This paper discusses controlling of cascaded H-bridge multi inverter with sinusoidal modulation based PWM methods. Multi-level inverters are used to reduce the THD in the output wave form without reduction in power output of inverter. Increase in voltage level in the output voltage of an inverter increases numbers of components to be used in inverter configuration. This in turn increases the switching loss. But results in good harmonic distortion and provide better quality fundamental wave. Carrier based PWM schemes are used for control of switching operation of multi-level inverters. Many kinds of PWM schemes are available to control inverter switches. In this paper uniploar carrier based PWM, bipolar carrier based PWM schemes are considered for generation of carrier signals. The carrier signals thus generated are compared with sinusoidal and third harmonic based sinusoidal modulating signals for production of switching Pulses. Switching schemes are designed for a 3 Phase 3, 5, 7, 9 and 11 Level inverters. The proposed switching schemes are applied to Cascaded H-Bridge Multi Level inverters. The circuit is simulated with MATLAB Simulink environment for verification of total harmonic distortion.
Study of THD in Different CHB MLIs Controlled With Unipolar and Bipolar Carri...Editor IJLRES
Multi-level inverters (MLIs) are gaining popularity due to their inherent advantages like better harmonic distortion, ability of producing higher magnitudes of AC voltages. As these converters uses many cascaded connection of many small units the switches used in devices are subjected to less voltage stresses. H-bridge based multilevel inverter can increase the number of output voltage levels by adding switch components and DC input voltage sources. If it employs seven switches and three DC sources, the number of output voltage levels becomes seven. Although its THD characteristics are improved, it needs output filter to meet general output voltage THD requirement, i.e., 5 % below. By adding PWM switching schemes to the operation of the prior H-bridge switches, it can synthesize more sinusoidal waveform. By this simple alteration in the switching scheme, it can improve the output voltage THD requirement. To verify the high performance of the proposed switching scheme, Unipolar, Bipolar, Third harmonic based Pulse width modulation schemes are considered for analysis and computer-aided simulations are conducted using MATLAB.
Design & Simulation Of 3-Phase, 15-Level Inverter with Reverse Voltage TopologyIJERA Editor
Multilevel inverters have been widely accepted for high-power high-voltage applications. Their performance is highly superior to that of conventional Seven-level inverters due to reduced harmonic distortion, lower electromagnetic interference, and higher dc link voltages. In this paper, a new topology with a reversing-voltage component is proposed to improve the multilevel performance. This topology requires fewer components compared to existing inverters (particularly in higher levels) and requires fewer carrier signals and gate drives. Therefore, thecomplexity is greatly reduced particularly for higher output voltage levels. The Proposed 15-level inverter is modelled and simulated in Matlab 2012a using Simulink and Sim Power Systems set tool boxes
Comparison of thd reduction for asymmetrical cascaded h bridge invertereSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
One of the preferred choices of electronic power conversion for high power applications are multilevel inverters topologies finding increased attention in industry. Cascaded H-Bridge multilevel inverter is one of these topologies reaching the higher output voltage, power level and higher reliability due to its modular topology. Level Shifted Carrier Pulse Width Modulation (LSCPWM) and Phase Shifted Carrier Pulse Width Modulation are used generally for switching cascaded H-bridge (CHB) multilevel inverters. This paper compares LSCPWM and PSCPWM in terms of total harmonics distortion (THD) and output voltage among inverter cells. Simulation for 21-level CHB inverter is carried out in MATLAB/SIMULINK and simulation results are presented.
Cascaded h bridge multilevel inverter in a three phase eleven leveleSAT Journals
Abstract
This paper essentially concentrates on the design and implementation of a unique topology for a three phase eleven level
cascaded H-bridge multilevel cluverter by employing different kinds of switching schemes. The basic purpose of this paper is to
enhance the number of voltage level at the output without addition of any complexity to power circuit.
The main advantages of this proposed topology is to scale down the THD and reducing electromagnetic interface EMI generation
and high voltage with very close to sine waveform. In this paper, severel kinds of carrier pulse width modulation techniques are
proposed as which scale down the total harmonic distortion and improve the out voltage from the proposed topology and POD
modulation techniques reduce the THD. A number of H-bridge arranged in cascaded to increase the voltage level with the
different switching schemes analyzed in this paper. It is observed that this new topology can be recommended to three phase
eleven level cascaded H-bridge inverter for the best and optimum performance over the conventional methods. This performance
in optimized in the eleven level of inverter.
Improving the fundamental waveforms and reducing the total harmonic distortion by using 60 IGBTs and switching is arranged
by a topology in cascaded manners.
The simulation model is produced by MATLAB2009 software version.
Key Words: Cascaded H-bridge multilevel inverter, different phase pulse width modulation, total harmonic
distortionTHD, EMI
Multilevel Inverters are getting popular and have become more attractive to researchers in the recent times for high power applications due to their better power quality and higher efficiency as compared to two level inverters. This research work presents a detailed comparative analysis of various multicarrier sinusoidal PWM schemes such as In Phase Disposition, Phase Opposition Disposition and Alternate Phase Opposite Disposition implemented on five level conventional and modified cascaded h-bridge inverters in MATLAB/SIMULINK software. Conventional five level topology uses eight switches and suffers from increased switching complexity while modified five level topology uses only five switches and is recommended to reduce switching complexity and switching losses. It also ensures less number of components, reduced size and overall cost of the system. The effect of modulation index (Ma) on the output harmonic contents in various PWM techniques is also analyzed.
Study of THD in Different CHB MLIs Controlled With Unipolar and Bipolar Carri...Editor IJLRES
Multi-level inverters (MLIs) are gaining popularity due to their inherent advantages like better harmonic distortion, ability of producing higher magnitudes of AC voltages. As these converters uses many cascaded connection of many small units the switches used in devices are subjected to less voltage stresses. H-bridge based multilevel inverter can increase the number of output voltage levels by adding switch components and DC input voltage sources. If it employs seven switches and three DC sources, the number of output voltage levels becomes seven. Although its THD characteristics are improved, it needs output filter to meet general output voltage THD requirement, i.e., 5 % below. By adding PWM switching schemes to the operation of the prior H-bridge switches, it can synthesize more sinusoidal waveform. By this simple alteration in the switching scheme, it can improve the output voltage THD requirement. To verify the high performance of the proposed switching scheme, Unipolar, Bipolar, Third harmonic based Pulse width modulation schemes are considered for analysis and computer-aided simulations are conducted using MATLAB.
Design & Simulation Of 3-Phase, 15-Level Inverter with Reverse Voltage TopologyIJERA Editor
Multilevel inverters have been widely accepted for high-power high-voltage applications. Their performance is highly superior to that of conventional Seven-level inverters due to reduced harmonic distortion, lower electromagnetic interference, and higher dc link voltages. In this paper, a new topology with a reversing-voltage component is proposed to improve the multilevel performance. This topology requires fewer components compared to existing inverters (particularly in higher levels) and requires fewer carrier signals and gate drives. Therefore, thecomplexity is greatly reduced particularly for higher output voltage levels. The Proposed 15-level inverter is modelled and simulated in Matlab 2012a using Simulink and Sim Power Systems set tool boxes
Comparison of thd reduction for asymmetrical cascaded h bridge invertereSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
One of the preferred choices of electronic power conversion for high power applications are multilevel inverters topologies finding increased attention in industry. Cascaded H-Bridge multilevel inverter is one of these topologies reaching the higher output voltage, power level and higher reliability due to its modular topology. Level Shifted Carrier Pulse Width Modulation (LSCPWM) and Phase Shifted Carrier Pulse Width Modulation are used generally for switching cascaded H-bridge (CHB) multilevel inverters. This paper compares LSCPWM and PSCPWM in terms of total harmonics distortion (THD) and output voltage among inverter cells. Simulation for 21-level CHB inverter is carried out in MATLAB/SIMULINK and simulation results are presented.
Cascaded h bridge multilevel inverter in a three phase eleven leveleSAT Journals
Abstract
This paper essentially concentrates on the design and implementation of a unique topology for a three phase eleven level
cascaded H-bridge multilevel cluverter by employing different kinds of switching schemes. The basic purpose of this paper is to
enhance the number of voltage level at the output without addition of any complexity to power circuit.
The main advantages of this proposed topology is to scale down the THD and reducing electromagnetic interface EMI generation
and high voltage with very close to sine waveform. In this paper, severel kinds of carrier pulse width modulation techniques are
proposed as which scale down the total harmonic distortion and improve the out voltage from the proposed topology and POD
modulation techniques reduce the THD. A number of H-bridge arranged in cascaded to increase the voltage level with the
different switching schemes analyzed in this paper. It is observed that this new topology can be recommended to three phase
eleven level cascaded H-bridge inverter for the best and optimum performance over the conventional methods. This performance
in optimized in the eleven level of inverter.
Improving the fundamental waveforms and reducing the total harmonic distortion by using 60 IGBTs and switching is arranged
by a topology in cascaded manners.
The simulation model is produced by MATLAB2009 software version.
Key Words: Cascaded H-bridge multilevel inverter, different phase pulse width modulation, total harmonic
distortionTHD, EMI
Multilevel Inverters are getting popular and have become more attractive to researchers in the recent times for high power applications due to their better power quality and higher efficiency as compared to two level inverters. This research work presents a detailed comparative analysis of various multicarrier sinusoidal PWM schemes such as In Phase Disposition, Phase Opposition Disposition and Alternate Phase Opposite Disposition implemented on five level conventional and modified cascaded h-bridge inverters in MATLAB/SIMULINK software. Conventional five level topology uses eight switches and suffers from increased switching complexity while modified five level topology uses only five switches and is recommended to reduce switching complexity and switching losses. It also ensures less number of components, reduced size and overall cost of the system. The effect of modulation index (Ma) on the output harmonic contents in various PWM techniques is also analyzed.
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.
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.
A New Configuration of Asymmetric Multilevel Converter to Maximize the Number...IJMTST Journal
The multilevel converters are increasingly becoming popular because of its high power applications. This research paper describes about the new structure that can produce increased number of output voltage waveform using a single source and reduced number of power electronic components. In designing a multilevel converter, the power electronic switches play a very imperative role as it describes the installation area, cost, configuration complexity and may more things that play a significant role while designing. The prime function of multilevel converter is to abolish total harmonic distortion and to incorporate desired ac voltage from several separate dc sources. Each level consists of H-Bridge converter units. High efficiency, high voltage capability, lower switching losses are its prime advantages. A multilevel power converter structure can be introduced as an alternative in medium voltage and high power situations. This structure not only achieves high power ratings but also empower the use of renewable energy sources. It finds its basic application in adjustable speed drives, Static Compensator (STATCOM).
IEEE 2012 Projects,academic projects in .net,academic projects in java,b tech mini projects,btech projects,electrical projects for students,electronic engineering final year project,electronic engineering final year projects,electronic final year project,electronics students projects,embedded in chennai,embedded projects chennai,engineering final project,engineering final projects,engineering projects in chennai,engineering projects in java,final year embedded projects,final year engineering projects,final year engineering projects chennai,final year engineering projects in chennai,final year ieee projects chennai,final year it projects,final year project chennai,final year project in chennai,final year project in electronics,final year project of electronics,final year projects for it,final year projects for mca,final year projects in .net,final year projects in chennai,final year projects in electronics,final year projects in embedded systems,final year projects in it,final year projects on embedded systems,final year student project,final year student projects,ieee embedded projects,ieee projects,ieee projects chennai,ieee projects for mca,ieee projects in .net,ieee projects in chennai,ieee projects in java,ieee projects in vlsi,ieee projects on embedded systems,ieee projects titles,ieee students projects,mca academic projects,mca final project,mca final year project,mca final year project in chennai,mca projects,mca projects chennai,mca projects titles,project in vlsi,project of mca,projects for mca,projects in vlsi,student project chennai,student projects in java,vlsi in chennai,year projects,Real Time IEEE Projects,Live Projects,Embedded Live Projects,Power Electronics Projects,Power System Projects,ME Projects,M.Tech Projects,VLSI Final Year projects,Embedded final Year Projects,Real Time Embedded Projects,Real Time Software Projects,Live Java Projects,Dot net Projects in Chennai,.Net Projects,B.tech projects,BE Projects,Real Time Project MBA, Real Time Project BE,Project Work BE,Real Time Project MCA,Real Time Project BE Electronic,Computer Software Training Embedded Systems, Real Time Project,Computer Project Work,Real Time Project IT,Embedded Training,Real Time Project Me,Project Work Ieee Based,Real Time Project B Tech,Project Work MCA,Project Work Computer Science,Project Work M E,Engineering Project Consultants,Real Time Project MSC,Real Time Project M Tech,Real Time Project Bio Medical,Project Consultants For Electronic,Project Work B Tech,Real Time Project BE Electrical,Real Time Project Dot Net,Real Time Project BCA,Project Work M Phil,Real Time Project M Phil,Project Work Embedded System,Real Time Project Embedded System,Project Work M Tech,Project Engineering,Real Time Project Java,Real Time Project PHD,Project Work IT,Real Time Project Networking,Real Time Project BSc,Real Time Project Matlab,Computer Software Training Embedded Network,Project Work Java,Real Time Project Vlsi,Real Time Project Animation,Project Work HTML,Real
SIMULATION OF CASCADED H- BRIDGE MULTILEVEL INVERTER USING PD, POD, APOD TECH...ecij
Multilevel inverter (MLI) can achieve medium voltage high power efficiency inverters in industrial
application. It can generate stepped waveform by reducing harmonic distortion with increase in the
number of voltage level; a full bridge is known as H-bridge inverter because it shows alphabet ‘H’. In this
paper, Multicarrier PWM topologies and there Modulation schemes are discussed. Level Shifted [LS]
Scheme is applied to the Cascade H-bridge multilevel inverter and the complete analysis of THD to 9 levels
is done.
H bridge multilevel inverter organized krunal gamit
: In this paper mainly focused on the design and implementation of new topology in a single phase five
level cascaded H-bridge multilevel inverter by using only a five switches and two DC power source. The main
objective of this paper is to increase number of levels with a low number of switches and sources at the output
without adding any complexity to the power circuit. The main merit of the new topology is to reduce the lower
total harmonic distortion, lower electromagnetic interference generation and high output voltage. In this paper,
various carrier pulse width modulation techniques are proposed, which can minimize the total harmonic
distortion and enhances the output voltages from proposed work of five level inverter. The various switching
topologies of single-phase five level cascaded H-bridge multilevel inverters have been analyzed in this paper. It
is justified that the new topology can be recommended to single phase five level Cascaded H-bridge inverter for
better performance in comparison with conventional method. The simulation is done by Mat Lab 8.0 version
software.
Multilevel DC Link Inverter with Reduced Switches and BatteriesIJPEDS-IAES
Multilevel inverters are the best solution for medium and high voltage power electronic drives. Because of its unique characteristic of synthesizing sinusoidal voltage with less harmonic contents using several DC sources. In a three phase multilevel inverter, each phase of a cascaded H-bridge inverter requires ‘n’ DC sources to obtain 2n + 1 output voltage levels. One particular disadvantage is that, it increases number of power semiconductor switches. To overcome this disadvantage a multilevel DC link inverter (MLDCLI) with reduced number of switches and batteries is proposed.
Cascaded h bridge multilevel inverter for induction motor driveseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Harmonic Minimization In Multilevel Inverters By Using PSOIDES Editor
Harmonic Elimination in a multilevel inverters is
an optimization problem which is solved by applying particle
swarm optimization (PSO) technique. The derived equation
for the computation of total harmonic distortion (THD) of the
output voltage of the multilevel inverter is used as the objective
function in PSO algorithm. The objective function used is to
reduce the THD of the multilevel inverter and obtain the
corresponding switching angles with the elimination of
possible lower order harmonics. In this paper a pseudo code
based algorithm is proposed to deal with inequality constraints
which will helps in accelerating the optimization process. The
proposed method is applied for seven level cascade inverter to
eliminate the 5th and 7th order harmonics to reduce the total
harmonic distortion .This proposed PSO algorithm is effective
in reducing the total harmonic distortion corresponding the
range of modulation index. The simulation results shows that
the proposed PSO method is indeed capable of obtaining
higher quality of solutions to eliminate 5th and 7th order
harmonics and to reduce the total harmonic distortion of 7-
level cascade inverter
A Single Phase Eleven Level Cascaded H-Bridge Multilevel Inverter for Photovo...IJMER
Abstract: A Cascaded H-Bridge Multilevel Inverter is a power electronic converter built to synthesize a desired ac voltage
from several levels of dc voltages with better harmonic spectrum. Such inverters are suitable for high voltage and high
power applications and have been an important development in recent years. This paper presents the performance of a
eleven level cascaded H-Bridge multilevel inverter topology with multicarrier pulse width modulation technique for
photovoltaic cell. This inverter is capable of producing eleven levels of output voltage from the dc supply voltage. This
topology magnifies the fundamental output voltage with reduction in total harmonic distortion . The output is drawn near the
sine wave because of more levels. It can also be easily extended to an m-level inverter. The performance of the proposed
PWM strategy in terms of output voltage and THD is shown using MATLAB/Simulink.
Keywords: Multilevel inverter, Cascaded H-Bridge multilevel inverter, Multicarrier pulse width modulation, PV cell, Total
harmonic distortion.
The main objective of this work is to model and simulate DC to DC Boost Converter using Single Phase Matrix Converter (SPMC) topology using MATLAB/Simulink (MLS). The output voltage is controlled by using Pulse Width Modulation (PWM) technique. Four pairs of Insulated Gate Bipolar Transistor (IGBT) is used as the switching device where for each pair, it is located in parallel and opposite direction. Safe commutation technique is performed in preventing voltage spike at the output. Through the simulation, at switching frequency of 25kHz, the model is able to step up its input voltage about two times larger and all of the results achieved a good agreement with the principle of four quadrant operation. It is also realized that without the implementation of safe commutation technique, spikes were generated and the model is unable to boost its input voltage. All of the selected results from the analysis which includes variation of quadrant, switching frequency, duty cycle and resistive load are presented in this paper.
Reuse of Lathe Waste Steel Scrap in Concrete PavementsIJERA Editor
These project works assess on the study of the workability and mechanical strength properties of the concrete reinforced with industrialized waste fibers or the recycled fibers. In each lathe industries wastes are available in form of steel scraps are yield by the lathe machines in process of finishing of different machines parts and dumping of these wastes in the barren soil contaminating the soil and ground water that builds an unhealthy environment. Now a day’s these steel scraps as a waste products used by innovative construction industry and also in transportation and highway industry. In addition to get sustainable progress and environmental remuneration, lathe scrap as worn-recycle fibers with concrete are likely to be used. When the steel scrap reinforced in concrete it acquire a term; fiber reinforced concrete and steel fibers in concrete defined as steel fiber reinforced concrete (SFRC).Different experimental studies are done to identify about fresh and hardened concrete properties of steel scrap fiber reinforced concrete (SSFRC) and their mechanical properties are found to be increase due to the addition of steel scrap in concrete i.e. compressive strength, flexural strength, impact strength, fatigue strength and split tensile strength were increased but up to 0.5-2% scrap content . When compared with usual concrete to SSFRC, flexural strength increases by 40% and considerable increases in tensile and compressive strength. These steel scrap also aid to improve the shrinkage reduction, cracking resistance i.e. preventing crack propagation and modulus of elasticity. The workability of fresh SSFRC are carried out by using slump test but it restricted to less scrap contents. This work focuses on the enhancement of structural strength and improvement in fatigue life of concrete pavements by reuse of scrap steel in concrete. These concrete roads with SSFRC promises an appreciably eminent design life, offer superior serviceability and minimize crack growth and corrosion. The pioneer idea of this work is the reuse of waste lathe scrap as recycled steel fibers, which provides more cost-effective and eco-friendly sustainable SFRC PAVEMENTS.
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.
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.
A New Configuration of Asymmetric Multilevel Converter to Maximize the Number...IJMTST Journal
The multilevel converters are increasingly becoming popular because of its high power applications. This research paper describes about the new structure that can produce increased number of output voltage waveform using a single source and reduced number of power electronic components. In designing a multilevel converter, the power electronic switches play a very imperative role as it describes the installation area, cost, configuration complexity and may more things that play a significant role while designing. The prime function of multilevel converter is to abolish total harmonic distortion and to incorporate desired ac voltage from several separate dc sources. Each level consists of H-Bridge converter units. High efficiency, high voltage capability, lower switching losses are its prime advantages. A multilevel power converter structure can be introduced as an alternative in medium voltage and high power situations. This structure not only achieves high power ratings but also empower the use of renewable energy sources. It finds its basic application in adjustable speed drives, Static Compensator (STATCOM).
IEEE 2012 Projects,academic projects in .net,academic projects in java,b tech mini projects,btech projects,electrical projects for students,electronic engineering final year project,electronic engineering final year projects,electronic final year project,electronics students projects,embedded in chennai,embedded projects chennai,engineering final project,engineering final projects,engineering projects in chennai,engineering projects in java,final year embedded projects,final year engineering projects,final year engineering projects chennai,final year engineering projects in chennai,final year ieee projects chennai,final year it projects,final year project chennai,final year project in chennai,final year project in electronics,final year project of electronics,final year projects for it,final year projects for mca,final year projects in .net,final year projects in chennai,final year projects in electronics,final year projects in embedded systems,final year projects in it,final year projects on embedded systems,final year student project,final year student projects,ieee embedded projects,ieee projects,ieee projects chennai,ieee projects for mca,ieee projects in .net,ieee projects in chennai,ieee projects in java,ieee projects in vlsi,ieee projects on embedded systems,ieee projects titles,ieee students projects,mca academic projects,mca final project,mca final year project,mca final year project in chennai,mca projects,mca projects chennai,mca projects titles,project in vlsi,project of mca,projects for mca,projects in vlsi,student project chennai,student projects in java,vlsi in chennai,year projects,Real Time IEEE Projects,Live Projects,Embedded Live Projects,Power Electronics Projects,Power System Projects,ME Projects,M.Tech Projects,VLSI Final Year projects,Embedded final Year Projects,Real Time Embedded Projects,Real Time Software Projects,Live Java Projects,Dot net Projects in Chennai,.Net Projects,B.tech projects,BE Projects,Real Time Project MBA, Real Time Project BE,Project Work BE,Real Time Project MCA,Real Time Project BE Electronic,Computer Software Training Embedded Systems, Real Time Project,Computer Project Work,Real Time Project IT,Embedded Training,Real Time Project Me,Project Work Ieee Based,Real Time Project B Tech,Project Work MCA,Project Work Computer Science,Project Work M E,Engineering Project Consultants,Real Time Project MSC,Real Time Project M Tech,Real Time Project Bio Medical,Project Consultants For Electronic,Project Work B Tech,Real Time Project BE Electrical,Real Time Project Dot Net,Real Time Project BCA,Project Work M Phil,Real Time Project M Phil,Project Work Embedded System,Real Time Project Embedded System,Project Work M Tech,Project Engineering,Real Time Project Java,Real Time Project PHD,Project Work IT,Real Time Project Networking,Real Time Project BSc,Real Time Project Matlab,Computer Software Training Embedded Network,Project Work Java,Real Time Project Vlsi,Real Time Project Animation,Project Work HTML,Real
SIMULATION OF CASCADED H- BRIDGE MULTILEVEL INVERTER USING PD, POD, APOD TECH...ecij
Multilevel inverter (MLI) can achieve medium voltage high power efficiency inverters in industrial
application. It can generate stepped waveform by reducing harmonic distortion with increase in the
number of voltage level; a full bridge is known as H-bridge inverter because it shows alphabet ‘H’. In this
paper, Multicarrier PWM topologies and there Modulation schemes are discussed. Level Shifted [LS]
Scheme is applied to the Cascade H-bridge multilevel inverter and the complete analysis of THD to 9 levels
is done.
H bridge multilevel inverter organized krunal gamit
: In this paper mainly focused on the design and implementation of new topology in a single phase five
level cascaded H-bridge multilevel inverter by using only a five switches and two DC power source. The main
objective of this paper is to increase number of levels with a low number of switches and sources at the output
without adding any complexity to the power circuit. The main merit of the new topology is to reduce the lower
total harmonic distortion, lower electromagnetic interference generation and high output voltage. In this paper,
various carrier pulse width modulation techniques are proposed, which can minimize the total harmonic
distortion and enhances the output voltages from proposed work of five level inverter. The various switching
topologies of single-phase five level cascaded H-bridge multilevel inverters have been analyzed in this paper. It
is justified that the new topology can be recommended to single phase five level Cascaded H-bridge inverter for
better performance in comparison with conventional method. The simulation is done by Mat Lab 8.0 version
software.
Multilevel DC Link Inverter with Reduced Switches and BatteriesIJPEDS-IAES
Multilevel inverters are the best solution for medium and high voltage power electronic drives. Because of its unique characteristic of synthesizing sinusoidal voltage with less harmonic contents using several DC sources. In a three phase multilevel inverter, each phase of a cascaded H-bridge inverter requires ‘n’ DC sources to obtain 2n + 1 output voltage levels. One particular disadvantage is that, it increases number of power semiconductor switches. To overcome this disadvantage a multilevel DC link inverter (MLDCLI) with reduced number of switches and batteries is proposed.
Cascaded h bridge multilevel inverter for induction motor driveseSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Harmonic Minimization In Multilevel Inverters By Using PSOIDES Editor
Harmonic Elimination in a multilevel inverters is
an optimization problem which is solved by applying particle
swarm optimization (PSO) technique. The derived equation
for the computation of total harmonic distortion (THD) of the
output voltage of the multilevel inverter is used as the objective
function in PSO algorithm. The objective function used is to
reduce the THD of the multilevel inverter and obtain the
corresponding switching angles with the elimination of
possible lower order harmonics. In this paper a pseudo code
based algorithm is proposed to deal with inequality constraints
which will helps in accelerating the optimization process. The
proposed method is applied for seven level cascade inverter to
eliminate the 5th and 7th order harmonics to reduce the total
harmonic distortion .This proposed PSO algorithm is effective
in reducing the total harmonic distortion corresponding the
range of modulation index. The simulation results shows that
the proposed PSO method is indeed capable of obtaining
higher quality of solutions to eliminate 5th and 7th order
harmonics and to reduce the total harmonic distortion of 7-
level cascade inverter
A Single Phase Eleven Level Cascaded H-Bridge Multilevel Inverter for Photovo...IJMER
Abstract: A Cascaded H-Bridge Multilevel Inverter is a power electronic converter built to synthesize a desired ac voltage
from several levels of dc voltages with better harmonic spectrum. Such inverters are suitable for high voltage and high
power applications and have been an important development in recent years. This paper presents the performance of a
eleven level cascaded H-Bridge multilevel inverter topology with multicarrier pulse width modulation technique for
photovoltaic cell. This inverter is capable of producing eleven levels of output voltage from the dc supply voltage. This
topology magnifies the fundamental output voltage with reduction in total harmonic distortion . The output is drawn near the
sine wave because of more levels. It can also be easily extended to an m-level inverter. The performance of the proposed
PWM strategy in terms of output voltage and THD is shown using MATLAB/Simulink.
Keywords: Multilevel inverter, Cascaded H-Bridge multilevel inverter, Multicarrier pulse width modulation, PV cell, Total
harmonic distortion.
The main objective of this work is to model and simulate DC to DC Boost Converter using Single Phase Matrix Converter (SPMC) topology using MATLAB/Simulink (MLS). The output voltage is controlled by using Pulse Width Modulation (PWM) technique. Four pairs of Insulated Gate Bipolar Transistor (IGBT) is used as the switching device where for each pair, it is located in parallel and opposite direction. Safe commutation technique is performed in preventing voltage spike at the output. Through the simulation, at switching frequency of 25kHz, the model is able to step up its input voltage about two times larger and all of the results achieved a good agreement with the principle of four quadrant operation. It is also realized that without the implementation of safe commutation technique, spikes were generated and the model is unable to boost its input voltage. All of the selected results from the analysis which includes variation of quadrant, switching frequency, duty cycle and resistive load are presented in this paper.
Reuse of Lathe Waste Steel Scrap in Concrete PavementsIJERA Editor
These project works assess on the study of the workability and mechanical strength properties of the concrete reinforced with industrialized waste fibers or the recycled fibers. In each lathe industries wastes are available in form of steel scraps are yield by the lathe machines in process of finishing of different machines parts and dumping of these wastes in the barren soil contaminating the soil and ground water that builds an unhealthy environment. Now a day’s these steel scraps as a waste products used by innovative construction industry and also in transportation and highway industry. In addition to get sustainable progress and environmental remuneration, lathe scrap as worn-recycle fibers with concrete are likely to be used. When the steel scrap reinforced in concrete it acquire a term; fiber reinforced concrete and steel fibers in concrete defined as steel fiber reinforced concrete (SFRC).Different experimental studies are done to identify about fresh and hardened concrete properties of steel scrap fiber reinforced concrete (SSFRC) and their mechanical properties are found to be increase due to the addition of steel scrap in concrete i.e. compressive strength, flexural strength, impact strength, fatigue strength and split tensile strength were increased but up to 0.5-2% scrap content . When compared with usual concrete to SSFRC, flexural strength increases by 40% and considerable increases in tensile and compressive strength. These steel scrap also aid to improve the shrinkage reduction, cracking resistance i.e. preventing crack propagation and modulus of elasticity. The workability of fresh SSFRC are carried out by using slump test but it restricted to less scrap contents. This work focuses on the enhancement of structural strength and improvement in fatigue life of concrete pavements by reuse of scrap steel in concrete. These concrete roads with SSFRC promises an appreciably eminent design life, offer superior serviceability and minimize crack growth and corrosion. The pioneer idea of this work is the reuse of waste lathe scrap as recycled steel fibers, which provides more cost-effective and eco-friendly sustainable SFRC PAVEMENTS.
Image Enhancement and Restoration by Image InpaintingIJERA Editor
Inpainting is the process of reconstructing lost or deteriorated part of images based on the background information. i. e .it fills the missing or damaged region in an image utilizing spatial information of its neighboring region. Inpainting algorithm have numerous applications. It is helpfully used for restoration of old films and object removal in digital photographs. The main goal of the algorithm is to modify the damaged region in an image in such a way that the inpainted region is undetectable to the ordinary observers who are not familiar with the original image. This proposed work presents image inpainting process for image enhancement and restoration by using structural, texture and exemplar techniques. This paper presents efficient algorithm that combines the advantages of these two approaches. We first note that exemplar-based texture synthesis contains the essential process required to replicate both texture and structure; the success of structure propagation, however, is highly dependent on the order in which the filling proceeds. We propose a best-first algorithm in which the confidence in the synthesized pixel values is propagated in a manner similar to the propagation of information in inpainting. The actual color values are computed using exemplar-based synthesis. Computational efficiency is achieved by a blockbased sampling process.
Compressive Strength of Ready Mix Concrete Using Soft Computing TechniquesIJERA Editor
Ready mixed concrete (RMC) is an essential material in contemporary construction and engineering projects. Compressive strength of concrete is a major and perhaps the most important mechanical property, which is usually measured after a standard curing of 28 days. In this research work, 28-day compressive strength of Ready Mix Concrete has been estimated by using feed forward back propagation neural network, Fuzzy Logic and Adaptive Neuro Fuzzy Inference System (ANFIS) modeling. The data for the ready mixed concretes (RMC) were collected from RMC batching plant. Various models has been has been developed for different input scenarios. The compressive strength was modeled as a function of five variables, the effects of each parameter on networks were studied for Artificial Neural Network (ANN), Fuzzy Logic and ANFIS models.
Review: Biometric and GSM Security for LockersIJERA Editor
In this review paper we will develop biometric (finger or face) and GSM technology for bank lockers. Because in this system bank will collect the biometric data of each person for accessing the lockers because in this system only authenticated person recover the money, documents from the lockers. So the biometric and GSM security has more advantages then other system. Because biometric is stored individual identity of a person and GSM is used for sending and receiving message.
Secure and Reliable Data Transmission in Generalized E-MailIJERA Editor
Email is a basic service for computer users, while email malware poses critical security threats. The technique of email-borne malware will be highly effective. Email malware focuses on modeling the propagation dynamics which is a fundamental technique for developing countermeasures to reduce email malware’s spreading speed and prevalence. Modern email malware exhibits two new features, reinjection and self-start. Reinjection is an infected user sends out malware copies whenever this user visits the malicious hyperlinks or attachments. Self-start refers to the behavior that malware starts to spread whenever compromised computers restart or certain files are visited. For address this problem, to derive a novel difference equation based analytical model by introducing a new concept of virtual dirty user. Propose a new analytical model to enhanced OLSR protocol which is a trust based technique to secure the OLSR nodes against the attack. The proposed solution called EOLSR is an enhancement of the basic OLSR routing protocol, which will be able to detect the presence of malicious nodes in the network.
3D printing device for numerical control machine and wood depositionIJERA Editor
The paper presents the development of a new sustainable approach in additive manufacturing adapted on a Numerical Control (NC) machining. Wood has several advantages that are transferable to various derivatives allowing the introduction of sustainable material into the product lifecycle. The application involves the integration of wood pulp into rapid prototyping solutions. Wood is the main material studied for its ecological aspect. The primary goal was to create reconstituted wood objects through a rapid manufacturing. Additive manufacturing technology is most commonly used for modeling, prototyping, tooling through an exclusive machine or 3D printer. An overall review and an analysis of technologies show that the additive manufacturing presents some little independent solutions [9] [12]. The problem studied especially the additive manufacturing limits to produce an ecological product with materials from biomass. The study developed a 3d printing head as solution for shaping wood pulp or powder materials. Some technological problematic require enslavement to the NC controller, the programming building of model, and the realization of wood pulp. This work also presents a wood pulping process characterized by adding wood flour and starch. A machine implementation and some application examples used for its development are presented.
E-Commerce in Developing Countries: A Case Study on the Factors Affecting E-c...IJERA Editor
The rapid development and increasing spread of e-commerce technology utilization have led to inspiring more Libyan companies to inaugurate web sites on the internet, in order to make much benefit from the services render thereon, to increase the mutual exchanges between these companies and other states, in such a manner as to save time and cost and stock as well as to create a competitive advantage. However, there are some obstacles which impede making benefit from the advantages and opportunities the e-commerce attempts to make.The paper aimed to determine the most important obstacles that are facing the implementation of commerce, that is to say, technological, Legal, human and organizational obstacles in the Libyan companies. This is on one hand, however, the paper aimed, on the other, to know whether there is a correlation that is statistically significant between such obstacles as to affect the implementation of e-commerce and the level of utilization of the same by industrial and commercial companies in Libya.Findings have shown, on the whole, that there is a high positive correlation of statistical significance at (α = 0.01) and (α =0.05) levels between the obstacles which affect commerce and the level of e-commerce utilization, this is pursuant to the points of view of the managers of the companies in question.The paper has reached a number of findings which have shown the fact that there are many obstacles which may impede the growth of commerce in Libya. This is in addition to other significant findings the paper has reached. However, the paper has suggested a number of recommendations to help develop e-commerce in Libya.This paper also contributes substantially to enrich the applied research studies on commerce and its applied activities and provides in details the related debate on the similarities and proposals for future studies.
Suomen käsityön museolla pidettiin 14.1.2015 asiakasraatitilaisuus, jonka lopuksi mietittiin käsityöaiheisten Wikipedia-artikkelien parannusta Kokeilutonni-projektin kautta. Tilaisuuden alussa Johanna Janhonen piti parin tunnin alustuksen siitä, mikä Wikipedia on, miten se on syntynyt, ketkä ovat tyypillisiä muokkaajia ja mikä heitä motivoi sekä siitä, millaisia käytössääntöjä Wikipediassa on.
A Survey and Comparative Study on Video Watermarking Techniques with Referenc...IJERA Editor
During the last few years’ mobile devices like smart phone and tablet witnessed a random growth in terms of hardware and software. The increased growth of apps, sharing data, videos, images through internet need security and intellectual property right. Developing a watermarking technique for data protection and authentication on shared data in mobile internet within the limited memory and significant battery consumption is one of the current challenging fields. In this paper we have performed a survey on available video watermarking techniques and a feasibility study on video watermarking techniques for mobile devices. Also the comparative study on features of watermarking with different video watermarking algorithm is performed.
Combination Of The Non-Destructive Methods For Evaluating The Quality Of Conc...IJERA Editor
The study is aboutthe use and comparison of three non-destructive methods (dynamic auscultation, sclerometric auscultation and auscultation by RADAR (Radio Detecting and Ranging) to monitor and assess the quality of concrete. Samples of reinforced concrete panels, dimensions 200x100x30 cm of concrete dosed at 350 kg/m3 with diverse E/C ratio were achieved, conserved in the laboratory and subjected to various non-destructive test. The synthesis of the results obtained by auscultation RADAR shows a decrease in the propagation speed of the electromagnetic wave with an increase of the E/C ratio and a decrease in resistance of concrete values measured and confirmed by other non-destructive techniques (sclerometric and dynamic auscultations). This shows that more the dielectric constant is high, morethe concrete resistance is reduced, and conversely the opposite.
Performance Analysis of Higher Order Cascaded H-Bridge Multilevel Invertersijtsrd
Cascade H-Bridge Multilevel Inverters are very popular and have many applications in electric utilities and for industrial drives. When these inverters are used for industrial drives directly, the Total Harmonic Distortion (THD) in the output voltage of inverters is very significant as the performance of drive depends very much on the quality of voltage applied to drive. A Multilevel Inverter in high power ratings improves the performance of the system by reducing Harmonics. This paper presents the simulation of single phase nine level and eleven level inverters. Detailed analysis of these inverters has been carried out and compared with different loads. PWM control strategy is applied to the switches at appropriate conducting angles with suitable delays. These different level inverters are realized by cascade H-Bridge in MATLAB/SIMULINK. The inverters with a large number of steps can generate high quality voltage waveforms. The THD depends on the switching angles for different units of Multilevel Inverters. Ms. Komal Shende | Dr. HariKumar Naidu | Prof. Vaishali Pawade"Performance Analysis of Higher Order Cascaded H-Bridge Multilevel Inverters" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14456.pdf http://www.ijtsrd.com/engineering/electrical-engineering/14456/performance-analysis-of-higher-order-cascaded-h-bridge-multilevel-inverters/ms-komal-shende
Multi Carrier based Multilevel Inverter with Minimal Harmonic DistortionIJPEDS-IAES
This paper presents performance features of Asymmetric Cascaded
Multilevel inverter. Multilevel inverters are commonly modulated by using
multicarrier pulse width modulation (MCPWM) techniques such as phaseshifted
multicarrier modulation and level-shifted multicarrier modulation.
Amongst these, level-shifted multicarrier modulation technique produces the
best harmonic performance. This work studies about multilevel inverter with
unequal DC sources using level shifting MCPWM technique. The
Performances indices like Total Harmonic Distortion (THD), number of
switches and DC Sources are considered. A procedure to achieve an
appropriate level shifting is also presented is this paper.
Simulation based approach for Fixing Optimum number of Stages for a MMCIJERA Editor
Modular multi level converters (MMC) are gaining importance day by day due to their inherent advantages of
bidirectional capability, reduced switching loss. MMCs have become one of the best choices for electric vehicles
(EV) and storage based electric vehicles as these converters have the ability of conduction in both the directions
with bidirectional switches. One of the major issues of concern of an EV is that the storage of energy, as these
vehicles battery storage with large capacity and these batteries required to be charged continuously. This feature
of EV makes usage of MMCs as an attractive solution. The output available across a MMC is stepped sine wave.
As the number of steps increases nearness of output voltage with a sine wave is increased, but this is not true.
The authors feel that it is not true in case of a Sinusoidal Pulse Width Modulated Inverter. As the number of
levels are increased the Total Harmonic Distortion (THD) in a voltage waveform decreases to a minimum value
and then increases. MMC configuration proposed in [1] taken into consideration and simulation studies are
conducted using Sinusoidal Pulse Width Modulation control scheme with the help of MATLAB / SIMULINK.
The THD levels in the phase voltages and load currents are presented. With the help of simulation studies the
optimum number of an inverter are identified.
This paper deals with the design of cascaded 11 level H- bridge inverter. It includes a comparison between the 11 level H-bridge and T-bridge multilevel inverter. The cascaded inverter of higher level is a very effective and practical solution for reduction of total harmonic distortion (THD).These cascaded multilevel inverter can be used for higher voltage applications with more stability. As the level is increased the output waveform becomes more sinusoidal in nature. The inverter is designed using multicarrier sinusoidal pulse width modulation technique for generating triggering pulses for the semiconductor switches used in the device. Through this paper it will be proved that a cascaded multilevel H-bridge topology has higher efficiency than a T-bridge inverter, as whichever source input voltage is provided since input is equal to the output voltage. In T-bridge inverter, the output obtained is half of the applied input, so efficiency is just half as compared to H-bridge. The output waveform is distorted and has higher THD. The simulation is performed using MATLAB /Simulink 2013 software.
Single Phase Thirteen Level Inverter using BI Directional Switches and reduce...Editor IJMTER
Renewable energies have advantages of zero fuel cost and reduced environmental
impacts. This paper proposes an Asymmetrical Thirteen level H-Bridge inverter circuit. Two inputs
from solar PV panels are given to the converter and maximum power is extracted by using maximum
power point tracking method. Integrated converter is DC to DC Boost converter. The output is given
to H- inverter which converts dc to ac and the thirteen level output voltage is applied to the load.
Operational analysis and simulation results are given for the proposed circuit.
Five Level Hybrid Cascaded Multilevel Inverter Harmonic Reduced in PWM Switch...ijsrd.com
The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as a inverter. This paper describes a harmonics reduced in a hybrid cascaded multilevel inverter circuit with pulse width modulation (PWM) scheme. These scheme pulse width modulations in modified method are uses reduce switching device. These methods are a conventional inverter and hybrid inverter combine form. This topology used the combined form of a new five level hybrid cascaded multilevel inverter. The multilevel carrier based pulse width modulation methods are used in this topology five level output voltage wave forms is shown in FFT window MATLABE/SIMULINK is used to simulate the inverter circuit operation and control signals.
Implementation of Cascaded H-bridge MULTI-LEVEL INVERTEREditor IJMTER
The classical two level inverter produce output with levels either Vdc or -Vdc. The output
voltage waveform of ideal inverter should be sinusoidal but the waveform of conventional inverters
is non-sinusoidal and contains certain harmonics. Large capacitor is normally connected across the
DC voltage source and such a capacitor is costly and demands space. In order to overcome these
drawbacks Multi level inverters are introduced. The great advantage of this kind of inverter is the
minimum harmonic distortion obtained. Power electronics is the applications of power
semiconductor devices for the control and conversion of electric power such that these devices
operate as switches. An inverter is an electrical device that converts DC voltage to AC voltage; the
resulting AC can be at any required frequency. Multi-level inverters are nothing but the modification
of basic bridge inverters [1]. The multilevel inverter collectively converts the several levels of dc
voltage to a desired ac voltage. The unique structure of multilevel inverters allows them to reach
nearer to sinusoidal i.e., with low harmonics. In this project the work is done on five & nine level
multilevel inverter but the multilevel can be done up to any level and how many levels we increase
that much precise sinusoidal supply we can get i.e., we can reduce that many harmonics from the
supply. Simulation work is done using the MATLAB software
Harmonic Analysis of Seven and Nine Level Cascade Multilevel Inverter using M...IAES-IJPEDS
The use of multilevel inverters has become popular in recent years for high- power applications. Multilevel Inverters are power converter systems composed by an array of power semiconductor sources that when properly connected and controlled can generate a multistep voltage waveform with variable and controllable frequency, phase and amplitude. This study deals with the comparison of a 7-level inverter with a 9-level inverter system; the voltage source inverters (VSI) are modelled and simulated using MATLAB Simulink and the results are presented. The test results verify the effectiveness of the proposed strategy in terms of computational efficiency as well as the capability of the inverter to produce very low distorted voltage with low-switching losses. This research aims to extend the knowledge about the performance of different clamped multilevel inverter through harmonic analysis. Simulations results validate up to the mark performance of the mentioned topologies.
COMPREHENSIVE ANALYSIS AND SIMULATION OF MULTILEVEL POWER CONVERTERS TO CURTA...ecij
Present day industrial applications require higher power apparatus for power conversion. At medium voltage grid, to connect only one power semiconductor switch directly is a not practically successful concept. To overcome this multilevel power converter structure has been introduced and studied as an alternative in high power and medium voltage applications. Renewable energy sources like photovoltaic, wind, fuel cells can be conveniently interfaced to a multilevel converter system for high power applications. In this study it is discussed in detail for different levels of the multilevel converters using pulse width
modulation technique (PWM) the harmonics contents decreases gradually. The simulated results are presented and compared thereafter. Total harmonic distortion decreases as the number of levels increased are tabulated accordingly. All the simulation results are carried out under MATLAB/Simulink environment.
COMPREHENSIVE ANALYSIS AND SIMULATION OF MULTILEVEL POWER CONVERTERS TO CURTA...ecij
Present day industrial applications require higher power apparatus for power conversion. At medium
voltage grid, to connect only one power semiconductor switch directly is a not practically successful
concept. To overcome this multilevel power converter structure has been introduced and studied as an
alternative in high power and medium voltage applications. Renewable energy sources like photovoltaic,
wind, fuel cells can be conveniently interfaced to a multilevel converter system for high power applications.
In this study it is discussed in detail for different levels of the multilevel converters using pulse width
modulation technique (PWM) the harmonics contents decreases gradually. The simulated results are
presented and compared thereafter. Total harmonic distortion decreases as the number of levels increased
are tabulated accordingly. All the simulation results are carried out under MATLAB/Simulink environment.
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.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
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.
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.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
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.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
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
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
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.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
A Comparison Analysis of Unipolar and Bipolar Switching modulated Cascade H-Bridge Multi Level Inverters
1. Manikanth Addala et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 1), January 2015, pp.116-120
www.ijera.com 116 | P a g e
A Comparison Analysis of Unipolar and Bipolar Switching
modulated Cascade H-Bridge Multi Level Inverters
Manikanth Addala*, KRK Pandu**, V.Satyanarayna***
*(PG Scholar, Department of EEE, Ramachandra College of Engineering, Vatluru(V), Eluru, West Godavari
(Dist ), Andhra Pradesh)
** (Assistant Professor, Department of EEE, Ramachandra College of Engineering, Vatluru(V), Eluru, West
Godavari (Dist ), Andhra Pradesh)
***( Associate Processor, Department of EEE, Ramachandra College of Engineering, Vatluru(V), Eluru, West
Godavari (Dist ), Andhra Pradesh)
ABSTRACT
This paper discusses controlling of cascaded H-bridge multi inverter with sinusoidal modulation based PWM
methods. Multi-level inverters are used to reduce the THD in the output wave form without reduction in power
output of inverter. Increase in voltage level in the output voltage of an inverter increases numbers of components
to be used in inverter configuration. This in turn increases the switching loss. But results in good harmonic
distortion and provide better quality fundamental wave. Carrier based PWM schemes are used for control of
switching operation of multi-level inverters. Many kinds of PWM schemes are available to control inverter
switches. In this paper uniploar carrier based PWM, bipolar carrier based PWM schemes are considered for
generation of carrier signals. The carrier signals thus generated are compared with sinusoidal and third harmonic
based sinusoidal modulating signals for production of switching Pulses. Switching schemes are designed for a 3
Phase 3, 5, 7, 9 and 11 Level inverters. The proposed switching schemes are applied to Cascaded H-Bridge Multi
Level inverters. The circuit is simulated with MATLAB Simulink environment for verification of total harmonic
distortion.
Keywords - Bipolar carrier signals, Cascaded H-bridge multi-level inverter, MATLAB Simulink, sinusoidal
pulse width modulation, third harmonic based sinusoidal pulse width modulation, unipolar carrier signals.
I. Introduction
Recently multilevel inverters have become more
attractive to researchers and industrial companies due
to fast developing of high power devices and related
control techniques (Khajehoddin et al., 2007). The
recent advancement in power electronics has initiated
to improve the level of inverter to cater to the need of
medium voltage high power applications without
transformer (KjaerefoJ.,2005).
The three common topologies for multilevel
inverters are as follows: Diode clamped (neutral
clamped), capacitor clamped (flying capacitors),
cascaded H-bndge inverter but the one considered in
this study is the cascaded H-bridge multilevel
inverter. These converter topologies can generate
high-quality voltage waveforms with power
semiconductor switches operating at a frequency near
the fundamental. It significantly reduces the
harmonics problem with reduced voltage stress
across the switch (Kjaerefa/., 2005). The cascaded H-
bridge multilevel inverter topology has many
advantages not only in terms of its simple structure
but also allows the use of a single dc source as the
first dc source with the remaining (n-1) dc sources
being capacitors (Seyezhai and Mathur, 2010). The
voltage regulation of the capacitor is the key issue
and this is achieved by the switching state
redundancy of the proposed modulation strategy.
This scheme also provides the ability to produce
higher voltages at higher speeds with low switching
losses and high conversion efficiency. The cascaded
multilevel control method is very easy when
compared to other multilevel inverter because it
doesn't require any clamping diode and flying
capacitor (Mafhurm and Seyezhai, 2008).
The diode-clamped inverter (neutral-point
clamped), capacitor-clamped (flying capacitor)
requiring only one dc source and the cascaded bridge
inverter requiring separate dc sources. The latter
characteristic which is a drawback when a single dc
source is available becomes a very attractive feature
in the case of PV Systems because solar cells can be
assembled in a number of separate generators. In this
way, they satisfy the requirements of the CHB-MLI,
obtaining additional advantages such as a possible
elimination of the dc/dc booster (needed in order to
adapt voltage levels), a significant reduction of the
power drops caused by sun darkening (usually, it
influences only a fraction of the overall PV field) and
therefore, a potential increase of efficiency and
reliability (Aghdam et al, 2008).
Performance of the multilevel inverter (such as
THD) is mainly decided by the modulation strategies.
RESEARCH ARTICLE OPEN ACCESS
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For the cascaded multilevel inverter there are several
well known pulse width modulation strategies such as
space vector pwm, sinusoidal pwm, selective
harmonics elimination and multicarrier pwm (Tolbert
et al, 1999). Compared to the conventional method,
the proposed method is subjected to a new
modulation scheme adopting the multicarrier pulse
width modulation concept which uses multiple
modulating signals with a single carrier reduces the
total harmonic distortion (Rodriguez etal., 2002).
This research study deals with harmonic analysis
in 5, 7, 9 and 11 levels by considering up to 23rd
harmonics of single phase cascaded H-bridge
multilevel inverter employing multicarrier pulse
width modulation technique for grid connected
photovoltaic system. The effect of cascaded h-bridge
multilevel inverter topology and change in PV input
parameters irradiation and temperature on the
performance parameters has been analyzed.
II. Cascaded H-Bridge Multi-level
Inverter
Multi-level inverters have emerged recently as
very important role in the area of high power and
medium voltage applications. The multi-level
inverters are, (i) diode clamped multi-level inverters
(ii)flying capacitor multi-level inverter(iii)cascaded
H-bridge multi-level inverter, the cascaded H-bridge
multi-level inverter have some disadvantages
compared to other topologies, because it have the full
H-bridges that improving the level of the voltages.
Same numbers of components are sufficient for each
level. In sinusoidal pulse width modulation, sine
wave is compared with the carrier wave, the pulses
are produced. Then that produces pulses given to the
multi-level inverters, in SVPWM modulating waves
are compared with the carrier wave that produced
pulses also given to the multi-level inverters. Carrier
based schemes are used for multi-level inverters.
Number of carriers are depends on the levels of the
multi-level inverters. For five level inverts four
carriers are used.
Fig 1: Cascaded H Bridge based Multilevel Inverter
In cascaded H-bridge multi-level inverter uses
cascaded full bridge inverters with separate DC
sources, number of devices used in the circuit are
less. Using of H- bridges multilevel inverter increases
the voltage level of the inverter. The fig 1 shows
cascaded H-bridge based multi-level inverter. This
requires less no of components, same amount of
components are sufficient in every voltage level. For
different voltage level the operation of switching
sequence will be following in the table1, when the
battery has 2Vdc voltage. For zero voltage the S1,
S3, S5, S7 switches get ON. For Vdc Voltage S2 S6
S8 S2 switches will be ON. For 2Vdc voltage S1,
S6, S5, S2 switches will be ON, For -2Vdc voltage
S3,S8,S7,S4 switches will be ON, For -Vdc voltage
S3,S7,S5,S4 switches will be ON.
Fig 2: Output of a Seven Level Inverter.
III. Sinusoidal Pulse Width Modulation
In the sinusoidal pulse width modulation, the
reference wave is the sine wave. That is compared
with the carrier triangular Wave, the pulses are
produced. That is given to the inverter. .The sine
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wave is greater than the carrier wave the top switches
are ON. Otherwise the bottom switches are ON.
Fig 3: Unipolar switching sequence generation.
Fig 4: Unipolar Switching signals.
Fig 5: Bipolar switching sequence generation
In this paper Bipolar and Unipolar switching
schemes with sinusoidal and third harmonic based
sinusoidal switching schemes are used for generation
of switching sequences for inverter switching. In
bipolar switching scheme carrier signal have both
positive and negative polarities whereas in unipolar
switching scheme carrier signal have only one
polarity that is either in positive or in negative.
Different carrier and modulating signals are shown in
fig 3 to 10.
Fig 7: Unipolar switching sequence With 3rd
Harmonic modulating signal.
Fig 8: Unipolar 3rd Harmonic Signals.
Fig 9: Bipolar switching sequence With 3rd
Harmonic
modulating signal.
Fig 10: Bipolar 3rd Harmonic Signals
IV. Model Simulation & Results
Different control schemes proposed in chapter III
are applied to a 3-Level, 5-Level, 7-Level, 9-Level
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and 11-inverters for identification of switching
scheme that gives minimum harmonic distortion.
MATLAB simulations are done for different indexes.
Observations made on the different converter circuits
are presented in table – I and Table – II for
modulation index vales 0.9 and 1.0 respectively.
Fig 11: Voltage of 11 level 3 Phase CHB across load
terminals with Bipolar SPWM switching When
mIndex = 1
Name of
Control
Technique
Level of
Inverter
output
voltage
% of
Output
Voltage
%
THD
Unipolar
Carrier
Based
SPWM
3 90.11 63.33
5 90.11 63.33
7 90.11 63.33
9 90.11 63.33
11 90.11 63.33
Bipolar
Carrier
Based
SPWM
3 90.07 64.11
5 90.04 33.32
7 90.05 22.41
9 90.06 16.68
11 89.99 13.21
Unipolar
Carried
Based
Third
Harmonic
SPWM
3 103.6 54.78
5 103.6 54.78
7 103.6 54.78
9 103.6 54.78
11 103.6 54.78
Bipolar
Carrier
Based
Third
Harmonic
SPWM
3 103.6 56.71
5 103.5 37.76
7 103.5 31.13
9 103.5 27.9
11 103.6 25.96
Table I: Observation table for mIndex = 0.9
Name of
Control
Technique
Level of
Inverter
output
voltage
% of
Output
Voltage
%
THD
Unipolar
Carrier
Based
SPWM
3 100.1 51.11
5 100.1 51.11
7 100.1 51.11
9 100.1 51.11
11 100.1 51.11
Bipolar
Carrier
Based
SPWM
3 99.99 52.1
5 99.98 26.94
7 100 18.08
9 99.98 13.75
11 99.98 11.08
Unipolar
Carried
Based Third
Harmonic
SPWM
3 114.5 41.73
5 114.5 41.73
7 114.5 41.73
9 114.5 41.73
11 114.5 41.73
Bipolar
Carrier
Based Third
Harmonic
SPWM
3 114.7 43.9
5 114.7 31.21
7 114.8 27.62
9 114.7 26.1
11 114.8 25.19
Table – II: Observation table for mIndex = 1
V. Conclusion
It is observed that irrespective of the level of the
circuit Bipolar Sinusoidal Pulse Width Modulation
Scheme gives rise to least magnitude of Total
Harmonic Distortion when compared with the other
proposed switching schemes. Unipolar switching
scheme with Fundamental and third harmonic based
modulating signals give more total harmonic
distortion. Whereas bipolar swathing scheme with
third harmonic modulating signal gives 14% higher
output voltage compared to the output voltage
magnitude of other switching schemes but total
harmonic distortion is more compared to Bipolar
Sinusoidal Pulse Width Modulation Scheme.
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