The document discusses synchronous generator excitation systems. It describes how excitation current determines the strength of the magnetic field and induces voltage at the generator terminals. It also explains that voltage regulators increase excitation current to maintain constant voltage as load increases. The main types of excitation systems are DC, AC, and static systems. Digital excitation systems offer advantages like easier processing and high reliability. Components of excitation systems include the exciter, regulator, voltage transducer, power system stabilizer, and protective circuits.
Functions and Performance Requirements
Elements of an Excitation System
Types of Excitation Systems
Control and Protection Functions
Modeling of Excitation Systems
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
Functions and Performance Requirements
Elements of an Excitation System
Types of Excitation Systems
Control and Protection Functions
Modeling of Excitation Systems
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
The significance of power factor correction (PFC) has long been visualized as a technology requirement for improving the efficiency of a power system network by compensating for the fundamental reactive power generated or consumed by simple inductive or capacitive loads. With the Information Age in full swing, the growth of high reliability, low cost electronic products have led utilities to escalate their power quality concerns created by the increase of such “switching loads.” These products include: entertainment devices such as Digital TVs, DVDs, and audio equipment; information technology devices such as PCs, printers, and fax-machines; variable speed motor drives for HVAC and white goods appliances; food preparation and cooking products such as microwaves and cook tops; and lighting products, which include electronic ballasts, LED and fluorescent lamps, and other power conversion devices that operate a variety of lamps. The drivers that have resulted in this proliferation are a direct result of the availability of low-cost switch-mode devices and control circuitry in all major end-use segments: residential, commercial, and industrial.
Load Frequency Control of Two Area SystemManash Deka
This is a synopsis presentation on a project of designing and analyzing Load Frequency Control (LFC) of a two area system. This is useful for students, basically of Electrical Engineering branch. This project will be simulated in simulink of MATLAB.
Physical Description
Mathematical Model
Park's "dqo" transportation
Steady-state Analysis
phasor representation in d-q coordinates
link with network equations
Definition of "rotor angle"
Representation of Synchronous Machines in Stability Studies
neglect of stator transients
magnetic saturation
Simplified Models
Synchronous Machine Parameters
Reactive Capability Limits
Consists of two sets of windings:
3 phase armature winding on the stator distributed with centres 120° apart in space
field winding on the rotor supplied by DC
Two basic rotor structures used:
salient or projecting pole structure for hydraulic units (low speed)
round rotor structure for thermal units (high speed)
Salient poles have concentrated field windings; usually also carry damper windings on the pole face.Round rotors have solid steel rotors with distributed windings
Nearly sinusoidal space distribution of flux wave shape obtained by:
distributing stator windings and field windings in many slots (round rotor);
shaping pole faces (salient pole)
Load / Frequency balancing Control systems studyCAL
In this project, the load and frequency control problem on the power generator at 'Britannia sugar factory' is investigated under different governor action. The existing system employs a Mechanical-hydraulic governor. It is desired to improve the system's response to load disturbances on the interconnected power grid.
Wide area monitoring systems (WAMS) are essentially based on the new data acquisition technology of phasor measurement and allow monitoring transmission system conditions over large areas in view of detecting and further counteracting grid instabilities.
The significance of power factor correction (PFC) has long been visualized as a technology requirement for improving the efficiency of a power system network by compensating for the fundamental reactive power generated or consumed by simple inductive or capacitive loads. With the Information Age in full swing, the growth of high reliability, low cost electronic products have led utilities to escalate their power quality concerns created by the increase of such “switching loads.” These products include: entertainment devices such as Digital TVs, DVDs, and audio equipment; information technology devices such as PCs, printers, and fax-machines; variable speed motor drives for HVAC and white goods appliances; food preparation and cooking products such as microwaves and cook tops; and lighting products, which include electronic ballasts, LED and fluorescent lamps, and other power conversion devices that operate a variety of lamps. The drivers that have resulted in this proliferation are a direct result of the availability of low-cost switch-mode devices and control circuitry in all major end-use segments: residential, commercial, and industrial.
Load Frequency Control of Two Area SystemManash Deka
This is a synopsis presentation on a project of designing and analyzing Load Frequency Control (LFC) of a two area system. This is useful for students, basically of Electrical Engineering branch. This project will be simulated in simulink of MATLAB.
Physical Description
Mathematical Model
Park's "dqo" transportation
Steady-state Analysis
phasor representation in d-q coordinates
link with network equations
Definition of "rotor angle"
Representation of Synchronous Machines in Stability Studies
neglect of stator transients
magnetic saturation
Simplified Models
Synchronous Machine Parameters
Reactive Capability Limits
Consists of two sets of windings:
3 phase armature winding on the stator distributed with centres 120° apart in space
field winding on the rotor supplied by DC
Two basic rotor structures used:
salient or projecting pole structure for hydraulic units (low speed)
round rotor structure for thermal units (high speed)
Salient poles have concentrated field windings; usually also carry damper windings on the pole face.Round rotors have solid steel rotors with distributed windings
Nearly sinusoidal space distribution of flux wave shape obtained by:
distributing stator windings and field windings in many slots (round rotor);
shaping pole faces (salient pole)
Load / Frequency balancing Control systems studyCAL
In this project, the load and frequency control problem on the power generator at 'Britannia sugar factory' is investigated under different governor action. The existing system employs a Mechanical-hydraulic governor. It is desired to improve the system's response to load disturbances on the interconnected power grid.
Wide area monitoring systems (WAMS) are essentially based on the new data acquisition technology of phasor measurement and allow monitoring transmission system conditions over large areas in view of detecting and further counteracting grid instabilities.
Modelling the system dynamics of islanding asynchronous generators / Telemark...Modelon
Study of Håkon Molland Edvardsen & Dietmar Winkler from Telemark University College
Norway (Modelica Conference 2014).
Modelon's Electric Power Library helps in the model-based reconstruction of events behind an earth circuit fault in Grunnåi, Norway.
Excitation System & capability curve of synchronous generatorMANOJ KUMAR MAHARANA
Excitation systems perform control and protective functions essential to the satisfactory performance of the power system.
The amount of continuous reactive power a generator can supply is restricted by various limits. In the over-excitation region limits are imposed by rotor heating or amount of field current and second is the stator current. In the under excitation region the limits are imposed by load angle. So in steady state the generator should always operate within this region and the loci of the various limiters are called the capability curve of the generator.
This paper presents a novel control strategy for the compensation of voltage quality issues in power system networks with AC drives. Voltage quality is one of the key parameter for power engineers and to deliver the power with good quality should be given at most priority. Voltage quality mitigation in power system network is done by employing dynamic voltage restorer (DVR). DVR consists of power switches and power switches are to be controlled. DVR in this paper is controlled using a novel control strategy. A novel control strategy can effectively control DVR by improving voltage quality reducing the adverse effects of voltage sag and voltage swell in power system networks. The paper presents the DVR controlled with novel control strategy for electrical machine (induction motor) drive load application.
Adaptive Neuro Fuzzy Controller Based Power System Stabilizer for Damping of ...IJMTST Journal
Maximum power transfer and optimal power flow is desired which is affected by the inter area oscillation
of low frequency .To avoid low frequency inter area power oscillations power system stabilizer is added to
the automatic voltage regulators on the generators. Stabilizer provides the means to damp these low
frequency power oscillations .Different types of stabilizers are available to damp power oscillations still a
power system stabilizers can be developed to effectively damp low frequency power oscillations. Without
increasing the system complexity these oscillations can be reduced with the help of developing power system
stabilizer to damp the low frequency inter area power oscillations.
Adaptive Neuro Fuzzy Interface system (ANFIS) is designed to achieve fast and effective power oscillation
damping in two area four machine power system. This work is implemented with MATLAB simulink 2012(b).
Also comparative analysis of low frequency power oscillation damping of ANFIS controller based stabilizer
and conventional PID power system stabilizer is presented in this paper. Comparison of results show that
low frequency inter area power oscillation damping of ANFIS controller based stabilizer is much higher than
PID power system stabilizer. Also damping time provided by ANFIS controller based power system stabilizer
is 75% less in comparison to PID power system stabilizer .
DC MOTOR SPEED CONTROL USING ON-OFF CONTROLLER BY PIC16F877A MICROCONTROLLERTridib Bose
This presentation consists the speed control of a dc motor using hardware (microcontroller) by changing the reference voltages logically and minimising errors.
Unit-V
Measurement and Solving of Power Quality Problems: Power quality measurement devices- Harmonic Analyzer , Transient Disturbance Analyzer, wiring and grounding tester, Flicker Meter, Oscilloscope, multi-meter etc. Introduction to Custom Power Devices-Network Reconfiguration devices; Load compensation and voltage regulation using DSTATCOM; protecting sensitive loads using DVR; Unified power Quality Conditioner. (UPQC)
AMTECH is the leading Manufacturer and Supplier of Active Harmonic Filters based in Gujarat, India. We provide advanced technology power quality solutions to avoid their ill-effects on capacitors, transformers, cables, and switchgears.
Get In Touch
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CONTACT INFO
Address: E-6, GIDC Electronics Zone, Gandhinagar - 382 028, Gujarat , India.
Phone: +91-79-23289101, 23289102, 23289103
E-mail: info@amtechelectronics.com
This paper represents the topology and hardware design of Embedded-Z (EZ) source feed induction motor. Conventionally there are two converters used for ASD systems i.e. Voltage Source Inverter (VSI) and Current Source Inverter (CSI), but they have a limited output voltage range. Conventional VSI and CSI support only either buck or boost DC-AC power conversion and need a relatively complex modulator. The problems in traditional source converters can be overcome by Z source inverter. In this LC impedance are employed for fast power conversion. Due to requirement of additional LC filter the cost of operation also increases.
DESIGN OF MPSS AND TCSC DAMPING CONTROLLERS IN MULTI- MACHINE POWER SYSTEM U...Editor IJMTER
The main approach of this paper is to do the small signal analysis in a two area four
machine power system which has coordinated design of both MPSS and TCSC. TCSC controller is
design based on power oscillation damping controller which is used for voltage series compensation
at the voltage sag, voltage swell .Small signal stability analysis is nothing but analysis in power
system for low frequency components in the range of 0.1hz to 2hz.Linear modeling of the power
system is carried out to find out the frequency analysis at the different system components like
transformer, other devices. BFO algorithm is used to minimize an Eigen value based multi-objective
in which it tunes the parameter of the POD controller ,it will be improve the system stability and it
saves the computational cost and in less iterations we can achieve the good optimized POD
parameter values. The time domain simulation in MATLAB/SIMULINK environment carried out on
two area four machine power system over various perturbations shows that superior enhancement in
damping of power system oscillations has been obtained by utilizing proposed PSS-POD coordinated
controllers in comparison with the CPSS-POD.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
2. 1:-Excitation current determines the strength of the magnetic field of the coil
(along with speed of the rotor). This magnetic field then induces voltage at the
generator terminals.
2:-If the generator is not connected to the load , there is no power flow, but
voltage is even established with this magnetic field.
3:-The generator voltage will be strictly a function of rotor speed and excitation
current .
4:- When load is connected, the generator voltage drops, with the increasing
load.
5:-Voltage regulator however will increase excitation current to maintain
constant generator voltage .
Introduction of synchronous generator excitation
2
http://control.com/thread/1360687812
3. FUNCTIONS OF EXCITATION SYSTEMS
Provide direct current to the synchronous generator field winding,
Perform control and protective functions essential to the satisfactory
operation of the power system
The performance requirements of the excitation system areThe performance requirements of the excitation system are
determined bydetermined by
A )Generator considerations:
supply and adjust field current as the generator output varies within its
continuous capability
respond to transient disturbances with field forcing consistent with the
generator short term capabilities
rotor insulation failure due to high field voltage
rotor heating due to high field current
3
Lec-15 Excitation Systems-Part-2 nptel
4. contribute to effective control of system voltage and Flow of
reactive power
Maintain the power systems stability with (PSS)
Elements of an Excitation System
1.Exciter:
2.Regulator
3.Terminal voltage transducer and load compensator::
4.Power system stabilizer::
5.Limiters and protective circuits
4
6. Classified into three broad categories based on the excitation power source:
1.DC excitation systems
2.AC excitation systems
3.Static excitation systems
4.Digital excitation systems
Type of excitation systems
6
Lec-15 Excitation Systems-Part-2 nptel
7. DC excitation system with amplidyne voltage regulators
DC excitation systems
Lec-15 Excitation Systems-Part-2 nptel
7
8. AC Excitation SystemsAC Excitation Systems::
Field controlled alternator rectifier excitation system
8
Lec-15 Excitation Systems-Part-2 nptel
9. AC Excitation SystemsAC Excitation Systems
: Alternator supplied controlled-rectifier excitation system
9
Lec-15 Excitation Systems-Part-2 nptel
10. AC Excitation SystemsAC Excitation Systems
: Brushless excitation system
10
Lec-15 Excitation Systems-Part-2 nptel
14. DIGITAL AVR
The digital AVR is based on the analog AVR’S control functions and makes
use of the advantages of digital equipment such as easier processing
,transmission and recording of information . Its hardware being compact the
digital AVR has high reliability equal to that of the analog AVR.
FUNCTION:
The digital AVR function is same as the analog AVR that is has AVR to
control generator voltage ,UEL(under excitation limit),OEL(over excitation
limit) and PSS. as to the maintenance service functions, the digital AVR has
such function as operation /fault status indication, self diagnostic generation
of generator reference voltage setter step signals for verification of dynamic
characteristics and recording of transient. It is possible to calculate bode
diagram indicate transient responses and calculate rise times by feeding
the recorded transient data to a personal computer via RS232C.
14
15. 0-20A DECS-250N
0-2,500Adc DECS-400
0-10,000Adc DECS-2100
Benefits
The DECS family product line offers many integrated features and
functions for regulation, limiting, protection, and data analysis to
make your product selection easy.
DECS products are available for standard or custom solutions to be
utilized on pan chassis or in cubicles as part of a complete system to
fit in your application.
EXCITATION CURRENT IN SPECIAL DECS MODALS
15
16. BE1-40Q Loss of Excitation Relay
Protection of loss of excitation
These relays provide protection for
synchronous generators from extensive
damage by detecting loss-of-field excitation.
BENEFIT
Accurate protection provided by true var
measurement.
Minimized CT and PT costs as a result of
low sensing burden.
Reduced battery load with low burden
power supply.
Accurate, repeatable, and reliable
operation.
Simple HMI provides clear and intuitive
settings for easy configuration.
LED targets provide clear annunciation
of status.
Easily perform in-case system and www.basler.com/Products/Protective
15
17. Excitation System Application
:
Digital Exciter has Replaced of Brushless Exciter
Digital Exciter has Replaced of Shunt Exciters
Digital Exciters Replacement for ALTERREX
Digital Exciters have very high response that way systems is
more stable
Have very less rotating part for controlling side that way less
rotational loss
16