International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
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.
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.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
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.
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.
Design and analysis of boost converter with cld celleSAT Journals
Abstract
In this paper, the output voltage in renewable energy sources is improved by using DC-DC converter topology. Basically Boost
converter is used for improving the voltage gain. In this converter switching frequency is limited, hence the output voltage is
reduced. To overcome this issue, by using the boost converter with CLD cell is proposed .In this proposed paper for comparing
the voltage stress and efficiency by using two converters topology. For the duty ratio of 0.5 the output voltage is compared with
the conventional boost converter.
Keywords- Boost Converter, Boost Converter with CLD, Voltage Stress
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.
Simulation and Comparison of DVR and DSTATCOM Used for voltage sag mitigation...paperpublications3
Abstract: Power Quality problem in a system leads to various disturbances such as voltage fluctuations, transients and waveform distortions that results in a mis-operation or a failure of end user equipment. There are different types of custom power devices like Distribution Static Compensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) which can effectively use for mitigation of different type of power quality problems. This paper describes the technique of correcting the supply voltage sag distributed system and also describes performance comparison are presented between DVR and DSTATCOM to know how both the devices successfully been applied to power system for regulating system voltage effectively. DSTATCOM and DVR both of them based on VSI principle. A DVR is a series compensation device which injects a voltage in series with system and a DSTATCOM is a shunt compensation device which injects a current into the system to correct the power quality problems. This paper presents a power system operation with PI controller with abc to dq0 convertor approach. Total Harmonics Distortion (THD) is also calculated for the system with and without compensation. Results are presented to assess the performance of devices as a potential custom power solution. Improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of DVR & DSTATCOM in MATLAB/Simulink.
Power-supply is an electronic circuit that is used for the purpose of providing the electrical-power to appliances or loads such as machines, computers, & so on
Brushless DC motor is a synchronous machine that makes use of electronic commutation instead of mechanical commutator. Brushless DC motors makes use of inverter encompassing static switches for its operation. A simple bridge converter when used for BLDC drive as front end converter makes input source power factor to get reduced which is unacceptable in the power system. To avoid the distortions in the source voltage and source currents, Buck converter which was used as power factor correction (PFC) converter in this paper to improve the power factor. Presence of power electronic converters deteriorates system power factor effecting overall system performance. This paper presents buck converter for power factor correction in brushless DC motor drive system. Buck converter is operated with current control strategy rather to conventional voltage follower control. Simulation model was obtained using MATLAB/SIMULINK software and the brushless DC motor performance characteristics were shown for conditions with different DC link voltages and step variation in DC link voltage. Total harmonic distortion in source current was also presented.
Design and analysis of boost converter with cld celleSAT Journals
Abstract
In this paper, the output voltage in renewable energy sources is improved by using DC-DC converter topology. Basically Boost
converter is used for improving the voltage gain. In this converter switching frequency is limited, hence the output voltage is
reduced. To overcome this issue, by using the boost converter with CLD cell is proposed .In this proposed paper for comparing
the voltage stress and efficiency by using two converters topology. For the duty ratio of 0.5 the output voltage is compared with
the conventional boost converter.
Keywords- Boost Converter, Boost Converter with CLD, Voltage Stress
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.
Simulation and Comparison of DVR and DSTATCOM Used for voltage sag mitigation...paperpublications3
Abstract: Power Quality problem in a system leads to various disturbances such as voltage fluctuations, transients and waveform distortions that results in a mis-operation or a failure of end user equipment. There are different types of custom power devices like Distribution Static Compensator (D-STATCOM) and Dynamic Voltage Restorer (DVR) which can effectively use for mitigation of different type of power quality problems. This paper describes the technique of correcting the supply voltage sag distributed system and also describes performance comparison are presented between DVR and DSTATCOM to know how both the devices successfully been applied to power system for regulating system voltage effectively. DSTATCOM and DVR both of them based on VSI principle. A DVR is a series compensation device which injects a voltage in series with system and a DSTATCOM is a shunt compensation device which injects a current into the system to correct the power quality problems. This paper presents a power system operation with PI controller with abc to dq0 convertor approach. Total Harmonics Distortion (THD) is also calculated for the system with and without compensation. Results are presented to assess the performance of devices as a potential custom power solution. Improve dynamic voltage control and thus increase system load ability. This paper presents modeling and simulation of DVR & DSTATCOM in MATLAB/Simulink.
Power-supply is an electronic circuit that is used for the purpose of providing the electrical-power to appliances or loads such as machines, computers, & so on
Brushless DC motor is a synchronous machine that makes use of electronic commutation instead of mechanical commutator. Brushless DC motors makes use of inverter encompassing static switches for its operation. A simple bridge converter when used for BLDC drive as front end converter makes input source power factor to get reduced which is unacceptable in the power system. To avoid the distortions in the source voltage and source currents, Buck converter which was used as power factor correction (PFC) converter in this paper to improve the power factor. Presence of power electronic converters deteriorates system power factor effecting overall system performance. This paper presents buck converter for power factor correction in brushless DC motor drive system. Buck converter is operated with current control strategy rather to conventional voltage follower control. Simulation model was obtained using MATLAB/SIMULINK software and the brushless DC motor performance characteristics were shown for conditions with different DC link voltages and step variation in DC link voltage. Total harmonic distortion in source current was also presented.
Gestion del conocimiento y bibliotecas universitarias ¿el qué, cómo y para qué?
El presente artículo tiene como propósito proponer la incorporación de la teoría administrativa denominada Gestión del Conocimiento (GC), en Bibliotecas Universitarias (BU). ¿El qué, el cómo y el para qué? Representa un reto de gestión que conlleva a la implementación de diversas estrategias para el cambio y la innovación (ECI). Hipotéticamente, el diseño de estrategias de gestión posibilita que la BU en los escenarios competitivos de la sociedad de conocimiento y el tercer entorno desarrolle nuevas competencias y directrices para el aprovechamiento de sus diversos recursos con eficiencia y logren alcanzar sus objetivos con eficacia. La innovación es otra de las variables que posibilita la transformación de los servicios que son ofertados a los usuarios, también denominados “socios estratégicos”, bajo la visión de creatividad, sustentabilidad y bienestar.
Equipo 09 - DEDALO - Estrategias para proyecto colaborativo de aprendizaje vi...plucindom
Establece dos estrategias innovadoras para mejorar la disponibilidad de los Discentes en cuanto a la utilizacion de Ambientes Colaborativos y Herramientas Web 2.0, para el Curso Comunidades virtuales de aprendizaje (ART): Semana 2 -
San Antonio Criminal Lawyer Carl Lobitz is a Texas Board Certified Criminal Law Specialist with 25 years experience. Call Carl 24 hours a day at 210.573.6645. Initial consultation is always free.
Coupled Inductor Based High Step-Up DC-DC Converter for Multi Input PV SystemIJERA Editor
With the shortage of the energy and ever increasing of the oil price, research on the renewable and green energy
sources, especially the solar arrays and the fuel cells, becomes more and more important. How to achieve high
step-up and high efficiency DC/DC converters is the major consideration in the renewable power applications
due to the low voltage of PV arrays and fuel cells. In this paper a coupled inductor dc-dc converter for photovoltaic
system is proposed. The circuit configuration of the proposed converter is very simple. Thus, the
proposed converter has higher step-up and step-down voltage gains than the conventional bidirectional dc–dc
boost/buck converter. Under same electric specifications for the proposed converter and the conventional
bidirectional boost/buck converter, the average value of the switch current in the proposed converter is less than
the conventional bidirectional boost/buck converter. The operating principles have been applied to multi input
photovoltaic system and outputs have been observed.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
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.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Single-Input Double Output High Efficient Boost Dc–Dc ConverterIJMER
The aim of this project is to develop a high-efficiency single-input multiple-output (SIMO) dc–dc converter. The proposed converter can boost the voltage of a low-voltage input power source to a controllable high-voltage dc bus and middle-voltage output terminals. The high-voltage dc bus can take as the main power for a high-voltage dc load or the front terminal of a dc–ac inverter.Moreover, middle-voltage output terminals can supply powers for individual middle-voltage dc loads or for charging auxiliary power sources (e.g., battery modules). In this project, a coupled-inductor based dc–dc converter scheme utilizes only one power switch with the properties of voltage clamping and soft switching, and the corresponding device specifications are adequately designed. As a result, the objectives of high-efficiency power conversion, high step up ratio, and various output voltages with different levels can be obtained
Transformer less Boost Converter Topologies with Improved Voltage Gain Operat...IJMER
In this project, a new step up converter proposed in a recent work is analyzed, designed, simulated with MATLAB Simulink. Conventional dc–dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformer less dc–dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple.
Modern trend in power generation is the use of two-stage configuration i.e., allocating a single PV cell
to a converter to produce grid voltage of adequate requirement and then to convert DC to AC voltage for grid
cnnection. Usually, the first stage is a DC-DC boost type converter which is responsible for extracting maximum
power from panel and boosting PV voltage to a value higher than peak of grid voltage. A converter is proposed,
which is derived from an active network based converter, is chosen as the first stage and a five level inverter is
used as the second stage of the configuration. Thus, in overall, the converter used is having high gain and reduced
switching stress. The Inverter used is having the advantage of low filter requirement, reduced stress, EMI and
reduced THD level. A closed loop control of the converter is done to maintain constant output voltage under
varying input voltage. MATLAB R2014a version software is used to simulate the model. The prototype of the
two stage configuration was developed and tested in the laboratory and results were verified using PIC 16F877A.
Fuzzy based control of Transformer less Coupled inductor based DC-DC converterIJERA Editor
Most of the industrial applications use any one of the basic DC-DC converter configurations namely buck,
boost, buck–boost, and Cuk converters. These converters are non-isolating converters. Buck-boost converters
use inductors for storing energy from the source and release the same to load or output. This results in high
stress across magnetic components. This drawback restricts usage of buck-boost converters to low power
applications. Flyback converters popularly have known as buck-boost converters uses transformers for
achieving wide range of step down and step up voltages. Coupled inductor based converters or tapped inductor
based converters are used for achieving wide input – wide output conversion ratios. Coherent transition between
step-down and step-up modes is achieved by a proper control scheme. This paper proposes fuzzy logic based
closed loop control scheme for control of converter switches. Theoretical derivations of control parameters with
their membership values, mamdani based rules for development of fuzzy rules and simulation results of a
coupled inductor based DC-DC converter using MATLAB / SIMULINK are concluded.
This paper presents the simulation design of dc/dc interleaved boost converter with zero-voltage switching (ZVS). By employin the interleaved structure, the input current stresses to switching devices were reduced and this signified to a switching conduction loss reduction. All the parameters had been calculated theoretically. The proposed converter circuit was simulated by using MATLAB/Simulink and PSpice software programmes. The converter circuit model, with specifications of output power of 200 W, input voltage range from 10~60 V, and operates at 100 kHz switching frequency was simulated to validate the designed parameters. The results showed that the main switches of the model converter circuit achieved ZVS conditions during the interleaving operation. Consequently, the switching losses in the main switching devices were reduced. Thus, the proposed converter circuit model offers advantages of input current stress and switching loss reductions. Hence, based on the designed parameters and results, the converter model can be extended for hardware implementation.
Electrical Discharge Machining Flyback Converter using UC3842 Current Mode PW...IJPEDS-IAES
This paper presents a current mode Pulse Width Modulation (PWM) controlled Flyback converter using UC3842 for Electrical Discharge Machining current generator control circuit. Circuit simplicity and high efficiency can be achieved by a Flyback converter with current mode PWM controller. The behaviors of the system's operation is analyzed and discussed by varying the load resistance. Matlab sofware is used to simulate the Flyback converter where a prototype has been built and tested to verify its performance.
High gain dc-dc step up converters have been used in renewable energy systems, for example, photovoltaic grid connected system and fuel cell power plant to step up the low level dc voltage to a high level dc bus voltage. If the conventional boost converter is to meet this demand, it should be operated at an extreme duty cycle (duty cycle closes to unity), which will cause electromagnetic interference, reverse recovery problem and conduction loss at the power switches. This paper proposes a class of non-isolated dc-dc step up converters which provide very high voltage gain at a small duty cycle (duty cycle < 0.5). Firstly, the converter topologies are derived based on active switched inductor network and combination of active and passive switched inductor networks; secondly, the modes of operation of proposed active switched inductor converter and combined active and passive switched inductor converter are illustrated; thirdly, the performance of the proposed converters are analyzed mathematically in details and compared with conventional boost converter. Finally, the analysis is verified by simulation results.
Transformerless DC-DC Converter Using Cockcroft-Walton Voltage Multiplier to ...IJERA Editor
In the present scenario the use of transformer for high voltages in converter circuit reduces the overall operating
efficiency due to leakage inductance and use of transformer also increases the operational cost. . Therefore the
proposed system is implemented with transformer less DC-DC converter so as to obtain high DC voltage with
the use of nine stage Cockcroft-Walton (CW) voltage multiplier. The proposed converter operates in CCM
(continuous conduction mode), so that the converter switch stress, the switching losses are reduced. The DC
voltage at the input of the proposed model is low and is boosted up by boost inductor (Ls) in DC-DC converter
stage and performs inverter operation. The number of stages in CW-voltage multiplier circuit is applied with
low input pulsating DC (AC Voltage) voltage where it is getting converted to high DC output voltage. The
proposed converter switches operates at two independent frequencies, modulating (fsm) andalternating (fsc)
frequency. The fsm operates at higher frequency of the output while the fsc operates at lower frequency of the
desired output voltage ripple and the output ripples can be adjusted by the switch Sc1 and Sc2. The regulation of
the output voltage is achieved by controlling the Duty ratio.The simulation is carried over by the MATLABSIMULINK.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
Variable Voltage Source Equivalent Model of Modular Multilevel ConverterIJRES Journal
The structures of modular multilevel converter module (MMC) are very complex, and the
numerous sub-modules and output level number bring difficulties for the analysis and simulation. In this paper,
assuming the sub-capacitor voltage instantaneous value of a single arm is the same value, the switching
frequency of the switch is much higher than the output voltage frequency, the system harmonics were ignored,
the system state equations are deduced about the intermediate variables as circulation current and the capacitor
voltage between the upper and lower arms. On this basis, a variable voltage source continuous equivalent
model is proposed, which may replace the system physical simulation model with the actual simulation study. At
the same time, the model reflects the relationship between the output voltage and circulation current,which
provide a way to analyze the formation mechanism of circulation and the capacitor voltage fluctuations, and
make system analysis simple and intuitive. The simulation results validate that this continuous model is
rationality and correctness.
Dr. Sean Tan, Head of Data Science, Changi Airport Group
Discover how Changi Airport Group (CAG) leverages graph technologies and generative AI to revolutionize their search capabilities. This session delves into the unique search needs of CAG’s diverse passengers and customers, showcasing how graph data structures enhance the accuracy and relevance of AI-generated search results, mitigating the risk of “hallucinations” and improving the overall customer journey.
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
Sudheer Mechineni, Head of Application Frameworks, Standard Chartered Bank
Discover how Standard Chartered Bank harnessed the power of Neo4j to transform complex data access challenges into a dynamic, scalable graph database solution. This keynote will cover their journey from initial adoption to deploying a fully automated, enterprise-grade causal cluster, highlighting key strategies for modelling organisational changes and ensuring robust disaster recovery. Learn how these innovations have not only enhanced Standard Chartered Bank’s data infrastructure but also positioned them as pioneers in the banking sector’s adoption of graph technology.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...
Ms3621652169
1. Yellaiah.Ponnam et al Int. Journal of Engineering Research and Applications
ISSN: 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.2165-2169
RESEARCH ARTICLE
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OPEN ACCESS
Dc Motor Fed Dc-Dc Converter with High Step-Up Voltage Gain
Brahmam Yadav Vakadani1, K.Rajasri2, Andavolu Veenadhari3, Yellaiah.P
(Assistant Professors ,Department of EEE, Malla Reddy Engineering College For Women, JNTU-Hyd, AP,
INDIA)1,2,3
(Assistant Professor, Department of EEE, Guru Nanak Institute of Technology, JNTU-Hyd, AP, INDIA)4
Abstract
This paper presents DC motor fed using DC-DC converter with high step-up voltage gain. The conventional
buck-boost converter has the disadvantage of low voltage gain and has voltage stresses on the switching devices.
But in proposed converter by using two inductors with the same level of inductance are charged in parallel
during the switch-on period, and are discharged in series during the switch-off period. By using this proposed
converter we can achieve high step-up voltage gain without an extremely high duty ratio. The output of the
proposed converter is given as input to control the speed of DC motor. This contributes to significant reduction
in cost and size while maintaining high conversion efficiency. The simulation of DC motor fed DC-DC
converter is carried out on MATLAB /SIMULINK. Simulation results for DC motor fed proposed DC-DC
converter are studied
Index Terms - DC-DC boost converter, High step-up voltage gain, Power stage.
I.
INTRODUCTION
Speed control of DC Motor can be achieved
by various techniques. This paper is intended to
provide a unique solution for low input voltage
problems. Theoretically the DC-DC boost converter
can achieve a high step up voltage gain with an
extremely high duty ratio. However, in practice, the
step up voltage gain is limited due to the effect of
power switches, rectifier diodes and the equivalent
series resistance (ESR) of inductors and capacitors.
Also the extremely high duty ratio[5-6] operation will
result in serious reverse recovery problem. Many
topologies have been presented to provide speed
control for a DC motor with low voltage as input. The
DC-DC fly back converter[2-9] is a very simple
structure with high step up voltage gain and electrical
isolation, but the active switch of this converter will
suffer high voltage stress due to the leakage
inductance and minimizing the voltage stress on the
active switch, some energy regeneration techniques
have proposed to clamp the voltage stress on the
active switch and to recycle the leakage inductance
energy. The coupled inductor techniques provide
solutions to achieve high voltage gain. Low voltage
stresses on active switches, and high efficiency
without the penalty of high duty ratio[7]. Some
literatures research the tansformerless DC-DC
converters, which include cascade boost type, the
quadratic boost type, the voltage lift type, the
capacitor diode voltage multiplier type and the boost
type integrating with switched inductor technique[13]. The structure of this converter is very simple.
Only one power stage is used in this converter.
However, this converter has two issues:
1) Three power devices exist in the current flow
path during the switch on period and two power
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devices exist in the current flow path during
switch of period.
2) The voltage stress on active switch equals the
output voltage.
A non-magnetic DC-DC high step up
converter is proposed in this paper to control speed of
a DC motor. Compared with the conventional
converter, proposed converter has the following
merits:
1) Two power devices exist in the current path
during switch on period and one power device
exists in the current path during switch off
period.
2) The voltage stresses on the active switches are
less than the output voltage.
3) Under the same operating conditions, including
input voltage, output voltage and output power,
the current stress on the active switch of the
conventional converter[10].
For getting higher step up voltage gain, the
other DC-DC converters are also proposed in this
paper. These three proposed DC-DC converters
utilize the switched inductor technique, which two
inductors with same level of inductance are charged
in parallel during the switch-on period and are
discharged in series during the switch off period. To
achieve high step up voltage gain without the
extremely high duty ratio. The operating principles
and steady state analysis are discussed in the
following sections. To analyze the steady state
characteristics of the proposed converters, some
conditions are assumed as:
1) All components are ideal. The ON state
resistance RDS(ON) of the active switches, the
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2. Yellaiah.Ponnam et al Int. Journal of Engineering Research and Applications
ISSN: 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.2165-2169
forward voltage drop of the diodes, and the ERS
of the inductors and capacitors are ignored
2) All capacitors are sufficiently large, and the
voltage across the capacitors can be constant.
II.
DC MACHINE
Back EMF induced in motor armature. When current
passed through the armature of dc machines and its
field coils excited torque is established and motor
rotates the direction of rotation can be reversed by
reversing either armature current or polarity of the
magnets. Rotation of the armature gives rise to an
induced emf which according to Lenz’s law, will
oppose the flow of current. Hence if Ea= the
numerical value of the induced emf.
Va=the numerical value of the applied voltage
.
The armature currents is given by
𝐼𝑎= (𝑉𝑎 –𝐸𝑎) /rm
𝑉𝑎= 𝐸𝑎 + 𝐼𝑎 𝑟 𝑚
The power input 𝑉𝑎 𝐼 𝑎 =𝐸𝑎 𝐼𝑎+𝐼 2 𝑟 𝑚
𝑎
The emf generated by the armature must have a
perfectly definite value for particular value of the
load current 𝐸𝑎 = 𝑉𝑎 – 𝐼𝑎 rm
The induced emf is also determined from ordinary
considerations of flux, number of conductors and
speed, and its thus
𝐸𝑎 =𝑍e×2pᴓn
From above equations are equal we get
𝑉𝑎 - 𝐼𝑎 𝑟𝑚 = 𝑍𝑒 × 2pᴓn
n=
𝑉𝑎 −𝐼𝑎 𝑟 𝑚
𝑍𝑒 𝑋 2𝑃∅
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𝟏
𝝎𝒎 𝜶
𝒇
Armature control: - In this the field current is
maintained constant. Then the speed is derived from
the equation as
𝑤 𝑚 =(𝑣−𝑖𝑎𝑅𝑎)
Hence, varying the applied voltage changes
speed. Reversing the applied voltage changes the
direction of rotation of the motor
Armature and Field control:- By combination
armature and field control for speeds below and
above the rated speed, respectively, a wide range of
speed control is possible
𝑇 𝑒 =𝐾∅ 𝑓 𝑖 𝑎
Can be normalized if it is divided by rated torque
Which is expressed as
𝑇 𝑒𝑟 =𝐾∅ 𝑓𝑟 𝑖 𝑎𝑟
𝑇 𝑒𝑛 =
𝑇𝑒
= 𝐾
𝑇𝑒𝑟
∅𝑓 𝑖𝑎
𝐾∅𝑓𝑟 𝑖𝑎𝑟
. =K∅ 𝑓𝑛 𝑖 𝑎𝑛 P.U
Normalized eliminates machine constants,
compacts the performance equation, and enables the
visualization
of
performance
characteristics
regardless of machine size on same scale. the
normalized torque, flux and armature current are
𝑇𝑒
𝑇 𝑒𝑛 =
P.U
𝑇𝑒𝑟
∅ 𝑓𝑛 =
𝑖 𝑎𝑛 =
∅𝑓
∅𝑓𝑟
𝑖𝑎
𝑖 𝑎𝑟
P.U
P.U
As the armature current is maintained at 1 p.u
𝑇 𝑒𝑛 =∅ 𝑓𝑛 ,𝑝.𝑢
Fig.1 DC motor basic parts
Hence normalized electromagnetic torque
characteristics coincides with normalized field flux,
similarly the air gap power is,
𝑝 𝑎𝑛 =𝑒 𝑛 𝑖 𝑎𝑛 , 𝑝.𝑢
Where 𝑒 𝑛 is the normalized induced emf.
As 𝑖 𝑎𝑛 is set to 1 p.u.,
the normalized air gap power becomes
𝑝 𝑎𝑛 = 𝑒 𝑛 ,𝑝.𝑢
Hence the speed of dc motor may be controlled by
1. Varying the value of the flux.
2. Varying the value of the voltage applied to the
motor armature
3. Varying the value of the effective number of
conductors in series
Field control: - In field control the applied armature
voltage v is maintained constant. Then the speed is
represented by equation as
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3. Yellaiah.Ponnam et al Int. Journal of Engineering Research and Applications
ISSN: 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.2165-2169
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Mode 2 [t1, t2]:
Fig.4 DC motor fed proposed converter in mode-1
operation.
Fig.2 normalized characteristics of variable –speed
DC motor.
III.
DC MOTOR FED PROPOSED
CONVERTER.
Mode 2 [t1, t2]:
During this time interval, S1 and S2 are
turned off. The equivalent circuit is shown in Fig.
4(b). The DC source, L1, and L2 are series-connected
to transfer the energies to Co and the load. Thus, the
voltages across L1 and L2 are derived as
v L1 v L 2
Vin Vo
2
By using the volt-second balance principle on L1 and
L2, the following equation can be obtained
𝐷𝑇 𝑠
𝑇𝑠
𝑣 𝑖𝑛 − 𝑣 𝑜
𝑣 𝑖𝑛 𝑑𝑡 +
𝑑𝑡 = 0
2
0
𝐷𝑇 𝑠
Fig. 3 DC motor fed proposed converter
The Proposed converter , which consists of
two active switches (S1 and S2),two inductors (L1
and L2) that have the same level of inductance, one
output diode Do, and one output capacitor Co.
SwitchesS1 and S2 are controlled simultaneously by
using one control signal. Some typical waveforms
obtained during continuous conduction mode (CCM)
and discontinuous conduction mode (DCM) can be
plotted. The operating principles and steady-state
analysis of CCM and DCM are presented in details
follows
Then the voltage gain is given by
𝑀 𝐶𝐶𝑀 =
𝑣 𝑖𝑛 1 + 𝐷
=
𝑣𝑜
1− 𝐷
the voltage stresses on S1, S2, and Do are derived as
𝑉𝑜 + 𝑉𝑖𝑛
𝑉 𝑠1 = 𝑉 𝑠2 =
2
𝑉 𝐷𝑜 = 𝑉𝑜 + 𝑉𝑖𝑛
CCM Operation
The operating modes can be divided into
two modes ,defined as modes 1 and 2.
Mode 1 [t0, t1]:
During this time interval, switches S1 and S2
are turned on. Inductors L1 and L2 are charged in
parallel from the DC source, and the energy stored in
output capacitor Co is released to the load. Thus, the
voltages across L1 and L2 are given As
v L1 v L 2 vin
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Fig.5 DC motor fed proposed converter in mode-2
operation
DCM Operation
The operating modes can be divided into three
modes,
defined as modes 1, 2, and 3.
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4. Yellaiah.Ponnam et al Int. Journal of Engineering Research and Applications
ISSN: 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.2165-2169
Mode 1 [t0, t1]:
The operating principle is same as that for
mode 1 of CCM operation. The two peak currents of
L1 and L2 can be found as
𝐼 𝐿1𝑃 = 𝐼 𝐿2𝑃 =
IV.
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TYPICAL WAVE FORMS OF
PROPOSED CONVERTER IN CCM
and DCM OPERATION
𝑣 𝑖𝑛
𝐷𝑇𝑠
𝐿
Where L is the inductance of L1 and L2.
Mode 2 [t1, t2]:
During this time interval, S1 and S2 are
turned off. The equivalent circuit is shown in the
figure. The DC source, L1, and L2 are seriesconnected to transfer the energies to Co and the load.
Inductor currents iL1 and iL2 are decreased to zero at
t = t2. Another expression of IL1p and IL2pis given
as
𝐼 𝐿1𝑃 = 𝐼 𝐿2𝑃 =
𝑣 𝑜 − 𝑣 𝑖𝑛
𝐷2 𝑇𝑠
2𝐿
Mode 3 [t2, t3]:
During this time interval, S1 and S2 are still
turned off. The energy stored in L1 & L2 is Zero.
Thus only the energy stored in Co is discharged to the
load.
Thus D2 can be derived as follows
Thus, only
𝐷2 =
2𝐷𝑣 𝑖𝑛
𝑣 𝑜 −𝑣 𝑖𝑛
And finally the voltage gain is given by the
𝑀 𝐷𝐶𝑀 =
𝑉𝑜
1
1
𝐷2
= +
+
𝑉𝑖𝑛 2
4
𝑇𝐿
Fig 8. Typical waveforms for proposed converter
in CCM and DCM operation.
V.
SIMULATION RESULTS
In order to verify the performance of
proposed converter in the application of DC motor, a
simulation
circuit
is
designed
in
MATLAB/SIMULINK. The circuit specifications are
Vin=35V , Va=230 speed =176rad/sec L1=L2=0.1mH.
Also, MOSFET NTY100N10 is selected for switches
S1 and S2, and the schottky diode MBR20200CT is
selected for diode D0.Under the above stated
conditions, the experimental results are shown in the
Fig.9. Also, the input current equals twice the level
of the inductor current during the switch-on period,
and equals the inductor current during the switch-off
period. By this proposed converter the output voltage
gain is increased and the voltage stress are also
reduced.
In fig.9. the simulation outputs of the
armature current (A), speed (rad/sec), field current
and electrical torque Te are shown.
Fig.6 DC motor fed proposed converter in
discontinuous conduction mode.
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5. Yellaiah.Ponnam et al Int. Journal of Engineering Research and Applications
ISSN: 2248-9622, Vol. 3, Issue 6, Nov-Dec 2013, pp.2165-2169
[4]
[5]
[6]
[7]
[8]
Fig.9 Simulation output waveforms of dc motor
fed proposed converter.
[9]
VI.
CONCLUSION
This paper researches a DC motor fed
proposed DC-DC converter The structure of the
proposed converter is very simple. As the voltage
stresses on the active switches are low, active
switches with low voltage rating and low on state
resistance levels can be selected. The proposed
converter has higher step-up voltage gain than the
conventional boost converter. From the simulation
results , it is see that the waveforms agree with the
operating principle and steady state analysis. The
proposed converter is higher than the conventional.
[10]
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