This presentation on Power Quality Improvement Techniques: A Review presented by Sahid Raja Khan student of B. Tech. Electrical Engineering of Compucom Institute of Technology and Management Jaipur. It describes the improvement technique of Power Quality at GSS and other Substations including Generating Stations.
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.
The document discusses power quality issues caused by harmonics from non-linear loads. It provides background on the increasing use of non-linear loads and effects of harmonics. Specific sources of harmonics are outlined along with their impact on power quality including overheating, failures, and interference. Mitigation techniques are reviewed such as passive and active filtering. Active power filters are highlighted as an effective solution, with shunt active power filters discussed in detail for compensating harmonic currents and reactive power. The document concludes that active power filtering is still developing and more research is needed on techniques like controls and artificial intelligence to further improve power quality.
##CONTENT##
Introduction
Voltage control
Power system control
Control of reactive power and power factor
Interconnected control and frequency ties
Supervisory control
Line compensation
Series compensation
Series and shunt compensation schemes for ac transmission system
This document discusses voltage and reactive power control methods in power systems. It covers the need for reactive power to maintain voltage levels and deliver active power through transmission lines. Various reactive power compensation devices are described such as series and shunt capacitors/reactors, synchronous condensers, static VAR compensators, and static synchronous compensators. Common voltage and reactive power control methods include excitation control at generating stations, using tap changing transformers, and switching shunt reactors/capacitors depending on load levels.
The document discusses emerging facts about STATCOM (Static Synchronous Compensator) controllers. It describes that a STATCOM is a voltage source converter that produces synchronized AC output voltages using a DC voltage input to compensate for reactive power. It can improve dynamic voltage control, power oscillation damping, transient stability, voltage flicker control, and control of both reactive and active power. The STATCOM structure uses encapsulated electronic converters in a small footprint to minimize environmental impact. It can independently generate or absorb reactive power depending on the magnitude of its output voltage compared to the line voltage.
The document discusses multi-terminal DC (MTDC) systems. MTDC systems are used when there are multiple terminals in an HVDC transmission system. There are two main types of MTDC configurations: series and parallel. Series MTDC connects terminals in series, while parallel MTDC allows terminals to adjust currents independently and keep voltages constant. Radial and mesh are examples of parallel MTDC network topologies. MTDC systems provide benefits over multiple two-terminal HVDC links such as reduced costs and losses as well as increased transmission capacity and flexibility.
Reactive power management and voltage control by using statcomHussain Ali
This document summarizes the use of STATCOM devices for reactive power management and voltage control in transmission lines. It defines reactive power and explains the need for reactive power compensation. It then defines FACTS devices and specifically STATCOMs, describing their basic structure and principle of operation for generating and absorbing reactive power. The document discusses how STATCOMs can provide benefits like reactive power control, voltage regulation, and increased transmission capacity. It provides an example of a 500 MVAR STATCOM installed between Qatar and Bahrain for reactive power compensation and concludes that STATCOMs allow tighter voltage control and improved reliability compared to traditional capacitor banks.
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.
The document discusses power quality issues caused by harmonics from non-linear loads. It provides background on the increasing use of non-linear loads and effects of harmonics. Specific sources of harmonics are outlined along with their impact on power quality including overheating, failures, and interference. Mitigation techniques are reviewed such as passive and active filtering. Active power filters are highlighted as an effective solution, with shunt active power filters discussed in detail for compensating harmonic currents and reactive power. The document concludes that active power filtering is still developing and more research is needed on techniques like controls and artificial intelligence to further improve power quality.
##CONTENT##
Introduction
Voltage control
Power system control
Control of reactive power and power factor
Interconnected control and frequency ties
Supervisory control
Line compensation
Series compensation
Series and shunt compensation schemes for ac transmission system
This document discusses voltage and reactive power control methods in power systems. It covers the need for reactive power to maintain voltage levels and deliver active power through transmission lines. Various reactive power compensation devices are described such as series and shunt capacitors/reactors, synchronous condensers, static VAR compensators, and static synchronous compensators. Common voltage and reactive power control methods include excitation control at generating stations, using tap changing transformers, and switching shunt reactors/capacitors depending on load levels.
The document discusses emerging facts about STATCOM (Static Synchronous Compensator) controllers. It describes that a STATCOM is a voltage source converter that produces synchronized AC output voltages using a DC voltage input to compensate for reactive power. It can improve dynamic voltage control, power oscillation damping, transient stability, voltage flicker control, and control of both reactive and active power. The STATCOM structure uses encapsulated electronic converters in a small footprint to minimize environmental impact. It can independently generate or absorb reactive power depending on the magnitude of its output voltage compared to the line voltage.
The document discusses multi-terminal DC (MTDC) systems. MTDC systems are used when there are multiple terminals in an HVDC transmission system. There are two main types of MTDC configurations: series and parallel. Series MTDC connects terminals in series, while parallel MTDC allows terminals to adjust currents independently and keep voltages constant. Radial and mesh are examples of parallel MTDC network topologies. MTDC systems provide benefits over multiple two-terminal HVDC links such as reduced costs and losses as well as increased transmission capacity and flexibility.
Reactive power management and voltage control by using statcomHussain Ali
This document summarizes the use of STATCOM devices for reactive power management and voltage control in transmission lines. It defines reactive power and explains the need for reactive power compensation. It then defines FACTS devices and specifically STATCOMs, describing their basic structure and principle of operation for generating and absorbing reactive power. The document discusses how STATCOMs can provide benefits like reactive power control, voltage regulation, and increased transmission capacity. It provides an example of a 500 MVAR STATCOM installed between Qatar and Bahrain for reactive power compensation and concludes that STATCOMs allow tighter voltage control and improved reliability compared to traditional capacitor banks.
seminar report on power quality monitoring khemraj298
The document discusses power quality monitoring and its importance for sustainable energy systems like solar power in India. It provides context on increased sensitivity of modern equipment to power quality issues and defines different types of steady state variations and events that impact power quality. Monitoring objectives include proactive and reactive approaches to characterize system performance and identify specific problems. The development of an intelligent power quality monitoring system using LabVIEW and sensors is described to efficiently monitor power quality in sustainable energy systems.
Voltage source Converters as a building block of HVDC and FACTSKarthik Bharadwaj
This document discusses voltage source converters (VSCs) and their use in HVDC and FACTS systems. It provides background on VSCs and how they allow independent control of real and reactive power. The first HVDC transmission using VSC converters took place in 1997 in Sweden. VSCs generate AC voltage from DC and can control output voltage magnitude, phase, and frequency. When used for HVDC, multiple VSCs can be connected in series to reduce harmonics. FACTS devices using VSCs, such as STATCOMs, can control power flow and provide voltage regulation on transmission lines.
This document discusses power quality monitoring. It defines power quality as the properties of the power supply delivered to users. Power quality can be affected by various steady state variations and events that cause deviations from the ideal voltage waveform. The document describes different types of power quality disturbances and how automatic classifiers are used to classify disturbances. It discusses power quality monitoring objectives and the types of commercially available power quality monitors used to identify and analyze power quality problems.
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.
The document discusses planning for HVDC transmission and modern trends in HVDC technology. When planning HVDC transmission, the key factors to consider are cost, technical performance, and reliability. Modern trends aim to reduce converter station costs while improving reliability and performance. This includes advances in power semiconductors, converter control technology, development of DC breakers, conversion of existing AC lines, and operation with weak AC systems. Emerging technologies discussed are active DC filters, capacitor commutated converters, and ultra-high voltage DC transmission.
This document discusses Flexible AC Transmission Systems (FACTS) controllers. It defines FACTS controllers as power electronic devices that control parameters of AC transmission systems. The document describes several types of FACTS controllers including STATCOM, SVC, TCSC, SSSC, and UPFC. It explains how each type of controller works and its benefits such as increasing power transfer capability and network reliability.
This document discusses issues related to connecting renewable energy sources to the electric grid. It notes that renewable resources like wind and solar are intermittent and lack flexibility, posing challenges to balancing supply and demand. Various technical issues are explored, such as voltage fluctuations, frequency variation, power quality issues like harmonics. Solutions discussed include using inverters with voltage regulation modes, frequency ride-through systems, and distributing generation sources across three phases. The document advocates for grid-tied renewable systems and the development of new technologies to better integrate intermittent renewables at high penetration levels.
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
Power System Transient - Introduction.pptxssuser6453eb
This document provides an introduction to power system transients. It discusses the sources of transients, both internal like capacitor switching and external like lightning. It classifies transients into three categories based on speed: ultrafast surges, medium-fast short-circuit phenomena, and slow transient stability issues. The effects of transients are outlined, such as damage to insulation, semiconductors, and contacts. The importance of studying transients for insulation design is emphasized to prevent breakdown under overvoltage conditions.
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.
POWER QUALITY ISSUES (POWER SYSTEM AND POWER ELECTRONICS)Rohit vijay
This document discusses power quality issues, specifically voltage sags. It defines voltage sags as decreases in voltage between 10-90% of nominal voltage lasting from half a cycle to one minute. Common causes of voltage sags include motor starting, faults in the power system, and sudden increases in load. The document discusses various methods for mitigating voltage sags, including power conditioning equipment like static VAR compensators, UPS systems, and custom devices like dynamic voltage regulators and D-STATCOMs. It also describes using an auto-transformer controlled by an IGBT switch as a method for mitigating voltage sags.
The document discusses harmonics in power systems. Harmonics are caused by non-linear loads that draw current in pulses rather than smoothly. Common sources are electronic devices, variable speed drives, and UPS systems. Harmonics can overheat equipment, increase power costs, and distort voltages and currents. They are managed by measuring harmonic levels and installing filters if problems are detected.
This document discusses different types of firing angle control schemes for HVDC converters, including individual phase control (IPC) and equidistant phase control (EPC). IPC allows independent control of each phase's firing angle based on commutation voltages. EPC generates firing angles at equal intervals through a ring counter. Higher-level controllers are also discussed that can control DC power modulation for frequency regulation, emergency control, reactive power control, and damping of sub-synchronous oscillations. Voltage source converter control is mentioned, where the modulation index and phase angle are used to regulate active and reactive power flow.
This presentation provides an overview of power quality, including definitions of power quality, common power quality disturbances like sags, swells, harmonics and interruptions. It discusses the increased sensitivity of modern electronic equipment to power quality issues. Real-time power quality monitoring systems are described that can identify issues, locate their sources, and help utilities and customers mitigate problems to reduce costs and equipment damage. The benefits of power quality monitoring include improved reliability, preventative maintenance, and identification of sensitive equipment needing protection.
The electricity supply industry is undergoing a profound transformation worldwide. Market forces, scarcer natural resources, and an ever-increasing demand for electricity are some of the drivers responsible for such unprecedented change. Against this background of rapid evolution, the expansion programs of many utilities are being thwarted by a variety of well-founded, environment, land-use, and regulatory pressures that prevent the licensing and building of new transmission lines and electricity generating plants.
This document provides a summary of a project presentation on improving power quality in a distribution system using a Dynamic Voltage Restorer (DVR). The presentation was given by 5 students and covered the background, problem statement, objectives, methodology, and work schedule of the project. The document discusses various power quality issues like voltage sags, swells, harmonics, and transients. It describes how a DVR works to inject voltage and regulate the load voltage during disturbances. The methodology section explains the basic components and operating mode of a DVR. The work schedule outlines a 16 week plan for the project simulation, testing, and reporting.
Iaetsd minimization of voltage sags and swells using dvrIaetsd Iaetsd
The document discusses the use of a Dynamic Voltage Restorer (DVR) to minimize voltage sags and swells in a distributed power system. A DVR is a custom power device that uses a voltage source inverter, injection transformer, and energy storage to inject voltage into the distribution system and regulate the load voltage during faults and disturbances. It functions by injecting a compensating series voltage to keep the load voltage at its pre-fault value. This maintains the quality of power supplied to sensitive loads and prevents equipment issues caused by voltage variations.
seminar report on power quality monitoring khemraj298
The document discusses power quality monitoring and its importance for sustainable energy systems like solar power in India. It provides context on increased sensitivity of modern equipment to power quality issues and defines different types of steady state variations and events that impact power quality. Monitoring objectives include proactive and reactive approaches to characterize system performance and identify specific problems. The development of an intelligent power quality monitoring system using LabVIEW and sensors is described to efficiently monitor power quality in sustainable energy systems.
Voltage source Converters as a building block of HVDC and FACTSKarthik Bharadwaj
This document discusses voltage source converters (VSCs) and their use in HVDC and FACTS systems. It provides background on VSCs and how they allow independent control of real and reactive power. The first HVDC transmission using VSC converters took place in 1997 in Sweden. VSCs generate AC voltage from DC and can control output voltage magnitude, phase, and frequency. When used for HVDC, multiple VSCs can be connected in series to reduce harmonics. FACTS devices using VSCs, such as STATCOMs, can control power flow and provide voltage regulation on transmission lines.
This document discusses power quality monitoring. It defines power quality as the properties of the power supply delivered to users. Power quality can be affected by various steady state variations and events that cause deviations from the ideal voltage waveform. The document describes different types of power quality disturbances and how automatic classifiers are used to classify disturbances. It discusses power quality monitoring objectives and the types of commercially available power quality monitors used to identify and analyze power quality problems.
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.
The document discusses planning for HVDC transmission and modern trends in HVDC technology. When planning HVDC transmission, the key factors to consider are cost, technical performance, and reliability. Modern trends aim to reduce converter station costs while improving reliability and performance. This includes advances in power semiconductors, converter control technology, development of DC breakers, conversion of existing AC lines, and operation with weak AC systems. Emerging technologies discussed are active DC filters, capacitor commutated converters, and ultra-high voltage DC transmission.
This document discusses Flexible AC Transmission Systems (FACTS) controllers. It defines FACTS controllers as power electronic devices that control parameters of AC transmission systems. The document describes several types of FACTS controllers including STATCOM, SVC, TCSC, SSSC, and UPFC. It explains how each type of controller works and its benefits such as increasing power transfer capability and network reliability.
This document discusses issues related to connecting renewable energy sources to the electric grid. It notes that renewable resources like wind and solar are intermittent and lack flexibility, posing challenges to balancing supply and demand. Various technical issues are explored, such as voltage fluctuations, frequency variation, power quality issues like harmonics. Solutions discussed include using inverters with voltage regulation modes, frequency ride-through systems, and distributing generation sources across three phases. The document advocates for grid-tied renewable systems and the development of new technologies to better integrate intermittent renewables at high penetration levels.
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
Power System Transient - Introduction.pptxssuser6453eb
This document provides an introduction to power system transients. It discusses the sources of transients, both internal like capacitor switching and external like lightning. It classifies transients into three categories based on speed: ultrafast surges, medium-fast short-circuit phenomena, and slow transient stability issues. The effects of transients are outlined, such as damage to insulation, semiconductors, and contacts. The importance of studying transients for insulation design is emphasized to prevent breakdown under overvoltage conditions.
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.
POWER QUALITY ISSUES (POWER SYSTEM AND POWER ELECTRONICS)Rohit vijay
This document discusses power quality issues, specifically voltage sags. It defines voltage sags as decreases in voltage between 10-90% of nominal voltage lasting from half a cycle to one minute. Common causes of voltage sags include motor starting, faults in the power system, and sudden increases in load. The document discusses various methods for mitigating voltage sags, including power conditioning equipment like static VAR compensators, UPS systems, and custom devices like dynamic voltage regulators and D-STATCOMs. It also describes using an auto-transformer controlled by an IGBT switch as a method for mitigating voltage sags.
The document discusses harmonics in power systems. Harmonics are caused by non-linear loads that draw current in pulses rather than smoothly. Common sources are electronic devices, variable speed drives, and UPS systems. Harmonics can overheat equipment, increase power costs, and distort voltages and currents. They are managed by measuring harmonic levels and installing filters if problems are detected.
This document discusses different types of firing angle control schemes for HVDC converters, including individual phase control (IPC) and equidistant phase control (EPC). IPC allows independent control of each phase's firing angle based on commutation voltages. EPC generates firing angles at equal intervals through a ring counter. Higher-level controllers are also discussed that can control DC power modulation for frequency regulation, emergency control, reactive power control, and damping of sub-synchronous oscillations. Voltage source converter control is mentioned, where the modulation index and phase angle are used to regulate active and reactive power flow.
This presentation provides an overview of power quality, including definitions of power quality, common power quality disturbances like sags, swells, harmonics and interruptions. It discusses the increased sensitivity of modern electronic equipment to power quality issues. Real-time power quality monitoring systems are described that can identify issues, locate their sources, and help utilities and customers mitigate problems to reduce costs and equipment damage. The benefits of power quality monitoring include improved reliability, preventative maintenance, and identification of sensitive equipment needing protection.
The electricity supply industry is undergoing a profound transformation worldwide. Market forces, scarcer natural resources, and an ever-increasing demand for electricity are some of the drivers responsible for such unprecedented change. Against this background of rapid evolution, the expansion programs of many utilities are being thwarted by a variety of well-founded, environment, land-use, and regulatory pressures that prevent the licensing and building of new transmission lines and electricity generating plants.
This document provides a summary of a project presentation on improving power quality in a distribution system using a Dynamic Voltage Restorer (DVR). The presentation was given by 5 students and covered the background, problem statement, objectives, methodology, and work schedule of the project. The document discusses various power quality issues like voltage sags, swells, harmonics, and transients. It describes how a DVR works to inject voltage and regulate the load voltage during disturbances. The methodology section explains the basic components and operating mode of a DVR. The work schedule outlines a 16 week plan for the project simulation, testing, and reporting.
Iaetsd minimization of voltage sags and swells using dvrIaetsd Iaetsd
The document discusses the use of a Dynamic Voltage Restorer (DVR) to minimize voltage sags and swells in a distributed power system. A DVR is a custom power device that uses a voltage source inverter, injection transformer, and energy storage to inject voltage into the distribution system and regulate the load voltage during faults and disturbances. It functions by injecting a compensating series voltage to keep the load voltage at its pre-fault value. This maintains the quality of power supplied to sensitive loads and prevents equipment issues caused by voltage variations.
1. The document describes a simulation of a Dynamic Voltage Restorer (DVR) for mitigating voltage sags in a distribution system. A DVR injects voltage in series with the distribution feeder using a voltage source inverter, injection transformer, and energy storage device.
2. The performance of three control techniques for the DVR's inverter - PI controller, hysteresis current control, and hysteresis voltage control - were compared through MATLAB simulation. Hysteresis voltage control was able to fully compensate a three-phase fault that caused a 17% voltage sag.
3. By injecting the appropriate compensating voltage, a DVR can restore the load voltage to its rated value during faults or disturbances
Modeling and simulation of dynamic voltage restorer for voltage sag mitigatio...IJRRR
Abstract- Power quality deals with utilization of electric energy from the distribution system successfully without interference or interruption. Various factors like interruption in power supply, under voltage, over voltage, unbalanced voltage or current, harmonic distortion, flickering voltage, voltage fluctuation voltage sag etc. result in poor power quality. These power quality related problems can be solved with the help of various custom power devices. Voltage sags are considered to be the most common type of disturbances in the field based on current power disturbances studies. Their impact on sensitive loads is rigorous. The impact ranges from load disruptions to financial losses. In spite of the technical advances in electronics, there are some pieces of equipment that are so sensitive that they are unable to withstand voltage sags. There are many varies methods to mitigate voltage sags, but a Custom Power Supply device is considered to be the most efficient method. This dissertation is the study of Dynamic Voltage Restorer (DVR) which is the most efficient and effective device to protect sensitive equipment against voltage sags. It has low cost, smaller size and it has dynamic response to the disturbance.
Keywords- Voltage sag, DVR, power system, mitigation
Sag mitigation in distribution system by using Dynamic voltage Restorer (DVR)IJERA Editor
Power quality is most important concern in the current age. It’s now a day’s necessary with the refined devices, where performance is very perceptive to the quality of power supply. Power quality crisis is an incidence manifest as a typical voltage, current or frequency that results in a failure of end use equipments. One of the major crises dealt here is the power sag. Perceptive industrial loads and distribution networks suffer from different types of service interruptions and outages which results in a major financial loss. To improve the power quality, custom power-devices are used. The device considered in this work is Dynamic Voltage Restorer. This paper shows modelling, analysis and simulation of a DVR test systems using MATLAB.
I have considered single line to ground fault for linear load. The role of DVR is to “compensate load voltage” is examined during the different fault conditions like voltage sag, single phase to ground faults.
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.
1) The document discusses various power quality problems faced in power systems such as voltage sags, interruptions, flicker, surges, spikes, and harmonics.
2) It describes different types of active power filters that can be used to solve power quality issues, including shunt active filters that inject compensating current, and series active filters that inject compensating voltage.
3) The unified power quality conditioner is introduced, which uses both series and shunt active filters to improve both voltage and current quality by controlling series injected voltage and shunt injected current.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
A High-Performance SPWM Controller for Three-Phase UPS Systems Operating Unde...ijiert bestjournal
The increased use of rectifiers in critical loads employed by the information technologies,and medical and military equipment mandate the design of uninterruptible power supplies (UPS) with high- quality outputs. The highly nonlinear currents drawn especially by high-power single-phase rectifier loads greatly distort the uninterruptible power supplies (UPS) outputs. The distorted uninterruptible power supplies (UPS) voltages cause generation of low dc voltage at the output of the rectifier loads,which causes high current flow,increased power losses,and possibly the malfunction of the critical load or the uninterruptible power supplies (UPS). As a result,different harmonics mitigating techniques have gained a lot of attention. The main objective of this project is to develop simulation of a high-performance Pulse Width Modulation (PWM) technique based AC-DC converter system operating under highly nonlinear loads using MATLAB/SIMULINK. Here,controlled Insulated-gate bipolar transistor (IGBT) based AC-DC converter is used to supply the load instead of Diode or Thyristor Bridge. The pulse width modulation method is quite effective in controlling the root mean square (RMS) magnitude of the AC-DC converter output voltages and shape of input current. This enables automatic harmonic compensation by Rectifier itself.
This document discusses power quality issues in electricity distribution systems and solutions using power electronics. It defines power quality as dealing with voltage magnitude disturbances and waveform distortions. Common power quality issues include transients, voltage variations, waveform distortions, and frequency variations. International standards like IEEE 519-1992 establish limits for harmonic distortions. Power electronic solutions for improving power quality include shunt controllers like static VAR compensators (D-SVC) and distribution static synchronous compensators (D-STATCOM), and series controllers like dynamic voltage restorers. D-SVC and D-STATCOM are discussed in further detail regarding their operation and advantages.
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.
power quality improvement of power system network using UPFCBikash Gyawali
This document presents a project on improving power quality in a power system network using a Unified Power Flow Controller (UPFC). It defines power quality and discusses causes of poor power quality such as non-linear loads and switching operations. It then introduces Flexible AC Transmission Systems (FACTS) devices as a way to improve power quality and lists benefits such as increasing power transfer capability and improving transient stability. Specifically, it describes a UPFC, which combines a static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC) to independently control real and reactive power flow. The UPFC configuration and components are shown, and it is explained how the UPFC can improve power quality by regulating voltage, impedance
Performance of DVR under various Fault conditions in Electrical Distribution ...IOSR Journals
1) The document describes the performance of a Dynamic Voltage Restorer (DVR) under various fault conditions in an electrical distribution system.
2) A DVR is connected in series with the distribution network to inject voltage and compensate for voltage sags and swells, maintaining the load voltage at its nominal value.
3) Simulation results using MATLAB/Simulink show that the DVR is able to effectively compensate for voltage disturbances caused by single line-to-ground faults, double line-to-ground faults, line-to-line faults, and three-phase faults, keeping the load voltage stable at its desired level.
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.
POWER QUALITY PROBLEMS & SOLUTIONS- POWER SYSTEMAnandYadav207
It's an Electrical core topic on which you can deliver your presentation with respect to your industrial certification program.
you can use Course era online courses platform as like me for this type of certification. it's really beneficial for you guys
Thanks//.
This document discusses power quality issues related to distribution systems. It covers various power quality problems including voltage sags/interruptions, transients, flicker, and harmonic distortion. For each problem, it describes characteristics, potential causes, and impacts on equipment. It also outlines processes for evaluating power quality problems which include measurement/data collection, identifying the range of solutions, and evaluating solutions to determine the optimum for resolving issues. The document provides detailed explanations, diagrams and examples related to harmonics, transients, and their impacts on system components like transformers and AC motors.
This document summarizes a research paper that models the performance of different types of Dynamic Voltage Restorers (DVRs) in mitigating balanced and unbalanced voltage sags on distribution systems. The paper presents modeling aspects of several DVR configurations and analyzes their effectiveness in compensating for various voltage sag scenarios through detailed simulation results. It also discusses the capability of DVRs to regulate voltage quality at load terminals during power quality issues like sags, swells and harmonics.
A Review on Basic Concepts and Important Standards of Power Quality in Power ...Editor IJCATR
This paper deals with the basic of Power quality in power system. In addition basic definition and important concepts was
discussed in simple way. This paper also covers the important power quality standards. In addition IEEE, IEC, SEMI and UIE Power
quality standards are listed. This paper would be helpful for the UG and PG students to study about the basics of Power quality in
electrical engineering.
Similar to Power quality improvement techniques (20)
We have designed & manufacture the Lubi Valves LBF series type of Butterfly Valves for General Utility Water applications as well as for HVAC applications.
Covid Management System Project Report.pdfKamal Acharya
CoVID-19 sprang up in Wuhan China in November 2019 and was declared a pandemic by the in January 2020 World Health Organization (WHO). Like the Spanish flu of 1918 that claimed millions of lives, the COVID-19 has caused the demise of thousands with China, Italy, Spain, USA and India having the highest statistics on infection and mortality rates. Regardless of existing sophisticated technologies and medical science, the spread has continued to surge high. With this COVID-19 Management System, organizations can respond virtually to the COVID-19 pandemic and protect, educate and care for citizens in the community in a quick and effective manner. This comprehensive solution not only helps in containing the virus but also proactively empowers both citizens and care providers to minimize the spread of the virus through targeted strategies and education.
2. INDEX
DEFINATION
DIFFERENT POWER QUALITY PROBLEM
CONSEQUENCESOF POOR POWER
QUALITY
SOLUTION OF POWER QUALITY
PROBLEMS
CONCLUSION
3. DEFINATION
Power quality is often defined as the electrical network
grid’s ability to power supply clean and stable power
supply.
In other words power quality ideally creates a perfect
power supply that is always available has a pure, noise-
free sinusoidal waves shape, and is always within voltage
and frequency tolerances.
4. DIFFERENT POWER QUALITY PROBLEM
Due to increasing and varying energy demands from
various industrial processes, many loads regularly impose
disturbances on the grid, making deviation from these
ideal condition are frequent.
There are main causes of PQ problem given below
1. Harmonic distortion
2. Voltage unbalance
3. Short voltage variation
4. Long voltage variation
5. 1.Harmonic distortion:
The total harmonic distortion, or THD, of a signal is a
measurement of the harmonic distortion present and is
defined as the ratio of the sum of the powers of all harmonic
components to the power of the fundamental frequency.
Causes:
Harmonics are caused by non-linear loads that draw a non
sinusoidal current from a sinusoidal voltage source.
Some examples of harmonic producing loads are electric arc
furnaces, staticVAR compensators, inverters, DC converters,
switch-mode power supplies, and AC or DC motor drives.
6.
7. 2.Voltage unbalance
It is defined as the difference between the highest and the
lowest RMS voltage, referred to the average of the three
voltage.
In other words the maximum deviation from the average
phase voltage, referred to the average of the phase voltage
8.
9. Causes:
Any large single phase load, or a number of small loads connected
to only one phase cause more current to flow from that particular
phase causing voltage drop on line.
Switching of three phase heavy loads results in current and voltage
surges which cause unbalance in the system.
10. 3.Short DurationVoltageVariation:
Short duration voltage variations are caused by fault
condition, the energization of large loads which require high
starting current or intermitted loose connection.
11. 4.Long DurationVoltageVariation:
Long duration variation can be either overvoltage or under
voltages. Overvoltage and under voltages generally are not
the result of system fault but are caused by the load variation
on the system and system switching operations.
There are two types of long duration voltage variation
1. Over voltage
2. Under voltage
12. Consequense of Poor Power
Quality
Reduction production speed
Increased energy consumption
Charges for reactive power consumption
Lost production
Equipment damage
Data loss
Decreased equipment lifetime
13. Solutions of Power Quality
Problems
Using DVR
Using UPQC
Using STATCOM
DVR:
DynamicVoltage Restorer can provide the
most cost effective solution to mitigate
voltage sags and swells that is required by
customer.
14. The Dynamic Voltage Restorer (DVR) is a rapid,
Flexible and resourceful solution to power
quality problems.
15. DVR consists of
1. Energy Storage Unit
2. Capacitor
3. Inverter
4. Passive Filters
5. By-Pass Switch
6. Voltage InjectionTransformers
DVR operating states:
• During a voltage sag or swell on the line
• During the normal operation
• During a short circuit or fault in the downstream of the
distribution line
16. UPQC:
• The UPQC which is an integration of shunt and series
APF is one of the most appropriate as well as
effective device in this concern.
17. UPQC consists of
1. Shunt Inverter
2. Series Inverter
3. LC Filter
4. Series InjectionTransformer
18. STATCOM:
• STATCOM is a shunt compensator based on usually multi-
level VSC design, utilizing IGBT (Insulated Gate Bipolar
Transistor) as reliable high speed switching elements and
a control concept based on pulse-width modulation.
• STATCOM allows voltage stabilization, improvement of
power factor and dynamic control at the point of
connection to industrial load using reactive power
compensation.
19.
20. CONCLUSION
Electrical Power system of India Is not too much efficient
thus many improvements are to made for improve of the
power quality of electrical power.
Power quality factor is affected by many reason some of
these reasons are harmonics, voltage sag, voltage swell,
voltage interruption, voltage unbalance etc. These factor
can be overcome using UPQC, STATCOM, DVR etc.
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