shunt FACTS devices like static VAR compensators (SVC) and static synchronous compensators (STATCOM) which can generate or absorb reactive power. It also discusses series FACTS devices like thyristor-controlled series capacitors (TCSC) and static synchronous series compensators (SSSC) which can control active power flow by varying the line impedance. TCSC is highlighted as being more economical than other series FACTS technologies and can provide benefits like damping power oscillations, improving stability and controlling power flow.
1. The document discusses a static synchronous series compensator (SSSC), a type of flexible AC transmission system (FACTS) device that controls electric power flow by injecting a controlled voltage in series with a transmission line.
2. The SSSC can provide either capacitive or inductive compensation, depending on whether the injected voltage lags or leads the line current.
3. Digital simulations show that the SSSC can increase or decrease the dynamic power flow in the transmission line depending on the mode of compensation.
In the modern power system the reactive power compensation is one of the main issues, the transmission of active power requires a difference in angular phase between voltages at the sending and receiving points (which is feasible within wide limits), whereas the transmission of reactive power requires a difference in magnitude of these same voltages (which is feasible only within very narrow limits). The reactive power is consumed not only by most of the network elements, but also by most of the consumer loads, so it must be supplied somewhere. If we can't transmit it very easily, then it ought to be generated where it is needed." (Reference Edited by T. J. E. Miller, Forward Page ix).Thus we need to work on the efficient methods by which VAR compensation can be applied easily and we can optimize the modern power system. VAR control technique can provides appropriate placement of compensation devices by which a desirable voltage profile can be achieved and at the same time minimizing the power losses in the system. This report discusses the transmission line requirements for reactive power compensation. In this report thyristor switched capacitor is explained which is a static VAR compensator used for reactive power management in electrical systems.
Seminar Topic For Electrical and Electronics Engineering (EEE)
This document provides information about EHV AC and DC transmission, specifically components of EHV DC systems and converter circuits. It discusses:
1) The main components of EHV DC systems include converter transformers, thyristor valves, bus bars, and series reactors. Converters use thyristor valves connected in a three-phase full-wave bridge circuit to convert AC to DC and vice versa.
2) Converters require reactive power, which is supplied by AC filters, shunt capacitors or synchronous condensers. Operation of converters generates harmonic voltages and currents that can cause equipment heating, interference, and other issues if not mitigated.
3) Harmonics are mitigated using AC and DC
This document is a final year project presentation on Static VAR Compensator (SVC). It discusses Flexible AC Transmission Systems (FACTS) which use power electronics to control power flow and increase transmission capacity. SVCs in particular provide fast reactive power support to control voltage and improve stability. Different types of SVC are described including series and shunt compensators using thyristor controlled capacitors and reactors. Mechanically Switched Capacitors are also discussed as a type of shunt compensator. The project layout and applications of SVC systems for transmission systems are outlined.
Gcsc gto thyristor controlled series capacitorLEOPAUL23
The document discusses the GTO Thyristor Controlled Series Capacitor (GCSC), which consists of a fixed capacitor in parallel with an anti-parallel GTO pair. The GCSC can continuously vary the voltage across the capacitor between zero and its maximum value by controlling the turn-off delay angle of the thyristor valve. It works by closing and opening the thyristor valve in synchronism with the supply frequency. The GCSC can operate in either voltage compensating mode, to maintain a rated compensating voltage over a range of line currents, or in reactance compensating mode, to maintain a maximum rated compensating reactance at any line current.
1. The document discusses control strategies for EHV AC and DC transmission systems, including desired features of HVDC system control, control characteristics of constant current and constant extinction angle, and parallel operation of AC and DC systems.
2. Control of HVDC systems is achieved through control of current or voltage to maintain a constant voltage in the DC link. Common control modes include constant current control at the rectifier and constant extinction angle control at the inverter.
3. Parallel operation of AC and DC systems can present problems but also advantages; control coordination is needed between the two different transmission types.
High Voltage Direct Current Transmission Systems 2Mark MaterialsSanthosh Kumar
The document provides information about HVDC transmission, including:
1. It lists two merits of AC transmission (power can be generated at high voltages, maintenance of AC substations is easy and cheaper) and two merits of DC transmission (it requires only two conductors, there is no skin effect).
2. It discusses types of DC link including monopolar, bipolar, and homopolar links.
3. It lists types of power devices used for HVDC transmission including thyristor, IGBT, GTO, LTT, and MCT.
4. It provides advantages and disadvantages of HVDC transmission such as full control over power, reduced transmission lines, and inability to change voltage
voltage stability by compensating reactive powerDurgarao Gundu
This document summarizes a student project report on stabilizing voltage by compensating reactive power. The objectives of the project are to explain how to improve voltage stability by installing sources of reactive power at distribution system buses. Reactive power compensation devices like shunt capacitors, SVCs, and TCRs can directly deliver reactive power to buses to maintain constant voltage despite varying load. The report will simulate and analyze the effects of these devices on voltage stabilization.
The document discusses various methods for controlling voltage in power systems. It describes how voltage control is achieved through tap changing transformers, which can control voltage within a range of +15% to -15%. Both off-load and on-load tap changing are discussed. Shunt reactors and capacitors are used to control voltage by compensating for line inductance and capacitance. Series capacitors are used on long EHV lines to reduce line inductive reactance and increase power transfer capability, but not for direct voltage regulation.
This document provides information about high voltage direct current (HVDC) transmission. It begins with an introduction comparing AC and DC transmission, noting advantages of DC such as fewer conductors required and lack of effects from inductance and capacitance. It then describes types of HVDC links including monopolar, bipolar, and homopolar. Details are given about HVDC converter stations including converter units, valves, transformers, filters, reactive power sources, and smoothing reactors. Multi-terminal HVDC systems and their advantages are outlined. Principles of DC link control through constant current or voltage are summarized.
Reactive power compensation manages reactive power to improve AC power system performance related to load and voltage support. Reactive power compensation devices reduce reactive power flow in grids, lowering energy losses and improving operating conditions. Static VAR compensators (SVCs) are commonly used for reactive power compensation using thyristor-controlled reactors and capacitors to generate or absorb reactive power and regulate voltage. SVCs improve power transmission capability, transient stability, and load power factors to reduce losses and increase system capacity.
Simplified analysis of graetz circuit copy - copyVert Wheeler
The document summarizes the analysis of a Graetz circuit, which is used in HVDC transmission, under two scenarios: without overlap and with overlap between thyristor valves. In the without overlap scenario, the analysis assumes valves switch on and off instantaneously with no two valves on at once. This allows simplifying the circuit to determine voltage and current waveforms. When overlap is considered and two valves can be on simultaneously, the analysis is more complex with different operation modes identified depending on the overlap angle. Key aspects of voltage, current, power factor and harmonics are derived.
This document discusses power semiconducting switches, specifically thyristors. It defines thyristors and lists some common types, including SCRs, GTOs, triacs, and LASCRs. It then focuses on SCRs, describing their structure, characteristics like triggering methods, and important applications. Protection of thyristors is also covered, such as protecting against high di/dt, dv/dt, overvoltage, overcurrent, and noise. Common uses of thyristors include electric vehicle control, switching, HVDC transmission, and industrial applications.
This document provides an overview of EHV AC and DC transmission. It discusses:
1) The construction of EHV AC and DC transmission links, including the components of AC systems and the types of DC links.
2) The limitations and advantages of AC and DC transmission. AC faces challenges with reactive power and stability over long distances, while DC has benefits of lower losses and greater power control.
3) The principal applications of AC and DC transmission, with DC preferred for long distance, asynchronous connections, and submarine cables due to its advantages over AC in these scenarios.
POWER QUALITY IMPROVEMENT BY SSSC AND STATCOM USING PI CONTROLLERJournal For Research
This document summarizes research on using SSSC (Static Synchronous Series Compensator) and STATCOM (Static Synchronous Compensator) to improve power quality and voltage stability in a two machine, four bus power system model. It describes the basic operational principles of SSSC and STATCOM, which are FACTS devices that can be connected in series and parallel, respectively, with transmission lines. The document presents simulation results showing that connecting an SSSC to Bus 2 and a STATCOM to Bus 2 both increase the voltage levels and regulate active and reactive power flows at the different buses, demonstrating the effectiveness of these devices for maintaining voltage stability.
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.
Enhancement of power quality in distribution system using d statcomvasaharish
1) The document discusses a project to enhance power quality in a distribution system using a D-STATCOM. It describes common power quality problems like voltage sags, harmonic distortion, and low power factor.
2) It provides details on the components and operation of a D-STATCOM, which contains a voltage source converter, controller, energy storage circuit, and LCL passive filter.
3) The methodology section describes simulating different fault scenarios in a test system both with and without a D-STATCOM and with or without the LCL filter. The results demonstrate that a D-STATCOM can mitigate voltage sags and an LCL filter reduces harmonic distortion.
This document provides an overview of reactive power compensation. It defines reactive power compensation as any device connected in series or parallel with a load to supply the reactive power demanded. There are two main types of compensation: shunt compensation using parallel capacitors to improve power factor and boost voltage, and series compensation using series capacitors to boost receiving end voltage and transmission capacity. Fixed compensation uses breaker controlled capacitors for constant loads, while dynamic compensation uses thyristor controlled capacitors for fluctuating loads. Benefits include better efficiency, improved voltage, reduced losses and higher load capability. Capacitors are used as they generate reactive power to supply loads.
This document presents an overview of reactive power compensation. It defines reactive power compensation as managing reactive power to improve AC system performance. There are two main aspects: load compensation to increase power factor and voltage regulation, and voltage support to decrease voltage fluctuations. Several methods of reactive power compensation are discussed, including shunt compensation using capacitors and reactors, series compensation, static VAR compensators (SVCs), static compensators (STATCOMs), and synchronous condensers. SVC and STATCOM technologies are compared, with STATCOMs having advantages of smaller components, better control, and transient response.
The document discusses modeling and simulation of a STATCOM (static synchronous compensator) system for improving power quality when supplying an arc furnace, which introduces disturbances. It presents PSCAD models of the electrical network, arc furnace load, 12-pulse and 24-pulse STATCOM configurations, and a measurement system. Simulation results show the STATCOM's effectiveness in compensating for disturbances from the arc furnace load and maintaining good power quality at the point of common coupling.
This document describes a simulation study of a hybrid wind-fuel cell power system with battery energy storage and D-STATCOM for power quality improvement. It includes:
1) Models of the wind turbine generator, solid oxide fuel cell, battery energy storage system, and D-STATCOM power quality device.
2) Control schemes for the grid-side and rotor-side converters of the wind generator based on vector control.
3) A dynamic model and control of the solid oxide fuel cell system including gas flow dynamics and voltage control.
4) Simulation results analyzing the system's performance under unbalanced and nonlinear load conditions to demonstrate the power quality benefits of the D-STATCOM.
power quality improvement in distrution system using D statcom7867867869
The document discusses using a D-STATCOM device to improve power quality issues in distribution systems, such as voltage sags, harmonic distortion, and low power factor. A D-STATCOM injects current into the system using a voltage source converter to regulate voltage and mitigate sags. It can also absorb or generate reactive power to improve power factor and eliminate current harmonics. Simulation results showed the D-STATCOM is effective at mitigating voltage sags and improving power factor when combined with an LCL passive filter.
The document discusses reactive power compensation using a STATCOM. It describes various compensation schemes including shunt capacitors, synchronous condensers, SVCs, and STATCOMs. STATCOMs offer fast response times and can compensate for both lagging and leading reactive power. The document then examines the operating principle, control strategies using variable voltage and phase angle control, simulation circuits, reactive power calculations, voltage and current waveforms, and proposed control strategies for STATCOMs, including decoupling Id and Iq currents to improve system response and stability.
This document discusses reactive power and voltage control in electrical power systems. It defines real and reactive power and explains that reactive power is needed to maintain adequate voltages throughout transmission and distribution systems. Several methods of providing reactive power are described, including synchronous condensers, capacitors, static VAR compensators, and distributed generation. The document also discusses different types of voltage and VAR control and compares characteristics of various reactive power sources.
This document discusses using a STATCOM to improve power quality in a grid-connected wind energy system. A STATCOM is a voltage-source converter that can compensate for voltage fluctuations on AC transmission lines. The document examines power quality issues like voltage variations and harmonics in wind energy systems. It presents test results showing that a STATCOM maintains the source voltage and current in-phase to support the reactive power demand of the wind generator and load. The STATCOM fulfills power quality standards and can eliminate or reduce voltage fluctuations at the plant input.
Recent simulation for Reactive power compensation using STATCOM that is Static Syncronous compensator on MATLAB software. It having lots of advantages over other conventional methods.
STATCOM (Static Synchronous Compensator) is a regulating device used on AC electricity networks to act as a source or sink of reactive power. It improves power quality and voltage stability. A STATCOM uses a voltage source converter to continuously control voltage and smoothly provide reactive power compensation. It responds faster than SVCs and provides better reactive power support at low voltages, making it superior for voltage stability applications.
This document discusses using a D-STATCOM (Distribution Static Synchronous Compensator) to improve power quality and voltage regulation in a photovoltaic (PV) distribution system. The objectives are to analyze the effects of nonlinear loads, study existing harmonics mitigation methods, and propose a best method for compensating reactive power and mitigating current harmonics. It presents the contents, introduces issues like harmonics from power electronic devices and reactive power disturbances. It then describes the operation, topology and components of a D-STATCOM and PV system. MATLAB models of the grid-connected PV system with and without D-STATCOM are presented, showing the D-STATCOM improves power factor and regulates the voltage.
ISO 9000 Quality Management System - A Presentation by Akshay AnandAkshay Anand
The document summarizes key aspects of the ISO9000 quality management standard. It describes the purpose and requirements of ISO9000, including establishing quality management systems to meet customer and regulatory needs. It provides an overview of the history and growth of ISO9000 certification globally. It also outlines the structure, requirements and certification process for ISO9000.
Power Quality is a combination of Voltage profile, Frequency profile, Harmonics contain and reliability of power supply.
The Power Quality is defined as the degree to which the power supply approaches the ideal case of stable, uninterrupted, zero distortion and disturbance free supply.
Injection of the wind power into an electric grid affects the power quality. The performance of the wind turbine and thereby power quality are determined on the basis of measurements and the norms followed according to the guideline specified in International Electro-technical Commission standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical behavior of switching operation and these are measured according to national/international guidelines. The paper study demonstrates the power quality problem due to installation of wind turbine with the grid. In this proposed scheme STATic COMpensator (STATCOM) is connected at a point of common coupling with a battery energy storage system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the real power source under fluctuating wind power. The STATCOM control scheme for the grid connected wind energy generation system for power quality improvement is simulated using MATLAB/SIMULINK in power system block set. The effectiveness of the proposed scheme relives the main supply source from the reactive power demand of the load and the induction generator. The development of the grid co-ordination rule and the scheme for improvement in power quality norms as per IEC-standard on the grid has been presented.
The document discusses power factor correction and reactive power compensation. It mentions issues like reactive power burden, high harmonic currents, unbalanced loads, and excessive neutral currents. It also discusses different reactive power compensation techniques like thyristor controlled reactor, thyristor switched capacitor, static VAR compensator, and advanced static VAR compensator. The document recommends checking www.techalone.com for seminar and paper presentation topics on electrical engineering issues like power factor correction, harmonics compensation, load balancing, voltage regulation, and neutral current compensation.
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Design and Analysis of Adaptive Neural Controller for Voltage Source Converte...IDES Editor
Usually a STATCOM is installed to support power
system networks that have a poor power factor and often poor
voltage regulation. It is based on a power electronics voltagesource
converter. Various PWM techniques make selective
harmonic elimination possible, which effectively control the
harmonic content of voltage source converters. The distribution
systems have to supply unbalanced nonlinear loads transferring
oscillations to the DC-side of the converter in a realistic
operating condition. Thus, additional harmonics are modulated
through the STATCOM at the point of common coupling
(PCC). This requires more attention when switching angles are
calculated offline using the optimal PWM technique. This
paper, therefore, presents the artificial neural network model
for defining the switching criterion of the VSC for the
STATCOM in order to reduce the total harmonic distortion
(THD) of the injected line current at the PCC. The model takes
into the account the dc capacitor effect, effects of other possible
varying parameters such as voltage unbalance as well as
network harmonics. A reference is developed for offline
prediction and then implemented with the help of back
propagation technique.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Application of Multilevel Voltage-Source-Converter in FACTS Devices for Power...IJMER
This document discusses a study on applying a multilevel voltage-source converter (VSC) in flexible AC transmission systems (FACTS) devices for power system voltage control and reactive power compensation. Specifically, it proposes a sixty pulse VSC STATCOM design that combines a twelve pulse converter with a five-level voltage source inverter (VSI) to improve performance. The study finds that the multilevel VSI STATCOM is able to provide satisfactory reactive power flow control and respond quickly to changes in reactive current reference. THD is also maintained within acceptable limits. FACTS devices using power electronics, such as STATCOMs, help enhance power transfer capability, flexibility and stability in transmission networks.
Real and Reactive Power Compensation by using Diode Clamped Multilevel Invert...IRJET Journal
This document discusses using a diode-clamped multilevel inverter based STATCOM to provide both real and reactive power compensation on a transmission line. A STATCOM is a shunt connected device that can regulate voltage and provide reactive power support. A diode-clamped multilevel inverter is proposed for the STATCOM due to its ability to generate stepped voltage waveforms with lower harmonic distortion compared to a two-level inverter. Simulation results using MATLAB/Simulink show that the multilevel inverter based STATCOM can effectively regulate the voltage and maintain stability of the load while supplying real and reactive power to the transmission line.
This document presents a control scheme for a D-STATCOM (distribution static compensator) to compensate for power factor and harmonic current in an electric power distribution system. It begins by introducing D-STATCOM technology and its role in providing reactive power support and voltage regulation on distribution feeders. It then describes the proposed control scheme, which is based on instantaneous power theory and aims to make the source current purely sinusoidal with unity power factor. Simulation results are presented comparing the proposed control scheme to an existing one, showing the new scheme achieves unity power factor compensation after a load is switched on.
This document presents a new control scheme for a STATCOM (Static Synchronous Compensator) to improve power quality in a grid-connected wind energy system. A STATCOM equipped with a battery energy storage system is connected at the point of common coupling between the wind farm and the grid. The STATCOM control scheme uses a hysteresis current control technique to inject compensating current and regulate the grid voltage. Simulation results show the STATCOM can mitigate reactive power demand and harmonics, as well as respond quickly to changes in load to help regulate voltage and current waveforms at the point of connection to the grid.
Improved Power Quality by using STATCOM Under Various Loading ConditionsIJMTST Journal
This document discusses improving power quality using a STATCOM under various loading conditions. It first provides background on power quality issues and defines STATCOM. It then describes the system topology which includes a wind energy generation system connected to the grid along with a STATCOM and battery energy storage system. Two control schemes for the STATCOM are proposed: Bang-Bang current control and fuzzy logic control. Simulation results using MATLAB/Simulink are presented for various cases including balanced/unbalanced linear and non-linear loads, showing the STATCOM is able to mitigate power quality issues and regulate voltage.
Enhancement of Power System Dynamics Using a Novel Series Compensation SchemeIJMER
Phase imbalanced capacitive compensation is a “hybrid” series compensation scheme, where the
series capacitive compensation in one phase is created using a single-phase TCSC in series with a fixed capacitor
(Cc), and the other two phases are compensated by fixed series capacitors (C). The TCSC control is initially set
such that its equivalent compensations at the power frequency combined with the fixed capacitor yield a
resultant compensation equal to the other two phases. Thus, the phase balance is maintained at the power
frequency while at any other frequency, a phase imbalance is created. The effectiveness of the scheme in damping
power system oscillations for various network conditions, namely different system faults and tie-line power flows is
evaluated using the MATLAB/SIMULINK Software
An Approach of D-STATCOM in Single Phase System with Power Quality ImprovementIJERA Editor
The paper describes the design of D-STATCOM in single phase for voltage interruption mitigation of fault in an unbalance system. Speed of response is higher than static var compensator (SVC) and harmonic emission is less than SVC that is why D-STATCOM is used in place of static var compensator. It validates the performance of D-STATCOM for improving power quality and harmonics. It provides a guide for utilities to have an appropriate choice of FACTS devices for enhancing stability. The work proposes a two pulse STATCOM configurations in which voltage source inverter uses IGBT as a switching device have been simulated using MATLAB/SIMULINK. Accordingly, simulation is first carried out to illustrate use of D-STATCOM in mitigating voltage interruption in single phase. The scope of the paper is to explore the D-STATCOM in single phase. Normally, D-STATCOM is not used in single phase, so an attempt has been made to introduce DSTATCOM in single phase load or household applications. Simulation results of 3KVAR D-STATCOM validate that integrated D-STATCOM with 230V, 91μF capacitor is suited for single phase system with voltage interruption mitigation capacit
1.compensation of reactive power using d statcom in grid interfaced pv systemEditorJST
This document summarizes a research paper on using a D-STATCOM (Distribution Static Compensator) with an LCL passive filter to compensate for reactive power and improve power quality in a grid-interfaced photovoltaic (PV) system. The D-STATCOM injects current to mitigate voltage fluctuations. Simulation results show improvements in three-phase output voltage at the transmission and distribution levels as well as increased power generation from both the transmission system and PV system. In conclusion, the integration of FACTS devices like the D-STATCOM can help maintain desired power quality standards while reducing distortions and improving the power factor.
IJERD(www.ijerd.com)International Journal of Engineering Research and Develop...IJERD Editor
1) The document describes modeling and simulation of a DSTATCOM (distribution static synchronous compensator) to improve power quality in a distribution system feeding both linear and non-linear loads.
2) A MATLAB/Simulink model of a DSTATCOM power circuit and control system is developed. Simulation results under different load conditions are presented to demonstrate the DSTATCOM's ability to provide power factor correction, harmonic compensation, and reactive power support.
3) Key findings include that the DSTATCOM can balance unbalanced loads, improve the source power factor to unity, and regulate voltages under transient conditions like load changes within one cycle.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
International Journal of Engineering Research and Development is an international premier peer reviewed open access engineering and technology journal promoting the discovery, innovation, advancement and dissemination of basic and transitional knowledge in engineering, technology and related disciplines.
We follow "Rigorous Publication" model - means that all articles appear on IJERD after full appraisal, effectiveness, legitimacy and reliability of research content. International Journal of Engineering Research and Development publishes papers online as well as provide hard copy of Journal to authors after publication of paper. It is intended to serve as a forum for researchers, practitioners and developers to exchange ideas and results for the advancement of Engineering & Technology.
REDUCING SOURCE CURRENT HARMONICS DUE TO BALANCED AND UN-BALANCED VOLTAGE VAR...IJCI JOURNAL
This document summarizes a research paper that examines reducing current harmonics due to voltage variations using a fuzzy-controlled D-STATCOM. It begins with an introduction that describes the increasing need for power quality improvements and custom power devices. It then provides details on the principal and control strategy of a D-STATCOM, which uses a voltage source converter to inject current and regulate voltage. The proposed method uses an instant power theory with fuzzy logic control of the D-STATCOM to generate reference currents, providing better compensation than a proportional-integral controller. Simulation results showed the fuzzy control approach more accurately compensated for distorted currents and reactive power under both steady and transient states.
This document presents a study on using a multi-level inverter based DSTATCOM (distributed static synchronous compensator) and DVR (dynamic voltage restorer) with a neuro-fuzzy controller to improve power quality by mitigating voltage sags. It proposes a cascaded multilevel inverter topology with isolated DC energy storage and reduced switches. Simulation results show the MLI-based DSTATCOM and DVR can compensate voltage sags by injecting current and voltage respectively to regulate the bus voltage. The output with compensation has 1500V voltage compared to 1000V without compensation during a 500V sag.
IRJET - Review Paper on RSC-MLC Base Smart PV-DSTATCOM for Multi Objective Pu...IRJET Journal
This document summarizes research on using a Real Switch Count Multi-Level Converter (RSC-MLC) based smart PV-DSTATCOM for multiple objectives including improving power quality, compensating reactive power flow, and optimizing the DC link voltage. A DSTATCOM uses a voltage source converter to inject current and control reactive power flow. The proposed method uses an RSC-MLC to regulate the DC link voltage from a PV source, reducing voltage stress on switches and minimizing losses. It can supply solar power to loads and compensate reactive power with battery support when solar power is unavailable. The document reviews related work on DSTATCOM control and applications and provides details on controlling the proposed RSC-MLC based PV-
NEW STATCOM CONTROL SCHEME FOR POWER QUALITY IMPROVEMENT IN WIND FARM.sannuthi yaramapu
Now a days we are facing so many problems with power quality issues. So in order to mitigate these problems and to improve the power quality we are using new STATCOM control scheme in wind farm.
IRJET- Analysis of Open Loop Distribution Static Compensator for Improvin...IRJET Journal
This document discusses the analysis and simulation of an open loop distribution static compensator (D-STATCOM) for improving power quality in a distribution system. Key points:
1. A D-STATCOM model is developed in MATLAB Simulink to compensate for reactive power demand from nonlinear and unbalanced loads, improve source power factor, and reduce total harmonic distortion in source currents.
2. Simulation results show that before compensation, source currents are unbalanced and distorted due to nonlinear loads. The D-STATCOM is able to maintain unity power factor at the source and mitigate harmonics after compensation.
3. Operating modes of the D-STATCOM include reactive power compensation to regulate voltage, and active power compensation
1. The document describes a five-level cascaded H-bridge inverter used as a distribution static compensator (DSTATCOM) to compensate for reactive power and harmonics in a power system.
2. A DSTATCOM is connected in shunt with the distribution system and uses a voltage source converter to generate a set of three-phase output voltages that can be adjusted to control the exchange of active and reactive power with the system.
3. The five-level cascaded H-bridge inverter topology reduces device voltage stress and output harmonics. Level shifted pulse width modulation and phase shifted pulse width modulation techniques are investigated for controlling the DSTATCOM.
Design modelling and Simulation of DSTATCOM for distribution lines for power ...CHRAMIREDDY2
This document discusses the design, modeling, and simulation of a DSTATCOM (distribution static synchronous compensator) to improve power quality on distribution lines. It presents a study on modeling a STATCOM used for reactive power compensation. A three-phase IGBT-based voltage source inverter known as a DSTATCOM is used for power factor correction, harmonic compensation, and providing reactive power to loads. A model of a DSTATCOM connected to a distribution system feeding linear and non-linear loads is developed in MATLAB to analyze system behavior under transient conditions. The performance of the DSTATCOM is investigated under various fault conditions.
Similar to Shunt Compensation for Power Quality Improvement using a STATCOM Controller (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.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
Introducing Milvus Lite: Easy-to-Install, Easy-to-Use vector database for you...Zilliz
Join us to introduce Milvus Lite, a vector database that can run on notebooks and laptops, share the same API with Milvus, and integrate with every popular GenAI framework. This webinar is perfect for developers seeking easy-to-use, well-integrated vector databases for their GenAI apps.
Full-RAG: A modern architecture for hyper-personalizationZilliz
Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
Leonard Jayamohan, Partner & Generative AI Lead, Deloitte
This keynote will reveal how Deloitte leverages Neo4j’s graph power for groundbreaking digital twin solutions, achieving a staggering 100x performance boost. Discover the essential role knowledge graphs play in successful generative AI implementations. Plus, get an exclusive look at an innovative Neo4j + Generative AI solution Deloitte is developing in-house.
“An Outlook of the Ongoing and Future Relationship between Blockchain Technologies and Process-aware Information Systems.” Invited talk at the joint workshop on Blockchain for Information Systems (BC4IS) and Blockchain for Trusted Data Sharing (B4TDS), co-located with with the 36th International Conference on Advanced Information Systems Engineering (CAiSE), 3 June 2024, Limassol, Cyprus.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
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.
UiPath Test Automation using UiPath Test Suite series, part 5DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 5. In this session, we will cover CI/CD with devops.
Topics covered:
CI/CD with in UiPath
End-to-end overview of CI/CD pipeline with Azure devops
Speaker:
Lyndsey Byblow, Test Suite Sales Engineer @ UiPath, Inc.
Maruthi Prithivirajan, Head of ASEAN & IN Solution Architecture, Neo4j
Get an inside look at the latest Neo4j innovations that enable relationship-driven intelligence at scale. Learn more about the newest cloud integrations and product enhancements that make Neo4j an essential choice for developers building apps with interconnected data and generative AI.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Unlock the Future of Search with MongoDB Atlas_ Vector Search Unleashed.pdfMalak Abu Hammad
Discover how MongoDB Atlas and vector search technology can revolutionize your application's search capabilities. This comprehensive presentation covers:
* What is Vector Search?
* Importance and benefits of vector search
* Practical use cases across various industries
* Step-by-step implementation guide
* Live demos with code snippets
* Enhancing LLM capabilities with vector search
* Best practices and optimization strategies
Perfect for developers, AI enthusiasts, and tech leaders. Learn how to leverage MongoDB Atlas to deliver highly relevant, context-aware search results, transforming your data retrieval process. Stay ahead in tech innovation and maximize the potential of your applications.
#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology