This document describes the design and simulation of a 15-level three-phase inverter with a reverse voltage topology. A new topology is proposed that requires fewer components than existing inverters, particularly at higher voltage levels. This reduces complexity. The 15-level inverter is modeled and simulated in MATLAB. Simulation results show the output voltage waveform, total harmonic distortion within reasonable limits, and voltage and current waveforms. The proposed inverter provides high voltage output with reduced harmonic distortion and lower component count.
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
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.
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.
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
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
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.
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.
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
DESIGN OF A MULTIFUNCTIONAL FLYBACK DC-DC CONVERTER WITH CURRENT CONTROLIAEME Publication
This paper proposes a set of design techniques to build a DC-DC converter for the interconnection of different sources of renewable energy with storage elements and flexible load profiles. This type of multifunctional DC-DC converter is essential to provide the dispatch of energy generation to storage connected to the DC bus or allow energy exchange with the AC network, with different decision modes as a function of the state of charge of batteries, with the forecast of the consumption of a house with renewable production. This work emphasizes the application of a method to design switched mode flyback converters with current control capabilities on the output side.
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.
Performance and Analysis of Hybrid Multilevel Inverter fed Induction Motor Drivernvsubbarao koppineni
This paper presents the Five level inverter with single DC source which is used to generate a five level output with two bridges and six switches and performance of three phase induction motor is analyzed when connected to PV array For this two identical dc sources of 50V each for two bridges in five levels using Multi level inverter and five level output is obtained by using a single DC source of 100V with six switches. A virtual DC source (charged capacitor acts as virtual DC source) is used for getting the output. The same technique is implemented for three-phase circuit i.e. by using single DC source. An asynchronous motor (three-phase) is connected as load and its performance characteristics are analyzed. And further the DC source is replaced by a renewable resource such as solar panels, fuel cell etc. and DC voltage is obtained. Performance characteristics of three-phase asynchronous motor are analyzed with PV array connected. The method can be easily extended to an m-level inverter.
Ieee Power Electronics Ieee Project Titles, 2009 2010 Ncct Final Year Projectsncct
Final Year Projects, IEEE Projects, Final Year Projects in Chennai, Final Year IEEE Projects, final year projects, college projects, student projects, java projects, asp.net projects, software projects, software ieee projects, ieee 2009 projects, 2009 ieee projects, embedded projects, final year software projects, final year embedded projects, ieee embedded projects, matlab projects, microcontroller projects, vlsi projects, dsp projects, free projects, project review, project report, project presentation, free source code, free project report, Final Year Projects, IEEE Projects, Final Year Projects in Chennai, Final Year IEEE Projects, final year projects, college projects, student projects, java projects, asp.net projects, software projects, software ieee projects, ieee 2009 projects, 2009 ieee projects, embedded projects, final year software projects, final year embedded projects, ieee embedded projects, matlab projects
A Comparison Analysis of Unipolar and Bipolar Switching modulated Cascade H-B...IJERA Editor
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.
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.
Asymmetrical Cascaded Multi Level Inverter using Control Freedom Pulse width ...IAES-IJPEDS
In this paper, the suggested topologies are gained by cascading a full bridge inverter with dissimilar DC sources. This topology has several new patterns adopting the fixed switching frequency, multicarrier control freedom degree with mixture conceptions are established and simulated for the preferred three-phase cascaded multilevel inverter. In outstanding switching arrangement terminations, there are convinced degrees of freedom to produce the nine level AC output voltages with terminated switching positions for producing altered output voltages. These investigations focus on asymmetrical cascaded multilevel inverter engaging with carrier overlapping pulse width modulation (PWM) topologies. These topologies offer less amount of harmonics present in the output voltage and superior root mean square (RMS) values of the output voltages associated with the traditional sinusoidal pulse width modulation. This research studies carries with it MATLAB/SIMULINK based simulation and experimental results obtained using appropriated prototype to prove the validity of the proposed concept.
Hybrid topology of asymmetric cascaded multilevel inverter with renewable ene...Asoka Technologies
This paper presents a binary topology of Multimodule level inverters produce a staircase output voltage from renewable DC voltage sources. The MLI (Multi Level Inverter) Requires many number of semiconductor switches is main drawback of multilevel inverters. The MLI can be classified as two method, one is symmetric and another asymmetric converters. In symmetrical multilevel inverter can apply same voltage level to all cascaded circuit, in asymmetric multilevel inverters can be vary input source voltage at each cascaded H-bridge by using binary algorithm. In this paper, a discrete binary topology for multilevel converters is proposed using cascaded sub-multilevel Cells. This sub-multilevel converter can produce sixty three levels of voltage from five discrete DC source. The Total Harmonic Distortions (THD) is minimized by discrete binary topology. The working operation and performance of the proposed multilevel inverters studies has been verified by simulation of using SIMULINK / MA TLAB results.
In this paper the multicarrier pulse width modulation (MCPWM) with multi value DC voltage source multilevel inverter is presented. These MLI’s are suitable in high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum. Seven level inverter is simulated using MATLAB/Simulink. The use of Photovoltaic Cell as a DC source for the multilevel Inverter is proposed here.
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).
Fuzzy based control of Transformer less Coupled inductor based DC-DC converterIJERA Editor
Most of the industrial applications use any one of the basic DC-DC converter configurations namely buck,
boost, buck–boost, and Cuk converters. These converters are non-isolating converters. Buck-boost converters
use inductors for storing energy from the source and release the same to load or output. This results in high
stress across magnetic components. This drawback restricts usage of buck-boost converters to low power
applications. Flyback converters popularly have known as buck-boost converters uses transformers for
achieving wide range of step down and step up voltages. Coupled inductor based converters or tapped inductor
based converters are used for achieving wide input – wide output conversion ratios. Coherent transition between
step-down and step-up modes is achieved by a proper control scheme. This paper proposes fuzzy logic based
closed loop control scheme for control of converter switches. Theoretical derivations of control parameters with
their membership values, mamdani based rules for development of fuzzy rules and simulation results of a
coupled inductor based DC-DC converter using MATLAB / SIMULINK are concluded.
ACADEMIC MATLAB SIMULATION 2013/14/15 PROJECTS FOR
• ELECTRICAL AND ELECTRONICs ENGINEERING[EEE]
• POWER ELECTRONICs AND DRIVES[PED]
• POWER SYSTEMS[PS]….
We Can also Develop Your Own Ideas and Your IEEE Papers With Extension also…
We also write papers for your projects and give guidance for paper publishing.
For Further Details Call Us @
0-9347143789/9949240245
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Determination Of Iron, Cobalt, Chromium And Copper Metals In Commercially Ava...IJERA Editor
Khat (Catha sedulous foresk) is a plant that grows in a certain area of east Africa and Arab peninsula. A large number of peoples in Ethiopia chew chat leaves because of its pleasurable and stimulating effects. In the present study the levels of selected trace metals (Cu, Co, Cr and Fe) in two different kinds of Khat sampled from different khat shops in Arba Minch were analyzed. The discern weights of oven dried khat samples were digested by wet digestion using 3ml of HNO3, 1ml of HClO4 and 1ml of H2O2 by setting the temperature first to 60oc for 30 min and then increased to 210oc for the next 2h and 30 min. The content of minerals in the digests was analyzed using flame atomic spectrometry. The concentration of the trace metals in dry weight (μg/g) were obtained in the khat samples Co 5μg/g, Cu 4μg/g, Fe 2.9μg/g and Cr 3μg/g. Among the metal content analyzed Co was the most abundant one followed by Cu and Cr whereas Fe was less abundant metal in khat sample that grown in Arba Minch area.
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.
DESIGN OF A MULTIFUNCTIONAL FLYBACK DC-DC CONVERTER WITH CURRENT CONTROLIAEME Publication
This paper proposes a set of design techniques to build a DC-DC converter for the interconnection of different sources of renewable energy with storage elements and flexible load profiles. This type of multifunctional DC-DC converter is essential to provide the dispatch of energy generation to storage connected to the DC bus or allow energy exchange with the AC network, with different decision modes as a function of the state of charge of batteries, with the forecast of the consumption of a house with renewable production. This work emphasizes the application of a method to design switched mode flyback converters with current control capabilities on the output side.
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.
Performance and Analysis of Hybrid Multilevel Inverter fed Induction Motor Drivernvsubbarao koppineni
This paper presents the Five level inverter with single DC source which is used to generate a five level output with two bridges and six switches and performance of three phase induction motor is analyzed when connected to PV array For this two identical dc sources of 50V each for two bridges in five levels using Multi level inverter and five level output is obtained by using a single DC source of 100V with six switches. A virtual DC source (charged capacitor acts as virtual DC source) is used for getting the output. The same technique is implemented for three-phase circuit i.e. by using single DC source. An asynchronous motor (three-phase) is connected as load and its performance characteristics are analyzed. And further the DC source is replaced by a renewable resource such as solar panels, fuel cell etc. and DC voltage is obtained. Performance characteristics of three-phase asynchronous motor are analyzed with PV array connected. The method can be easily extended to an m-level inverter.
Ieee Power Electronics Ieee Project Titles, 2009 2010 Ncct Final Year Projectsncct
Final Year Projects, IEEE Projects, Final Year Projects in Chennai, Final Year IEEE Projects, final year projects, college projects, student projects, java projects, asp.net projects, software projects, software ieee projects, ieee 2009 projects, 2009 ieee projects, embedded projects, final year software projects, final year embedded projects, ieee embedded projects, matlab projects, microcontroller projects, vlsi projects, dsp projects, free projects, project review, project report, project presentation, free source code, free project report, Final Year Projects, IEEE Projects, Final Year Projects in Chennai, Final Year IEEE Projects, final year projects, college projects, student projects, java projects, asp.net projects, software projects, software ieee projects, ieee 2009 projects, 2009 ieee projects, embedded projects, final year software projects, final year embedded projects, ieee embedded projects, matlab projects
A Comparison Analysis of Unipolar and Bipolar Switching modulated Cascade H-B...IJERA Editor
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.
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.
Asymmetrical Cascaded Multi Level Inverter using Control Freedom Pulse width ...IAES-IJPEDS
In this paper, the suggested topologies are gained by cascading a full bridge inverter with dissimilar DC sources. This topology has several new patterns adopting the fixed switching frequency, multicarrier control freedom degree with mixture conceptions are established and simulated for the preferred three-phase cascaded multilevel inverter. In outstanding switching arrangement terminations, there are convinced degrees of freedom to produce the nine level AC output voltages with terminated switching positions for producing altered output voltages. These investigations focus on asymmetrical cascaded multilevel inverter engaging with carrier overlapping pulse width modulation (PWM) topologies. These topologies offer less amount of harmonics present in the output voltage and superior root mean square (RMS) values of the output voltages associated with the traditional sinusoidal pulse width modulation. This research studies carries with it MATLAB/SIMULINK based simulation and experimental results obtained using appropriated prototype to prove the validity of the proposed concept.
Hybrid topology of asymmetric cascaded multilevel inverter with renewable ene...Asoka Technologies
This paper presents a binary topology of Multimodule level inverters produce a staircase output voltage from renewable DC voltage sources. The MLI (Multi Level Inverter) Requires many number of semiconductor switches is main drawback of multilevel inverters. The MLI can be classified as two method, one is symmetric and another asymmetric converters. In symmetrical multilevel inverter can apply same voltage level to all cascaded circuit, in asymmetric multilevel inverters can be vary input source voltage at each cascaded H-bridge by using binary algorithm. In this paper, a discrete binary topology for multilevel converters is proposed using cascaded sub-multilevel Cells. This sub-multilevel converter can produce sixty three levels of voltage from five discrete DC source. The Total Harmonic Distortions (THD) is minimized by discrete binary topology. The working operation and performance of the proposed multilevel inverters studies has been verified by simulation of using SIMULINK / MA TLAB results.
In this paper the multicarrier pulse width modulation (MCPWM) with multi value DC voltage source multilevel inverter is presented. These MLI’s are suitable in high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum. Seven level inverter is simulated using MATLAB/Simulink. The use of Photovoltaic Cell as a DC source for the multilevel Inverter is proposed here.
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).
Fuzzy based control of Transformer less Coupled inductor based DC-DC converterIJERA Editor
Most of the industrial applications use any one of the basic DC-DC converter configurations namely buck,
boost, buck–boost, and Cuk converters. These converters are non-isolating converters. Buck-boost converters
use inductors for storing energy from the source and release the same to load or output. This results in high
stress across magnetic components. This drawback restricts usage of buck-boost converters to low power
applications. Flyback converters popularly have known as buck-boost converters uses transformers for
achieving wide range of step down and step up voltages. Coupled inductor based converters or tapped inductor
based converters are used for achieving wide input – wide output conversion ratios. Coherent transition between
step-down and step-up modes is achieved by a proper control scheme. This paper proposes fuzzy logic based
closed loop control scheme for control of converter switches. Theoretical derivations of control parameters with
their membership values, mamdani based rules for development of fuzzy rules and simulation results of a
coupled inductor based DC-DC converter using MATLAB / SIMULINK are concluded.
ACADEMIC MATLAB SIMULATION 2013/14/15 PROJECTS FOR
• ELECTRICAL AND ELECTRONICs ENGINEERING[EEE]
• POWER ELECTRONICs AND DRIVES[PED]
• POWER SYSTEMS[PS]….
We Can also Develop Your Own Ideas and Your IEEE Papers With Extension also…
We also write papers for your projects and give guidance for paper publishing.
For Further Details Call Us @
0-9347143789/9949240245
Visit us at: www.asokatechnologies.in
For Abstracts of IEEE papers and For Any Queries
Mail us : asokatechnologies@gmail.com
Determination Of Iron, Cobalt, Chromium And Copper Metals In Commercially Ava...IJERA Editor
Khat (Catha sedulous foresk) is a plant that grows in a certain area of east Africa and Arab peninsula. A large number of peoples in Ethiopia chew chat leaves because of its pleasurable and stimulating effects. In the present study the levels of selected trace metals (Cu, Co, Cr and Fe) in two different kinds of Khat sampled from different khat shops in Arba Minch were analyzed. The discern weights of oven dried khat samples were digested by wet digestion using 3ml of HNO3, 1ml of HClO4 and 1ml of H2O2 by setting the temperature first to 60oc for 30 min and then increased to 210oc for the next 2h and 30 min. The content of minerals in the digests was analyzed using flame atomic spectrometry. The concentration of the trace metals in dry weight (μg/g) were obtained in the khat samples Co 5μg/g, Cu 4μg/g, Fe 2.9μg/g and Cr 3μg/g. Among the metal content analyzed Co was the most abundant one followed by Cu and Cr whereas Fe was less abundant metal in khat sample that grown in Arba Minch area.
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.
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.
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.
Simulation of Height of Stack Pile using SCREEN3 module for Particulate Matte...IJERA Editor
This study is regarding the air pollution in selected areas near to port (beside stack yards of port) interested in particulate matter pollution. In this study, the amount of air pollution due to particulates is analyzed. The amount of air pollution is estimated using SCREEN 3 Methodology. In this study, SCREEN 3 methodology is a predefined software tool which can be used to estimate particulate matter pollution levels at different source release heights, terrain heights and at particular receptor height. The results obtained are reported and finally concluded that to avoid the pollution in the selected area, it is better to construct a periphery along the sides of stack yard (source of pollution).
“Evaluation of Corrosion Properties of Retrogression and Reaged Al 7075 alloy...IJERA Editor
The metal matrix composites offer a spectrum of advantages that are important for their selection and use as structural materials. A few such advantages are high strength, high elastic modulus, high toughness and impact resistance, low sensitivity to changes in temperature or thermal shock, high surface durability, low sensitivity to surface flaws, high electrical and thermal conductivity, minimum exposure to the potential problem of moisture absorption resulting in environmental degradation and improved machinability with conventional metal working equipment. The aim of the present study is to investigate the corrosion properties of Silicon Carbide particles (SiCp) reinforced Aluminum matrix composite after retrogression and re-aging heat treatment. Aluminum 7075 alloy with 0%, 5%, 10% and 15% SiCp were studied.
Shortest Tree Routing With Security In Wireless Sensor NetworksIJERA Editor
We propose STR to resolve the main reasons of overall network performance degradation of ZTR, which are the detour path problem and the traffic concentration problem. Second, we prove that the 1-hop neighbor nodes used by STR improve the routing path efficiency and alleviate the traffic load concentrated on tree links in ZTR. Third, we analyze the performance of ZTR, STR, and AODV by differentiating the network conditions such as network density, ZigBee network constraints, traffic types, and the network traffic. For modification security purpose we are also encrypting the data packets during transmission. So that the intermediate nodes are not able to view the data during transmission. For Encryption process, we are using RC4 Algorithm. Short cut tree routing is used for minimizing the routing path from source to destination.
Un workshop per imparare a guardare, a comporre una fotografia e gestire lo sguardo di chi osserva le nostre fotografie con l'obiettivo di produrre immagini "significative" perché vedere non è guardare e mostrare è qualcosa di diverso ancora, ovvero:
• guardare v. tr. e intr. [dal germ. wardōn] (come intr., aus. avere). –
1. Dirigere gli occhi, fissare lo sguardo su qualche oggetto (non include necessariamente l’idea del vedere, in quanto si può guardare senza vedere, così come si può vedere qualche cosa senza rivolgervi intenzionalmente o coscientemente lo sguardo…
• vedére v. tr. [lat. vĭdēre]
… indicando, oltre la sensazione visiva, anche l’intenzione, la volontà di avere tale sensazione (con sign. analogo a guardare)…
… Con riferimento a scritti, esaminare, leggere…
…avere discernimento, capire
• mostrare v. tr. [lat. monstrare, der. di monstrum: v. mostro2] (io móstro, ecc.). –
1. a. Far vedere, presentare ad altri perché veda, esamini, osservi…
An Intelligent Human Computer Communication with Real Time Hand Gesture for M...IJERA Editor
This paper may be helpful in making the living of handicapped people easy which will be helpful for the handicapped people to drive their wheelchair through finger operation. It is an opportunity to be a handicapped as independent. System comprises of integration of finger operation using digital image processing and embedded technology .According to the World Health Organization (WHO), between the 7 and 10% of the population worldwide suffer from some physical disability. In Latin-America the physically disabled are estimated in 55 million people, which represent the 9% of its total population. This census indicates that the most common disability is motor, followed by blindness, deafness, intellectual and language. All alone, the motor-disabled achieve 20 million in Latin-America and there is an anticipated continued growth due to increasing aging, longevity and accident related injuries. Wheelchairs make up a significant portion of the mobility assistive devices in use for those. Since the 1930s, the design concept of a wheelchair has been the same: a main frame, two large rear wheels and two small front wheels called casters. This basic design has been used to develop many of today’ wheelchairs by applying slight design modifications to produce lighter, more durable and more comfortable wheelchairs for people who use them on a daily basis. Finally it means that is affordable and beneficial by the people.
Effect of Ambient Temperature and Composition on Liquid Droplet CombustionIJERA Editor
An unsteady, spherically symmetric, single component, diffusion controlled gas phase droplet combustion
model was developed assuming infinite kinetics and no radiation effects. Finite difference technique was used to
solve time dependent equations of energy and species. Adiabatic flame temperature which is important for
calculating thermodynamic properties was calculated by employing a detailed method. Effects of ambient
temperature and composition on important combustion parameters like adiabatic flame temperature, droplet
mass burning rate, burning constant and droplet lifetime were obtained. Results indicated that flame
temperature, burning constant and mass burning rate increased with an increase in ambient temperature while
the droplet life time decreased. The present gas phase code was used in conjunction with the Olikara and
Borman code for obtaining concentration of important species. Emission results showed that for a 100m nheptane
droplet burning in standard atmosphere, an increase in ambient temperature led to an increase in NO
and CO concentrations and a decrease in CO2 and H2O concentrations. Extinction diameter for a 3000m nheptane
droplet burning in oxygen-helium environment was determined. Also, effects of ambient temperature
and composition were obtained on droplet lifetime and mass burning rate as a function of initial droplet
diameter. The present gas phase model is simple but realistic and can be incorporated in spray combustion
codes.
Construction Time Analysis For Different Steps In Drill-And-Blast Method Of H...IJERA Editor
One of the most important factors influencing the decision whether and how a tunnel is to be built are the estimated time and costs of construction. This study is based on construction time analysis for different steps in drill-and-blast method of hydro power tunnel excavation in working phase of 6.256,00 meters of tunnels which have different diameters varying from 4,20 to 7,60. There are made 737 field measurements and it is seen that many of the machinery and workmanship productions rates per unit time are significantly lower, varying from 35% to 50%, of that defined in their technical specifications, measurements indicate that highest performance is reached in 7,60m diameter tunnel excavation. It is believed that these data will be helpful for planning and management process of tunnel construction projects, especially those planned to be built in Albania where labor market carries similar features.
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.
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.
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This paper presents a concept of two types multilevel inverters such as diode clamped and cascaded H-bridge for harmonic reduction on high power applications. Normally, multilevel inverters can be used to reduce the harmonic problems in electrical distribution systems. This paer focused on the performance and analysis of a three phase seven level inverter including diode clamped and cascaded H-bridge based on new tripizodal triangular space vector PWM technique approaches. TTMC based modified Space vector Pulse width modulation technique so called tripizodal triangular Space vector Pulse width modulation (TTMC-SVPWM) technique. In this paper the reference sine wave generated as in case of conventional off set injected SVPWM technique. It is observed that the TTMC-Space vector pulse width modulation ensures excellent, close to optimized pulse distribution results and THD is compared to seven level, diode clamped and cascaded multi level inverters. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
International Journal of Engineering Research and Applications (IJERA) aims to cover the latest outstanding developments in the field of all Engineering Technologies & science.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
International Journal of Engineering Research and 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.
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The cascaded multilevel inverter (CMLI) has gained much attention in recent years due to its advantages in high
voltage and high power with low harmonics applications. A standard cascaded multilevel inverter requires n DC
sources for 2n+1levels at the output, where n is the number of inverter stages. This paper presents a topology to
control cascaded multilevel inverter that is implemented with multiple DC sources to get 2"+1_ 1 levels. Without
using Pulse Width Modulation (PWM) technique, the firing circuit can be implemented using Microcontroller
which greatly reduces the Total Harmonic Distortion (THD) and switching losses. To develop the model of a
cascaded hybrid multilevel inverter, a simulation is done based on MATLAB/SIMULINK software and
hardware implementation was also done. Their integration makes the design and analysis of a hybrid multilevel
inverter more complete and detailed.
Power Quality Improvement Using Cascaded H-Bridge Multilevel Inverter Based D...IJERA Editor
Cascaded multilevel configuration of the inverter has the advantage of its simplicity and modularity over the
configurations of the diode-clamped and flying capacitor multilevel inverters. This paper presents a threephase,
five-level and seven level cascaded multilevel voltage source inverter based active filter for power line
conditioning to improve power quality in the distribution network. The DSTATCOM helps to improve the
power factor and eliminate the Total Harmonics Distortion (THD) drawn from a Non-Liner Diode Rectifier
Load (NLDRL). The compensation process is based on concept of p-q theory. A CHB Inverter is considered for
shunt compensation of a 11 kV distribution system. Finally a level shifted PWM (LSPWM) and phase shifted
PWM (PSPWM) techniques are adopted to investigate the performance of CHB Inverter. The results are
obtained through Matlab/Simulink software package.
A Novel Three Phase Multi-string Multilevel Inverter with High DC-DC Closed o...rnvsubbarao koppineni
this inverter reduces
number power devices and high performances.
Before this inverter provide a high step up DC-DC
converter with PI controller for better conversion
efficiency and to improve the output dc voltage of
varies renewable energy sources. This multi-string
multilevel inverter consists of six switches only
instead of eight switches in cascaded H-bridge
multilevel inverter in order to reduce conversion
losses. The main objective of this paper is to save
cost and size by removing any kind of transformer
as well as reducing the power devices
Simulation of 3-phase matrix converter using space vector modulationIJECEIAES
This paper illustrates the simulation of 3-phase matrix converter using Space Vector Modulation (SVM). Variable AC output voltage engendered using matrix converter with bidirectional power switches controlled by appropriate switching pulse. The conventional PWM converter engenders switching common mode voltage across the load system terminals, which cause to common mode current and its leads to bearing failure in load drive. These problems can be rectified using SVM and which minimize the effect on the harmonic fluctuation in AC output voltage and stress on the power switch is reduced using bidirectional switch for proposed 3-phase matrix converter. The simulation results have been presented to validate the proposed system using matlab / simulink.
Report On diode clamp three level inverterVinay Singh
three level diode clamp inverter. that converts any type of DC ( rectified, PV cell, battery etc.) to AC supply. we made by mosfet and ardiuno . in this ppt we present the Simulink model of a three-level inverter and the hardware reort of the inverter.
also discuss about other level inverter and there THD analysis, simulink model and detail. compression between another inverter.
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.
MODELING, ANALYSIS AND SIMULATION OF POLY-PHASE BOOST CONVERTERijsrd.com
The objective of this paper is to design Poly-phase boost converter which overcomes the problem of high input ripple current and output ripple voltage Digital control is more convenient for such a topology on account of the requirement of synchronization , phase shift operation , current balancing etc. This paper deals on analysis and implementation of four phase boost converter, each is a 35W unit and switched at 100 KHz. The waveforms are observed using MATLAB Simulink.
Analysis of 7-Level Cascaded & MLDCLI with Sinusoidal PWM & Modified Referenc...IJMTST Journal
Multilevel inverter offers several advantages compare to the conventional three phase bridge inverter in terms of lower dv/dt stresses, lower electromagnetic compatibility and better THD features. The primary use of DC to AC conversion & speed control of machines also voltage controller and reduce the harmonics in the levels of inverter by using cascade multilevel inverter. This paper presents a comparison of cascaded and multilevel dc link inverter (MLDCLI) Using only a DC power source and capacitors. A MLDCLI can be constructed by the series connection half and full bridge cells each having its own DC source .A multilevel voltage source inverter can be formed by connecting an MLDCL with a single bridge inverter. The MLDCL provides a DC voltage with the shape of a staircase with or without pulse width modulation (PWM) to the bridge inverter, which in turn alternates the polarity to produce an AC voltage. compared with the cascaded multilevel inverter, The MLDCLI can significantly reduce the switch count as the number of voltage levels increases beyond five for a given number of voltage levels , m , the required number of active switches is 2(m -1) for the existing multilevel inverter but is m+3 for the MLDCL inverters.
This paper presents the performance of a seven level cascaded multilevel inverter &MLDCLI Based on a sinusoidalPWM and modified Reference PWM control techniques. Performance analysis is made based on the results of simulation study conducted on the operation of the cascaded & MLDCLI using MATLAB/SIMULINK. The performance parameters chosen in the work include the waveform pattern harmonic spectrum, fundamental value & total harmonic distortion (THD) of the three phase cascaded H-Bridge MLI & MLDCLI.
Cascaded H-BRIDGE Converter for Domestic ApplicationsIJTET Journal
Multilevel inverters have recently found its way in to the high power applications in both domestic and industrial fields with its ability of low switching frequency. Out of all the topologies of a multilevel inverter, the cascaded H-bridge inverter is most commonly used due to its modular topology. This paper presents a five level cascaded multilevel inverter whose dc voltage source is charged by a solar panel. The switching is done by PIC microcontroller. The programming of the microcontroller is done using MPLAB programmer. Topology is designed with minimum size, weight & reduced power losses. The simulation work is done using MATLAB and experimental results have been presented to validate the theory.
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.
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Design & Simulation Of 3-Phase, 15-Level Inverter with Reverse Voltage Topology
1. Durga Bhavani. Peeta et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp122-126
www.ijera.com 122 | P a g e
Design & Simulation Of 3-Phase, 15-Level Inverter with Reverse
Voltage Topology
Durga Bhavani. Peeta, Sathish Kumar.K
M. Tech (P.E) scholar Dept of EEE, Ramachandra College of Engineering and Technology, JNTUK, A.P
Assisant Professor, Dept of EEE, Ramachandra College of Engineering and Technology, JNTUK, A.P
Abstract:
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
Keywords: Multilevel inverter, power electronics, SPWM, topology.
I. INTRODUCTION
Advancement in the research of Power electronic
invertersis still increasing with the rapid demands in
electrical systems. The emergence of multilevel
inverters has been in increase since the last decade.
These new types of converters are suitable for high
voltage and high power application due to their
ability to synthesize waveforms with better harmonic
spectrum[10].
Multilevel converters are mainly utilized to
synthesis a desired single- or three-phase voltage
waveform. Thedesired multi-staircase output voltage
is obtained by combining several dc voltage sources.
Solar cells, fuel cells,batteries and ultra-capacitors
are the most common independent sources used [1].
One important application ofmultilevel converters is
focused on medium and high-power conversion.
Nowadays, there exist three commercialtopologies of
multilevel voltage-source inverters: neutral point
clamped (NPC), cascaded H-bridge (CHB), and
flyingcapacitors (FCs)[2]. Among these inverter
topologies, cascaded multilevel inverter reaches the
higher output voltage and power levels (13.8 kV,30
MVA) and the higher reliability due to its modular
topology[3].
Diode-clamped multilevel converters are used in
conventional high-power ac motor drive applications
likeconveyors, pumps, fans, and mills. They are also
utilized in oil, gas, metals, power, mining, water,
marine, andchemical industries. They have also been
reported to be used in a back-to-back configuration
for regenerativeapplications[4]. Flying capacitor
multilevel converters have been used in high-
bandwidth high-switching frequencyapplications
such as medium-voltage traction drives. Finally,
cascaded H-bridge multilevel converters have
beenapplied where high power and power quality are
essential, for example, static synchronous
compensators active filterand reactive power
compensation applications, photovoltaic power
conversion, uninterruptible power supplies,
andmagnetic resonance imaging. Furthermore, one of
the growing applications for multilevel motor drives
is electric andhybrid power trains.
For increasing voltage levels the number of
switches also will increase in number. Hence the
voltage stresses andswitching losses will increase and
the circuit will become complex. By using the
proposed topology number ofswitches will reduce
significantly and hence the efficiency will improve.
A multi-stage inverter using three-state
converters is being analyzed for multipurpose
applications, such asactive power filters, static var
compensators and machine drives for sinusoidal and
trapezoidal currentapplications. The great advantage
of this kind of converter is the minimum harmonic
distortion obtained.
The circuit of Fig.1 shows the basic topology of
oneconverter used for the implementation of multi-
stageconverters.It is based on the simple, four
switches converter,used for single phase inverters or
for dual converters. Theseconverters are able to
produce three levels of voltage in theload: +Vdc, -
Vdc, and Zero[7].
RESEARCH ARTICLE OPEN ACCESS
2. Durga Bhavani. Peeta et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp122-126
www.ijera.com 123 | P a g e
Fig.1. Basic idea diagram of three-level module for
building multi stage inverter
This paper mainly focuses on the general
multilevel inverter schematic. A general method of
multilevel modulation phase disposition (PD) SPWM
is utilized to drive the inverter and can be extended to
any number of voltage levels. Here , in this paper the
proposed multilevel scheme extended up to 15-
levels.. In this work, the asymmetric 15 level inverter
is presented. This inverter is designed to avoid the
regeneration problem - power flow from the load to
the inverter - in some of the power cells. This is
achieved by obtaining the firing angles associated
with the power cells considering a minimum load
voltage THD. The simulation and experimental
results of the proposed 15-level inverter topology are
also presented. Finally, a power flow analysis is
accomplished and simulated results show the
feasibility of this approach
II. PROPOSED 15-LEVEL INVERTER
Multilevel inverters are the alternative for
medium voltage applications. Within the inverters
types there are symmetric and asymmetric topologies.
The asymmetric inverters have different DC voltage
values. The most common topology is when the
different cells are implemented in cascade
arrangement, where the DC voltage are in multiples
of 3, obtaining an AC voltage with 3n
= 27 levels (n =
3 cascaded inverters). This topology provides a load
voltage with low harmonic content, THD <; 3%.
However, this high quality voltage has a non-
negligible drawback, which is the presence of
regeneration in some of the inverters, independent of
load type[1]. This phenomenon is due to the
modulation technique (Nearest Level Modulation)
used by this inverter. In this work, the asymmetric 15
level inverter is presented. This inverter is designed
to avoid the regeneration problem - power flow from
the load to the inverter - in some of the power cells.
This is achieved by obtaining the firing angles
associated with the power cells considering a
minimum load voltage THD. Finally, a power flow
analysis is accomplished and simulated results show
the feasibility of this approach.
Fig.2 shows the proposed inverter fed to 3-phase
a.c load and Fig.3 shows the simplified diagram with
three inverters per phase.
Fig.2. Basic idea diagram of three-phase inverter
Fig.3. Schematic of seven level inverter in single
phase
The most commonly used multilevel topologyis
the diode clamped inverter, in which the diode isused
as the clamping device to clamp the dc busvoltage so
as to achieve steps in the output voltage.
A three-level diode clamped inverter consistsof
two pairs of switches and two diodes. Each
switchpairs works in complimentary mode and the
diodesused to provide access to mid-point voltage. In
athree-level inverter each of the three phases of
theinverter shares a common dc bus, which has
beensubdivided by two capacitors into three levels.
TheDC bus voltage is split into three voltage levels
byusing two series connections of DC capacitors,C1
andC2. The voltage stress across each switching
device islimited to Vdc through the clamping diodes
Dc1 andDc2. It is assumed that the total dc link
voltage is Vdcand mid point is regulated at half of the
dc linkvoltage, the voltage across each capacitor is
Vdc/2(Vc1=Vc2=Vdc/2).[1]
A. Switching Sequences:
In order to avoid unwanted voltage levels during
switchingcycles, the switching modes should be
selected so that theswitching transitions become
minimal during each mode transfer.This will also
help to decrease switching power dissipation.
3. Durga Bhavani. Peeta et al Int. Journal of Engineering Research and Applications www.ijera.com
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In order to produce 15- levels by Sinusoidal Pulse
Width Modulation (SPWM), three saw-
toothwaveforms for carrier and a sinusoidal reference
signal formodulator are required as shown in Fig. 4.
Fig. 4.SPWM carrier and modulator for proposed 15-
level inverter
III. MATLAB BASED SIMULATION&
RESULTS
A. MATLAB based simulation :
Fig.4. shows the complete MATLAB based
simulation masked diagram of the proposed 15-level,
3-phase inverter.
Fig.4.MATLAB based simulation masked diagram of
the proposed 15-level, 3-phase inverter
Fig.5. shows the input DC voltage source to the
proposed 15-level, 3-phase inverter
Fig.5. Input DC voltage source to the proposed 15-
level, 3-phase inverter
Fig.6. shows power electronic based bridge circuit of
the proposed 15-level, 3-phase inverter
Fig.6. Simulation diagram of power electronic based
bridge circuit of the proposed 15-level, 3-phase
inverter
Fig.7. shows the gate controlled pulse to the proposed
15-level, 3-phase inverter
Fig.8.shows the inversion of DC to 3-phase
MATLAB based simulation diagram.
4. Durga Bhavani. Peeta et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp122-126
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Fig.7. Gate controlled pulse to the proposed 15-level,
3-phase inverter
Fig.8. DC to AC 3-phase inversion MATLAB based
simulation diagram.
Simulation parameters for the proposed 15-level,
3-phase inverter is given by in the Table.1
B. Simulation Results:
Fig.9. shows the 3-phase, 15-level output voltage
waveform from the proposed inverter.
Fig.10. shows the THD calculation of proposed 3-
phase, 15-level inverter using powergui FFT Analysis
tool.
Fig.9. 3-Phase, 15-level output voltage waveform
from the proposed inverter
Fig.10. THD calculation of proposed 3-phase, 15-
level inverter using powergui FFT Analysis tool
Fig.11. shows the 3-phase voltage and 3-phase
current waveform from the proposed inverter.
Fig.11. 3-phase voltage (upper) and 3-phase current
(lower) waveform from the proposed inverter
respectively
Table .2. Shows the r.m.s values from phase voltages
and currents
5. Durga Bhavani. Peeta et al Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 1( Part 2), January 2015, pp122-126
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TABLE1.SIMULATION SPECIFICATIONS
Parameter Rating
Input DC supply (V) 50V
IGBT/Diode Internal
Resistance Ron
1 m Ω
Snubber Resistance ,
Rs (Ω)
1µΩ
Nominal frequency
(Hz)
50 Hz
Active Power (W) 10KW
Reactive Power (Var) 8Kvar
Damping factor of
filter
0.8
TABLE.2. RMS VALUES OF OUTPUT
RESPONSES OF PROPOSED INVERTER
Output Response RMS Value
Phase A voltage (V) 363.4
Phase B voltage (V) 363.3
Phase C voltage (V) 363.3
Phase A Current (A) 43.89
Phase B Current (A) 43.85
Phase C Current (A) 43.85
IV. CONCLUSION
An efficient 3-phase, 15-level inverter is
presented in the paper. The resultant simulation
graphs show the accuracy of the proposed
inverter.High performance switchesare adopted to
reduce the conductionlosses and improve the
efficiency.Experimental results that confirm the
feasibilityof the proposed 3-phase, 15-level
inverter.Finally, MATLAB based simulink results
showns the THD value at reasonable level.
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