The document summarizes the analysis of a Graetz circuit, which is used in HVDC transmission, under two scenarios: without overlap and with overlap between thyristor valves. In the without overlap scenario, the analysis assumes valves switch on and off instantaneously with no two valves on at once. This allows simplifying the circuit to determine voltage and current waveforms. When overlap is considered and two valves can be on simultaneously, the analysis is more complex with different operation modes identified depending on the overlap angle. Key aspects of voltage, current, power factor and harmonics are derived.
DSTATCOM IS USED IN DISTRIBUTION SYSTEM TO IMPROVE POWER QUALITY LIKE PF CORRECTION,VOLTAGE SAG OR SWELL,HARMONICS ELEMINATION,ETC.VARIOUS CONTROL STRATEGY COMPARISION FOR DSTATCOM.ADVANTAGES AND DISADVANTAGES OF DSTATCOM.APPLICATION OF STASTCOM IN INDIA.
DSTATCOM IS USED IN DISTRIBUTION SYSTEM TO IMPROVE POWER QUALITY LIKE PF CORRECTION,VOLTAGE SAG OR SWELL,HARMONICS ELEMINATION,ETC.VARIOUS CONTROL STRATEGY COMPARISION FOR DSTATCOM.ADVANTAGES AND DISADVANTAGES OF DSTATCOM.APPLICATION OF STASTCOM IN INDIA.
Generation of High D.C. Voltage (HVDC generation)RP6997
Generation of high dc voltage using different methods like half wave and full wave rectifier, voltage doubler circuits, voltage multiplier circuits, cockcroft-walton circuits and van de graaff generators.
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
Automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary. The balance can be judged by measuring the system frequency; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate. If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
Design factors; Limitations; Modern trends; Electrical
Engineering Materials; Space factor; Choice of Specific
Electric and Magnetic loadings; Thermal Considerations;
Heat flow; Temperature rise; Insulating Materials; Properties;
Rating of Machines; Various Standard Specifications ;
Generation of High D.C. Voltage (HVDC generation)RP6997
Generation of high dc voltage using different methods like half wave and full wave rectifier, voltage doubler circuits, voltage multiplier circuits, cockcroft-walton circuits and van de graaff generators.
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
Automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary. The balance can be judged by measuring the system frequency; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate. If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
Design factors; Limitations; Modern trends; Electrical
Engineering Materials; Space factor; Choice of Specific
Electric and Magnetic loadings; Thermal Considerations;
Heat flow; Temperature rise; Insulating Materials; Properties;
Rating of Machines; Various Standard Specifications ;
This presentation was presented to Dr. Chongru Liu in North China Electric Power University,Beijing,China by Mr. Aazim Rasool. This presentation will help to understand the control of HVDC system. Animations are not working like ppt. so I apologize on this.
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
In this paper, the unbalanced current in the 12- pulse phase control AC/DC converters was studied. The 12- pulse A-Y type AClDC converter will keep a balanced voltage with 30" phase shifted at the low coupling coefficient condition. But an unbalanced current will be obtained in the 12-pulse autotransformer phase shift AClDC converter at the low coupling coefficient condition. The theoretical phasor analysis of the unbalanced current was presented and a feedback controller was designed to overcome this problem. Finally, a 3 kW 12-pulse autotransformer phase shifted AClDC converter was implemented to demonstrate the theoretical analysis.
Some manufacturers claim to have zero current chopping level on their devices and in their
publications remain silent on what these levels are. Joslyn Clark has always published the
current chop level of our vacuum contactor and expressed it as a maximum current chop
as seen 10,000 operational tests. This current level is .9 of an amp and the transient
voltage generated can be calculated by the current chopping value IC times the surge
impedance Z0 of the circuit. Some manufacturers express current chop levels as low
percentages of full load current and as such are acceptable. For example, if you had a
600 amp device, the consider 4 to 5 amps being less than 1% of the devices rating as
being acceptable. This is definitely not true as we believe that current chop levels as high
as 4 to 5 amps are very dangerous to the insulation level of loads such as electric motors
and dry type transformers.
Research Inventy : International Journal of Engineering and Scienceinventy
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.
1.SINGLE PHASE HALF WAVE CONTROLLED CONVERTER WITH RESISTIVEINDUCTIVE LOAD
2 SINGLE PHASE FULLY CONTROLLED CONVERTER WITH RESISTIVEINDUCTIVE LOAD
3 SPEED CONTROL OF 3-PHASE SLIP RING (WOUND ROTOR) INDUCTION MOTOR
4 THYRISTORISED DRIVE FOR DC MOTOR WITH CLOSED LOOP CONTROL
5 THYRISTORISED DRIVE FOR PMDC MOTOR WITH SPEED MEASUREMENT & CLOSED LOOP CONTROL
6 SPEED MEASUREMENT OF PMDC MOTOR WITH CLOSED LOOP CONTROL
7 IGBT USING SINGLE 4 QUADRANT CHOPPER DRIVE FOR PMDC MOTOR WITH SPEED MEASUREMENT AND CLOSED LOOP AND CONTROL
8 SINGLE PHASE CYCLO CONVERTER BASED AC INDUCTION MOTOR CONTROLLER
9 THREE PHASE INPUT THYRISTORISED DRIVE 3HP DC MOTOR WITH CLOSED LOOP CONTROL
10 THREE PHASE INPUT IGBT DRIVE FOR 4 QUADRANT CHOPPER OF 3HP DC MOTOR WITH CLOSED LOOP CONTROL
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
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
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
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2. 3.3.1 Without
Overlap
•At any instant, two valves are conducting in the bridge,
one from the upper and one from the lower
commutation group.
•As the next valve of a commutation group fires, the
preceding valve turns off.
•This assumption, that no overlap between two
valves(meaning no two valves are “on” at the same
instant), is incorrect.
•However, this assumption provides a simpler analysis
into the operation of a converter.
3. 3.3.1 Without
Overlap
•The firing of valves are numbered in sequence, with
60° intervals, and conducts for 120°.
•Consecutive firing pulse is 60° in steady state.
5. 3.3.1 Without
Overlap
To further simplify analysis, the following assumptions
are taken into consideration
1. The DC current is constant
2. The valves can be modelled as ideal switches
with zero impedance when on or conducting,
and infinite impedance when off or not
conducting.
3. The AC voltages at the converter bus are
sinusoidal and remain constant.
6. 3.3.1 Without
Overlap
•A period of an AC voltage supply can be divided into 6
intervals, corresponding to the firing of a pair of valves.
•The DC voltage waveform repeats for each interval,
thus simplifying the calculation of the average DC
voltage, since we only have to consider one interval.
•Assuming the firing of the 3rd valve is delayed by an
angle α (α° after the crossing of the commutation
voltage for valve 3 – voltage eba ) the instantaneous DC
voltage vd during the interval is given by
vd = eb – ec = ebc, α ≤ ωt ≤ α + 60°
8. 3.3.1 Without
Overlap
•Eq. 3.8 that different values of α (range of α is from 0
to 180°), vd is variable. More importantly, when α
crosses 90°, vd is negative value.
•This means that the same converter can act as an
inverter or rectifier depending on the direction of the
DC voltage.
9. 3.3.1 Without
Overlap:
DC Voltage Waveform
•The DC voltage wave contains a ripple whose
fundamental frequency is six times the supply
frequency.
•It contains harmonics of the order h = np, where p is
the pulse number, and n is an integer.
•The rms value of the hth order harmonic is given by:
10. 3.3.1 Without
Overlap:
DC Voltage Waveform
As seen on the figure, 3 voltage
jumps arise due to the
commutation from one valve to
the next. The jumps have the
same magnitude given by eq.
3.10:
11. 3.3.1 Without
Overlap:
DC Voltage Waveform
The full range of 180° cannot be utilized. For all series
thyristors to fire, a minimum limit of alpha is set
greater than zero, likewise, for it to go off, an upper
limit is set less than 180°. Α is not allowed to go beyond
the upper limit (180°-γ), where γ is called the
extinction angle or margin angle. The minimum γ
value is 10°. For normal inverter operation, γ is not
allowed to go below 15° or °.
12. 3.3.1 Without
Overlap:
AC Current Waveform
While it is assumed that dc has no ripple(or harmonics)
due to smoothing reactors in series with the bridge
circuit. The AC currents flowing through the primary
and secondary windings of the transformer has.
Fig. 3.6 shows the current waveform in a valve winding.
13. 3.3.1 Without
Overlap:
AC Current Waveform
• The rms value of the fundamental component of current is
given by:
Where n is an integer, and p is the pulse number.
14. 3.3.1 Without
Overlap:
AC Current Waveform, Power Factor
AC harmonics order(6 pulse bridge converter) : 5, 7, 11,
13 and higher order.
• The first four are filtered out using tuned filters for each.
• The rest requires high pass filters.
The rms value of the hth is given by
The AC power supplied to the converter is
𝐼ℎ =
𝐼𝐼
ℎ
15. 3.3.1 Without
Overlap:
Power Factor
•Ignoring the losses in the converter, the DC power will
be equal to the AC power. Therefore:
Substituting for Vdo and II from eqs. 3.8 and
3.11 gives : cosΦ = cosα
The reactive power requirement increases as α closes
to 90° from 0° or 80°. When α=90°, pf=0 and only
reactive power is consumed.
16. 3.3.2 With Overlap
• Due to the leakage inductance of the converter
transformers and the supply network’s impedance, the
current in the valve will not suddenly change. An
example is when commutation from valve 1 to 3, there
is a finite period of time when both valves are
conducting. That is called overlap and its duration is
measured by u called overlap(commutation) angle.
17. 3.3.2 With Overlap
•The first subinterval shows three valves are conducting and 2nd
subinterval shows 2 valves. This is based on the assumption that the
u<60°. As u goes beyond 60°, there is a finite period where 4 valves are
commutating and 3 valves at the rest of the interval.
• Because of this, there are 3 modes of the converter.
18. 3.3.2 With Overlap
The three modes are:
◦ 1. Mode 1 – two and three valve conduction u<60°
◦ 2. Mode 2 – Three valve conduction u=60°
◦ 3. Mode 3 – Three and four valve conduction u<60°
20. 3.3.2 With Overlap:
Analysis of Mode 1
For that circuit eb – ea = Lc eq. 3.16
The L.H.S is called the commutating emf and its value is:
Which is also the voltage across valve 3 just before it fires.
Since i1 = Id – i3 (eq. 3.18), we get:
𝑑𝑖3
𝑑𝑡
−
𝑑𝑖1
ⅆ𝑡
21. 3.3.2 With Overlap:
Analysis of Mode 1
Where:
The sol’n from 3.20 is from the initial condition i3 (ωt = a) = 0 (eq. 3.22)
At ωt = α + u, i3 = Id,, this gives Id = Is[cos α – cos (α +u)] (eq. 3.23)
Note: during commutation, the
instantaneous dc voltage is:
Instead of (eb – ec)
−
3
2
𝑒 𝑐
23. 3.3.2 With Overlap:
Analysis of Mode 1 : Average Direct
Voltage
Where Rc is called equivalent commutation resistance. This is
similar to armature reaction in DC machines as it only
represents voltage drop and not a power loss.
24. 3.3.2 With Overlap:
Analysis of Mode 1 : DC voltage and Valve voltage
waveforms
Notice the valve voltage has now 8 jumps. The two major
jumps occur at the firing and turning off and is given by:
25. 3.3.2 With Overlap:
Analysis of Mode 1 : DC voltage and Valve voltage
waveforms
•The remaining 6 jumps are divided to 2 groups, the first
group composed of jumps that are equal in magnitude
to , and the other equals with .
•The jumps result in extra losses in the damper circuit.
𝑉𝑗1
2
𝑉𝑗2
2
26. 3.3.2 With Overlap:
Analysis of Mode 1 : Inverter equations
To operate as an inverter, an advance angle β is defined
where β = π – α, and use opposite polarity for the dc
voltage with voltage rise opposite to the direction of
current. Thus:
28. 3.3.2 With Overlap:
Analysis of Mode 1 : AC current and DC voltage
harmonics
The waveform of the valve voltage and current are
distorted. And so, the expressions derived for the case
w/out overlap becomes invalid. Through Fourier
Analysis, the actual expression for the current is :
Where Φ is the p.f angle and δ = α + u
29. 3.3.2 With Overlap:
Analysis of Mode 1 : AC current and DC voltage
harmonics
From those expressions Φ can be obtained by:
The harmonic components in the AC current are also
changed. The following is reduced form the values
calculated with no overlap and is called the reduction
factor:
30. 3.3.2 With Overlap:
Analysis of Mode 1 : AC current and DC voltage
harmonics
The DC voltage expression are also affected due to
overlap. It can be shown that
31. 3.3.2 With Overlap:
Analysis of Mode 2
•Mode 1 is the normal mode of operation. Mode 2
occurs during DC line faults or a dip in the AC voltage
occurs.
•The overlap angle u may exceed 60°.
•When u>60°, the minimum number of valves
conducting are three and there are intervals where four
valves.
36. 3.3.2 With Overlap:
Analysis of Mode 2 : Average Direct
Voltage
In this case, the comparison between eqs. 3.50 and
3.26 shows that Rc is three times that of the case
where the u<60°. When α=0, u reaches a value of 60°
when Id increases to : Id = Is [1 – cos 60°] = (0.5)Is.
At u=60°, three valves are conducting all the time. For
α≥30, it is possible for the current to be increased
further, which also increases u further. The reason the
overlap angle cannot go beyond 60° for α<30° is shown
in the next figure.
37. 3.3.2 With Overlap:
Analysis of Mode 2 : Average Direct
Voltage
As an example, picture valve 2 and 6 are still conducting, the
anode of valve 3 is at a potential of and the𝑒 𝑏 + 𝑒 𝑐
2
=
−𝑒 𝑎
2
38. 3.3.2 With Overlap:
Analysis of Mode 2 : Average Direct
Voltage
Cathode is at a potential of ea. Hence, unless ea is
negative, valve 3 cannot conduct and this is possible
only for α≥30°. Thus there is an intermediate mode
when the value of overlap angle remains constant at
60°. In this mode, an increase in direct current is
accompanied by automatic increase in the firing angle.
39. 3.3.2 With Overlap:
Analysis of Mode 2 : DC and Valve Voltage
Waveforms
Instantaneous voltage
across the converter
bridge (vd)
Valve voltage of #3 and
#4 valves.
40. 3.3.2 With Overlap:
Analysis of Mode 2 : DC and Valve Voltage
Waveforms
The instantaneous voltage across the bridge can have
both positive and negative excursions, followed by
periods of zero magnitude. The valve voltage has 6
jumps with three of the having the magnitude
41. Reference:
Padiyar, K. R. (1990). HVDC Power Transmission
Systems: Technology and System Interactions. New
Delhi: New Age International