Drives are mainly categorized into constant-speed and variable-speed drives. AC machines have been used in constant-speed applications, where as DC machines were preferred for variable speed drives. Due to the advancement in power semiconductor devices and microprocessors, AC machines are widely used in variable speed drives. This paper focuses on the simulation and performance evaluation for an ac drive system with Induction motor and PMSM Motor. The focus was based on the simulation of the power circuits using MATLAB/SIMULINK software. The performance of inverter was studied by SVPWM technique. Space Vector Pulse Width Modulation (SVPWM) is a digital technique, which increases the output voltage capability and increases DC bus utilization voltage. The performance of an ac drive system was simulated and evaluated for variable speed operation from no load to rated speed under constant torque operation. The advantages and disadvantages of Induction motor and PMSM are analyzed and presented in this paper.
This paper presents simplified control strategy of Space Vector Pulse Width Modulation method including over modulation region with linear transfer characteristic for cascaded H-bridge inverters. Because of large number of switching states of the cascaded H- Bridge inverter, the over modulation operation is very complex. And also requires incorporation of both under modulation and over modulation algorithms. The proposed control method is effective in terms of selecting the optimal switching states with reduced computational complexity using simplified linear calculations which makes it easier for digital implementation. The performance of the proposed method is simulated and tested experimentally through Spartan 3A FPGA processor for five level Cascaded H-bridge Inverter. The simulation results and harmonic analysis of voltage and current at various modulation indexes as are presented which are in well agreement.
Direct torque control of IM using PID controller IJECEIAES
Direct torque control "DTC" technique is one of a high performance control system of an AC motor drive, which was proposed after the vector oriented control scheme during the resent 25 years. It has been developed rapidly for its concise system scheme, transient and dynamic performance. The DTC mechanism consists of voltage vector selection table, two hysteresis comparators and two estimator’s one for stator flux and another for electromagnetic torque. DTC is directly control torque and flux by using Voltage Source Inverter VSI, space vector and stator flux orientation and indirect speed regulated. A several control techniques can be used for improving the torque and flux performance. In this paper, the DTC with Proportional-Integral-Derivative (PID) controller used to improve the starting and dynamic performance of asynchronous motor AM, which gives good torque and flux response, best speed control and also minimize the unacceptable torque ripple. The mathematical model of DTC with PID controller of 3-phase induction motor IM are simulated under MatlabSimulink. Therefore, the DTC based on PID controller has good performance of IM compared to classical DTC for starting, running state and also during change in load.
Developing graphical user interface for analysis of beam by using matlab soft...eSAT Journals
Abstract Since Beam is an important member of any structure and carries heavy loads and hence before using beams one should have to be very sure about its shear strength and bending strength. Industrial beams have different types of support and structural properties. Various types of loads are acting on it like point loads, distributed loads etc. Shear stresses and bending moment should be within the material allowable limits and therefore analysis of beam is essential. In present work the analysis of beam is carried out by using GRAPHICAL USER INTERFACE (GUI) developed in software called MATLAB. This gives the package for high-performance numerical computation and visualization. Keywords: GUI, Reaction at support, Shear strength, Bending moment, SF graph, BM graph.
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).
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Multilevel inverter (MLI) is commonly utilized in direct torque control (DTC) for medium and high power applications. The additional voltage vectors generated by MLI can be manipulated to achieve the optimal selection for the inverter switching states in the DTC control systems. Previously, a review of DTC which focused more on the two-level inverter for induction motor as well as a review of the multilevel converter in industrial applications had been implemented individually. However, a review on DTC development in MLI was insufficient in both papers. Therefore, this paper aims to give a comprehensive review of the improvement of DTC via various MLI applications. It is reviewed according to the applicable multilevel inverter topologies in the DTC system. The comparison of DTC by using conventional and multilevel inverter is synthesized. Thus, this review paper will hopefully lead researchers in further research activities actively.
This paper presents simplified control strategy of Space Vector Pulse Width Modulation method including over modulation region with linear transfer characteristic for cascaded H-bridge inverters. Because of large number of switching states of the cascaded H- Bridge inverter, the over modulation operation is very complex. And also requires incorporation of both under modulation and over modulation algorithms. The proposed control method is effective in terms of selecting the optimal switching states with reduced computational complexity using simplified linear calculations which makes it easier for digital implementation. The performance of the proposed method is simulated and tested experimentally through Spartan 3A FPGA processor for five level Cascaded H-bridge Inverter. The simulation results and harmonic analysis of voltage and current at various modulation indexes as are presented which are in well agreement.
Direct torque control of IM using PID controller IJECEIAES
Direct torque control "DTC" technique is one of a high performance control system of an AC motor drive, which was proposed after the vector oriented control scheme during the resent 25 years. It has been developed rapidly for its concise system scheme, transient and dynamic performance. The DTC mechanism consists of voltage vector selection table, two hysteresis comparators and two estimator’s one for stator flux and another for electromagnetic torque. DTC is directly control torque and flux by using Voltage Source Inverter VSI, space vector and stator flux orientation and indirect speed regulated. A several control techniques can be used for improving the torque and flux performance. In this paper, the DTC with Proportional-Integral-Derivative (PID) controller used to improve the starting and dynamic performance of asynchronous motor AM, which gives good torque and flux response, best speed control and also minimize the unacceptable torque ripple. The mathematical model of DTC with PID controller of 3-phase induction motor IM are simulated under MatlabSimulink. Therefore, the DTC based on PID controller has good performance of IM compared to classical DTC for starting, running state and also during change in load.
Developing graphical user interface for analysis of beam by using matlab soft...eSAT Journals
Abstract Since Beam is an important member of any structure and carries heavy loads and hence before using beams one should have to be very sure about its shear strength and bending strength. Industrial beams have different types of support and structural properties. Various types of loads are acting on it like point loads, distributed loads etc. Shear stresses and bending moment should be within the material allowable limits and therefore analysis of beam is essential. In present work the analysis of beam is carried out by using GRAPHICAL USER INTERFACE (GUI) developed in software called MATLAB. This gives the package for high-performance numerical computation and visualization. Keywords: GUI, Reaction at support, Shear strength, Bending moment, SF graph, BM graph.
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).
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Multilevel inverter (MLI) is commonly utilized in direct torque control (DTC) for medium and high power applications. The additional voltage vectors generated by MLI can be manipulated to achieve the optimal selection for the inverter switching states in the DTC control systems. Previously, a review of DTC which focused more on the two-level inverter for induction motor as well as a review of the multilevel converter in industrial applications had been implemented individually. However, a review on DTC development in MLI was insufficient in both papers. Therefore, this paper aims to give a comprehensive review of the improvement of DTC via various MLI applications. It is reviewed according to the applicable multilevel inverter topologies in the DTC system. The comparison of DTC by using conventional and multilevel inverter is synthesized. Thus, this review paper will hopefully lead researchers in further research activities actively.
Artificial Neural Network Controller for Reducing the Total Harmonic Distorti...IJAEMSJORNAL
A neural network based space vector modulation (SVM) of voltage source inverter is proposed. The voltage source converter (VSC) is highly used in high voltage direct current (HVDC) transmission so that a detailed analysis and transmission of this system is carried out. In addition, a non-linear neural network controller is proposed to control the space vector pulse width modulation (SVPWM) to reduce the total harmonic distortion (THD) of the converter (inverter) output voltage. The inverter outputcurrent is analyzed with two switching frequency 1050Hz and1450Hz with and without proposed ANN controller. The results show a THD enhancement about 0.74 % for 1050Hz and 0.68 % for 1450Hz.
Field-Oriented Control of PMSM Drive Based on SVPWM Using MATLABIJERA Editor
The space vector PWM has the character of wide linear range, little higher harmonic and easy digital
realization. The FOC theory and SVPWM technique make the PMSM can achieve the performance as well as
DC motor. The mathematical model of PMSM is analyzed and the system model of FOC vector control has
been established. The control system has been also simulated by MATLAB/Simulink. The simulation results
accord with the real motor’s performance and provide the theory basis for the designing of real system.
Indirect 3D-Space Vector Modulation for a Matrix ConverterAhmed Mohamed
Ahmed Abdelrehim
Abstract—This paper discusses the indirect space vector
modulation for a four-leg matrix converter. The four-leg matrix
converter has been proven to be a reliable, cost-effective, and
compact power electronic interface to supply unbalanced or
nonlinear loads. However, the added fourth leg has shifted the
inverter side modulation from simple two-dimension SVM into
complex three-dimension. This paper employs a new technique to
implement indirect 3D SVM in digital controllers with further
simplification in the modulation process. Moreover, Simulink
simulation using repetitive controller has been performed to
regulate the output voltage for 400 Hz Power supplies.
This paper presents the combination of two different methods to perform the waveform analysis for PWM-operated inverter. The two techniques are Newton-Raphson method and Curve-Fitting as a PWM concept to operate PWM-based inverter, the proper solutions of switching angles can valuate the initial values by using the Newton-Raphson method with the wide-step calculation of modulation indices. The solutions are then compared using a curve in order to study the behavior. Then, the Curve-Fitting method is used to estimate the missing solutions between any points of wide-step calculation. This combination method can estimate the probable solutions that cannot be solved by Newton-Raphson method in a wide-ranging of the modulation index and reduce the calculation time. PWM-based inverter, which is obtained the switching angles by Newton-Raphson method and the combination of two different methods, is verified by the simulation results showing faster performance with improved Total Harmonic Distortion (THD) than both methods alone when compared the same values of switching angles.
Simulation of 3 Phase to 3 Phase Power Conversion Using Matrix Converter with...IJERA Editor
This paper proposes a new approach of design and implementation of 3 phase to 3 phase conversion using
matrix converter. It includes the design, modeling and implementation. The entire matrix converter circuits are
developed by mathematical model so as to reduce computational time and performances of the converter are
evaluated using MATLAB/SIMULINK for RL Load. The mathematical expressions relating the input and
output of the three phase matrix converter are implemented by using simulink block set. The duty cycles of the
matrix converter bidirectional switches are calculated using modified venturini algorithm for maximum (0.866)
and minimum (0.5) voltage transfer ratio.
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.
Sensitivity based optimal location of tcsc for improvement of power system se...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
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
MODELLING AND IMPLEMENTATION OF AN IMPROVED DSVM SCHEME FOR PMSM DTCpaperpublications3
Abstract: A very widely used drive strategy for PMSM is the field oriented control (FOC), which was proposed in 1971 for induction motors (IMs). However, the FOC scheme is quite complex due to the reference frame transformation and its high dependence upon the motor parameters and speed. To mitigate these problems, a new control strategy for the torque control of induction motor was developed by Takahashi known as the direct torque control (DTC) and by Depenbrock as the direct self control (DSC). The basic direct torque control (DTC) scheme may cause undesired torque, flux and current ripples because of the small number of applicable voltage vectors. The control system should be able to generate any voltage vector, implying the use of space vector modulation (SVM) which complicates the control scheme. The discrete space vector modulation (DSVM) method was proposed for DTC to overcome this problem which replaces the simple switching table by several switching tables, to apply a combination of three voltage vectors in the same sampling period. In this paper, after a brief review of the primary concept of DSVM DTC technique, a new scheme of DSVM DTC for PMSM is proposed with a new set of switching tables taking into account the motor speed and the absolute values of torque and flux feedback errors. In one fixed sampling time interval, three vectors are applied to the motor including the two null vectors. Comparisons of the basic DTC and the improved DSVM DTC schemes are made based on the system performance and switching loss. For this purpose the DSVM technique uses prefixed time intervals within a sampling cycle to synthesize a higher number of voltage vectors than the basic DTC scheme. A set of switching table is carried out to minimize the torque error. An optimal vector selector is developed to reduce the switching loss and make the system more stable. The sampling period does not need to be doubled in order to achieve a mean switching frequency practically equal to that of the basic DTC scheme. For a comparable performance, the switching loss of the proposed scheme is less than that of the basic DTC method. The vector application sequence is investigated and an optimal algorithm is developed to reduce the switching loss and torque ripple. Simulation and experiments on the improved DSVM DTC are carried out and compared with those on the basic DTC scheme.
Improvement of Voltage Quality of Micro Turbine Generator With Matrix Convert...IJERA Editor
In recent years, application of Distributed Generation (DG) sources has increased significantly. Micro turbine-Generator (MTG) is well suitable for different distributed generation applications, because it can be connected in parallel to serve larger loads, can provide reliable power and has low-emission. The main characteristics of MTG can be summarized in low maintenance, capacity of operation with liquid and gas fuels (including natural gas) and small area required for installation [1]. MTGs have the rated power from 30 to 250 kW, generating electricity in ac, and they can be installed in isolated conditions or synchronized with the electrical utility.MTGs are available as single-shaft or split-shaft units. Single-shaft unit is a high-speed synchronous machine with the compressor and turbine mounted on the same shaft. While, the split-shaft design uses a power turbine rotating at 3000 rpm and a conventional generator connected via a synchronous generator-PMSG), frequency converters (interface converters), and protection and control systems (Fig. 1)[1] . The interface converter is used to convert PMSG output voltage frequency (high frequency) to power system (50/60 Hz) frequency.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
Enhanced Performance of Matrix Converter using Adaptive Computing TechniquesIJERA Editor
This paper deals mainly with the improvement of linear load current profile considering different grid conditions. A popular power conversion circuit known to be a Matrix Converter was considered to study the effects on the quality of electrical power supply. This advanced converter configured with power semiconductor devices effectively optimizes the harmonic components of linear type loads with the aid of various controllers like PI, Fuzzy, Adaptive Fuzzy and ANFIS models. The simulation studies and subsequent comparisons are derived for the proposed system on MATLAB/SIMULINK package under balanced and distorted grid conditions
An Implementation Mechanisms of SVM Control Strategies Applied to Five Levels...IJPEDS-IAES
In the area of the energy control with high voltage and power, the multilevel inverters constitute a relatively recent research orientation. The current applications of this technology are in the domains of the high voltage (over hundred kV), variable speed drives, transport and distribution of a good quality of electrical energy (HVDC, FACTS system, ....). To improve the output voltage for such inverters, many different modulation strategies have been developed. Among these strategies, the SVM (Space Vector Modulation). The technique provide the nearest switching vectors sequence to the reference vector without involving trigonometric functions and provide the additional advantages of superior harmonic quality. In this paper, we analyze different mechanisms of the output voltage synthesis and the problem of even order harmonic production. With the proposed a new trajectory SVM, which can eliminate all the even order harmonics for five levels inverter. Show clearly how to deduce the trajectories from the sequences allowing to have better performances among several possible trajectories. It is dedicated to the application of two particular trajectories.
Comparative analysis of singularities of 3 prs and 3-prs parallel manipulator...eSAT Journals
Abstract
Grassmann-Cayley Algebra (GCA) is a symbolic approach to Plücker coordinates lines. It is used to write expressions for
geometric incidences in projective geometry.GCA gives a useful way to analyze mechanism singularity without algebraic
coordinate expression. Since it has great powerful tools for coordinate’s free representation, geometric interpretation and
singularity analyzing in real time computing, this method is implemented in the present research. The goal of this study is finding
the singularities conditions of 3-PRS Parallel Manipulators (PMs) based on GCA when the position of the actuators is firstly on
prismatic joints and secondly on revolute joints. Geometric method of reciprocal screw is used to formulate the Global Wrench
System (GWS) of the PMs. GWS represents the determinant of Jacobian matrix which rows are Plücker coordinate lines. The
degeneracy analysis of determinant of this matrix based on the dependency notion of Plücker coordinate lines is performed in
coordinate free expressions and provides double and single singularities conditions, respectively for3-PRS and 3-PRS PMs,
which contains all generals and specials cases. The keys elements of transition between the rows of Jacobian matrix and
singularity condition are the introduction of Plücker lines, superbrackets, join and meet operators. The vanishing points of these
superbrackets decomposition are analyzed to describe the singularity conditions associated with different motions. The results
indicate that for the 3-PRS and 3-PRS PMs, a common singularity occurs when the three constraints forces of the mobile platform
lie on the common plane and intersect at a unique point. It is suggested that both position and orientation of the actuator have to
be integrated in the conceptual design stage in order to optimize the rigidity frame of the mechanism.
Key Words: Singularity, 3-PRS Parallel Manipulators, Grassmann-Cayley Algebra, Projective space, Wrench graph.
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
Hardware Implementation of SPWM Based Diode Clamped Multilevel Invertrrahulmonikasharma
This paper present three phase three level diode clamped multi level inverter. The control technique used here is sine pulse width modulation. The inverter can reduce the harmonic components compared with that of traditional full-bridge inverter under the condition of identical supply DC voltage and switching frequency. Here this paper presents a operational principles and switching functions are analyzed. The proposed inverter improves the dynamic performances Inverter is simulated using MATLAB/SIMULINK FFT analysis has been done. Proto type hardware is developed in laboratory and simulation results are compared with experimental results. Voltage to frequency control in open loop for three phase induction motor has also been done.
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.
Artificial Neural Network Controller for Reducing the Total Harmonic Distorti...IJAEMSJORNAL
A neural network based space vector modulation (SVM) of voltage source inverter is proposed. The voltage source converter (VSC) is highly used in high voltage direct current (HVDC) transmission so that a detailed analysis and transmission of this system is carried out. In addition, a non-linear neural network controller is proposed to control the space vector pulse width modulation (SVPWM) to reduce the total harmonic distortion (THD) of the converter (inverter) output voltage. The inverter outputcurrent is analyzed with two switching frequency 1050Hz and1450Hz with and without proposed ANN controller. The results show a THD enhancement about 0.74 % for 1050Hz and 0.68 % for 1450Hz.
Field-Oriented Control of PMSM Drive Based on SVPWM Using MATLABIJERA Editor
The space vector PWM has the character of wide linear range, little higher harmonic and easy digital
realization. The FOC theory and SVPWM technique make the PMSM can achieve the performance as well as
DC motor. The mathematical model of PMSM is analyzed and the system model of FOC vector control has
been established. The control system has been also simulated by MATLAB/Simulink. The simulation results
accord with the real motor’s performance and provide the theory basis for the designing of real system.
Indirect 3D-Space Vector Modulation for a Matrix ConverterAhmed Mohamed
Ahmed Abdelrehim
Abstract—This paper discusses the indirect space vector
modulation for a four-leg matrix converter. The four-leg matrix
converter has been proven to be a reliable, cost-effective, and
compact power electronic interface to supply unbalanced or
nonlinear loads. However, the added fourth leg has shifted the
inverter side modulation from simple two-dimension SVM into
complex three-dimension. This paper employs a new technique to
implement indirect 3D SVM in digital controllers with further
simplification in the modulation process. Moreover, Simulink
simulation using repetitive controller has been performed to
regulate the output voltage for 400 Hz Power supplies.
This paper presents the combination of two different methods to perform the waveform analysis for PWM-operated inverter. The two techniques are Newton-Raphson method and Curve-Fitting as a PWM concept to operate PWM-based inverter, the proper solutions of switching angles can valuate the initial values by using the Newton-Raphson method with the wide-step calculation of modulation indices. The solutions are then compared using a curve in order to study the behavior. Then, the Curve-Fitting method is used to estimate the missing solutions between any points of wide-step calculation. This combination method can estimate the probable solutions that cannot be solved by Newton-Raphson method in a wide-ranging of the modulation index and reduce the calculation time. PWM-based inverter, which is obtained the switching angles by Newton-Raphson method and the combination of two different methods, is verified by the simulation results showing faster performance with improved Total Harmonic Distortion (THD) than both methods alone when compared the same values of switching angles.
Simulation of 3 Phase to 3 Phase Power Conversion Using Matrix Converter with...IJERA Editor
This paper proposes a new approach of design and implementation of 3 phase to 3 phase conversion using
matrix converter. It includes the design, modeling and implementation. The entire matrix converter circuits are
developed by mathematical model so as to reduce computational time and performances of the converter are
evaluated using MATLAB/SIMULINK for RL Load. The mathematical expressions relating the input and
output of the three phase matrix converter are implemented by using simulink block set. The duty cycles of the
matrix converter bidirectional switches are calculated using modified venturini algorithm for maximum (0.866)
and minimum (0.5) voltage transfer ratio.
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.
Sensitivity based optimal location of tcsc for improvement of power system se...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
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
MODELLING AND IMPLEMENTATION OF AN IMPROVED DSVM SCHEME FOR PMSM DTCpaperpublications3
Abstract: A very widely used drive strategy for PMSM is the field oriented control (FOC), which was proposed in 1971 for induction motors (IMs). However, the FOC scheme is quite complex due to the reference frame transformation and its high dependence upon the motor parameters and speed. To mitigate these problems, a new control strategy for the torque control of induction motor was developed by Takahashi known as the direct torque control (DTC) and by Depenbrock as the direct self control (DSC). The basic direct torque control (DTC) scheme may cause undesired torque, flux and current ripples because of the small number of applicable voltage vectors. The control system should be able to generate any voltage vector, implying the use of space vector modulation (SVM) which complicates the control scheme. The discrete space vector modulation (DSVM) method was proposed for DTC to overcome this problem which replaces the simple switching table by several switching tables, to apply a combination of three voltage vectors in the same sampling period. In this paper, after a brief review of the primary concept of DSVM DTC technique, a new scheme of DSVM DTC for PMSM is proposed with a new set of switching tables taking into account the motor speed and the absolute values of torque and flux feedback errors. In one fixed sampling time interval, three vectors are applied to the motor including the two null vectors. Comparisons of the basic DTC and the improved DSVM DTC schemes are made based on the system performance and switching loss. For this purpose the DSVM technique uses prefixed time intervals within a sampling cycle to synthesize a higher number of voltage vectors than the basic DTC scheme. A set of switching table is carried out to minimize the torque error. An optimal vector selector is developed to reduce the switching loss and make the system more stable. The sampling period does not need to be doubled in order to achieve a mean switching frequency practically equal to that of the basic DTC scheme. For a comparable performance, the switching loss of the proposed scheme is less than that of the basic DTC method. The vector application sequence is investigated and an optimal algorithm is developed to reduce the switching loss and torque ripple. Simulation and experiments on the improved DSVM DTC are carried out and compared with those on the basic DTC scheme.
Improvement of Voltage Quality of Micro Turbine Generator With Matrix Convert...IJERA Editor
In recent years, application of Distributed Generation (DG) sources has increased significantly. Micro turbine-Generator (MTG) is well suitable for different distributed generation applications, because it can be connected in parallel to serve larger loads, can provide reliable power and has low-emission. The main characteristics of MTG can be summarized in low maintenance, capacity of operation with liquid and gas fuels (including natural gas) and small area required for installation [1]. MTGs have the rated power from 30 to 250 kW, generating electricity in ac, and they can be installed in isolated conditions or synchronized with the electrical utility.MTGs are available as single-shaft or split-shaft units. Single-shaft unit is a high-speed synchronous machine with the compressor and turbine mounted on the same shaft. While, the split-shaft design uses a power turbine rotating at 3000 rpm and a conventional generator connected via a synchronous generator-PMSG), frequency converters (interface converters), and protection and control systems (Fig. 1)[1] . The interface converter is used to convert PMSG output voltage frequency (high frequency) to power system (50/60 Hz) frequency.
Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.
Enhanced Performance of Matrix Converter using Adaptive Computing TechniquesIJERA Editor
This paper deals mainly with the improvement of linear load current profile considering different grid conditions. A popular power conversion circuit known to be a Matrix Converter was considered to study the effects on the quality of electrical power supply. This advanced converter configured with power semiconductor devices effectively optimizes the harmonic components of linear type loads with the aid of various controllers like PI, Fuzzy, Adaptive Fuzzy and ANFIS models. The simulation studies and subsequent comparisons are derived for the proposed system on MATLAB/SIMULINK package under balanced and distorted grid conditions
An Implementation Mechanisms of SVM Control Strategies Applied to Five Levels...IJPEDS-IAES
In the area of the energy control with high voltage and power, the multilevel inverters constitute a relatively recent research orientation. The current applications of this technology are in the domains of the high voltage (over hundred kV), variable speed drives, transport and distribution of a good quality of electrical energy (HVDC, FACTS system, ....). To improve the output voltage for such inverters, many different modulation strategies have been developed. Among these strategies, the SVM (Space Vector Modulation). The technique provide the nearest switching vectors sequence to the reference vector without involving trigonometric functions and provide the additional advantages of superior harmonic quality. In this paper, we analyze different mechanisms of the output voltage synthesis and the problem of even order harmonic production. With the proposed a new trajectory SVM, which can eliminate all the even order harmonics for five levels inverter. Show clearly how to deduce the trajectories from the sequences allowing to have better performances among several possible trajectories. It is dedicated to the application of two particular trajectories.
Comparative analysis of singularities of 3 prs and 3-prs parallel manipulator...eSAT Journals
Abstract
Grassmann-Cayley Algebra (GCA) is a symbolic approach to Plücker coordinates lines. It is used to write expressions for
geometric incidences in projective geometry.GCA gives a useful way to analyze mechanism singularity without algebraic
coordinate expression. Since it has great powerful tools for coordinate’s free representation, geometric interpretation and
singularity analyzing in real time computing, this method is implemented in the present research. The goal of this study is finding
the singularities conditions of 3-PRS Parallel Manipulators (PMs) based on GCA when the position of the actuators is firstly on
prismatic joints and secondly on revolute joints. Geometric method of reciprocal screw is used to formulate the Global Wrench
System (GWS) of the PMs. GWS represents the determinant of Jacobian matrix which rows are Plücker coordinate lines. The
degeneracy analysis of determinant of this matrix based on the dependency notion of Plücker coordinate lines is performed in
coordinate free expressions and provides double and single singularities conditions, respectively for3-PRS and 3-PRS PMs,
which contains all generals and specials cases. The keys elements of transition between the rows of Jacobian matrix and
singularity condition are the introduction of Plücker lines, superbrackets, join and meet operators. The vanishing points of these
superbrackets decomposition are analyzed to describe the singularity conditions associated with different motions. The results
indicate that for the 3-PRS and 3-PRS PMs, a common singularity occurs when the three constraints forces of the mobile platform
lie on the common plane and intersect at a unique point. It is suggested that both position and orientation of the actuator have to
be integrated in the conceptual design stage in order to optimize the rigidity frame of the mechanism.
Key Words: Singularity, 3-PRS Parallel Manipulators, Grassmann-Cayley Algebra, Projective space, Wrench graph.
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
Hardware Implementation of SPWM Based Diode Clamped Multilevel Invertrrahulmonikasharma
This paper present three phase three level diode clamped multi level inverter. The control technique used here is sine pulse width modulation. The inverter can reduce the harmonic components compared with that of traditional full-bridge inverter under the condition of identical supply DC voltage and switching frequency. Here this paper presents a operational principles and switching functions are analyzed. The proposed inverter improves the dynamic performances Inverter is simulated using MATLAB/SIMULINK FFT analysis has been done. Proto type hardware is developed in laboratory and simulation results are compared with experimental results. Voltage to frequency control in open loop for three phase induction motor has also been done.
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.
SPEED CONTROL OF INDUCTION MACHINE WITH REDUCTION IN TORQUE RIPPLE USING ROBU...IAEME Publication
In this paper a novel and simple algorithm for three-phase induction motor(IM) under Direct Torque Control (DTC) scheme using Classic DTC switching table for dynamic torque ripple reduction and space-vector modulation scheme for steady state torque and flux control is proposed. The proposed scheme having the advantages of low torque ripples as well as constant switching frequency.
Simulation results are given to prove the ability of the proposed method obtaining good speed control bandwidth while overcoming classic DTC and DTC-SVM drawbacks.
Review of Improved Direct Torque Control Methodologies for Induction Motor Dr...AM Publications
ecoupled control of induction motor drives is possible using Direct Torque Control (DTC) method which
is very simple control strategy compared to field oriented control. In this method direct torque control is achieved by
selecting suitable inverter switching voltage vector from a lookup table. But drawback of this method is that it
produces toque ripples. Also the switching frequency of inverter switches is not constant. Many methods have been
proposed to address these issues of DTC. This paper reviews various methodologies which are suggested to improve
performance of basic DTC induction motor drive.
In this paper both DC-DC Converter and multilevel inverter have been proposed. The proposed multilevel inverter with appropriate gate signals generates seven level AC output voltage. Also, with the implementation of Low Pass Filter, the output voltage’s Total Harmonic Distortion is reduced. Not only switching losses but also voltage stress of switches can be reduced. With the help of Sinusoidal Pulse-Width Modulation (SPWM) switches of the inverters are controlled. Finally, a laboratory prototype has been implemented and from experimental results, the seven level output of implemented inverter can be inferred.
Optimization techniques for harmonics minimization in cascaded hybrid multile...eSAT Journals
Abstract
Recent advancements in the field of power electronics have made possible the worldwide application of converters in dc power source utilization, uninterruptible power supplies, electric motor speed control, switched mode power supplies, flexible alternating current transmission systems devices including static synchronous compensator and their controls. Power semiconductor devices such as converters have been emerged as powerful devices in the power industries. As such, harmonics free output of inverters is assuming extreme importance. Over the past decades, depending upon the topologies and control strategies, numerous optimization techniques have been proposed for desired output waveform. This paper presents a review of optimization techniques used for multilevel inverters. The pros and cons of optimization techniques are discussed. The objective of these optimization techniques is to find out the optimum firing angles of multilevel inverters, which results in minimum harmonics. As a preferred option for proposed work, reduction of total harmonic distortion with the aid of particle swarm optimization technique to multilevel inverters is suggested.
Keywords: Power Converters, Multilevel Inverters (MLI), Cascaded Hybrid Bridge (CHB), Modulation, Switching Frequency, Harmonic Distortions.
Simulation Of A 4-Switch,3-Phase Inverter Fed Induction Motor (IM) Drive Systemijiert bestjournal
This paper investigates the performance of a 4 - switch,3 - phase inverter (4S3P) fed cost effective induction motor (IM)drive system for high performance industrial drive systems. In the proposed approach,instead of a conventional 6 - switch,3 - phase inverter (6S3P) a 4 - switch,3 - phase inverter is utilized. This reduces the cost of the inverter,the switching losses,and the complexity of the control algorithms and interface circuits to generate 6PWM logic signals. The Simulation results of the proposed 4S3P inverter fed drive is also made in terms of speed response &total harmonic distortion (THD) in terms of stator current and inverter current. The proposed inverter fed IM drive is fou nd acceptable considering its cost reduction and other advantageous features. A general space vector pulse width modulation (SVPWM) method for control of four - switch three - phase inverters is presented.
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
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
Review of the DTC Controller and Estimation of Stator Resistance in IM DrivesIAES-IJPEDS
In recent years an advanced control method called direct torque control
(DTC) has gained importance due to its capability to produce fast torque
control of induction motor. Although in these systems such variables as
torque, flux modulus and flux sector are required, resulting DTC structure is
particularly simplistic. Conventional DTC does not require any mechanical
sensor or current regulator and coordinate transformation is not present, thus
reducing the complexity. Fast and good dynamic performances and
robustness has made DTC popular and is now used widely in all industrial
applications. Despite these advantages it has some disadvantages such as
high torque ripple and slow transient response to step changes during start
up. Torque ripple in DTC is because of hysteresis controller for stator flux
linkage and torque. The ripples can be reduced if the errors of the torque and
the flux linkage and the angular region of the flux linkage are subdivided into
several smaller subsections. Since the errors are divided into smaller sections
different voltage vector is selected for small difference in error, thus a more
accurate voltage vector is selected and hence the torque and flux linkage
errors are reduced. The stator resistance changes due to change in
temperature during the operation of machine. At high speeds, the stator
resistance drop is small and can be neglected. At low speeds, this drop
becomes dominant. Any change in stator resistance gives wrong estimation
of stator flux and consequently of the torque and flux. Therefore, it is
necessary to estimate the stator resistance correctly. This paper aims to
review some of the control techniques of DTC drives and stator resistance
estimation methods.
Design of a wind power generation system using a permanent magnet synchronous...eSAT Journals
Abstract This paper presents a wind power system using a Permanent Magnet Synchronous Machine (PMSM). The whole system consists of a wind turbine, a permanent magnet synchronous machine, a three phase diode rectifier, a boost converter, a transformer-less step down circuit, an H-bridge inverter and a T-LCL filter. The 3-phase AC output from the PMSM is sent to the 3-phase diode rectifier for conversion to DC and a boost regulator is used to step-up this DC voltage to the desired level. This step-upped DC voltage is then converted into AC output by the H-Bridge inverter. The switching technique of the proposed inverter consists of a combination of Sinusoidal Pulse Width Modulation (SPWM) and a square wave along with grid synchronization conditions. As the suggested method is entirely transformer-less, it significantly reduces Total Harmonic Distortion (THD) to less than 0.1% and minimizes its size. The T-LCL Immittance Converter not only reduces the harmonics of the inverter output but also provides a nearly constant output current thereby stabilizing the system. The system setup and the simulation results were obtained using the PSIM software. Keywords: Wind Turbine, Permanent Magnet Synchronous Machine, Boost Converter, Step- down Circuit, T-LCL Immittance Converter, Inverter
Fast svm based 3 phase cascaded five level invertereSAT Journals
Abstract Introduction of nearest three vector algorithm is a major achievement in the area of space vector technology. Complexity and severe computations are still the drawbacks of SVM methods mainly for multilevel inverter applications. A fast SVM technique is introduced in this project which allows the calculation of switch time duration and the efficient determination of switching times based on the two level inverter scheme. SVM modulating waves are generated based on the two level system and then this modulating waves are compared with required number of carrier signals in order to generate the switching pulses for the inverter. Four triangular carrier signals are needed for a five level system in order to generate the switching pulses. Coordinates of the nearest three voltage vectors is not needed, so the complexity of the SVM technique can be reduced and it is the major advantage of the proposed technique compared with conventional SVM techniques used for multilevel inverters. A three phase five level cascaded H bridge topology is used here to verify the effectiveness of the proposed technique. MATLAB simulation and hardware implementation of the proposed system is done. From the analysis of both simulation and hardware it is clear that proposed SVM technique have more fundamental output and less THD than sinusoidal PWM technique. Key Words: Cascaded H bridge, Multilevel, Modulating wave, Space vector
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.
Double flux orientation control for a doubly fed induction generator based wi...eSAT Journals
Abstract
Abstract In this paper we present a new strategy of vector control for variable speed wind turbines (WT) based on Doubly-Fed
Induction Generator (DFIG). It is based on the principle of a double flux orientation (DFOC) of stator and rotor at the same time.
This one creates the orthogonally between the two oriented fluxes, which must be strictly observed, and therefore leads to generate a
linear and decoupled control of the active and reactive powers. The simulation was performed using Simulink of Matlab to show the
effectiveness of the proposed control strategy.
Index Terms: Doubly fed induction generator (DFIG), wind turbine (WT), double flux Orientation control, vector control.
Similar to Simulation and Performance of AC Drives Using SVPWM Technique (20)
Data Mining is a significant field in today’s data-driven world. Understanding and implementing its concepts can lead to discovery of useful insights. This paper discusses the main concepts of data mining, focusing on two main concepts namely Association Rule Mining and Time Series Analysis
A Review on Real Time Integrated CCTV System Using Face Detection for Vehicle...rahulmonikasharma
We are describes the technique for real time human face detection and counting the number of passengers in vehicle and also gender of the passengers.The Image processing technology is very popular,now at present all are going to use it for various purpose. It can be applied to various applications for detecting and processing the digital images. Face detection is a part of image processing. It is used for finding the face of human in a given area. Face detection is used in many applications such as face recognition, people tracking, or photography. In this paper,The webcam is installed in public vehicle and connected with Raspberry Pi model. We use face detection technique for detecting and counting the number of passengers in public vehicle via webcam with the help of image processing and Raspberry Pi.
Considering Two Sides of One Review Using Stanford NLP Frameworkrahulmonikasharma
Sentiment analysis is a type of natural language processing for tracking the mood of the public about a particular product or a topic and is useful in several ways. Polarity shift is the most classical task which aims at classifying the reviews either positive or negative. But in many cases, in addition to the positive and negative reviews, there still many neutral reviews exist. However, the performance sometimes limited due to the fundamental deficiencies in handling the polarity shift problem. We propose an Improvised Dual Sentiment Analysis (IDSA) model to address this problem for sentiment classification. We first propose a novel data expansion technique by creating sentiment-reversed review for each training and test review. We develop a corpus based method to construct a pseudo-antonym dictionary. It removes DSA’s dependency on an external antonym dictionary for review reversion. We conduct a range of experiments and the results demonstrates the effectiveness of DSA in addressing the polarity shift in sentiment classification. .
A New Detection and Decoding Technique for (2×N_r ) MIMO Communication Systemsrahulmonikasharma
The requirements of fifth generation new radio (5G- NR) access networks are very high capacity and ultra-reliability. In this paper, we proposed a V-BLAST2 × N_r MIMO system that is analyzed, improved, and expected to achieve both very high throughput and ultra- reliability simultaneously.A new detection technique called parallel detection algorithm is proposed. The performance of the proposed algorithm compared with existing linear detection algorithms. It was seen that the proposed technique increases the speed of signal transmission and prevents error propagation which may be present in serial decoding techniques. The new algorithm reduces the bit error probability and increases the capacity simultaneouslywithout using a standard STC technique. However, it was seen that the BER of systems using the proposed algorithm is slightly higher than a similar system using only STC technique. Simulation results show the advantages of using the proposed technique.
Broadcasting Scenario under Different Protocols in MANET: A Surveyrahulmonikasharma
A wireless network enables people to communicate and access applications and information without wires. This provides freedom of movement and the ability to extend applications to different parts of a building, city, or nearly anywhere in the world. Wireless networks allow people to interact with e-mail or browse the Internet from a location that they prefer. Adhoc Networks are self-organizing wireless networks, absent any fixed infrastructure. broadcasting of data through proper channel is essential. Various protocols are designed to avoid the loss of data. In this paper an overview of different broadcast protocols are discussed.
Sybil Attack Analysis and Detection Techniques in MANETrahulmonikasharma
Security is important for many sensor network applications. A particularly harmful attack against sensor and ad hoc networks is known as the Sybil attack [6], where a node Illegitimately claims multiple identities.Mobility cause a main problem when we talk about security in Mobile Ad-hoc networks. It doesn’t depend on fixed architecture, the nodes are continuously moving in a random fashion. In this article we will focus on identifying the Sybil attack in MANET. It uses air medium for communication so it is more prone to the attack. Sybil attack is one in which single node present multiple fake identities to other nodes, which cause destruction.
A Landmark Based Shortest Path Detection by Using A* and Haversine Formularahulmonikasharma
In 1900, less than 20 percent of the world populace lived in cities, in 2007, fair more than 50 percent of the world populace lived in cities. In 2050, it has been anticipated that more than 70 percent of the worldwide population (about 6.4 billion individuals) will be city tenants. There's more weight being set on cities through this increment in population [1]. With approach of keen cities, data and communication technology is progressively transforming the way city regions and city inhabitants organize and work in reaction to urban development. In this paper, we create a nonspecific plot for navigating a route throughout city A asked route is given by utilizing combination of A* Algorithm and Haversine equation. Haversine Equation gives least distance between any two focuses on spherical body by utilizing latitude and longitude. This least distance is at that point given to A* calculation to calculate minimum distance. The method for identifying the shortest path is specify in this paper.
Processing Over Encrypted Query Data In Internet of Things (IoTs) : CryptDBs,...rahulmonikasharma
Internet of Things (IoT) is the developing technologies that would be the biggest agents to modify the current world. Machine-to-machine communications perform with virtual, mobile and instantaneous connections. In IoT system, it consists of data-gathering sensors various other household devices. Intended for protecting IoT system, the end-to-end secure communication is a necessary measure to protect against unauthorized entities (e.g., modification attacks and eavesdropping,) and the data unprotected on the Cloud. The most important concern hereby is how to preserve the insightful information and to provide the privacy of user data. In IoT, the encrypted data computing is based on techniques appear to be promising approaches. In this paper, we discuss about the recent secure database systems, which are capable to execute SQL queries over encrypted data.
Quality Determination and Grading of Tomatoes using Raspberry Pirahulmonikasharma
In India cultivation of tomatoes is carried out by traditional methods and techniques. Today tremendous improvement in field of agriculture technologies and products can be seen. The tomatoes affect the overall production drastically. Image processing technique can be key technique for finding good qualities of tomatoes and grading. This work aimed to study different types of algorithms used for quality grading and sorting of fruit from the acquire image. In previous years several types of techniques are applied to analyses the good quality fruits. A simple system can be implemented using Raspberry pi with computer vision technology and image processing algorithms.
Comparative of Delay Tolerant Network Routings and Scheduling using Max-Weigh...rahulmonikasharma
Network management and Routing is supportively done by performing with the nodes, due to infrastructure-less nature of the network in Ad hoc networks or MANET. The nodes are maintained itself from the functioning of the network, for that reason the MANET security challenges several defects. Routing process and Scheduling is a significant idea to enhance the security in MANET. Other than, scheduling has been recognized to be a key issue for implementing throughput/capacity optimization in Ad hoc networks. Designed underneath conventional (LT) light tailed assumptions, traffic fundamentally faces Heavy-tailed (HT) assumption of the validity of scheduling algorithms. Scheduling policies are utilized for communication networks such as Max-Weight, backpressure and ACO, which are provably throughput optimality and the Pareto frontier of the feasible throughput region under maximal throughput vector. In wireless ad-hoc network, the issue of routing and optimal scheduling performs with time varying channel reliability and multiple traffic streams. Depending upon the security issues within MANETs in this paper presents a comparative analysis of existing scheduling policies based on their performance to progress the delay performance in most scenarios. The security issues of MANETs considered from this paper presents a relative analysis of existing scheduling policies depend on their performance to progress the delay performance in most developments.
DC Conductivity Study of Cadmium Sulfide Nanoparticlesrahulmonikasharma
The dc conductivity of consolidated nanoparticle of CdS has been studied over the temperature range from 303 K to 523 K and the conductivity has been found to be much larger than that of single crystals.
A Survey on Peak to Average Power Ratio Reduction Methods for LTE-OFDMrahulmonikasharma
OFDM (Orthogonal Frequency Division Multiplexing) is generally preferred for high data rate transmission in digital communication. The Long-Term Evolution (LTE) standards for the fourth generation (4G) wireless communication systems. Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (SC-FDMA) are the two multiple access techniques which are generally used in LTE.OFDM system has a major shortcoming of high peak to average power ratio (PAPR) value. This paper explains different PAPR reduction techniques and presents a comparison of the various techniques based on theoretical results. It also presents a survey of the various PAPR reduction techniques and the state of the art in this area.
IOT Based Home Appliance Control System, Location Tracking and Energy Monitoringrahulmonikasharma
Home automation has been a dream of sciences for so many years. It could wind up conceivable in twentieth century simply after power all family units and web administrations were begun being utilized on across the board level. The point of home robotization is to give enhanced accommodation, comfort, vitality effectiveness and security. Vitality checking and protection holds prime significance in this day and age in view of the irregularity between control age and request observing frameworks accessible in the market. Ordinarily, customers are disappointed with the power charge as it doesn't demonstrate the power devoured at the gadget level. This paper shows the outline and execution of a vitality meter utilizing Arduino microcontroller which can be utilized to gauge the power devoured by any individual electrical apparatus. The primary expectation of the proposed vitality meter is to screen the power utilization at the gadget level, transfer it to the server and build up remote control of any apparatus. So we can screen the power utilization remotely and close down gadgets if vital. The car segment is additionally one of the application spaces where vehicle can be made keen by utilizing "IOT". So a vehicle following framework is additionally executed to screen development of vehicles remotely.
Thermal Radiation and Viscous Dissipation Effects on an Oscillatory Heat and ...rahulmonikasharma
An anticipated outcome that is intended chapter is to investigate effects of magnetic field on an oscillatory flow of a viscoelastic fluid with thermal radiation, viscous dissipation with Ohmic heating which bounded by a vertical plane surface, have been studied. Analytical solutions for the quasi – linear hyperbolic partial differential equations are obtained by perturbation technique. Solutions for velocity and temperature distributions are discussed for various values of physical parameters involving in the problem. The effects of cooling and heating of a viscoelastic fluid compared to the Newtonian fluid have been discussed.
Advance Approach towards Key Feature Extraction Using Designed Filters on Dif...rahulmonikasharma
In fast growing database repository system, image as data is one of the important concern despite text or numeric. Still we can’t replace test on any cost but for advancement, information may be managed with images. Therefore image processing is a wide area for the researcher. Many stages of processing of image provide researchers with new ideas to keep information safe with better way. Feature extraction, segmentation, recognition are the key areas of the image processing which helps to enhance the quality of working with images. Paper presents the comparison between image formats like .jpg, .png, .bmp, .gif. This paper is focused on the feature extraction and segmentation stages with background removal process. There are two filters, one is integer filter and second one is floating point Filter, which is used for the key feature extraction from image. These filters applied on the different images of different formats and visually compare the results.
Alamouti-STBC based Channel Estimation Technique over MIMO OFDM Systemrahulmonikasharma
The examination on various looks into on MIMO STBC framework in order to accomplish the higher framework execution is standard that the execution of the remote correspondence frameworks can be improved by usage numerous transmit and get radio wires, that is normally gathered on the grounds that the MIMO procedure, and has been incorporated. The Alamouti STBC might be a promising because of notice the pick up inside the remote interchanges framework misuse MIMO. To broaden the code rate and furthermore the yield of the symmetrical zone time square code for more than 4 transmit reception apparatuses is examined. The outlined framework is beated once forced with M-PSK (i.e upto 32-PSK) regulation. The channel estimation examine in these conditions.
Empirical Mode Decomposition Based Signal Analysis of Gear Fault Diagnosisrahulmonikasharma
A vibration investigation is about the specialty of searching for changes in the vibration example, and after that relating those progressions back to the machines mechanical outline. The level of vibration and the example of the vibration reveal to us something about the interior state of the turning segment. The vibration example can let us know whether the machine is out of adjust or twisted. Al-so blames with the moving components and coupling issues can be distinguished. This paper shows an approach for equip blame investigation utilizing signal handling plans. The information has been taken from college of ohio, joined states. The investigation has done utilizing MATLAB software.
This paper discusses a new algorithm of a univariate method, which is vitally important to develop a short-term load forecasting module for planning and operation of distribution system. It has many applications including purchasing of energy, generation and infrastructure development etc. We have discussed different time series forecasting approaches in this paper. But ARIMA has proved itself as the most appropriate method in forecasting of the load profile for West Bengal using the historical data of the year of 2017. Auto Regressive Integrated Moving Average model gives more accuracy level of load forecast than any other techniques. Mean Absolute Percentage Error (MAPE) has been calculated for the mentioned forecasted model.
Impact of Coupling Coefficient on Coupled Line Couplerrahulmonikasharma
The coupled line coupler is a type of directional coupler which finds practical utility. It is mainly used for sampling the microwave power. In this paper, 3 couplers A,B & C are designed with different values of coupling coefficient 6dB,10dB & 18dB respectively at a frequency of 2.5GHz using ADS tool. The return loss, isolation loss & transmission loss are determined. The design & simulation is done using microstrip line technology.
Design Evaluation and Temperature Rise Test of Flameproof Induction Motorrahulmonikasharma
The ignition of flammable gases, vapours or dust in presence of oxygen contained in the surrounding atmosphere may lead to explosion. Flameproof three phase induction motors are the most common and frequently used in the process industries such as oil refineries, oil rigs, petrochemicals, fertilizers, etc. The design of flameproof motor is such that it allows and sustain explosion within the enclosure caused by ignition of hazardous gases without transmitting it to the external flammable atmosphere. The enclosure is mechanically strong enough to withstand the explosion pressure developed inside it. To prevent an explosion due to hot spot on the surface of the motor, flameproof induction motors are subjected to heat run test to determine the maximum surface temperature and temperature class with respect to the ignition temperature of the surrounding flammable gas atmosphere. This paper highlights the design features of flameproof motors and their surface temperature classification for different sizes.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Water billing management system project report.pdfKamal Acharya
Our project entitled “Water Billing Management System” aims is to generate Water bill with all the charges and penalty. Manual system that is employed is extremely laborious and quite inadequate. It only makes the process more difficult and hard.
The aim of our project is to develop a system that is meant to partially computerize the work performed in the Water Board like generating monthly Water bill, record of consuming unit of water, store record of the customer and previous unpaid record.
We used HTML/PHP as front end and MYSQL as back end for developing our project. HTML is primarily a visual design environment. We can create a android application by designing the form and that make up the user interface. Adding android application code to the form and the objects such as buttons and text boxes on them and adding any required support code in additional modular.
MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software. It is a stable ,reliable and the powerful solution with the advanced features and advantages which are as follows: Data Security.MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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Simulation and Performance of AC Drives Using SVPWM Technique
1. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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Simulation and Performance of AC Drives Using SVPWM Technique
B.Sujatha
Assistant Professor, Dept of EEE
BVRIT Hyderabad college of Engg for Women
Hyderabad, India
sujatha.b@bvrithyderabad.edu.in
K.Bhavya
Assistant Professor, Dept of EEE
BVRIT Hyderabad college of Engg for Women
Hyderabad, India
bhavya.k@bvrithyderabad.edu.in
Abstract- Drives are mainly categorized into constant-speed and variable-speed drives. AC machines have been used in constant-speed
applications, where as DC machines were preferred for variable speed drives. Due to the advancement in power semiconductor devices and
microprocessors, AC machines are widely used in variable speed drives.
This paper focuses on the simulation and performance evaluation for an ac drive system with Induction motor and PMSM Motor. The
focus was based on the simulation of the power circuits using MATLAB/SIMULINK software. The performance of inverter was studied by
SVPWM technique. Space Vector Pulse Width Modulation (SVPWM) is a digital technique, which increases the output voltage capability and
increases DC bus utilization voltage. The performance of an ac drive system was simulated and evaluated for variable speed operation from no
load to rated speed under constant torque operation. The advantages and disadvantages of Induction motor and PMSM are analyzed and
presented in this paper
Keywords- PWM, SVPWM, THD, Induction motor, PMSM.
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I. INTRODUCTION
The electrical machine that transforms electrical energy into
mechanical energy, and vice-versa, is the workhorse in a
drive system Traditionally, AC machines with a constant
frequency sinusoidal power supply have been used in
constant-speed applications, where as DC machines were
preferred for variable-speed drives. DC machine drive
converter and controls are simple and the machine torque
response is very fast. Disadvantages are higher cost, higher
rotor inertia and maintenance problems with commutator
and brushes and do not permit the machine to operate in
dirty and explosive environments. The AC motors are light
in weight, inexpensive and require less maintenance
compared with DC motors. AC motors are now employed in
variable-speed drives due to the development of
semiconductor converters employing thyristors, power
transistors, IGBTs and GTOs.
Sinusoidal PWM is most popular technique used in AC
motor control. It employs a triangular carrier wave
modulated by a sine wave and the points of intersection
determine the switching points of the power devices in the
inverter. This method has some disadvantages, such as
higher switching losses and Complexity in digital
implementation.
At present, the control strategies are
implemented in digital systems, and therefore digital
modulating techniques are also available. Space Vector
Pulse Width Modulation (SVPWM) scheme can be
implemented digitally with DSPs. Space vector modulation
increases the output voltage efficiently and generates less
THD.
II. SPACE VECTOR PULSE WIDTH MODULATION
Space Vector Modulation (SVM) was generated as a vector
approach to pulse width modulation (PWM) for three-phase
inverter. It offers extended output voltage capability of the
PWM waveforms and prevents unnecessary switching hence
less commutation losses. It is a more practiced technique for
generating sine wave that provides a higher voltage to the
motor with low THD. The main aim of any modulation
technique is to attain variable output having a maximum
fundamental component with minimum harmonics. Space
Vector PWM (SVPWM) method is an advanced PWM
method and widely used for variable speed drive
application.
III. A SPACE VECTOR PWM
The space vector modulation is a highly efficient way to
generate the six PWM signals necessary at the power stage
for two-level inverter. The circuit model of a typical three
phase voltage source PWM inverter (two-level inverter) is
shown in fig 1.
Fig 1. Three-phase Voltage source PWM Inverter
2. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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There are 6 power switches, S1 to S6 that shape the output
which are controlled by the switching variables a, a1
, b, b1
,
c, c1
. When the upper transistor is switched ON then the
switching variables a or b or c equal to 1 and the
corresponding lower transistor is switched OFF & the
switching variable equal to a1
or b1
or c1
equal to 0.
Therefore, the ON and OFF states of the upper transistor and
Vdc can be used to determinate output voltage.
The line-to-line voltage vector [Vab Vbc Vca]t
is expressed in
terms of the switching variable vector [a, b, c]t
which is
represented by equ(1) in the following:
…(I)
Also, the phase voltage vector [Va Vb Vc]t
is expressed in
terms of the switching variable vector [a, b, c]t
which is
represented by equ (2) in the following
….(2)
Fig 2. Inverter voltage vectors (V0 to V7)
In Fig 1, there are eight possible combinations of on and off
patterns for power switches. The on and off states of the
lower transistors are opposite to the upper one and so are
easily determined once the states of the upper transistors are
determined.
The eight switching states, output line to neutral voltage and
output line-to-line voltage in terms of DC-link Vdc are
formulated in table 1 by combining equations 1 and 2, and
Fig 3 shows the eight inverter voltage vectors(V0 to V7).
Table 1: Switching Vectors, phase voltages and output line
to line voltage
IV. SPACE VECTOR CONCEPT
The three phase reference phase voltages Va, Vb, and Vc
are calculated from the amplitude of reference voltage space
vector and inverter reference frequency. In order to
implement SVPWM, the reference phase voltages are
transformed to two phase stationary reference frame (α-ß).
The relative position of three phases (a, b and c) and two
phase stationary (d-q) frame which consists of the horizontal
(d) and vertical (q) axes. is shown in Fig 3.
Fig 3. The relationship of abc reference frame & stationary
dq reference frame
From this figure, the relation between these two reference
frames is below
fdqo = Ks fabc …(3).
As described in Fig. 3, this transformation is equivalent to
an orthogonal projection of [a, b, c]t
onto the two-
dimensional perpendicular to the vector [1, 1, 1]t
(the
equivalent d-q plane) in a three-dimensional coordinate
system.
3. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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Six non-zero vectors and two zero vectors are framed. Six
nonzero vectors (V1 –V6) shape the axes of a hexagonal as
depicted in Fig. 4, and feed electric power to the load.
Each section represents 60o
of the fundamental cycle. Two
zero vectors (V0 and V7) are at the origin and apply zero
voltage to the load. V0, V1, V2, V3, V4, V5, V6, and V7 are
considered as basic voltage space vectors. The resultant
voltage (Vref) is applied to calculate the angular position of
the voltage space(α). The six sectors are selected by an
angle α.
The main aim of space vector PWM technique is to
approach the reference voltage vector Vref using the eight
switching states. One simple method is to generate the
average output of the inverter in a small period, T to be the
same as that of Vref in the same period.
The modulation index depends on amplitude of the voltage
space vector V*. For constant Dc link voltage, if V*
increases modulation index also increases and vice-versa.
The time duration T1, T2 and T0 for realizing the reference
space vector are calculated. The time durations calculated
for the each sector are merged to give the final time
durations (T1, T2, and T0) of selected switching states.
Fig 4. Basic switching vectors and sectors
V. SVPWM CAN BE IMPLEMENTED BY THE FOLLOWING
STEPS:
Step 1: Determination of Vd, Vq, Vref, and angle (α)
Step 2: Determination of time duration T1, T2, T0
Step 3: Determination of the switching time of each
transistor (S1 to S6).
Step 1: Determination of Vd, Vq, Vref, and angle (α)
Vd, Vq, Vref, and angle (α) can be calculated as follows
Fig 5. Voltage Space Vector and its components in (d, q)
Step 2: Determination of time duration T1,T2,T0
The switching time duration for any sector can be computed
as follows:
4. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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Fig 6. Reference vector as a combination of adjacent
vectors at sector1
Step 3: Determination of the switching time of each IGBT
(S1 to S6)
Fig 7.Switching time of each IGBT
The ON state time for each sector is summarized in Table 2,
and it can be used to build SVPWM in
MATLAB/SIMULINK model.
Table2. Switching time calculation for each sector
Sector Upper Switches (S1, S3,
S5)
Lower Switches (S4,
S6 , S2)
1
S1 = T1+ T2 +T0/2
S3 = T2+ T0/2
S5 = T0/2
S4 = T0/2
S6 = T1 +T0/2
S2 = T1 + T2 +T0/2
2
S1 = T1+ T0/2
S3 = T1+ T2 +T0/2
S5 = T0/2
S4 = T2+ T0/2
S6 = T0/2
S2 = T1+ T2 +T0/2
3
S1 = T0/2
S3 = T1+ T2 +T0/2
S5 = T2+ T0/2
S4 = T1+ T2 +T0/2
S6 = T0/2
S2 = T1+ T0/2
4
S1 = T0/2
S3 = T1+ T0/2
S5 = T1+ T2 +T0/2
S4 = T1+ T2 +T0/2
S6 = T2+ T0/2
S2 = T0/2
5
S1 = T2+ T0/2
S3 = T0/2
S5 = T1+ T2 +T0/2
S4 = T1+ T0/2
S6 = T1+ T2 +T0/2
S2 = T0/2
6
S1 = T1+ T2 +T0/2
S3 = T0/2
S5 = T1+ T0/2
S4 = T0/2
S6 = T1+ T2 +T0/2
S2 = T2 +T0/2
5. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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VI. MATLAB/SIMULINK MODELING OF SVPWM FOR
TWO LEVEL INVERTER
Fig 8. Simulink /subsystem block diagram of SVPWM for
two level inverter
Fig 9.PWM pulses for SVPWM technique
SVPWM algorithms were developed and the conditions to
achieve these are derived in terms of inverter states.The
PWM signals for two-level inverter can be generated by
comparing equivalent DC values of time durations with the
symmetrical triangular waveform.
VII. MATLAB/SIMULINK MODEL OF SVPWM
INVERTER WITHOUT FILTER
Fig 9. Simulink block diagram of SVPWM inverter without
filter
Fig 10. Simulation Results of Output line voltages and
Line current for SVPWM inverter without filter
Fig 11. THD of Output line voltages for SVPWM
inverter without filter
VIII. CONCEPT OF FILTER
The output voltage wave forms of inverter have either the
quasi-square wave form or pulse width modulation wave
form. These voltage wave forms contain harmonics. The
voltage wave forms of a PWM inverter have a negative
impact on the performance of an induction motor in terms
of heating and torque pulsations. In order to eliminate these
voltage harmonics in wave form, it is necessary to pass them
through a suitable filter.
A wide variety of filters are available to improve the output
waveform. The main limitations of RLC and LCL filters are
they are very expensive and the use of resistance in the
filter results energy losses.
The mostly used filter topology for an AC drive system is
LC filter. The inductance offers the high impedance to
6. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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harmonic voltage. Higher the harmonic member, higher will
be the impedance and lower will be the magnitude of the
harmonic at the out put. The capacitance offers a shunt path
for the harmonic current.
IX. FILTER DESIGN
In order to be able to connect a standard industrial
motor, the motor voltage has to be almost sinusoidal. The
filter performance with respect to the motor voltage is
determined by its resonance frequency. In order to achieve
an almost sinusoidal motor voltage, the resonance frequency
should be below the lowest harmonic frequency of the
inverter and the voltage resulting with pulse width
modulation.
The values of L and C are determined using the following
formulas.
L = 3 % Vph / I fl * w
C = Q / 3 * V2
ph * w
X. MATLAB/SIMULINK MODEL OF SVPWM INVERTER
WITH FILTER
Fig 12. Simulink block diagram of SVPWM inverter with
filter
Fig 13.Simulation Results of Output line voltages and
Line current for SPWM inverter using filter
Fig 14.THD of Output line voltages for SVPWM
inverter with filter
XI. AC MACHINES FOR DRIVES
The electrical machine that converts electrical
energy into mechanical energy, and vice-versa, is the
workhorse in a drive system. Industrial drive applications
are broadly classified into constant-speed and variable-speed
drives Traditionally, AC machines with a constant
frequency sinusoidal power supply have been used in
constant-speed applications, where as DC machines were
preferred for variable-speed drives. DC machine drive
converter and controls are simple and the machine torque
response is very fast. Disadvantages are higher cost, higher
rotor inertia and maintenance problems with commutator
and brushes and do not permit the machine to operate in
dirty and explosive environments. The AC motors are light
in weight, inexpensive and require less maintenance
compared with DC motors. AC motors are now employed in
variable-speed drives due to the development of
semiconductor converters employing thyristors, power
transistors, IGBTs and GTOs.
The most widely used AC motors are Induction motors and
Synchronous motors. Switching power converters offer an
easy way to regulate both the frequency and magnitude of
the voltage and current applied to a motor. It results higher
efficiency and performance . The most common principle is
the constant V/f principle which requires that the magnitude
and frequency of the voltage applied to the stator of a motor
maintain a constant ratio. The magnitude of the magnetic
field in the stator is kept at an approximately constant level
throughout the operating range. So constant torque
producing capability is maintained. When transient response
is critical, switching power converters also allow easy
control of transient voltage and current applied to the motor
to achieve faster dynamic response. The constant V/f
principle is considered for this application.
Synchronous motor drives are close competitors to
induction motor drives in many industrial applications. They
are generally more expensive than induction motor drives,
but the advantage is that the efficiency is higher, which
tends to lower the life cycle cost.
In a permanent magnet synchronous motor, the dc
field winding of the rotor is replaced by a permanent
magnet. PMSM have a higher full load efficiency and power
factor than an induction motor. Because of low losses, it is
7. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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possible to make motors with very high power density and
torque to inertia ratios
XII. MATLAB/SIMULINK MODEL OF SVPWM
INVERTER FED AC DRIVE
Fig15. Simulink block diagram of SVPWM inverter fed AC
drive
Fig 16. Speed &Torque response under no load for IM
drive
Fig 17. Speed &Torque response under full load for IM
drive
Fig 18. Speed &Torque response under no load for PMSM
drive
Fig 19 Speed &Torque response under full load for PMSM
drive
Table 3: SVPWM inverter fed AC Drive under no load
XIII. CONCLUSION
From the simulation results it is observed that
THD of output line voltage for SVPWM technique
without filter is 30.47%.As the aim is to get low THD with
sinusoidal output voltage waveform it is proposed to use an
LC filter.
THD of output line voltage for SVPWM technique
using filter is 4.86%.It is observed that the THD of the
output voltage waveform is reduced using filers.
This sinusoidal inverter output under variable
frequency operation with V/f ratio constant was fed to an
Induction motor and a PMSM drive. It is observed that the
PMSM drive draws lesser stator current compared to its
equivalent output power rated induction motor. It is
observed from the simulation studies that the speed response
8. International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169
Volume: 5 Issue: 7 11 – 18
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in terms of steady state error and rise time of the IM and
PMSM was almost same at the same stator frequency.
Table 3: SVPWM inverter fed AC drive under No load
Table 4: SVPWM inverter fed AC drive under full load
.
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friendly Performance of the PWM Voltage Source
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[2] 2. Zhenyu yu and David Figoli, “AC Induction motor
control using constant V/Hz principle and space
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[3] 3. Keliang Zhou and Danwei Wang, “Relationship between
Space-Vector Modulation and Three-Phase Carrier-Based
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Industrial Electronics, Vol.49, No.1, Feb-2002.
[4] 4.G. Narayanan, & V.T. Ranganathan, Department of
Electrical Engg., Indian Institute of Science, Bangalore,
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[5] 5.Tariq Masood.CH, Dr. Abdel-Aty Edris, Dr. R.K
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[6] 6.Keliang Zhou and Danwei Wang, “Relationship between
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