The document provides information about a PowerPoint presentation on Distributed Static Compensator (D-STATCOM) given by Sheikh Mohammad Sajid. It introduces D-STATCOM as a device used to mitigate current-based power quality problems at the distributed level. It discusses various classifications, topologies, components, control strategies and objectives of D-STATCOM, including reactive power compensation, load balancing and harmonic suppression. The key principles of operation involve injecting compensating currents from a voltage source converter to regulate voltage at the point of common coupling.
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.
A Voltage Controlled Dstatcom for Power Quality Improvementiosrjce
Due to increasing complexity in the power system, voltage sag is becoming one of the most significant
power quality problems. Voltage sag is a short reduction voltage from nominal voltage, occurs in a short time.
If the voltage sags exceed two to three cycles, then manufacturing systems making use of sensitive electronic
equipments are likely to be affected leading to major problems. It ultimately leads to wastage of resources (both
material and human) as well as financial losses. This is possible only by ensuring that uninterrupted flow of
power is maintained at proper voltage levels. This project tends look at the solving the sag problems by using
custom power devices such as Distribution Static compensator (D-STATCOM).Proposed scheme follows a new
algorithm to generate reference voltage for a distribution static compensator (DSTATCOM) operating in
voltage-control mode. The proposed scheme ensures that unity power factor (UPF) is achieved at the load
terminal during nominal operation, which is not possible in the traditional method. Also, the compensator
injects lower currents therefore, reduces losses in the feeder and voltage-source inverter. Further, a saving in
the rating of DSTATCOM is achieved which increases its capacity to mitigate voltage sag. Nearly UPF is
maintained, while regulating voltage at the load terminal, during load change. The state-space model of
DSTATCOM is incorporated with the deadbeat predictive controller for fast load voltage regulation during
voltage disturbances. With these features, this scheme allows DSTATCOM to tackle power-quality issues by
providing power factor correction, harmonic elimination, load balancing, and voltage regulation based on the
load requirement.
6.flexible d statcom performance as a flexible distributed generation in miti...Hemanth Yadavalli
This document proposes a flexible D-STATCOM (FD-STATCOM) system that can both mitigate power quality issues caused by faults like line-to-line and double line-to-ground faults, and act as a distributed generator by supplying power to sensitive loads when the main utility source is disconnected. It describes the FD-STATCOM's ability to mitigate voltage sags under different fault conditions and while in islanding mode. The paper also presents a new control method for the FD-STATCOM to mitigate voltage sags caused by faults and islanding.
Performance Comparison of VSI Based DSTATCOM and ZSI Based DSTATCOM in A Dist...ruban8
Performance Comparison of VSI Based DSTATCOM and ZSI Based DSTATCOM in A Distribution System Network---D-STATCOM (Distribution Static Compensator) is a shunt device which is generally used to improve power quality of distribution systems. It is a device applied for correcting power factor, maintaining constant distribution voltage and mitigating current harmonics in a distribution network. In this paper, effort has been made to use ZSI based D-STATCOM in distribution system and its performance has been compared to VSI based DSTATCOM. The MATLAB/SIMULINK models have been developed to draw the conclusions.
http://www.iosrjournals.org/iosr-jeee/Papers/Vol9-issue6/Version-3/E09633035.pdf
Simulation and Analysis of a D-STATCOM for Load Compensation and Power Facto...IJMER
Power Generation and Transmission is a complex process, requiring the working of many
components of the power system in tandem to maximize the output. One of the main components to form
a major part is the reactive power in the system. It is required to maintain the voltage to deliver the
active power through the lines. Loads like motor loads and other loads require reactive power for their
operation. To improve the performance of ac power systems, we need to manage this reactive power in
an efficient way and this is known as reactive power compensation. In developing countries like India,
where the variation of power frequency and many such other determinants of power quality are
themselves a serious question, it is very vital to take positive steps in this direction.
The work presented here illustrates a method to compensate for the load reactive power using a
DSTATCOM
A DSTATCOM injects a current into the system to provide for the reactive component of the load
current. The validity of proposed method and achievement of desired compensation are confirmed by
the results of the simulation in MATLAB/ Simulink.
Enhancement of power quality in distribution system by using D-STATCOMEng Ahmed Salad Osman
The document is a thesis submitted by three students for their Bachelor's degree in Electrical Engineering. It discusses enhancing power quality in a distribution system using a D-STATCOM (Distribution Static Compensator). The thesis is classified as confidential and contains restricted information as specified by the University of Hormuud. The students declare the work as their own, and acknowledge the university's rights over the thesis.
The document provides information about a PowerPoint presentation on Distributed Static Compensator (D-STATCOM) given by Sheikh Mohammad Sajid. It introduces D-STATCOM as a device used to mitigate current-based power quality problems at the distributed level. It discusses various classifications, topologies, components, control strategies and objectives of D-STATCOM, including reactive power compensation, load balancing and harmonic suppression. The key principles of operation involve injecting compensating currents from a voltage source converter to regulate voltage at the point of common coupling.
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.
A Voltage Controlled Dstatcom for Power Quality Improvementiosrjce
Due to increasing complexity in the power system, voltage sag is becoming one of the most significant
power quality problems. Voltage sag is a short reduction voltage from nominal voltage, occurs in a short time.
If the voltage sags exceed two to three cycles, then manufacturing systems making use of sensitive electronic
equipments are likely to be affected leading to major problems. It ultimately leads to wastage of resources (both
material and human) as well as financial losses. This is possible only by ensuring that uninterrupted flow of
power is maintained at proper voltage levels. This project tends look at the solving the sag problems by using
custom power devices such as Distribution Static compensator (D-STATCOM).Proposed scheme follows a new
algorithm to generate reference voltage for a distribution static compensator (DSTATCOM) operating in
voltage-control mode. The proposed scheme ensures that unity power factor (UPF) is achieved at the load
terminal during nominal operation, which is not possible in the traditional method. Also, the compensator
injects lower currents therefore, reduces losses in the feeder and voltage-source inverter. Further, a saving in
the rating of DSTATCOM is achieved which increases its capacity to mitigate voltage sag. Nearly UPF is
maintained, while regulating voltage at the load terminal, during load change. The state-space model of
DSTATCOM is incorporated with the deadbeat predictive controller for fast load voltage regulation during
voltage disturbances. With these features, this scheme allows DSTATCOM to tackle power-quality issues by
providing power factor correction, harmonic elimination, load balancing, and voltage regulation based on the
load requirement.
6.flexible d statcom performance as a flexible distributed generation in miti...Hemanth Yadavalli
This document proposes a flexible D-STATCOM (FD-STATCOM) system that can both mitigate power quality issues caused by faults like line-to-line and double line-to-ground faults, and act as a distributed generator by supplying power to sensitive loads when the main utility source is disconnected. It describes the FD-STATCOM's ability to mitigate voltage sags under different fault conditions and while in islanding mode. The paper also presents a new control method for the FD-STATCOM to mitigate voltage sags caused by faults and islanding.
Performance Comparison of VSI Based DSTATCOM and ZSI Based DSTATCOM in A Dist...ruban8
Performance Comparison of VSI Based DSTATCOM and ZSI Based DSTATCOM in A Distribution System Network---D-STATCOM (Distribution Static Compensator) is a shunt device which is generally used to improve power quality of distribution systems. It is a device applied for correcting power factor, maintaining constant distribution voltage and mitigating current harmonics in a distribution network. In this paper, effort has been made to use ZSI based D-STATCOM in distribution system and its performance has been compared to VSI based DSTATCOM. The MATLAB/SIMULINK models have been developed to draw the conclusions.
http://www.iosrjournals.org/iosr-jeee/Papers/Vol9-issue6/Version-3/E09633035.pdf
Simulation and Analysis of a D-STATCOM for Load Compensation and Power Facto...IJMER
Power Generation and Transmission is a complex process, requiring the working of many
components of the power system in tandem to maximize the output. One of the main components to form
a major part is the reactive power in the system. It is required to maintain the voltage to deliver the
active power through the lines. Loads like motor loads and other loads require reactive power for their
operation. To improve the performance of ac power systems, we need to manage this reactive power in
an efficient way and this is known as reactive power compensation. In developing countries like India,
where the variation of power frequency and many such other determinants of power quality are
themselves a serious question, it is very vital to take positive steps in this direction.
The work presented here illustrates a method to compensate for the load reactive power using a
DSTATCOM
A DSTATCOM injects a current into the system to provide for the reactive component of the load
current. The validity of proposed method and achievement of desired compensation are confirmed by
the results of the simulation in MATLAB/ Simulink.
Enhancement of power quality in distribution system by using D-STATCOMEng Ahmed Salad Osman
The document is a thesis submitted by three students for their Bachelor's degree in Electrical Engineering. It discusses enhancing power quality in a distribution system using a D-STATCOM (Distribution Static Compensator). The thesis is classified as confidential and contains restricted information as specified by the University of Hormuud. The students declare the work as their own, and acknowledge the university's rights over the thesis.
This presentation discusses power quality improvement in small isolated distribution systems using a DSTATCOM (Distribution Static Compensator) with fuzzy logic control. It aims to regulate voltage, reduce harmonics, correct power factor, and balance loads. The system contains a DSTATCOM connected in parallel to regulate voltage and correct power factor as loads change. Simulation results show the DSTATCOM improves power quality by correcting power factor, balancing loads, and regulating voltage under different load conditions using both PI and fuzzy logic controllers. The presentation concludes fuzzy logic control of a DSTATCOM is effective for power quality improvement in small isolated power systems like ships, islands, and remote generation sites.
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.
Design of self tuning pi controller for statcom using bats echolocation algor...g.kumaravel
The document describes a study that designed a self-tuning PI controller for a Static Synchronous Compensator (STATCOM) using a Bats Echolocation Algorithm (BEA). A STATCOM is a Flexible AC Transmission Systems device that helps maintain power system stability. The proposed BEA was used to optimize the PI controller gains to regulate the load bus voltage for a power system configuration that included a STATCOM. Digital simulations showed the self-tuning PI controller using the BEA had a faster dynamic response in maintaining the load bus voltage compared to a fixed gain PI controller, especially for a non-linear load.
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 summarizes a study on using STATCOM (Static Synchronous Compensator), a FACTS (Flexible AC Transmission Systems) device, to improve the voltage profile of a power system. STATCOM is a shunt device that can regulate reactive power flow independently of system parameters. The study models a 5-bus system in MATLAB and finds that installing STATCOM at bus 4 results in the minimum voltage deviation and best performance compared to buses 2 and 5. In conclusion, implementing STATCOM can help utilize existing transmission infrastructure more efficiently by reducing losses and improving voltage stability.
UPQC a novel method to efficiently utilize Sustainable / Alternate Energy Sources is a presentation about power quality issues and solutions. It discusses different power quality problems such as voltage sags, swells, harmonics, and reactive power issues. It then introduces several custom power devices that can address these problems including the STATCOM, DVR, and UPQC. The UPQC is described as an active series-shunt power line conditioner that can compensate for various power quality issues such as voltage sags/swells, imbalance, flicker, and harmonics. The presentation concludes by discussing future trends in power semiconductor switches and the balanced application of these new technologies.
This document summarizes a research paper that proposes a power quality enhancement technique for a grid-connected hybrid power system using a distributed power flow controller (DPFC) with a coordinated power quality (PQ) theory and fractional order PID controller. The DPFC consists of both shunt and series controllers to mitigate voltage sags, swells, and current harmonics in the distribution system. Simulation results show that the proposed DPFC with FOPID controller provides better voltage profile improvement and compensation compared to controllers like PI, FUZZY, and ANFIS. A case study on an IEEE 12 bus system also demonstrates the superior performance of the DPFC in terms of voltage compensation and harmonics reduction.
This document presents information on power quality conditioners. It defines power quality and discusses various types of power quality conditioners, including DSTATCOM, active power filters, and UPQC. DSTATCOM uses a voltage source converter to regulate voltage and improve power quality. Active power filters come in shunt, series, and hybrid configurations to compensate for reactive power, harmonics, and voltage issues. UPQC combines shunt and series active power filters to compensate for both voltage and current problems. Maintaining good power quality is important for economic system operation.
Harmonics created by nonlinear loads such as arc furnaces, cycloconverters and motor drives destroys the power quality in the system. They not only affect the working of adjacent loads but also shorten the life of power equipment by creating excessive losses. ‘Shunt Active Power Filter’ is a modern addition to family of compensating devices. It has superior qualities over its contemporaries namely SVCs and STATCOMs. It not only mitigates harmonics within the allowable limits defined by IEEE Std 519-1992, but also compensates unbalancing and reactive power in the system. Consequently, only active power is supplied by the source thus power factor approaches unity. A fully functional Simulink model of Shunt Active Power Filter has been designed based on ‘Instantaneous Power Theory’ or ‘p-q Theory’. The results of simulation comply with all the features described by the theory, justifying employment of SAPF in the industry.
Power Quality Improvement by UPQC based on Voltage Source ConvertersIJRST Journal
In modern power system consists of wide range of electrical, electronic and power electronic equipment in commercial and industrial applications. Since most of the electronic equipment’s are nonlinear in nature these will induce harmonics in the system, which affect the sensitive loads to be fed from the system. These problems are partially solved with the help of LC passive filters. However, this kind of filter cannot solve random variation in the load current wave form and voltage wave form. Active filters can resolve this problem. However, the cost of active filters is high. They are difficult to implement in large scale. Additionally, they also present lower efficiency than shunt passive filters. One of the many solutions is the use of a combined system of shunt and active series filters like Unified Power Quality Conditioner (UPQC) which aims at achieving a low cost under highly effective control. The UPQC device combines a shunt active filter together with a series active filter in a back-to-back configuration, to simultaneously compensate the supply voltage and the load current or to mitigate any type of voltage and current fluctuations and power factor correction in a power distribution network, such that improved power quality can be made available at the point of common coupling. The control strategies are modeled using MATLAB/SIMULINK. The performance is also observed under influence of utility side disturbances such as harmonics and voltage sags. The simulation results are compared without and with UPQC for the verification of results.
The document provides an introduction to power system analysis. It discusses the components of a power system including generators, transformers, transmission lines and loads. It explains that power system analysis involves monitoring the system through load flow analysis, short circuit analysis and stability analysis in order to maintain the system safely and economically. It also discusses the need for power system analysis in planning and operating the system, and ensuring power demand is met through reliable generation and transmission of electricity.
The document discusses using a STATCOM and battery energy storage system to improve power quality from a grid-connected wind energy system. It proposes a control scheme where the STATCOM injects current to cancel out reactive and harmonic parts of current from the induction generator and nonlinear load. It presents the system topology, operation, bang-bang controller for the STATCOM, and simulation results showing the STATCOM reduces total harmonic distortion of source current from 4.06% to 0.40%, improving power quality. The document concludes that the STATCOM-BESS control system eliminates harmonic load current and maintains unity power factor and in-phase voltages and currents at the source.
Statcom control scheme for power quality improvement of grid connected wind e...Kinnera Kin
This project aims to improve power quality for a grid-connected wind energy system using a STATCOM. The objectives are to maintain unity power factor at the source, meet reactive power needs of the wind generator and non-linear load, and provide fast response using hysteresis current control for the STATCOM. MATLAB/Simulink software is used to simulate the system both with and without STATCOM. The simulation results show that with STATCOM, harmonic distortion is eliminated in the load current and power quality is maintained at the point of common coupling.
Unified power quality conditioner for compensating power quality problem adIAEME Publication
This document describes a proposed Adaptive Neuro-Fuzzy Inference System (ANFIS) based Unified Power Quality Conditioner (UPQC) to improve power quality compensation performance. A UPQC uses two voltage source inverters to compensate for both voltage and current disturbances but has high DC link capacitor discharge times. The proposed system adds an ANFIS device to generate a bias voltage that maintains the DC link voltage at a lower level. ANFIS combines neural networks and fuzzy logic to approximate nonlinear functions from numerical and linguistic data. The generated fuzzy rules are trained using a neural network to produce the desired output. Analysis shows the proposed ANFIS-based UPQC provides better power quality compensation than controllers using neural networks,
This document describes a project to improve power quality using a Unified Power Quality Conditioner (UPQC). The UPQC compensates for voltage disturbances and improves current quality using active power filters. It maintains the load voltage despite supply variations. The document outlines the objectives, introduces UPQC components like the shunt and series active power filters, and describes the multivariable controller and Simulink model. The UPQC provides advantages like reduced harmonics, improved waveform quality, and balanced power factor.
Power quality improvement using upqc with soft computing method: Fuzzy logicSakti Prasanna Muduli
Now a days problems regarding power quality is more in large inter connected power systems. There are many method to mitigate these problems but using the latest most efficient compensation method is some what impressive. Here is the brief explanations regarding UPQC using soft computing method(fuzzy logic). This was my academic project along with my friends.
APPLICATION OF STATCOM to IMPROVED DYNAMIC PERFORMANCE OF POWER SYSTEMijsrd.com
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind Farms is investigated .The essential feature of the STATCOM is that it has the ability to absorb or inject fastly the reactive power with power grid . Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the power system having wind farm after occurring severe disturbance such as faults or wind farm mechanical power variation is obtained with STATCOM controller . The dynamic model of the power system having wind farm controlled by proposed STATCOM is developed . To validate the powerful of the STATCOM FACTS controller, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability.
Improvement of power quality has to be treated as a matter of at most importance in the open
market economy due to the increased use of non linear loads. Several devices have been used to mitigate
the power quality problems. Now a days researchers are concentrating on the use of FACT devices to
overcome power quality issues. Unified Power Quality Conditioner is one among such FACT devices upon
which this paper has concentrated for mitigating the Power Quality problems. Here a 3 phase 3 wire
UPQC is realised using MATLAB/SIMULINK to mitigate voltage sag and swell as well as to maintain
sinusoidal voltage and current at PCC irrespective of load dynamics.
A STATCOM (static synchronous compensator) is a shunt compensation device that can regulate voltage by providing or absorbing reactive power. It uses a voltage source converter to generate a voltage in quadrature with the line current to exchange reactive power with the power system independently of the system frequency. STATCOMs have faster response times than traditional compensation devices, allow active power control with storage, and provide compensation without requiring large capacitor banks or reactors. They can help improve voltage stability in power grids by injecting reactive power to maintain voltages.
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.
It mainly explains about generation of electricity using floating hydro turbine using spring suspension system .The main important factor is the turbine generates electricity when the wave enter and leave the coast.In this the design is also explained about each and every part in the following PPT
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help alleviate symptoms of mental illness and boost overall mental well-being.
This presentation discusses power quality improvement in small isolated distribution systems using a DSTATCOM (Distribution Static Compensator) with fuzzy logic control. It aims to regulate voltage, reduce harmonics, correct power factor, and balance loads. The system contains a DSTATCOM connected in parallel to regulate voltage and correct power factor as loads change. Simulation results show the DSTATCOM improves power quality by correcting power factor, balancing loads, and regulating voltage under different load conditions using both PI and fuzzy logic controllers. The presentation concludes fuzzy logic control of a DSTATCOM is effective for power quality improvement in small isolated power systems like ships, islands, and remote generation sites.
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.
Design of self tuning pi controller for statcom using bats echolocation algor...g.kumaravel
The document describes a study that designed a self-tuning PI controller for a Static Synchronous Compensator (STATCOM) using a Bats Echolocation Algorithm (BEA). A STATCOM is a Flexible AC Transmission Systems device that helps maintain power system stability. The proposed BEA was used to optimize the PI controller gains to regulate the load bus voltage for a power system configuration that included a STATCOM. Digital simulations showed the self-tuning PI controller using the BEA had a faster dynamic response in maintaining the load bus voltage compared to a fixed gain PI controller, especially for a non-linear load.
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 summarizes a study on using STATCOM (Static Synchronous Compensator), a FACTS (Flexible AC Transmission Systems) device, to improve the voltage profile of a power system. STATCOM is a shunt device that can regulate reactive power flow independently of system parameters. The study models a 5-bus system in MATLAB and finds that installing STATCOM at bus 4 results in the minimum voltage deviation and best performance compared to buses 2 and 5. In conclusion, implementing STATCOM can help utilize existing transmission infrastructure more efficiently by reducing losses and improving voltage stability.
UPQC a novel method to efficiently utilize Sustainable / Alternate Energy Sources is a presentation about power quality issues and solutions. It discusses different power quality problems such as voltage sags, swells, harmonics, and reactive power issues. It then introduces several custom power devices that can address these problems including the STATCOM, DVR, and UPQC. The UPQC is described as an active series-shunt power line conditioner that can compensate for various power quality issues such as voltage sags/swells, imbalance, flicker, and harmonics. The presentation concludes by discussing future trends in power semiconductor switches and the balanced application of these new technologies.
This document summarizes a research paper that proposes a power quality enhancement technique for a grid-connected hybrid power system using a distributed power flow controller (DPFC) with a coordinated power quality (PQ) theory and fractional order PID controller. The DPFC consists of both shunt and series controllers to mitigate voltage sags, swells, and current harmonics in the distribution system. Simulation results show that the proposed DPFC with FOPID controller provides better voltage profile improvement and compensation compared to controllers like PI, FUZZY, and ANFIS. A case study on an IEEE 12 bus system also demonstrates the superior performance of the DPFC in terms of voltage compensation and harmonics reduction.
This document presents information on power quality conditioners. It defines power quality and discusses various types of power quality conditioners, including DSTATCOM, active power filters, and UPQC. DSTATCOM uses a voltage source converter to regulate voltage and improve power quality. Active power filters come in shunt, series, and hybrid configurations to compensate for reactive power, harmonics, and voltage issues. UPQC combines shunt and series active power filters to compensate for both voltage and current problems. Maintaining good power quality is important for economic system operation.
Harmonics created by nonlinear loads such as arc furnaces, cycloconverters and motor drives destroys the power quality in the system. They not only affect the working of adjacent loads but also shorten the life of power equipment by creating excessive losses. ‘Shunt Active Power Filter’ is a modern addition to family of compensating devices. It has superior qualities over its contemporaries namely SVCs and STATCOMs. It not only mitigates harmonics within the allowable limits defined by IEEE Std 519-1992, but also compensates unbalancing and reactive power in the system. Consequently, only active power is supplied by the source thus power factor approaches unity. A fully functional Simulink model of Shunt Active Power Filter has been designed based on ‘Instantaneous Power Theory’ or ‘p-q Theory’. The results of simulation comply with all the features described by the theory, justifying employment of SAPF in the industry.
Power Quality Improvement by UPQC based on Voltage Source ConvertersIJRST Journal
In modern power system consists of wide range of electrical, electronic and power electronic equipment in commercial and industrial applications. Since most of the electronic equipment’s are nonlinear in nature these will induce harmonics in the system, which affect the sensitive loads to be fed from the system. These problems are partially solved with the help of LC passive filters. However, this kind of filter cannot solve random variation in the load current wave form and voltage wave form. Active filters can resolve this problem. However, the cost of active filters is high. They are difficult to implement in large scale. Additionally, they also present lower efficiency than shunt passive filters. One of the many solutions is the use of a combined system of shunt and active series filters like Unified Power Quality Conditioner (UPQC) which aims at achieving a low cost under highly effective control. The UPQC device combines a shunt active filter together with a series active filter in a back-to-back configuration, to simultaneously compensate the supply voltage and the load current or to mitigate any type of voltage and current fluctuations and power factor correction in a power distribution network, such that improved power quality can be made available at the point of common coupling. The control strategies are modeled using MATLAB/SIMULINK. The performance is also observed under influence of utility side disturbances such as harmonics and voltage sags. The simulation results are compared without and with UPQC for the verification of results.
The document provides an introduction to power system analysis. It discusses the components of a power system including generators, transformers, transmission lines and loads. It explains that power system analysis involves monitoring the system through load flow analysis, short circuit analysis and stability analysis in order to maintain the system safely and economically. It also discusses the need for power system analysis in planning and operating the system, and ensuring power demand is met through reliable generation and transmission of electricity.
The document discusses using a STATCOM and battery energy storage system to improve power quality from a grid-connected wind energy system. It proposes a control scheme where the STATCOM injects current to cancel out reactive and harmonic parts of current from the induction generator and nonlinear load. It presents the system topology, operation, bang-bang controller for the STATCOM, and simulation results showing the STATCOM reduces total harmonic distortion of source current from 4.06% to 0.40%, improving power quality. The document concludes that the STATCOM-BESS control system eliminates harmonic load current and maintains unity power factor and in-phase voltages and currents at the source.
Statcom control scheme for power quality improvement of grid connected wind e...Kinnera Kin
This project aims to improve power quality for a grid-connected wind energy system using a STATCOM. The objectives are to maintain unity power factor at the source, meet reactive power needs of the wind generator and non-linear load, and provide fast response using hysteresis current control for the STATCOM. MATLAB/Simulink software is used to simulate the system both with and without STATCOM. The simulation results show that with STATCOM, harmonic distortion is eliminated in the load current and power quality is maintained at the point of common coupling.
Unified power quality conditioner for compensating power quality problem adIAEME Publication
This document describes a proposed Adaptive Neuro-Fuzzy Inference System (ANFIS) based Unified Power Quality Conditioner (UPQC) to improve power quality compensation performance. A UPQC uses two voltage source inverters to compensate for both voltage and current disturbances but has high DC link capacitor discharge times. The proposed system adds an ANFIS device to generate a bias voltage that maintains the DC link voltage at a lower level. ANFIS combines neural networks and fuzzy logic to approximate nonlinear functions from numerical and linguistic data. The generated fuzzy rules are trained using a neural network to produce the desired output. Analysis shows the proposed ANFIS-based UPQC provides better power quality compensation than controllers using neural networks,
This document describes a project to improve power quality using a Unified Power Quality Conditioner (UPQC). The UPQC compensates for voltage disturbances and improves current quality using active power filters. It maintains the load voltage despite supply variations. The document outlines the objectives, introduces UPQC components like the shunt and series active power filters, and describes the multivariable controller and Simulink model. The UPQC provides advantages like reduced harmonics, improved waveform quality, and balanced power factor.
Power quality improvement using upqc with soft computing method: Fuzzy logicSakti Prasanna Muduli
Now a days problems regarding power quality is more in large inter connected power systems. There are many method to mitigate these problems but using the latest most efficient compensation method is some what impressive. Here is the brief explanations regarding UPQC using soft computing method(fuzzy logic). This was my academic project along with my friends.
APPLICATION OF STATCOM to IMPROVED DYNAMIC PERFORMANCE OF POWER SYSTEMijsrd.com
Application of FACTS controller called Static Synchronous Compensator STATCOM to improve the performance of power grid with Wind Farms is investigated .The essential feature of the STATCOM is that it has the ability to absorb or inject fastly the reactive power with power grid . Therefore the voltage regulation of the power grid with STATCOM FACTS device is achieved. Moreover restoring the stability of the power system having wind farm after occurring severe disturbance such as faults or wind farm mechanical power variation is obtained with STATCOM controller . The dynamic model of the power system having wind farm controlled by proposed STATCOM is developed . To validate the powerful of the STATCOM FACTS controller, the studied power system is simulated and subjected to different severe disturbances. The results prove the effectiveness of the proposed STATCOM controller in terms of fast damping the power system oscillations and restoring the power system stability.
Improvement of power quality has to be treated as a matter of at most importance in the open
market economy due to the increased use of non linear loads. Several devices have been used to mitigate
the power quality problems. Now a days researchers are concentrating on the use of FACT devices to
overcome power quality issues. Unified Power Quality Conditioner is one among such FACT devices upon
which this paper has concentrated for mitigating the Power Quality problems. Here a 3 phase 3 wire
UPQC is realised using MATLAB/SIMULINK to mitigate voltage sag and swell as well as to maintain
sinusoidal voltage and current at PCC irrespective of load dynamics.
A STATCOM (static synchronous compensator) is a shunt compensation device that can regulate voltage by providing or absorbing reactive power. It uses a voltage source converter to generate a voltage in quadrature with the line current to exchange reactive power with the power system independently of the system frequency. STATCOMs have faster response times than traditional compensation devices, allow active power control with storage, and provide compensation without requiring large capacitor banks or reactors. They can help improve voltage stability in power grids by injecting reactive power to maintain voltages.
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.
It mainly explains about generation of electricity using floating hydro turbine using spring suspension system .The main important factor is the turbine generates electricity when the wave enter and leave the coast.In this the design is also explained about each and every part in the following PPT
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help alleviate symptoms of mental illness and boost overall mental well-being.
This document discusses the maritime boundary of Bangladesh, including its prospects and challenges. It provides background on Bangladesh's maritime boundaries with India and Myanmar, which were disputed but then settled through agreements and international tribunals. The prospects of Bangladesh's maritime boundaries include economic opportunities in fisheries, shipping, tourism, oil and gas extraction, and marine biotechnology. However, there are also challenges such as ensuring sovereignty over the coastal area, maintaining security and infrastructure, sustainable management of resources, and addressing issues like pollution and climate change impacts. Overall, establishing clear maritime boundaries is important for Bangladesh's security and economic development, but proper utilization and management of the resources will also be needed.
The document discusses transformer cooling basics and types of cooling systems. It provides details on different cooling methods like ONAN, ONAF, OFAF, and OFWF. It explains the pros and cons of each method and factors to consider like maintenance, site constraints, and ensuring cooling systems are properly designed for the application and environment. The key points are that cooling system selection and maintenance is important to optimize performance and lifespan of transformers operating under expected service conditions.
SPACE VECTOR MODULATION BASED INDUCTION MOTOR DRIVEpreeti naga
This paper describes an analysis of local PV-wind hybrid systems for supplying electricity to a private house, farmhouse or a small company with electrical power depending on the need at the site. The major system components, work principle and specific working condition are presented in this paper
This document discusses Flexible AC Transmission Systems (FACTS) which use power electronics to control power flows and quantities in power systems. It describes the benefits of FACTS such as increasing transmission capacity and providing direct power flow control. Several types of FACTS controllers are explained including static var compensators (SVCs), thyristor controlled series compensators (TCSCs), and unified power flow controllers (UPFCs). Examples are given of SVCs being used for voltage stabilization and regulation. The conclusion states that FACTS devices can provide solutions to challenges faced by transmission system operators in India and deliver benefits when controlled in a coordinated hierarchical manner within a highly meshed network.
This document discusses different cooling systems for transformers. It begins by introducing transformers and the need for cooling to prevent overheating. It then describes various cooling methods including air cooling, oil cooling, and nitrogen cooling. For oil cooling it explains natural, forced air, forced water, and combinations of forced methods. It concludes by discussing advantages of different cooling systems and their applications, and provides an overview of transformer protection devices.
P.Sravyapresented a technical seminar on Li-Fi (Light Fidelity) at Teegella Krishna Reddy Engineering College. Li-Fi is a technology that uses light from LED bulbs to transmit data wirelessly. It was developed in the 1990s by Harald Haas as a solution for congested radio spectrum. Li-Fi works by varying the intensity of LED lights faster than the human eye can detect to transmit digital ones and zeros. It provides higher speeds than Wi-Fi and has applications in traffic lights, hospitals, airplanes, and underwater. Challenges include light not passing through objects and requiring line of sight.
This document provides a summary of key aspects of transformer basics:
- It describes the working principle of transformers using Faraday's law of electromagnetic induction and discusses the main parts of a transformer including its magnetic core and windings.
- It lists different types of transformers classified by their use, construction, cooling method and other factors. Common types include distribution, power, control, and instrument transformers.
- Key aspects of distribution transformers like primary and secondary voltages, capacities, construction types and impedance ranges are outlined.
- Star and delta connections are explained along with diagrams and equations relating line and phase voltages. Advantages and disadvantages are also summarized.
- Other transformer components like tap changers, bushings
Methods of cooling of electrical machinesAAAbinash
This document discusses various methods of cooling electrical machines. Cooling is needed to dissipate heat from losses during energy conversion and prevent temperatures from exceeding safe levels. Common coolants include water, ethylene glycol and specialized liquids. Heat exchangers transfer heat between primary and secondary coolants. Ventilation methods depend on machine size and include radial, axial and combined ducts. Larger machines often use water or hydrogen as direct coolants. Proper cooling increases efficiency, power output and lifespan of electrical machines.
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.
Power quality issues can cause equipment failures and financial losses for businesses. Common power quality disturbances include transients, sags, swells, and harmonics. Proper power quality monitoring using portable or permanently installed devices can help identify issues, their causes, and reduce downtime.
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 provides an overview of ultrasonic motors. It discusses how ultrasonic motors work on the principle of inverse piezoelectric effect to directly convert electrical energy to mechanical energy. The motor consists of an actuator made of piezoelectric material, a stationary stator, a rotating rotor, and an outer casing. When voltage is applied to the actuator, it causes the stator to vibrate ultrasonically. Frictional contact between the vibrating stator and rotor causes the rotor to rotate, providing useful mechanical output. Ultrasonic motors offer advantages over traditional electromagnetic motors such as higher torque, smaller size, and greater potential for miniaturization.
This document discusses distributed generation, which refers to small-scale power generation located near the end users. It can include sources like solar panels, wind turbines, fuel cells, and cogeneration. Distributed generation has advantages like reduced transmission losses and improved supply security. However, it also presents challenges like impacts on power quality from issues such as voltage regulation, grounding, harmonics, and islanding effects. The document outlines different distributed generation technologies and concludes that its integration into the power system is possible if interconnection designs adequately address power quality and safety considerations.
This document discusses distributed generation (DG), also known as on-site power generation located near the load. DG provides benefits to end-users, distribution utilities, and power producers. It examines various DG technologies like reciprocating engines, combustion turbines, fuel cells, and renewables. The document also covers interface options with the utility grid, power quality issues, operating conflicts, and the role of DG in smart grids and rural electrification as supported by India's government policies.
Power Quality Issues _Literature SurveyKetan Bhavsar
This document summarizes a literature review on power quality issues in industries. It was prepared by five students under the guidance of Prof. N.R. Bhasme. The document defines power quality and discusses various power quality problems such as disturbances, imbalance, distortion, fluctuations and flicker. It describes these problems in detail and lists their possible causes. It also discusses who is affected by power quality issues and how. The document covers monitoring of power quality parameters and the benefits of monitoring. It concludes by emphasizing that power quality issues can result in significant financial losses for businesses.
Comparison of Three leg and Four Leg VSC DSTATCOM for Power Quality AssessmentIOSR Journals
This document compares the performance of three-leg and four-leg voltage source converter (VSC) based distribution static compensators (DSTATCOMs) for power quality improvement in three-phase four-wire distribution systems. It describes the control algorithms and modeling of both the three-leg VSC with a star/delta transformer and the four-leg VSC DSTATCOM topologies. Simulations of both systems are performed in MATLAB/Simulink under different load conditions to regulate voltage and correct power factor. The results demonstrate that the three-leg VSC with a star/delta transformer can compensate reactive power and mitigate neutral currents effectively at a lower cost compared to the four-leg VSC DSTATCOM topology.
The document summarizes a research paper that proposes a new topology for a DSTATCOM (Distribution Static Compensator) to improve power quality in three-phase four-wire distribution systems. The proposed topology integrates a three-leg voltage source converter with a T-connected transformer. This helps mitigate neutral current and allows the DSTATCOM to compensate for load harmonics, reactive power, and imbalance. The design and control strategy of the DSTATCOM are described. Its performance is validated using MATLAB simulation for applications like power factor correction and voltage regulation along with neutral current compensation and harmonic reduction with nonlinear loads.
Power Factor Improvement in Distribution System using DSTATCOM Based on Unit ...RSIS International
Power factor plays important role in the function of
the power system network. Hence, the power factor
improvement will increase the performance of power system
equipments. This paper presents the design and implementation
of distribution static compensator (DSTATCOM) with the stardelta
transformer for improvement of the power factor in threephase
four wire distribution system in the presence of threephase
linear load in the events of single phase, two-phase and
three phase trippings. The unit vector template method based
control algorithm has been implemented for the control of the
proposed DSTATCOM. The proposed test model has been
simulated in SIMULINK/MATLAB environment. The
simulations results show the effectiveness of proposed algorithm
Voltage Sag Mitigation in Utility Connected System Using Current Source Conve...IDES Editor
This paper discusses the implementation of current
source converter based distribution type static synchronous
compensator. For eliminating the lower order harmonics, the
power semiconductors are switched by pulse width modulation
technique. Current source converter, input filter, dc link
reactor are combined to design the proposed CSC based
STATCOM. Since the STATCOM is a current injection
device, the performance of the device is improved by a currentsource
converter (CSC) combination. So a controllable current
is generated at the output terminals of the device. Filter circuit
at the input terminal is designed to eliminate the higher order
harmonics. The proposed D- STATCOM is simulated and the
results are validated using MATLAB.
An Experimental Study of the Unbalance Compensation by Voltage Source Inverte...IJPEDS-IAES
This work presents an experimental study of the unbalance compensation
caused by the high speed railway substations in the high-voltage power grid
with a shunt voltage source inverter based STATCOM. This experimental
study is realized on a reduced scale prototype. The Control of inverter is
implemented in a DSP card. The practical results presented in this paper are
shown the performance of unbalance compensation by VSI_STATCOM in
static and dynamic regime.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Analysis of direct power control AC-DC converter under unbalance voltage supp...IJECEIAES
This paper presents an analysis of Direct Power Control (DPC) technique for the Three-Phase Pulse Width Modulation (PWM) AC-DC converter under unbalanced supply condition. Unbalance condition will cause the presence of unbalanced current and voltages thus produce the negative components on the grid voltage as well as severe performance degradation of a grid connected Voltage Source Inverter (VSI). The input structures for conventional DPC has been modified with a three simpler sequence networks instead of coupled by a detailed Three-Phase system method. The imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called Sequence Network. Consequently, the input power relatively improved during unbalanced condition almost 70% through the measurement of Total Harmonic Distortion (THD) from the conventional Direct Power Control (DPC) in individual elements which is higher compared to separate components. Hence, several analyses are performed in order to analyze the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations.
This paper proposed a new sparce matrix converter with Z-source network to provide unity voltage transfer ratio. It is an ac-to-ac converter with diode-IGBT bidirectional switches. The limitations of existing matrix converter like higher current THD and less voltage transfer ratio issues are overcome by this proposed matrix converter by inserting a Z-source. Due to this Z-source current harmonics are totally removed. The simulation is performed for different frequencies. The simulation results are presented to verify the THD and voltage transfer ratio and compared with the existing virtual AC/DC/AC matrix converter. The experimental output voltage amplitude can be varied with the variable frequencies.
Power Quality Improvement Using Cascaded H-Bridge Multilevel Inverter Based D...IJERA Editor
Cascaded multilevel configuration of the inverter has the advantage of its simplicity and modularity over the
configurations of the diode-clamped and flying capacitor multilevel inverters. This paper presents a threephase,
five-level and seven level cascaded multilevel voltage source inverter based active filter for power line
conditioning to improve power quality in the distribution network. The DSTATCOM helps to improve the
power factor and eliminate the Total Harmonics Distortion (THD) drawn from a Non-Liner Diode Rectifier
Load (NLDRL). The compensation process is based on concept of p-q theory. A CHB Inverter is considered for
shunt compensation of a 11 kV distribution system. Finally a level shifted PWM (LSPWM) and phase shifted
PWM (PSPWM) techniques are adopted to investigate the performance of CHB Inverter. The results are
obtained through Matlab/Simulink software package.
Current Compensation with Reduced Rating VSC and A ZIG –ZAG Transformer an A ...IJERA Editor
A reduced rating voltage-source converter with a zig-zag transformer as a distribution static compensator is proposed for power-quality improvement in the three-phase four-wire distribution system. The source voltages in the distribution systems are also experiencing power quality problems, such as harmonics, unbalance, flicker, sag, swell, etc. The distribution static compensator (DSTATCOM) is proposed for compensating power quality problems in the current, and the dynamic voltage restorer (DVR) is used for mitigating the power quality problems in the voltage. The zig-zag transformer is used for the neutral current compensation. Distribution systems are facing severe power-quality (PQ) problems, such as poor voltage regulation, high reactive power and harmonics current burden, load unbalancing, excessive neutral current, etc. The zig-zag transformer is used for providing a path to the zero-sequence current. The DSTATCOM is used to improve the quality of power to the non linear loads. By using both zig-zag transformer and DSTATCOM in the distribution system the rating of the voltage source converter can be reduced. Hence it can be also called reduced rating device. The performance of the DSTATCOM is validated through extensive simulations using MATLAB software with its Simulink and power system block set toolboxes.
Simulation of D-STATCOM to study Voltage Stability in Distribution systemijsrd.com
This document presents a simulation study of a D-STATCOM (Distribution Static Compensator) to improve voltage stability in a distribution system. It first provides background on voltage dips and describes the structure of a STATCOM, which includes a voltage source inverter, transformer, and controller. The simulation model of the D-STATCOM and distribution network is developed using SimPowerSystems blocks. Simulation results show that without the D-STATCOM, voltage dips to 0.93 p.u. during a load change, but with the D-STATCOM the voltage is stabilized at 1.0 p.u., demonstrating its effectiveness in mitigating power quality issues like voltage instability.
Distribution Static Synchronous Compensator (DSTATCOM) is a shunt compensating device which is used
to improve current profile by exchanging of reactive power with unbalanced and nonlinear load. DSTATCOM is a
shunt compensating device used for power quality improvement in distribution systems. Relevant solutions are
applied for harmonics, fluctuation of voltage, voltage deviation, unbalance of three phase voltage and current and
frequency deviation. Different controlling schemes such as Phase Control Method (PCM), Fryze Power Theory
(FPT), Synchronous Reference Frame Theory (SRFT) and Instantaneous Reactive Power Theory (IRPT) are used
for reactive power compensation with the help of Voltage source Inverter (VSI). In this project we are going to
balance the source current using different control schemes. The results of different source currents are compared
with a different control schemes in terms of active and reactive power and in terms of Total Harmonic Distortion
(THD) for nonlinear load using Fryze Power Theory (FPT) and Instantaneous Reactive Power Theory (IRPT).
Reference currents are generated by the different control schemes have been dynamically traced in a hysteresis
current controller. The performance of DSTATCOM for different control schemes is validated for load balancing
and harmonic elimination by using simulation models in MATLAB/SIMULINK
Indraneel perfect paper on dstatcom using pq theoryindranilsaaki
This document summarizes a research paper about modeling and simulation of a three phase-four wire distribution static compensator (DSTATCOM) system using an H-bridge voltage source inverter (VSI) topology. The DSTATCOM is used to compensate unbalanced and nonlinear loads by injecting current. Maintaining the DC link voltage is important for proper operation but conventional PI controllers have slow transient response. The paper proposes a faster acting DC link voltage controller based on the energy of the DC link capacitor. It also provides equations to design gains for a conventional PI controller to achieve similar fast transient response. Detailed simulation studies are presented to validate the proposed controller.
Comparative analysis of a cascaded seven level and five level mli based distr...IAEME Publication
This document summarizes a research paper that compares a cascaded seven-level and five-level multilevel inverter-based distribution static synchronous compensator (DSTATCOM) for compensating harmonics and reactive power using reference frame theory. The paper presents the configuration of a DSTATCOM using a cascaded multilevel inverter with five levels and seven levels. It describes the operation and switching states of the five-level and seven-level inverters. It also discusses the reference current control strategy used, which generates the reference currents required to compensate load current harmonics and reactive power based on instantaneous real-power theory. The control scheme aims to maintain the DC bus voltage constant. The proposed DSTATCOM system is
Multi Pulse Rectifier Using Different Phase Shifting Transformers and its THD...IRJET Journal
This document discusses multi-pulse rectifiers and their use in reducing harmonics compared to a standard six-pulse rectifier. It describes how multi-pulse rectifiers use different transformer configurations like star-delta, delta-star, and zig-zag connections to provide phase shifting and produce more than six pulses of DC voltage per cycle. This reduces the total harmonic distortion in the input current. The document analyzes rectifiers with 6, 12, 18, 24 and 36 pulses and their relative THD levels. Higher pulse rectifiers provide better power quality but require more complex transformer designs.
The document discusses power system modeling and analysis techniques. It covers topics like single line diagrams, commonly used component symbols, impedance diagrams, per-unit quantities, and their advantages. It also includes two practice problems on drawing impedance diagrams and converting impedances to per-unit values using different bases.
Design of Three-Phase Three-Switch Buck-Type Rectifier for Pre-Charging Appli...IAES-IJPEDS
The main objective of a pre-charging circuit in variable frequency drives is to
pre-charge the DC-bus capacitor without any voltage and current overshoot
within the specified time. In exisiting variable frequency drives seperte precharging
circuits (or) thyristor bridges were used due to this drives power
density, cost becomes high and control technique becomes complex. This
paper presents about the design of three-phase three-switch buck-type
rectifier for pre-charging application used in variable frequency drives which
elimates the disadvantages of existing techniques. In this paper we will
discuss about design procedure of pre-charging circuit of an 800KW
converter with dc-link output voltage of 775V at an input ac voltage of 550V,
60Hz, selection of power and passive components, voltage and current stress
of power transistors. In the final this paper discusses about loss distribution
of the components and comparison of new converter technique with existing
pre-charging techniques.
This document summarizes a research paper that proposes and evaluates a novel interleaved ZCS boost DC-DC converter topology for photovoltaic interfaces. The converter uses two quasi-resonant switch blocks and lossless snubbers to achieve soft switching. Simulation results show the converter achieves reduced voltage and current ripple compared to conventional designs. A dual loop control scheme with an outer voltage loop and inner current loop is used to regulate the output. Coupling inductors between converter cells further improve transient response and reduce ripple. The proposed converter design and control scheme effectively interfaces photovoltaic systems with loads.
This paper presents an analysis of virtual-flux direct power control (VFDPC) technique for the three-phase pulse width modulation (PWM) ac-dc converter. The proposed VFDPC is developed by assuming the grid voltage and converter line filters quantities are related to a virtual three-phase ac motor. The controller works with less number of sensors by eliminating the voltage sensors used for measuring the three-phase grid voltage. The grid virtual flux which is proportional to the grid voltage will be estimated from the information of converter switching states, line current, and dc-link output voltage. Several analyses are performed in order to study the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations. The proportional integral (PI) controller at the outer voltage control loop of VFDPC is tuned properly and the entire PWM ac-dc converter system is simulated using MATLAB/Simulink to ensure the dc output voltage follow the desired output voltage under steady state and dynamic conditions. Ac-dc converter utilizing the proposed VFDPC is able to generate three-phase input current waveforms that are almost sinusoidal with low harmonics contents which is less than 5% and near unity power factor (pf) operation.
This document describes a proposed unified power quality conditioner (UPQC) topology that can compensate for voltage sags, swells and current harmonics with a reduced DC-link voltage without compromising performance. The UPQC uses a capacitor in series with the interfacing inductor of the shunt active filter and connects the system neutral to the negative DC-link terminal. This allows the DC-link voltage requirements of the series and shunt active filters to be matched with a common DC-link capacitor. The performance of the proposed topology is evaluated through MATLAB/Simulink simulation.
Impartiality as per ISO /IEC 17025:2017 StandardMuhammadJazib15
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This presentation is about Food Delivery Systems and how they are developed using the Software Development Life Cycle (SDLC) and other methods. It explains the steps involved in creating a food delivery app, from planning and designing to testing and launching. The slide also covers different tools and technologies used to make these systems work efficiently.
This study Examines the Effectiveness of Talent Procurement through the Imple...DharmaBanothu
In the world with high technology and fast
forward mindset recruiters are walking/showing interest
towards E-Recruitment. Present most of the HRs of
many companies are choosing E-Recruitment as the best
choice for recruitment. E-Recruitment is being done
through many online platforms like Linkedin, Naukri,
Instagram , Facebook etc. Now with high technology E-
Recruitment has gone through next level by using
Artificial Intelligence too.
Key Words : Talent Management, Talent Acquisition , E-
Recruitment , Artificial Intelligence Introduction
Effectiveness of Talent Acquisition through E-
Recruitment in this topic we will discuss about 4important
and interlinked topics which are
We have designed & manufacture the Lubi Valves LBF series type of Butterfly Valves for General Utility Water applications as well as for HVAC applications.
Prediction of Electrical Energy Efficiency Using Information on Consumer's Ac...PriyankaKilaniya
Energy efficiency has been important since the latter part of the last century. The main object of this survey is to determine the energy efficiency knowledge among consumers. Two separate districts in Bangladesh are selected to conduct the survey on households and showrooms about the energy and seller also. The survey uses the data to find some regression equations from which it is easy to predict energy efficiency knowledge. The data is analyzed and calculated based on five important criteria. The initial target was to find some factors that help predict a person's energy efficiency knowledge. From the survey, it is found that the energy efficiency awareness among the people of our country is very low. Relationships between household energy use behaviors are estimated using a unique dataset of about 40 households and 20 showrooms in Bangladesh's Chapainawabganj and Bagerhat districts. Knowledge of energy consumption and energy efficiency technology options is found to be associated with household use of energy conservation practices. Household characteristics also influence household energy use behavior. Younger household cohorts are more likely to adopt energy-efficient technologies and energy conservation practices and place primary importance on energy saving for environmental reasons. Education also influences attitudes toward energy conservation in Bangladesh. Low-education households indicate they primarily save electricity for the environment while high-education households indicate they are motivated by environmental concerns.
Null Bangalore | Pentesters Approach to AWS IAMDivyanshu
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
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Applications of artificial Intelligence in Mechanical Engineering.pdfAtif Razi
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
1. Comparison Of Star/Delta and Zig-zag/Star
Transformer Based DSTATCOM For
Power Quality Improvement
Guided BY- Submitted By-
Monika Jain Anurag Jain
Asst. Professor (0105EE13MT02)
EX Department, OIST Bhopal
2. Content
• Introduction
• Literature Review
• Single line diagram of Proposed system for Star/Delta transformer
• Control algorithm
• MATLAB model
• Simulink Results
• Single line diagram of Proposed system for Zig/Zag transformer
• Simulink Results
• Comparison
• Conclusion
• Appendix
• Paper Published
• References
3. Introduction
There are many factors both internal and external that affect the quality and quantity
of power that is being delivered. In present day power distribution systems are
facing severe Power Quality problems, such as poor voltage regulation, high
reactive power, harmonics, excessive neutral current, etc.
The Custom Power Devices(CPDs) are used to resolve these problems.
4. Power Quality
“Continuity” of supply and the “Quality” of voltage.
Power Quality is the interaction of electrical power with electrical equipment.
If electrical equipment operates correctly and reliably without being damaged or
stressed, we would say that the electrical power is of good quality.
On the other hand, if the electrical equipment malfunctions, is unreliable, or is
damaged during normal usage, we would suspect that the power quality is poor.
8. Custom Power Devices
To improve the reliability and power quality in a distribution, a group of devices,
called Custom Power Devices (CPD) are in use now days.
DSTATCOM
DVR
UPQC
9. DSTATCOM
• It is a shunt connected CPD based on a power electronics Voltage Source Converter
• The distribution static compensator (DSTATCOM) is used for compensating PQ
problems in the current.
10. VSC
• A voltage-source converter is a power electronic device, which can generate a
sinusoidal voltage with any required magnitude, frequency and phase angle.
• The VSC is used to either completely replace the voltage or to inject the
“missing voltage‟. The “missing voltage” is the difference between the
nominal voltage and the actual.
11. Literature Review
• Bhim Singh, et.al. [2008] A new topology of three-phase four-wire DSTATCOM
consisting of a H-bridge VSC (voltage source converter) with a star/delta
transformer is proposed for power quality improvement in the distribution
systems.
• T R Somayajulu, et.al. [2008] In this paper, a new topology of DSTATCOM
(Distribution Static Compensator) is proposed for power quality improvement in a
three-phase four-wire distribution system. A three-leg VSC (Voltage Source
Converter) based DSTATCOM is integrated with a zig-zag transformer
12. • D.P. Kothari et.al. [2008] In this paper, a new three-phase four-wire distribution
static compensator (DSTATCOM) based on a T-connected transformer and a
three-leg voltage source converter (VSC) is proposed for power quality
improvement.
• P Jayaprakash, et.al. [2012] In this paper, a new topology of DSTATCOM using
three single-phase VSCs (voltage source converters) integrated with a zig-zag
transformer is employed for the power quality improvement in three-phase four-
wire distribution systems. The zig-zag transformer is used to providing a path to
the zero sequence fundamental as well as harmonics currents.
13. • Bhim singh et.al [2008] A new topology of DSTATCOM (distribution static
compensator) consisting of a H-bridge VSC (voltage source converter) and a
star/delta transformer is proposed for power quality improvement in the three-
phase four wire distribution system.
• P. Jayaprakash et.al [2008] A detailed investigation is made into the causes,
standards, and remedies of the excessive neutral current. A reduced rating voltage-
source converter with a zig-zag transformer as a distribution static compensator is
proposed for power quality improvement in the three-phase four wire distribution
system.
14. • Bhattacharya Sourabh, [2012] D-STATCOM (distribution static compensator) is a
shunt device which is generally used to solve power quality problems in
distribution systems. D-STATCOM is a shunt device used in correcting power
factor, maintaining constant distribution voltage and mitigating harmonics in a
distribution network.
• D.P. Kothari, et.al. [2009] A three-phase four-wire DSTATCOM (distribution
static compensator) based on three-leg VSC (voltage source converter) isolated
with a star/hexagon transformer is demonstrated for power quality enhancement in
a three-phase four-wire distribution system.
16. Design of Star/Delta Transformer
The kVA rating of the transformer is given as
kVASD = 0.5ΣVrmsIrms
kVASD = 0.5(ΣVYrmsIYrms +ΣV∆rmsI∆rms)
For the integrated DSTATCOM configuration using a Star/Delta transformer, the
rating is obtained as,
Rms value is given as
√3VLIL= (kW*1000/CosФ)
kVASD = 0.5[{3*(INm/3)*(VL/√3)+3*(INm/3)*(VL/√3)}]
The rating of transformer 3.4 kVA and ratio 240/140 V are selected for the operation
19. Design of DSTATCOM
DC Bus Voltage: The dc bus voltage is defined as,
Vdc = 2√2 VLL/(√3m)
Where m is the modulation index and is considered as 1. Thus, one may obtain the
value of Vdc as 677 V for VLL of 415 V. Thus, Vdc of the value of 680 V is selected.
DC Bus Capacitor: Dc capacitor is governed by the reduction in the dc bus voltage
1
2
Cdc[(V2dc) −(V2dc1)] = 3V(aI)t
where a is the over loading factor, and t is the response time of the DSTATCOM and t
is considered as 350µs .
20. Considering Vdc= 680 V, Vdc1= 670 V, V=415/3, a=1.2 , the calculated value of Cdc
is 2600 µf. So Cdc is chosen to be 3200 µf.
AC Inductor: The selection of the ac inductance depends on the current ripple
icr,p-p. The ac inductance is given as,
Lf = [(√3mVdc) /(12afs icr(p-p))
The value of AC Inductance is defined 5mH.
Ripple Filter: A high pass first-order filter tuned at half the switching frequency is
used to filter out the noise from the voltage at the PCC. The time constant of the
filter should be very small compared to the fundamental time period (T).
Rf Cf << T/10
22. Control Strategy
A. Active Component of Reference Source Currents
• Three-phase voltages at the PCC are considered sinusoidal and hence their
amplitude is computed as,
Vt = {(2/3) (vSa
2 +vSb
2 +vSc
2)} 1/2 (1)
• The unit vector in phase with vsa, vsb and vsc are derived as,
ua = vSa/Vt; ub = vSb/Vt; uc = vSc/Vt (2)
• The error in dc bus voltage of VSC (Vdcer (n)) of an DSTATCOM at nth sampling
instant is as,
Vdcer(n) = Vdcref(n) – Vdc(n) (3)
23. • The output of the PI controller for maintaining dc bus voltage of the VSC at the
nth sampling instant is expressed as,
iloss(n) = iloss(n-1) + Kpd { Vdcer(n) – Vdcer(n-1)} + KidVdcer(n) (4)
• In-phase components of reference source currents are estimated as:
isad* = ua iloss ; isbd* = ub iloss ; iscd* = uc iloss (5)
B. Quadrature Component of Reference Source Currents
• The unit vectors (wa, wb and wc) in quadrature with vsa, vsb and vsc may be derived
using a quadrature transformation of the in-phase unit vectors ua, ub and uc as,
24. wa = -ub / √3 + uc / √3 (6)
wb = √3 ua / 2 + (ub – uc) / 2√3 (7)
wc= -√3 ua / 2 + (ub – uc) / 2√3 (8)
• The error in PCC voltage of VSC (Vser (n)) of an DSTATCOM at nth sampling
instant is as,
Vter(n) = Vtref(n) – Vt(n) (9)
• The output of the PI controller for maintaining amplitude of PCC voltage at the
nth sampling instant is expressed as,
iqr(n) = iqr(n-1) + Kpq { Vter(n) – Vter(n-1)} + KiqVter(n) (10)
25. • The quadrature components of reference source currents are estimated as:
isaq* = waiqr ; isbq* = wbiqr ; iscq* = wciqr (11)
• Total reference source currents are sum of in-phase and quadrature components of
the reference source currents as,
isa* = isad* +isaq* (12)
isb* = isbd* +isbq* (13)
isc* = iscd* +iscq* (14)
These reference source currents (isa*, isb* and isc*) are compared with the sensed
source currents (isa, isb and isc) in PWM current controller of VSC of DSTATCOM.
These current errors controlled using a current controlled PWM to generate gating
pulse of the switches.
38. Design of Zig/Zag Transformer
Considering a turn ratio of 1:1:1 and voltage across each winding VX volts and
line voltage is VL then,
VX = (VL / √3)
Similar to Star/Delta transformer, kVA rating of Zig/Zag transformer is given as
kVAZZ = 0.5 {ƩVzrmsIzrms)
For the integrated DSTATCOM configuration using a zig-zag / star transformer,
the rating is obtained as,
(kVA)ZZ/S = 0.5[{6*(IL)*(VL/3)} + {3*(IL)*(VL/3)}]
(kVA)ZZ/S = 0.5[{6*(15)*(140)} + {3*(15)*(140)}]
The transformer of rating 3kVA and ratio 140/140/140 V are selected.
47. Comparison
S.No. Parameter DSTATCOM Zig/Zag Star/Delta
1. kVA 12 3 3.4
2. Input Voltage 415 v, 50Hz 140 v 240 v
3. DC Voltage 700 340 340
4. DC Bus
Capacitance
4000 µf 3200 µf 3200 µf
5. Transformer
Required
- 140v/140v/140v 240v/140v
6. VSC 4 leg 3 leg 3 leg
7. No. of switches 8 6 6
48. Conclusion
• The performance of system consisting DSTATCOM with Star/Delta and Zig/Zag
transformer has been demonstrated for Harmonic elimination, neutral current
compensation, and power factor correction for three-phase balanced system.
• The Proposed systems has been reduced the rating of VSC and found effective for
compensating to solve power quality issues.
• The rating of Zig/Zag transformer is lesser than the rating of Star/Delta
transformer.
49. Appendices
• AC line voltage: 415 V, 50 Hz
• Line Impedance: Rs=0.01ohm, Ls=1mH
• Load: Non-linear: Three single phase bridge rectifier with an R-L-C load with, R
= 25ohm and C = 100μF and L = 8mH
DSTATCOM Parameters:
• VSC: Six IGBTs connected as three-leg VSC
50. For Star/Delta transformer
• DC bus voltage: 340V
• DC bus capacitance: C= 3200μF.
• AC Inductance: Lf= 5 mH
• Three numbers of single-phase transformers of rating 3.4kVA with 240V/140V
for the system.
For Zig/Zag transformer
• DC bus voltage: 340V
• DC bus capacitance: C= 3200μF.
• AC Inductance: Lf= 5 mH
• Three numbers of single-phase transformers of 3kVA with 140 V/140 V/140V.
51. Paper Published
• Anurag Jain and Monika Jain “Comparison of Star/Delta and Zig/Zag Transformer Based
DSTATCOM for Power Quality Improvement” 3rd IEEE International Student’s
Conference on Electrical, Electronics and Computer Science 5-6 march 2016, accepted
(SCEECS-2016), Maulana Azad National Institute of Technology (MANIT) Bhopal, India.
• Anurag Jain and Monika Jain “Isolated operation of Star/Delta and Zig/Zag transformer
Based DSTATCOM for Power Quality Improvement” National conference of Recent
Advancement in Futuristic Technologies 17-18 October 2015.
• Anurag Jain and Monika Jain “Comparative Analysis of Star/Delta and Zig/Zag
Transformer Based DSTATCOM for Power Quality improvement “International Journal of
Innovative Trends in Engineering (IJITE), ISSN: 2395-2946 IJITE_12_01403 Volume 12
No-1 December 2015.
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