1) The document presents a modified cascaded multilevel inverter topology for induction motor drive applications that reduces the number of switches compared to conventional designs.
2) The proposed topology uses 7 switches and 3 diodes to generate 7 voltage levels, whereas conventional designs require 12 switches. This reduces switching losses, cost, and complexity.
3) Simulation and experimental results show the proposed design can generate 7 voltage levels to drive an induction motor. FFT analysis shows lower total harmonic distortion compared to conventional designs.
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.
Nowadays power electronics circuits are embedded to most of electrical application areas. This approached offers a great control mechanism with simple and easy circuit configuration. Switched Reluctance Motor (SRM) is one of the most recent apparatus which draws a great number of researchers’ interests. Previously several attempts are made to use the power converters as driver for SRM such as Voltage Source Inverter (VSI) and bridge converters. This paper presents an analysis study of three level inverter to control the SRM. The inverter is controlled using space vector modulation SVM. The aim of this paper is to report the use the multilevel inverter to be fed into the SRM. The implementation of the multilevel inverter is abl to reduce the Total Harmonics Distortion (THD). Performance comparison are made between the multilevel and previous power electronics circuits that applied to the SRM. The simulation results have been conducted by MATLAB/SIMULINK software.
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.
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.
Nowadays power electronics circuits are embedded to most of electrical application areas. This approached offers a great control mechanism with simple and easy circuit configuration. Switched Reluctance Motor (SRM) is one of the most recent apparatus which draws a great number of researchers’ interests. Previously several attempts are made to use the power converters as driver for SRM such as Voltage Source Inverter (VSI) and bridge converters. This paper presents an analysis study of three level inverter to control the SRM. The inverter is controlled using space vector modulation SVM. The aim of this paper is to report the use the multilevel inverter to be fed into the SRM. The implementation of the multilevel inverter is abl to reduce the Total Harmonics Distortion (THD). Performance comparison are made between the multilevel and previous power electronics circuits that applied to the SRM. The simulation results have been conducted by MATLAB/SIMULINK software.
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.
Single Phase Matrix Converter for Input Power Factor Improvementiosrjce
IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Application of single phase matrix converter topology to an uninterruptible p...eSAT 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
An Improved Single Phase Transformer less Inverter Topology for Cost Effecti...IJMER
In grid connected PV systems, the elimination of isolation transformer introduces common
mode leakage current due to the parasitic capacitance between PV panels and the ground. The common
mode leakage current reduces the efficiency of power conversion stage, affects the quality of grid
current, deteriorate the electric magnetic compatibility and give rise to various safety threats. In order
to eliminate the leakage current, an improved transformer less topology with virtual DC bus concept is
proposed here. By connecting the grid neutral line directly to the negative pole of the DC bus, the stray
capacitance between the PV panels and the ground is bypassed. The topology consists of only five power
switches, two capacitors and the filter section. Therefore, the power electronics cost can be curtailed.
This advanced topology can be modulated with the sinusoidal pulse width modulation (SPWM) to reduce
the output current ripple. The simulation result of the proposed topology using MATLAB/SIMULINK is
presented.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
NON-ISOLATED SOFT SWITCHING DC-DC CONVERTER AND LOAD AT FULL RANGE OF ZVS IAEME Publication
A non isolated soft switching DC–DC converter and load at full range of zero-voltage
switching (ZVS) characteristic is proposed. The proposed converter consists of an auxiliary circuit,
an inductor, two switches, and 2 diodes to achieving high efficiency at full range of load. At low
and heavy loads, ZVS of switching device is achieved by energy storing component. The inductor
energy stored varies with load and hence results in minimizes conduction loss. This leads to
switching of device for full range of load. The proposed DC - DC converter achieves high
efficiency as switching loss is reduced due to soft switching and ZVS operation which severe to
reduce conduction loss. The efficiency is improved about 4% in boost mode (2.5% in buck mode) at
full range of load. To verify the performance of the proposed converter, experimental results
prototype are presented.
SRF CONTROLLED DVR FOR COMPENSATION OF BALANCED AND UNBALANCED VOLTAGE DISTUR...IAEME Publication
The growth of power electronictechnology in the field of electric power sector has caused a greater awarenesson the power quality of distribution systems. With the re-structuring of powersystems and with shifting trend towards distributed and dispersed generation,the issue of power quality is going to take newer dimensions. The presentresearch is to identify the prominent concerns in this area and hence themeasures that can enhance the quality of power. This paper investigates theproblems of voltage sag, swell and its severe impact on nonlinear loads,sensitive loads.
Close Loop Control of Induction Motor Using Z-Source InverterIJSRD
In this paper a new closed loop control of induction motor fed by a Z – source inverter based on the vector control or field oriented control strategy is presented. Induction motor is supplied by Z – source inverter, in the Z – source inverter the term Z denotes impedance which means a combination of L & C element which are cross connected. The Z-source inverter consists of a unique impedance network (or circuit) to couple the inverter main circuit to the power supply, hence providing great features that cannot be observed in the conventional voltage-source inverter and current-source inverters in which capacitor and inductor are used, respectively.In the field oriented control method or vector control method speed of the induction motor, torque & 3 phase stator current is given to the field oriented controller and gate pulses for the inverter is generated to obtain the desired operation of the induction motor.
Analysis and Simulation of Solar PV Connected with Grid Accomplished with Boo...YogeshIJTSRD
This paper deals with a solar PV array connected with grid system. This system consists of PV cells with 30 KW system, Boost converter, three phase inverter with suitable control system and three phase load. This paper gives analysis of each components of the system. The output voltage from the solar PV cells are variable according to radiation intensity and temperature so in order to connect with grid the output voltage should be fixed and converted to AC voltage and this job will be done by an inverter. A very effective control system has been developed for the inverter based on pulse width modulation. This paper presents an intensive performance and dynamic behavior of a grid related PV energy conversion system. The PV system is developed and simulated with the help of MATLAB Simulink software environment. Abhishek Verma | Dr. Anup Mishra | Brahma Nand Thakur "Analysis and Simulation of Solar PV Connected with Grid Accomplished with Boost Converter and PWM Based Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-3 , April 2021, URL: https://www.ijtsrd.com/papers/ijtsrd40056.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/40056/analysis-and-simulation-of-solar-pv-connected-with-grid-accomplished-with-boost-converter-and-pwm-based-inverter/abhishek-verma
Proposed PV Transformer-Less Inverter Topology Technique for Leakage Current ...IJPEDS-IAES
Importance and demand of using renewable energy is dramatically escalated globally. Hence, the use of renewable energy is going to touch in peak. This demand is varying according to the site choosing. For instance, Wind is preferable where air is following highly as well as solar recommended place is high sun ray reducing places. Especially, the renewable system is highly recommended for electrification issues where it’s possible to produce the electricity for fulfilling rural and remote areas electricity problem. The photovoltaic (PV) panel of connecting with transformer based system is popular where some limitations are occurred especially cost and weight. In contrast, in this paper is focusing these issues where the transformer-less inverter system is used. Here will discuss some transformer-based and transformer-less inverter topologies and the leakage current issue which is occurred when transformer-less inverter system is used. Moreover, here is proposed a topology for reducing the leakage current after doing switching technique in both 50% and 75% duty cycle where output voltage remains quite same.
Push-Pull Converter Fed Three-Phase Inverter for Residential and Motor LoadIJPEDS-IAES
The proposed paper is an new approach for power conditioning of a PV
(photo-voltaic) cell array. The main objective is to investigate an approach to
provide and improve the delivered electric energy by means of power
conditioning structures with the use of alternative renewable resources
(ARRs) for remote rural residential or industrial non-linear loads. This
approach employs a series-combined connected boost and buck boost DCDC
converter for power conditioning of the dc voltage provided by a photovoltaic
array. The input voltage to the combined converters is 100 V
provided from two series connected PV cells, which is converted and
increased to 200 V at the dc output voltage. Series-combined connected
boost and buck-boost DC-DC converters operate alternatively. This helps to
reduce the input ripple current and provide the required 400 Vdc on a
sinusoidal PWM three-phase inverter. Analysis of the two series-combined
DC-DC converters is presented along with simulation results. Simulations of
the series-combined DC-DC converters are presented with an output DC
voltage of 200 V and a maximum output load of Po=600 W.
A ZVS Interleaved Boost AC/DC Converter Using Super Capacitor Power for Hybri...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.
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.
Pi controller based of multi level upqc using dq0 transformation to improve p...eSAT 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.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Single Phase Matrix Converter for Input Power Factor Improvementiosrjce
IOSR Journal of Electrical and Electronics Engineering(IOSR-JEEE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electrical and electronics engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electrical and electronics engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Application of single phase matrix converter topology to an uninterruptible p...eSAT 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
An Improved Single Phase Transformer less Inverter Topology for Cost Effecti...IJMER
In grid connected PV systems, the elimination of isolation transformer introduces common
mode leakage current due to the parasitic capacitance between PV panels and the ground. The common
mode leakage current reduces the efficiency of power conversion stage, affects the quality of grid
current, deteriorate the electric magnetic compatibility and give rise to various safety threats. In order
to eliminate the leakage current, an improved transformer less topology with virtual DC bus concept is
proposed here. By connecting the grid neutral line directly to the negative pole of the DC bus, the stray
capacitance between the PV panels and the ground is bypassed. The topology consists of only five power
switches, two capacitors and the filter section. Therefore, the power electronics cost can be curtailed.
This advanced topology can be modulated with the sinusoidal pulse width modulation (SPWM) to reduce
the output current ripple. The simulation result of the proposed topology using MATLAB/SIMULINK is
presented.
Design and Simulation of Efficient DC-DC Converter Topology for a Solar PV Mo...Sajin Ismail
Modulated Integrated Converter systems are considered to be the new and global turning point in the field of
Solar PV systems. These converters are highly recognised for its modular size and compact nature and they are supposed to
be attached directly with each PV module and since one PV module is having the power rating of a few watts ranging from
0-500Ws, the design rating would be in the same range and thus the most vital condition in such a design is efficiency
under these relatively low loads. In this paper an isolated interleaved boost converter topology is considered in the DC-DC
section and which is designed and simulated for a specific power rating (250W) and the efficiency is analysed with varying
load conditions and compared with the target efficiency of the system.
NON-ISOLATED SOFT SWITCHING DC-DC CONVERTER AND LOAD AT FULL RANGE OF ZVS IAEME Publication
A non isolated soft switching DC–DC converter and load at full range of zero-voltage
switching (ZVS) characteristic is proposed. The proposed converter consists of an auxiliary circuit,
an inductor, two switches, and 2 diodes to achieving high efficiency at full range of load. At low
and heavy loads, ZVS of switching device is achieved by energy storing component. The inductor
energy stored varies with load and hence results in minimizes conduction loss. This leads to
switching of device for full range of load. The proposed DC - DC converter achieves high
efficiency as switching loss is reduced due to soft switching and ZVS operation which severe to
reduce conduction loss. The efficiency is improved about 4% in boost mode (2.5% in buck mode) at
full range of load. To verify the performance of the proposed converter, experimental results
prototype are presented.
SRF CONTROLLED DVR FOR COMPENSATION OF BALANCED AND UNBALANCED VOLTAGE DISTUR...IAEME Publication
The growth of power electronictechnology in the field of electric power sector has caused a greater awarenesson the power quality of distribution systems. With the re-structuring of powersystems and with shifting trend towards distributed and dispersed generation,the issue of power quality is going to take newer dimensions. The presentresearch is to identify the prominent concerns in this area and hence themeasures that can enhance the quality of power. This paper investigates theproblems of voltage sag, swell and its severe impact on nonlinear loads,sensitive loads.
Close Loop Control of Induction Motor Using Z-Source InverterIJSRD
In this paper a new closed loop control of induction motor fed by a Z – source inverter based on the vector control or field oriented control strategy is presented. Induction motor is supplied by Z – source inverter, in the Z – source inverter the term Z denotes impedance which means a combination of L & C element which are cross connected. The Z-source inverter consists of a unique impedance network (or circuit) to couple the inverter main circuit to the power supply, hence providing great features that cannot be observed in the conventional voltage-source inverter and current-source inverters in which capacitor and inductor are used, respectively.In the field oriented control method or vector control method speed of the induction motor, torque & 3 phase stator current is given to the field oriented controller and gate pulses for the inverter is generated to obtain the desired operation of the induction motor.
Analysis and Simulation of Solar PV Connected with Grid Accomplished with Boo...YogeshIJTSRD
This paper deals with a solar PV array connected with grid system. This system consists of PV cells with 30 KW system, Boost converter, three phase inverter with suitable control system and three phase load. This paper gives analysis of each components of the system. The output voltage from the solar PV cells are variable according to radiation intensity and temperature so in order to connect with grid the output voltage should be fixed and converted to AC voltage and this job will be done by an inverter. A very effective control system has been developed for the inverter based on pulse width modulation. This paper presents an intensive performance and dynamic behavior of a grid related PV energy conversion system. The PV system is developed and simulated with the help of MATLAB Simulink software environment. Abhishek Verma | Dr. Anup Mishra | Brahma Nand Thakur "Analysis and Simulation of Solar PV Connected with Grid Accomplished with Boost Converter and PWM Based Inverter" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-3 , April 2021, URL: https://www.ijtsrd.com/papers/ijtsrd40056.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/40056/analysis-and-simulation-of-solar-pv-connected-with-grid-accomplished-with-boost-converter-and-pwm-based-inverter/abhishek-verma
Proposed PV Transformer-Less Inverter Topology Technique for Leakage Current ...IJPEDS-IAES
Importance and demand of using renewable energy is dramatically escalated globally. Hence, the use of renewable energy is going to touch in peak. This demand is varying according to the site choosing. For instance, Wind is preferable where air is following highly as well as solar recommended place is high sun ray reducing places. Especially, the renewable system is highly recommended for electrification issues where it’s possible to produce the electricity for fulfilling rural and remote areas electricity problem. The photovoltaic (PV) panel of connecting with transformer based system is popular where some limitations are occurred especially cost and weight. In contrast, in this paper is focusing these issues where the transformer-less inverter system is used. Here will discuss some transformer-based and transformer-less inverter topologies and the leakage current issue which is occurred when transformer-less inverter system is used. Moreover, here is proposed a topology for reducing the leakage current after doing switching technique in both 50% and 75% duty cycle where output voltage remains quite same.
Push-Pull Converter Fed Three-Phase Inverter for Residential and Motor LoadIJPEDS-IAES
The proposed paper is an new approach for power conditioning of a PV
(photo-voltaic) cell array. The main objective is to investigate an approach to
provide and improve the delivered electric energy by means of power
conditioning structures with the use of alternative renewable resources
(ARRs) for remote rural residential or industrial non-linear loads. This
approach employs a series-combined connected boost and buck boost DCDC
converter for power conditioning of the dc voltage provided by a photovoltaic
array. The input voltage to the combined converters is 100 V
provided from two series connected PV cells, which is converted and
increased to 200 V at the dc output voltage. Series-combined connected
boost and buck-boost DC-DC converters operate alternatively. This helps to
reduce the input ripple current and provide the required 400 Vdc on a
sinusoidal PWM three-phase inverter. Analysis of the two series-combined
DC-DC converters is presented along with simulation results. Simulations of
the series-combined DC-DC converters are presented with an output DC
voltage of 200 V and a maximum output load of Po=600 W.
A ZVS Interleaved Boost AC/DC Converter Using Super Capacitor Power for Hybri...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.
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.
Pi controller based of multi level upqc using dq0 transformation to improve p...eSAT 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.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Performance Evaluation of Nine Level Modified CHB Multilevel Inverter for Var...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Comparison of symmetrical and asymmetrical cascaded current source multilevel...eSAT Journals
Abstract This paper presents symmetrical and asymmetrical cascaded multilevel inverter approach for high power output applications. It is based on the cascade connection of the H-bridge inverter cells. Comparison of symmetrical and asymmetrical current source multi level inverter is shown using 2 H-bridge inverter cells with cascade connection. Now ever by the supplies which are in GP with different ratios like 2,3,etc. Structural and operational characteristics are discussed and their inherent advantages are shown. Simulation using Matlab Simulink is done to verify the performance. Simulation and results for this proposed scheme are presented in this paper. Index Terms: Asymmetrical cascaded multilevel inverter, Current source multi level inverter, MATLAB Simulink, Optimization angle control, Symmetrical multi level inverter, Total harmonic distortion (THD).
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.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
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 presents an analytical comparison between two-level inverter and three-level neutral point diode clamped inverters for electric vehicle traction purposes. The main objective of the research is to declare the main differences in the performance of the two inverter schemes in terms of the switching and conduction losses over an entire domain of the modulation index and the phase angle distribution, steady-state operation, transient operation at a wide range of speed variation, and the total harmonic distortion THD% of the line voltage output waveform. It also declares the analysis of the three-level neutral point diode clamped inverter (NPCI) obstacle and the unbalance of the DC-link capacitor voltages. The introduced scheme presents an Induction Motor (IM) drive for electric vehicle (EV) applications. Considering the dynamic operation of the EV, the speed of the three-phase induction motor is controlled using a scalar V/Hz control for the full range of the IM power factor (PF). A comprehensive MATLAB/Simulink model for the proposed scheme is established.
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.
HIGH EFFICIENT BRIDGELESS BOOST RECTIFIER FOR LOW VOLTAGE ENERGY HARVESTING A...IAEME Publication
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The main goal of utilizing Selective Harmonic Elimination (SHE) techniques in Multilevel Inverters (MLI) is to produce a high-quality output voltage signal with a minimum Total Harmonic Distortion (THD). By calculating N switching angles, SHE technique can eliminate (N-1) low order odd harmonics of the output voltage waveform. To optimized and obtained these switching angles, N of nonlinear equations should be solved using a numerical method. Modulation index (m) and duty cycle play a big role in selective harmonic elimination technique to obtain a minimum harmonic distortion and desired fundamental component voltage. In this paper, a novel Optimization Harmonic Elimination Technique (OHET) based on SHE scheme is proposed to re-mitigate Total Harmonic Distortion. The performance of seven-level H-bridge cascade inverter is evaluated using PSIM and validated experimentally by developing a purposely built microcontroller-based printed circuit board.
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6.[36 45]seven level modified cascaded inverter for induction motor drive applications
1. Journal of Information Engineering and Applications www.iiste.org
ISSN 2224-5758 (print) ISSN 2224-896X (online)
Vol 1, No.1, 2011
Seven Level Modified Cascaded Inverter for Induction Motor
Drive Applications
M.Murugesan
Faculty of Electrical and Electronics Engineering,
V.S.B Engineering College, Karur
Tamil Nadu, India
E-mail: murugesan.kec@gmail.com
S.Sivaranjani
Faculty of Electrical and Electronics Engineering,
V.S.B Engineering College, Karur
Tamil Nadu, India
E-mail: shivaranjani_s@rediffmail.com
G.Asokkumar
Faculty of Electrical and Electronics Engineering,
Annai Mathammal Sheela Engineering College, Namakkal
Tamil Nadu, India
E-mail: ganeshashokkumar@gmail.com
R.Sivakumar
Faculty of Electrical and Electronics Engineering,
V.S.B Engineering College, Karur
Tamil Nadu, India
E-mail: odaisiva@gmail.com
Abstract
In this paper, an H-bridge inverter topology with reduced switch count technique is introduced. This technique
reduces the number of controlled switches used in conventional multilevel inverter. To establish a single phase
system, the proposed multilevel inverter requires one H-bridge and a multi conversion cell. A multi conversion
cell consists of three equal voltage sources with three controlled switches and three diodes. In conventional
method, twelve controlled switches are used to obtain seven levels. Due to involvement of twelve switches the
harmonics, switching losses, cost and total harmonic distortion are increased. This proposed topology also
increases the level to seven with only seven controlled switches. It dramatically reduces the complexity of
control circuit, cost, lower order harmonics and thus effectively reduces total harmonic distortion.
Keywords: Cascaded Multilevel Inverter, H-bridge Inverter, Total Harmonic Distortion, Sinusoidal Pulse Width
Modulation, Insulated Gate Bipolar Transistor
1. Introduction
Numerous industrial applications have begun to require higher power apparatus in recent years. Some medium
voltage motor drives and utility applications require medium voltage and MW power level. Therefore high
power and medium voltage inverter has recently become a research focus. As far as conventional two level
inverter is concerned, it exhibits many problems when used in high power applications (Franquelo 2008).
Multilevel inverters have been gained more attention for high power application in recent years which can
operate at high switching frequencies while producing lower order harmonic components. A multilevel inverter
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2. Journal of Information Engineering and Applications www.iiste.org
ISSN 2224-5758 (print) ISSN 2224-896X (online)
Vol 1, No.1, 2011
not only achieves high power ratings, but also enables the use of renewable energy sources. Renewable energy
sources such as photovoltaic, wind and fuel cells, which can be easily interfaced to a multilevel inverter system
for high power applications (Rodriguez et al. 2002). There are several topologies such as diode clamped
multilevel inverter or neutral point clamped inverter, flying capacitor based multilevel inverter, and cascaded
multilevel inverter (Du et al. 2006). The main disadvantage still exists in diode clamped multilevel inverter
topology, which restricts the use of it to the high power range of operation. Moreover flying capacitor based
multilevel inverter also exhibits a disadvantage including more number of capacitors (Fang Zheng Peng 2001).
The first topology introduced is the series H-bridge design, in which several configurations have been obtained.
This topology consists of series power conversion cells which form cascaded H- bridge multilevel inverter and
power levels will be scaled easily. An apparent disadvantage of this topology is large number of controlled
switches. The proposed topology for multilevel inverter has seven levels associated with a seven number of
power switches. In this proposed topology sinusoidal pulse width modulation technique is used.
2. Cascaded Multilevel Inverter (CMLI)
The general structure of cascaded multilevel inverter for a single phase system is shown in Figure 1. Each
separate voltage source Vdc1, Vdc2, Vdc3 is connected in cascade with other sources via a special H-bridge circuit
associated with it. Each H-bridge circuit consists of four active switching elements that can make the output
voltage either positive or negative polarity; or it can also be simply zero volts which depends on the switching
condition of switches in the circuit. This multilevel inverter topology employs three voltage sources of equal
magnitudes. It is fairly easy to generalize the number of distinct levels (Corzine et al. 2003 and 2004).
The S number of sources or stages and the associated number of output level can be written as follows
2 1
(1)
For example if S=3, the output wave form has seven levels (±3Vdc, ±2Vdc, ±1Vdc and 0). The voltage on each
stage can be calculated by using the equation,
1 1, 2, 3 …
(2)
The number of controlled switches used in this topology is expressed as,
4
(3)
The output voltage of the multilevel inverter is given as,
(4)
Where A1, A2 and A3 are DC voltage sources
The advantages of cascaded multilevel inverter are modularized layout and packaging. This enables the
manufacturing process to be done more quickly and cheaply. The drawback of this topology needs a separate
DC source for each of H-bridge and involves high number of semiconductor switches. Figure 2 shows the
typical output voltage waveform of a seven level cascaded inverter with three separate DC sources.
3. Modified Cascaded Multilevel Inverter (MCMLI)
The general structure of a proposed cascaded multilevel inverter is shown in Figure 3. This inverter consists of a
multi conversion cell and an H bridge. A multi conversion cell consists of three separate voltage sources (Vdc1,
Vdc2, Vdc3), each source connected in cascade with other sources via a circuit consists of one active switching
element and one diode that can make the output voltage source only in positive polarity with several levels.
Only one H-bridge is connected with multi conversion cell to acquire both positive and negative polarity. By
turning on controlled switches S1 (S2 and S3 turn off) the output voltage +1Vdc (first level) is obtained.
Similarly turning on of switches S1, S2 (S3 turn off) +2Vdc (second level) output is produced across the load.
Similarly +3Vdc levels can be achieved by turning on S1, S2, S3 switches as shown in Table 1. The main
advantage of proposed modified cascaded multilevel inverter is seven levels with only use of seven switches.
The S number of DC sources or stages and the associated number output level can be calculated by using the
equation as follows,
2 1
(5)
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3. Journal of Information Engineering and Applications www.iiste.org
ISSN 2224-5758 (print) ISSN 2224-896X (online)
Vol 1, No.1, 2011
For an example, if S=3, the output wave form will have seven levels (±3Vdc, ±2Vdc, ±1Vdc and 0). Similarly
voltage on each stage can be calculated by using the equation as given,
1 1, 2, 3 …
(6)
The number switches used in this topology is given by the equation as follows,
2 4
(7)
The switching table for modified cascaded multilevel inverter is shown in Table 1. It depicts that for each
voltage level, only one of the switches is in ON condition among the paralleled switches. Multi conversion cell
converts DC voltage into a stepped DC voltage, which is outputted as a stepped or approximately sinusoidal AC
waveform by the H-bridge inverter. In this H-bridge, for positive half cycle, switches Q1 and Q2 will be turned
on, similarly for negative half cycle switches Q3 and Q4 must be in ON condition. Figure 2 shows the typical
output voltage waveform of a proposed cascaded multilevel inverter with three separate DC sources.
4. PWM for Harmonics Reduction
PWM technique is extensively used for eliminating harmful low-order harmonics in inverters. In PWM control,
the inverter switches are turned ON and OFF several times during a half cycle and output voltage is controlled
by varying the pulse width. SPWM techniques are characterized by constant amplitude pulses with different
duty cycle for each period. The width of this pulses are modulated to obtain inverter output voltage control and
to reduce its harmonic content. Sinusoidal pulse width modulation is the mostly used method in motor control
and inverter application (Ismail 2006).In order to verify the ability of the proposed multilevel inverter topology
to synthesize an output voltage with desired amplitude and better harmonic spectrum, programmed SPWM
technique is applied to determine the required switching angles. It has been proved that in order to control the
fundamental output voltage and eliminate ‘n’ harmonics, ‘n+1’ equations are needed. The method of elimination
will be presented for 7-level inverter such that the solution for three angles is achieved. The Fourier series
expansion of output voltage waveform using fundamental frequency switching scheme as follows
(8)
Where K is the number of
switching angle required for 7 level inverter. Ideally, for a given fundamental voltage V1, it is required to
determine the switching angles , ,…, so that output voltage Vo( t)=V1sin( t ) and a specific higher
harmonics of Vn(n t) are equal to zero. According to the three phase theory in balanced three phase system
third order harmonic is cancelled. The switching angles can be found by solving the following equations
cos cos cos $
cos 5 cos 5 cos 5 0
cos 7 cos 7 cos 7 0
(9)
()
Where modulation index, $ *+,-
/
One approach to solve the set of nonlinear transcendental equations (9), is to use an iterative method such as the
Newton-Raphson method (Patel & Hoft 1973). In contrast to iterative methods, the approach here is based on
solving polynomial equations using the theory of resultants which produces all possible solutions (Chiasson et
al. 2003). The transcendental equations characterizing the harmonic content can be converted into polynomial
equations. Then the resultant method is employed to find the solutions when they exist. These sets of solutions
have to be examined for its corresponding total harmonic distortion (THD) in order to select the set which
generate the lowest harmonic distortion (mostly due to the 11th and 13th harmonics). The computed THD in
percent is defined by
6 6 6 6
4(5 7(8 7(9 7⋯7();
012% 6 < 100
()
(10)
Transforming the transcendental equations (9) into polynomial equations using the change of variables and the
trigonometric identities
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4. Journal of Information Engineering and Applications www.iiste.org
ISSN 2224-5758 (print) ISSN 2224-896X (online)
Vol 1, No.1, 2011
x cos θ , x cos θ , x cos θ , x> cos θ> ,
x? cos θ? , x@ cos θ@ , xA cos θA
(11)
cos 5θ 5cosθ B 20cos θ 16 cos ? θ
cos 7θ B7cosθ 56cos θ B 112 cos ? θ 64cos A θ
(12)
To transfer (9) into the equivalent conditions
p x x x x Bm 0
A
p? x F 5 xG B 20xG 16xG
?
0
GH
pA x ∑A B 7xG 56xG B 112xG 64xG
GH
? A
0
(13)
System (12) is a set of three polynomial equations in three unknowns X1, X2, and X3, where X=( X1, X2, X3,)
and the angles condition must satisfy 0 X1 X2 X3 1. Polynomial systems are also considered to
compute the solutions of the harmonic elimination equations by iterative numerical methods which give only
one solution. In contrast, this system of polynomial equations will be solved using resultant such that all
possible solution of (9) can be found. A systematic procedure to do this is known as elimination theory and uses
the notion of resultants. The details of this procedure can be found in (Chiasson et al. 2004).
5. Simulation Result Analysis
The performance of the proposed modified cascaded multilevel inverter for induction motor drive is verified
through the simulation results. It can be seen from Figure 3 input voltages for each succeeding voltage source is
same. Figure 5 shows the simulation diagram of three phase modified cascaded multilevel inverter for induction
motor drive. From that multilevel inverter seven level can be easily achieved by making the switching pulse
sequences as shown in Figure 6a and Figure 6b. Figure 7a and 7b shows the output voltage waveform of single
phase line to ground and line to line voltages of the proposed inverter. Figure 8a and 8b shows the output
voltage waveform of three phase line to ground and line to line voltages of the proposed inverter. In this phase
voltage is 220V and line voltage is 400V for seven level. Figure 9a and 9b shows the MATLAB simulation
output waveform of speed and torque curve of induction motor. From the speed and torque curves, it is
concreted that rated speed quickly achieved within 0.4 msec and the torque is quickly settled at 0.45 msec.
Figure 10a shows the stator current waveform of induction motor. Therefore the proposed multilevel inverter
can be used for variable speed drive application, which can be obtained by varying the frequency of multilevel
inverter. From the FFT analysis it can be inferred that when the number of levels are increased, the harmonics
and total harmonic distortion is reduced. Figure 10b shows THD value of proposed seven level inverter and it is
11.98%.
6. Comparison Results
Table 2 shows that the modified cascaded multilevel inverter involves only seven switches whereas
conventional inverter comprises twelve switches, but in both cases input voltage at each stage and output level
are same. Therefore the proposed modified cascaded multilevel inverter has less switching losses, simple control
circuit and less complexity than conventional cascaded multilevel inverter.
7. Experimental Verification
Simulation of modified cascaded multilevel inverter output voltage is verified by single phase hardware
prototype. Hardware prototype includes seven switches. Among those, three MOSFETs and three diodes are
made available for a multi conversion cell. This cell consists of three power stages. In each power stage, one
MOSFET (IRF250) and one diode are used as main switches, which are connected in modified configuration.
Each stage is supplied by a symmetrical DC source. A PIC 16F877 microcontroller is used as the main
processor, which provides gate logic signals. According to microcontroller control signal MOSFET gate
terminal is turned on and off. Output of the inverter terminal is connected to R load. The hardware block
diagram and prototype of modified cascaded multilevel inverter for a single leg are shown in Figure 11 and 12.
Hardware result of proposed multilevel inverter is exposed in Figure 13. The resultant voltage of seven level
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cascaded multilevel inverter is 9 volts, with frequency of 50 Hz.
8. Conclusion
This paper revealed that proposed modified multilevel inverter topology with reduced number of switches can
be implemented for industrial drive applications. This multilevel inverter structure and its basic operations have
been discussed elaborately. A detailed procedure for calculating required voltage level on each stage has been
conversed. As conventional seven level inverter involves twelve switches, it increases switching losses, cost and
circuit complexity The proposed inverter engages only seven switches with three diodes, which reduces
switching losses, cost and circuit complexity. Moreover it effectively diminishes lower order harmonics.
Therefore effective reduction of total harmonics distortion is achieved.
Appendix
Motor Details
Rotor Type: Wound
Power, Voltage and Frequency: 3730 W, 400 V and 50 Hz
Stator Resistance and Inductance: 1.115Ω and 0.005974Ω
Rotor Resistance and Inductance: 1.083Ω and 0.005947Ω
References
Franquelo, L.G., (2008), “The age of multilevel converters arrives”, IEEE Industrial Electronics Magazine,
Vol.2, No.2, 28-39.
Rodriguez, J., Lai, J.S. & Peng, F.Z., (2002) “Multilevel inverters: Survey of topologies, controls, and
applications”, IEEE Trans. Ind .Appl. Vol.49, No.4, 724-738.
Du, Z., Tolbert, L.M., Chiasson, J.N.& Opineci, B., (2006), “A cascaded multilevel inverter using a single dc
power source”, Proc. IEEE APEC, 426-430.
Fang Zheng Peng (2001), “A Generalized Multilevel Inverter Topology with Self Voltage Balancing”, IEEE
Trans. Ind .Appl. Vol.37, No.2.
Corzine, K.A., Wielebski, M.W., Peng, F.Z & Wang, J., (2004), “Control of cascaded multilevel inverters”,
IEEE Trans. Power Electron. Vol.19, No.3, 732-738.
Corzine, K.A., Hardick F.A, & Familiant, Y.L. (2003), “A cascaded multilevel inverter H-Bridge inverter
utilizing capacitor voltage source”, Proceeding of the IASTED International Conference on Power and Energy
Systems, pp.290-295.
Ismail, B., (2006), “Development of a Single Phase SPWM Microcontroller-Based Inverter”, First International
Power and Energy Conference PEC-IEEE, 28-29.
Patel, H.S. & Hoft, R.G., (1973), “Generalized Techniques of Harmonic Elimination and Voltage Control in
Thyristor Inverters: Part I – Harmonic Elimination”, IEEE Trans. Ind.Appl., 3, pp. 310-317.
Chiasson, J.N., Tolbert, L.M., Mckenzie, K.J. & Du Z., (2003), “Control of a Multilevel Converter Using
Resultant Theory”, IEEE Transactions Control System Theory, Vol. 11, No.3, pp. 345-354.
Chiasson, J.N. Tobert, L.M., McKenzie, K.J. & Du, Z., (2004), “A Unified Approach to Solving the Harmonic
Elimination Equations in Multilevel Converters”, IEEE Trans. Power Electron., Vol.19, No.2, pp. 478-490.
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Figure 1. Topology for Cascaded Multilevel Inverter
Figure 2. Typical Output Waveform for Cascaded Multilevel Inverter
Figure 3. Topology for Modified Cascaded Multilevel Inverter
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Figure 4. Typical Output Voltage Waveform of a Modified Cascaded Multilevel Inverter
Figure 5. Simulation Diagram for Modified Cascaded Multilevel Inverter for Induction Motor Drive
(a) (b)
Figure 6. Switching Pulses for (a) Switches S1, S2, S3, S4, S5 and S6 (b) Switches Q1-Q2 and Q3-Q4
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(a) (b)
Figure 7. Output Voltage Waveform for Single Phase (a) Line to Ground (b) Line to Line
(a) (b)
Figure 8. Output Voltage Waveform for Three Phase (a) Line to Ground (b) Line to Line
(a)
(b)
Figure 9. Modified Cascaded Multilevel Inverter fed Induction Motor (a) Speed Curve (b) Torque Curve
(a)
(b)
Figure 10. Modified Cascaded Multilevel Inverter fed Induction Motor (a) Stator Current (b) FFT Analysis
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Figure 11. Block Diagram for Modified Cascaded Multilevel Inverter
Figure 12. Experimental Setup of Modified Cascaded Multilevel Inverter
Figure 13. Hardware Output Waveform for Modified Cascaded Multilevel Inverter
Table 1. Basic Operation of Proposed Multilevel Inverter
Multi-conversion Cell H-Bridge
Voltage
S. No
On switches Off switches On switches Off switches levels
1 S1, S2, S3 D1,D2,D3 Q1,Q2 Q3,Q4 +3Vdc
2 S1, S2, D3 S3, D1,D2 Q1,Q2 Q3,Q4 +2Vdc
3 S1, D2, D3 S2, S3, D1 Q1,Q2 Q3,Q4 +1Vdc
4 D1, D2, D3 S1, S2, S3 Q1,Q2 Q3,Q4 0
5 S1, D2, D3 S2, S3, D1 Q3,Q4 Q1,Q2 -1Vdc
6 S1, S2, D3 S3, D1,D2 Q3,Q4 Q1,Q2 -2Vdc
7 S1, S2, S3 D1,D2,D3 Q3,Q4 Q1,Q2 -3Vdc
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Table 2. Comparison of Cascaded and Modified Cascaded Multilevel Inverter
Voltage level Number of Number of Number of switches
Name of Topology on each stage (S) output level switches used for 7 level
Cascaded Multilevel 1Vdc 2S+1 4S 12
Inverter
Modified Cascaded 1Vdc 2S+1 S+4 7
Multilevel Inverter
Biography
M.Murugesan was born in Anthiyur on December 27, 1986. He is graduated in 2009 from
Anna University, Chennai. He is post graduated M.E Power Electronics and Drives during 2011
from Anna University. He is currently working as Assistant professor at V.S.B Engineering
College. His area of interest involves in Power Electronics, inverter, modeling of induction
Motor. He is an ISTE life member. He has published more than 10 papers.
S. Sivaranjani was born in Tamilnadu, India, on March 30, 1980. She received B.E degree from
Bharathiyar University, in 2001. She also received M.E degree in Power Electronics and drives
during 2006 from Anna University, Chennai. She is having 9 years of teaching experience.
Currently she is doing Ph.D. Her current research interests include simulation and digital control
techniques of AC drives, Inverters topologies and harmonic suppression
G.Asokkumar was born in Erode on June 11, 1980. He is graduated in 2001 from
Bharathidhasan University Trichy. He also received M.E degree in Power Electronics and drives
during 2011 from Anna University, Chennai. His area of interest involves in Power Electronics,
BLDC Drives, inverter, modeling of induction Motor. He has published more than 8 papers
.
R.Sivakumar was born in Madurai on June 4, 1979. He is graduated in 2000 from
M.K.University, Madurai and post graduated in 2011 at Anna University of technology,
Trichy. . He is currently working as Assistant professor in the department of EEE at VSB
engineering College. Karur from April 2006. His research interest involves in power
electronics, inverter and modeling of wind turbine. He is an ISTE life member.
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