This document summarizes the simulation of a brushless DC motor (BLDC) fed by two types of multilevel inverters - a five-level diode clamped inverter and a five-level cascaded H-bridge inverter. It first describes the operating principles and switching techniques of the two inverter topologies. It then presents the modeling of the BLDC motor. Simulation results are shown for the firing pulses, line voltages, stator currents, back EMF, speed, torque, etc. of the BLDC motor when powered by each inverter configuration. The performance of the motor fed by the two multilevel inverters is compared.
Modeling of solar array and analyze the current transientEditor Jacotech
Spacecraft bus voltage is regulated by power
conditioning unit using switching shunt voltage regulator having
solar array cells as the primary source of power. This source
switches between the bus loads and the shunt switch for fine
control of spacecraft bus voltage. The effect of solar array cell
capacitance [5][6] along with inductance and resistance of the
interface wires between solar cells and power conditioning
unit[1], generates damped sinusoidal currents superimposed on
the short circuit current of solar cell when shunted through
switch. The peak current stress on the shunt switch is to be
considered in the selection of shunt switch in power conditioning
unit. The analysis of current transients of shunt switch in PCU
considering actual spacecraft interface wire length by
illumination of solar panel (combination of series and parallel
solar cells) is difficult with hardware simulation. Software
simulation by modeling solar cell is carried out for a single string
(one parallel) in Pspice [6]. Since in spacecrafts number of
parallels and interface cable length are variable parameters the
analysis of current transients of shunt switch is carried out by
modeling solar array with the help of solar cell model[6] for the
actual spacecraft condition.
The calculation of a Triangle Voltage Stability Index (TVSI) for monitored alternating-current circuits using voltage data from a PSSE load flow study. The analysis provides TVSI values for monitored transmission circuits in the Bulk Electric System under varying power transfers and contingencies.
TVSI provides an indication of the closeness of the load voltage to potential voltage collapse. To provide situational awareness to system operators, AEP proposes monitoring the phase angle across a low loss EHV overhead circuit operating in a system environment and comparing the angle to an established phase angle loci as a proxy for TVSI.
This monitoring could be independent of the line loading or the associated line impedance.
Modeling of solar array and analyze the current transientEditor Jacotech
Spacecraft bus voltage is regulated by power
conditioning unit using switching shunt voltage regulator having
solar array cells as the primary source of power. This source
switches between the bus loads and the shunt switch for fine
control of spacecraft bus voltage. The effect of solar array cell
capacitance [5][6] along with inductance and resistance of the
interface wires between solar cells and power conditioning
unit[1], generates damped sinusoidal currents superimposed on
the short circuit current of solar cell when shunted through
switch. The peak current stress on the shunt switch is to be
considered in the selection of shunt switch in power conditioning
unit. The analysis of current transients of shunt switch in PCU
considering actual spacecraft interface wire length by
illumination of solar panel (combination of series and parallel
solar cells) is difficult with hardware simulation. Software
simulation by modeling solar cell is carried out for a single string
(one parallel) in Pspice [6]. Since in spacecrafts number of
parallels and interface cable length are variable parameters the
analysis of current transients of shunt switch is carried out by
modeling solar array with the help of solar cell model[6] for the
actual spacecraft condition.
The calculation of a Triangle Voltage Stability Index (TVSI) for monitored alternating-current circuits using voltage data from a PSSE load flow study. The analysis provides TVSI values for monitored transmission circuits in the Bulk Electric System under varying power transfers and contingencies.
TVSI provides an indication of the closeness of the load voltage to potential voltage collapse. To provide situational awareness to system operators, AEP proposes monitoring the phase angle across a low loss EHV overhead circuit operating in a system environment and comparing the angle to an established phase angle loci as a proxy for TVSI.
This monitoring could be independent of the line loading or the associated line impedance.
Towards An Accurate Modeling of Frequency-dependent Wind Farm Components Unde...IJAPEJOURNAL
Frequency dependence complete model is set up for describing the lightning transient behavior of the wind turbines (WTs).To get an appropriate wind turbine model, a high frequency models of surge arrester protecting the boost transformer, transformer and ground electrode soil ionization are implemented. The transient responses and Ground Potential Rise (GPR) can be obtained at different locations in the WTs and connected grid in the time domain as well as in the frequency domain using Fast Fourier Transform (FFT). To check the validity of the model, Surge arresters protection level at different locations, at i.e. LV, MV and HV, is compared with ABB manufacture data sheet, Also a comparison has been made between simple and frequency dependence model of overall wind farm components using ATP/EMTP. This paper provides an accurate simulation of wind farm components under transient condition.
Modeling Of Converter “Single Phase to Three Phase by Using Single Phase Sup...IJMER
In Industrial application, two form of Electrical Energy is used. Direct current (DC) form and
Alternative current (AC) form. In this paper single phase to three phase converter model is developed
with the help of SIMULINK tool box of the MATLAB software. First of all single phase AC power is
converted into DC power using diode rectifier bridge after this DC power is converted into three phase
AC power with the help of three arms IGBT Inverter bridge. After the three phase conversion Three
phase Induction Motor is run. They are ideal for future workshops, small industry, large building. Using
the simulation result output of the model can be varied as per requirement of the applications.
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 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.
Towards An Accurate Modeling of Frequency-dependent Wind Farm Components Unde...IJAPEJOURNAL
Frequency dependence complete model is set up for describing the lightning transient behavior of the wind turbines (WTs).To get an appropriate wind turbine model, a high frequency models of surge arrester protecting the boost transformer, transformer and ground electrode soil ionization are implemented. The transient responses and Ground Potential Rise (GPR) can be obtained at different locations in the WTs and connected grid in the time domain as well as in the frequency domain using Fast Fourier Transform (FFT). To check the validity of the model, Surge arresters protection level at different locations, at i.e. LV, MV and HV, is compared with ABB manufacture data sheet, Also a comparison has been made between simple and frequency dependence model of overall wind farm components using ATP/EMTP. This paper provides an accurate simulation of wind farm components under transient condition.
Modeling Of Converter “Single Phase to Three Phase by Using Single Phase Sup...IJMER
In Industrial application, two form of Electrical Energy is used. Direct current (DC) form and
Alternative current (AC) form. In this paper single phase to three phase converter model is developed
with the help of SIMULINK tool box of the MATLAB software. First of all single phase AC power is
converted into DC power using diode rectifier bridge after this DC power is converted into three phase
AC power with the help of three arms IGBT Inverter bridge. After the three phase conversion Three
phase Induction Motor is run. They are ideal for future workshops, small industry, large building. Using
the simulation result output of the model can be varied as per requirement of the applications.
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 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 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.
Hacia un marketing ágil. Revista Marketing + Ventas 11/2014Joan Sardà
¿Qué tienen en común las empresas grandes y pequeñas con mayores tasas de crecimiento en sus mercados? Con o sin
crisis, ante un entorno en permanente cambio las empresas que están obteniendo mejores resultados en todo el mundo son
las que interiorizan una estrategia de profunda orientación al cliente, o customer-centricity, y una capacidad operativa fundamental, la agilidad.
Artículo publicado en la revista Marketing + Ventas de Noviembre de 2014
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.
Role of the Private Sector in Conflict Prevention in Pakistan
Safwan A. Khan
Vaqar Ahmed
Sustainable Development Policy Institute
Stability: International Journal of Security & Development, 3(1): 24, pp. 1-9, DOI: http://dx.doi.org/10.5334/sta.dv
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.
Performance Evaluation of Nine Level Modified CHB Multilevel Inverter for Var...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
CMV analysis of 5-level Cascaded H-Bridge MLI with equal and unequal DC sourc...Mohd Esa
This paper, investigates the Common Mode Voltage (CMV)between neutral point of the star connected RL load and system ground.CMV also known as zero sequence voltage results in adverse effects like bearing currents, shaft voltages and electromagnetic interference.CMV also causes premature failure of bearings of induction motor and is necessary to reduce. In this paper, Variable Frequency Sinusoidal Pulse Width Modulation (VFSPWM) techniques are used to investigate CMV in Cascaded H-Bridge Multilevel Inverter (CHB-MLI). Comparison of 5-level CHB-MLI with equal and unequal DC sources in terms of CMV is also presented. Simulation of circuit is carried out in MATLAB environment.
CMV analysis of 5 level Cascaded H Bridge MLI with equal and unequal DC sourc...MOHD ABDUL MUQEEM NAWAZ
This paper, investigates the Common Mode Voltage (CMV)between neutral point of the star connected RL load and system ground.CMV also known as zero sequence voltage results in adverse effects like bearing currents, shaft voltages and electromagnetic interference.CMV also causes premature failure of bearings of induction motor and is necessary to reduce. In this paper, Variable Frequency Sinusoidal Pulse Width Modulation (VFSPWM) techniques are used to investigate CMV in Cascaded H-Bridge Multilevel Inverter (CHB-MLI). Comparison of 5-level CHB-MLI with equal and unequal DC sources in terms of CMV is also presented. Simulation of circuit is carried out in MATLAB environment.
This paper presents investigation and performance analysis of novel down sampling based clamping SV PWM technique for diode and cascaded Multi-level Invereter fed to Induction motor drive. A novel down sampling based clamping SVPWM has developed by adding triangular off set to sinusoidal fundamental waveform is modified by down sampling the reference wave by order of 10 so this technique is called clamping space vector pulse width modulation techniques such as PD, POD and APOD. so as to shift the lower order harmonics to higher order side. This novel carrier is compared with the offset injected space vector reference waveform to generate the required PWM pulses to the inverter. To analyze the performance of the proposed PWM technique it is implemented on seven level diode and cascaded Multi-level Inverter using Matlab/Simulink software tool for output line, phase voltage, currents, speed, torque and Total harmonic distortion analysis.
Analysis and Implementation of Unipolar PWM Strategies for Three Phase Cascad...IJAAS Team
This paper presents unipolar pulse width modulation technique with sinusoidal sampling pulse width modulation are analyzed for three-phase five-level, seven-level, nine-level and eleven-level cascaded multi-level inverter. The unipolar PWM method offers a good opportunity for the realization of the Three-phase inverter control, it is better to use the unipolar PWM method with single carrier wave compared to two reference waves. In such case the motor harmonic losses will be considerably lower.The necessary calculations for generation of unipolar pulse width modulation strategies have presented in detail. The unipolar SPWM voltage switching scheme is selected in this paper because this method offers the advantages of effectively doubling the switching frequency of the inverter voltage. The cascaded multi level inverter fed induction motor is simulated and compared the total harmonic distroction for all level (five-level, seven-level, nine-level and elevel-level)of the inverter. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
Study and Simulation of Seven Level - Ten Switch Inverter TopologyMohd Esa
Compared to conventional two-level inverter, multilevel inverter
performance is high because of their reduced harmonic distortion, less
electromagnetic interference, reduced common mode voltage and higher dc link
voltages. However complex pulse width modulation control, balancing of
capacitor voltages & increased number of switches are main drawbacks of
multilevel inverter.This paper focuses on study and simulation of single phase
seven level inverter topology using only ten switches. This paper also presents
two different control techniques for seven level-ten switch inverter topology.Rload
is connected to inverter and simulation is performed using
MATLAB/Simulink Software.
In recent research, there has been an extensive increase in interest to multilevel power
conversion. The introduction of new inverter topologies & unique modulation
techniques was involved in recent research studies. However, the most commonly
used multi-level inverter topologies are multi-cell inverter [1], diode clamped inverter
[2]-[5] and capacitor clamped inverter [6]. Some applications for these inverters
include industrial drives, flexible ac transmission systems [7], traction applications in
the transport industry and grid integration of non-conventional energy sources.
The seven level-ten switch topology is a symmetrical topology since the values of
all voltage sources are the same. However, there are several asymmetrical topologies
that need voltage sources of different values. This asymmetry results in the need of dc
voltage sources having a specific relation between them and also the difference in
rating of the semiconductor switches. This paper, presents study and simulation of a
new multilevel inverter topology named reversing voltage (RV) [8]. This topology
requires less number of components compared to conventional topologies. It is also
more efficient since the inverter has a component which operates the switching power
devices at line frequency. Therefore, there is no need for all switches to work in high
frequency which leads to simpler and more reliable control of the inverter. Two
different control techniques are used in this paper to drive the inverter .The simulation
results of the seven level-ten switch inverter topology are presented.
Multilevel inverters (MLI) are becoming more popular over the years for medium and high power applications because of its significant merits over two level inverters. This paper presents an implementation of multicarrier based sinusoidal pulse width modulation technique for three phase seven level diode clamped multilevel inverter. This topology is operated under phase opposition disposition pulse width modulation technique. The performance of three phase seven level diode clamped inverter is analyzed for induction motor (IM) load. Simulation is performed using MATLAB/SIMULINK. Experimental results are presented to validate the effectiveness of the operation of the diode clamped multilevel inverter using field programmable gate array.
Total Harmonic Distortion Analysis of Multilevel Inverter Fed To Induction Mo...IJERA Editor
This paper presents the control of a multilevel inverter supplied by a Photovoltaic (PV) panel and a batteries
bank. It is well known that the power quality of multilevel inverter signals depends on their number of levels.
However, the question that arises is whether there is a limit beyond which it is not necessary to increase the
number of level. This question is addressed in this paper. Three, nine and fifteen-level converters are studied.
The harmonics content of the output signals are analyzed. A simplified Pulse Width Modulation (SPWM)
method for a multilevel inverter that supplied an induction motor is developed. The controller equations are such
that the SPWM pulses are generated automatically for any number of levels. The effectiveness of the propose
method is evaluated in simulation. Matlab®/ Simulink is used to implement the control algorithm and simulate
the system.
Analysis of Multilevel Inverter using Bipolar and Unipolar Switching Schemes ...ijsrd.com
Cascaded H-bridge Multilevel Inverter (MLI) is most efficient topology for medium and high voltage DC-AC conversion, having less output harmonics and less commutation losses. Disadvantages are their complexity, more number of power devices, passive components and a complex control circuitry. Here a Cascaded Hybrid Multilevel Inverter is used to produce a three phase 9-level output voltages. Now a day inverter is also know as a DC-AC converter, is one of the most popular part of electrical device. This proposed inverter widely used in industries application such as speed control of induction motor. This thesis focus on three phase 9-level bipolar and unipolar switching inverter with characteristics like output voltage boosting ability and also we discus about the bipolar and unipolar switching scheme along with capacitor voltage control. The modified topology uses Cascaded H-bridge (CHB) with bidirectional and unidirectional switches producing boost up output voltage. Here a hybrid Pulse Width Modulation (PWM) technique is applied to control the power devices. This modulation technique uses a sine wave and a repeating wave, these waves are combined and a complete reference wave is generated. There is comparative study between CHB and modified topology between number of power devices used and Total Harmonic Distortions (THD). THD of modified topology is reduced and analyzed by FFT window. The results are observed by MATLAB/SIMULINK software.
This paper presents a MATLAB/SIMULINK model of two multi-level inverter topologies. Algorithms based on space vector modulation (SVM) technique are developed in order to conduct a comparative study on diode clamped five and seven level inverters. The scheme used to develop these control algorithms are based on symmetrical sequence because of the symmetry of the switching wave. Both topologies are simulated and analyzed using a squirrel cage induction motor. The results have showed that the best motor dynamic response with less harmonic distortion and torque fluctuations is obtained when seven-level inverter is employed.
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.
Three-Level DTC Based on Fuzzy Logic and Neural Network of Sensorless DSSM Us...IJPEDS-IAES
This paper presents a direct torque control is applied for salient-pole double star synchronous machine without mechanical speed and stator flux linkage sensors. The estimation is performed using the extended Kalman filter known by it is ability to process noisy discrete measurements. Two control approaches using fuzzy logic DTC, and neural network DTC are proposed and compared. The validity of the proposed controls scheme is verified by simulation tests of a double star synchronous machine. The stator flux, torque, and speed are determined and compared in the above techniques. Simulation results presented in this paper highlight the improvements produced by the proposed control method based on the extended Kalman filter under various operation conditions.
Multilevel inverters have become more popular over the years in electric high power application
with the promise of less disturbances and the possibility to function at lower switching frequencies than
ordinary two-level inverters. This paper presents information about several multilevel inverter topologies,
such as the Neutral-Point Clamped Inverter and the Cascaded Multi cell Inverter. These multilevel
inverters will also be compared with two-level inverters in simulations to investigate the advantages of
using multilevel inverters. Modulation strategies, component comparison and solutions to the multilevel
voltage source balancing problem will also be presented in this work.
Keywords — multilevel, Neutral-clamped, PWM.
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 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 Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
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.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
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.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...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.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
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UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4
M045037985
1. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
www.ijera.com 79|P a g e
Performance Analysis of BLDC MLI Drive
K.NagaVenkatesh1
, K.Dinesh2
, B.Harshad Chowdary3
, G.BalaVijayKumar4
1234
Dept. of EEE, KLUniversity, Vaddeswaram, Guntur. India
ABSTRACT
BLDC motors are used in wide range from very small motors used in hard disk drives to large motors used in
electric vehicles as it has more advantages over induction motors because it has permanent magnets in rotor
assembly generates steady magnetic field. The multilevel inverters are preferred over conventional inverters as
the voltage stress across each semiconductor switches is the voltage of one capacitor. The mli gives high
voltages with low harmonics and as no of levels increases output tends to sinusoidal. The most used multilevel
inverter configurations are diode clamped, flying capacitor, cascaded mli. In this paper five level diode clamped
mli, cascaded mli are simulated using MATLAB/SIMULINK. The performance characteristics of bldc motor is
observed when fed by each of these configurations.
Keywords: Brushless DC Motor, diode clamped, flying capacitor, cascaded, permanent magnets.
I. INTRODUCTION
Conventional DC motors have attractive
properties such as high efficiency and linear torque-
speed characteristics. The control of dc motors is also
simple and does not require complex hardware.
However, the main drawbacks of the DC motor is the
need of periodic maintenance. The brushes of the
mechanical commutator eventually wear out and
need to be replaced. The mechanical commutator has
other undesirable effects such as sparks, acoustic
noise and carbon particles coming from the brushes.
Brushless DC motor can in many cases replace
conventional DC motors. Despite the name, BLDC
motors are actually a type of permanent magnet
synchronous motors. They are driven by dc voltage
but current commutation is done by solid state
switches. The mechanical commutator is replaced by
electronic commutator. The commutation instants are
determined by rotor position and position of the rotor
is detected either by position sensors or by sensorless
techniques. BLDC motor have many advantages over
conventional dc motors:
High dynamic response
High efficiency
Higher speed operation
Higher speed range
Higher torque-weight ratio
The PMSMs are classified on the basis of
the wave shape of their induced emf, i.e., sinusoidal
and trapezoidal. The sinusoidal type is known as
PMSM and the trapezoidal type are called PM dc
brushless machine.
II. SIMULATION OF DIODE
CLAMPED MLI
Fig. 1 shows a five-level diode-clamped
converter in which the dc bus consists of four
capacitors C1,C2,C3,C4. Fordc-bus voltage Vdc, the
voltage across each capacitor is,Vdc/4 and each
device voltage stress will be limited to one
capacitorvoltage level Vdc/4 through clamping
diodes. To synthesize staircase voltage, the neutral
point n is considered as the output phase voltage
reference point. There are five switch combinations
to synthesize five level voltages across a and n.
1) For voltage level Van= Vdc/2, turn on
all upper switches S1-S4
2) For voltage level Van= Vdc/4, turn on
three upper switches S2-S4 and one
lower switch S1‟.
3) For voltage level Van= 0, turn on two
upper switches S3,S4 and two lower
switch S1‟ and S2‟
4) For voltage level Van= -Vdc/4, turn on
one upper switches S4 and three lower
switch S1‟-S3‟.
5) For voltage level Van= -Vdc/2, turn on
all lower switches S1‟-S4‟.
Four complementary switch pairs exist in
each phase. The complementary switch pair is
defined such that turning on one ofthe switches will
exclude the other from being turned on. The four
complementary pairs are (S1,S1‟ ), (S2,S2‟ ),
(S3,S3‟), and (S4,S4‟ ).
RESEARCH ARTICLE OPEN ACCESS
2. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
www.ijera.com 80|P a g e
Fig.1 Diode Clamped Inverter Leg
Switching Technique: sinusoidal pulse width
modulation technique is used for generating firing
pulses where reference wave is compared with carrier
wave. In this technique sinusoidal is taken as
reference wave and triangular wave as carrier signal.
For n level diode clamped inverter n-1 carrier waves
are compared with reference signal.
Fig.2Comparision of reference and carrier wave
3. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
www.ijera.com 81|P a g e
Fig.3 Three phase diode clamped Inverter
III. SIMULATION OF CASCADED H-
BRIDGE MLI
Simulation of MLI is carried out by using
MATLAB. Cascaded MLI consists of series H
Bridges, each H-Bridge consists of series H- Bridges,
each Bridge consists of four switches as shown in
fig.4
Fig.4 Single cascaded bridge
The output generated by each H-Bridge is of
three different levels i.e, +Vdc, 0, -Vdc by
connecting dc source to the ac output side by
different combinations of the four switches,
S1,S2,S3,S4. Turning on S1, S4 gives +Vdc. Turning
on S2,S3 yields –Vdc. Turning off all switches gives
0V. In the same manner output at each level is
obtained. The switching sequence for a single bridge
is as follows, the firing pulse for upper switches
S1,S3 has phase delay of 1800
. The lower switches
are compliments firing pulse given through NOT
gate. The same holds good for any no of bridges
connected either in single phase or three phase. Here
three phase cascaded MLI is simulated. For N-level
output no of bridges required per phase is given by
N=2n+1.
Where n= no of bridges
For 5 level require 2 bridges per phase.
4. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
www.ijera.com 82|P a g e
Fig.5 Three phase 5 level Cascaded MLI
Controlling the conducting angles at
different inverter levels can minimise the harmonic
distortion of the output voltage. As the no of levels
increases the output voltage tends to sinusoidal.
A. Switching Technique
Switching is implemented by sinusoidal
pulse width modulation. In pulse width modulation
the firing pulses required for semiconductor switches
is obtained by comparing reference wave with carrier
wave. In sinusoidal pulse width modulation technique
sinusoidal wave is taken reference wave and
triangular wave as carrier wave. The output of
inverter i.e. amplitude and frequency can be varied
by changing the reference wave amplitude and
carrier wave frequency respectively. Amplitude
modulation index is ratio of reference wave
amplitude to carrier wave amplitude ma = Vr / Vc.
The frequency modulation is defined as ratio of
carrier wave frequency to reference wave frequency
mf = fc /fr. In this paper the amplitude modulation is
taken as ma = 1 and the frequency modulation mf
=21. The pulses are generated as below in figure
Fig6. Pwm comparator
Here the MLI is three phase the firing pulses
are given with phase delay of 1200
to each leg. The
switches in a single leg are connected as shown in
fig.7
Fig7. Single leg of three phase cacaded mli
The switch S1 and S2 has phase delay of
1800
. Switch S1 and S5 has phase delay of 900
.
Switches S3,S4 are compliment for switch S1, S2
respectively and similarly S7,S8 are compliment to
switch S5,S6. In the same the other two legs are
5. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
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connected and switching is done in the similar
fashion.
IV. MODELLING OF BLDC MOTOR
The modelling is carried based on
assumptions that
a) the induced currents in the rotor due to stator
harmonics are neglected.
b) Iron and stray losses are also neglected.
The stator voltage equations in terms of
electrical constants are
𝑉𝑎𝑠
𝑉𝑏𝑠
𝑉𝑐𝑠
=
𝑅𝑠 0 0
0 𝑅𝑠 0
0 0 𝑅𝑠
𝑖𝑎𝑠
𝑖𝑏𝑠
𝑖𝑐𝑠
+ p
𝐿𝑎 − 𝐿𝑚 0 0
0 𝐿𝑏 − 𝐿𝑚 0
0 0 𝐿𝑐 − 𝐿𝑚
𝑖𝑎
𝑖𝑏
𝑖𝑐
+
𝑒𝑎𝑠
𝑒𝑏𝑠
𝑒𝑐𝑠
Where Rs - Rotor resistance
La, Lb, Lc – Self inductance of each phase windings
Lm – Mutual inductance
ias, ibs, ics – Currents in stator windings
eas, ebs, ecs – induced back emf‟s.
The electromagnetic induced emfs is given as
eas= fas(Θ)λpwm
ebs = fbs(Θ)λpwm
ecs = fcs(Θ)λpwm
where f(Θ) indicates that induced emf is dependent
on rotor position
The electromagnetic torque is given by
Te= [ easias +ebsibs + ecsics] 1/wm(N-m)
Speed of motor is obtained as
wm= ∫((Te -Tl- Bwm)/ J)
Where wm – rotor speed in mechanical rad/s
B – friction coefficient
J – Inertia of motor shaft
V. SIMULATION RESULTS
Fig8. Firing pulses for five level diode clamped inverter
Fig9. Three phase voltages of diode clamped inverter
6. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
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Fig10. Firing pulses for five level cascaded mli
Fig11. Three phase voltage waveforms of cascaded mli
Fig12. Stator currents
Fig13. Trapezoidal Back Emf
Fig14.Speed, Rotor position, Electromagnetic torque
7. K. Nagavenkatesh et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 4, Issue 5( Version 3), May 2014, pp.79-85
www.ijera.com 85|P a g e
Fig15. Trapezoidal Back Emf
Fig16. Stator Currents
Fig17. Speed, Rotor position, Electromagnetic torque
REFERENCES
[1] R. Krishnan, “Electric Motor Drives
Modelling, Analysis and Control”, Prentice
Hall, 2001.
[2] M.Rashid “Power electronics Handbook”,
Academic Press.
[3] John Wiley & Sons, Parker, R.J., “Advances
in Permanent Magnetism”, 1990.
[4] NedMohan, Undeland, Riobbins “Power
electronic converter, applications and
design” ,Wiley Student Edition.
[5] R. Krishnan, “Permanent Magnet
Synchronous and Brushless DC Motor
Drives”, CRC Press, 2010.
[6] „Multilevel Inverters: A Survey of
Topologies,Controls,andApplications‟José
Rodríguez, Jih-Sheng Lai, Fang
ZhengPeng,IEEE TRANSACTIONS ON
INDUSTRIAL ELECTRONICS, VOL. 49,
NO. 4, AUGUST 2002
[7] “Multilevel Inverter Topology Survey” M.S
Thesis Andreas Nordvall
[8] “Fundamentals of a New Diode Clamping
MultilevelInverter”XiaomingYuan,IvoBarbi,
IEEE TRANSACTIONS ON POWER
ELECTRONICS, VOL. 15, NO. 4, JULY
2000