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.
Design Of Hybrid Series Active Filters for Harmonic Reduction in Single Phase...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Comparison of Control Strategies of DSTATACOM for Non-linear Load Compensationidescitation
For load compensation a number of control strategies have been developed by
researchers but choice of control strategy is important to cope with the operating condition
of system. In this paper five control strategies viz. instantaneous p-q theory, synchronous
reference frame Method(SRF), Modified SRF Method(MSRF), instantaneous symmetrical
component theory(ISCT) and Average unit power factor theory(AUPFT) are compared for
different two conditions. The performance of the system simulated in Matlab Platform and
evaluated considering the source current total harmonic distortion. The result shows
Modified SRF(id-iq) Method has improved system performance as compared to others.
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.
Design Of Hybrid Series Active Filters for Harmonic Reduction in Single Phase...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
Comparison of Control Strategies of DSTATACOM for Non-linear Load Compensationidescitation
For load compensation a number of control strategies have been developed by
researchers but choice of control strategy is important to cope with the operating condition
of system. In this paper five control strategies viz. instantaneous p-q theory, synchronous
reference frame Method(SRF), Modified SRF Method(MSRF), instantaneous symmetrical
component theory(ISCT) and Average unit power factor theory(AUPFT) are compared for
different two conditions. The performance of the system simulated in Matlab Platform and
evaluated considering the source current total harmonic distortion. The result shows
Modified SRF(id-iq) Method has improved system performance as compared to others.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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.
Brushless DC (BLDC) motors are becoming an increasingly popular motor of choice for its unique characteristics. The BLDC motor drive is assumed to have trapezoidal back-electromotive force (EMF), rectangular phase currents and together produces the desired torque. However, practical back-EMF waveform might not be exactly trapezoidal because of current ripple, design considerations and manufacturing limitations. The adverse effect is the torque ripple generated due to the current ripple that causes mechanical vibration, acoustic noise and affects the accuracy of speed and position control which is not desirable in motor operation. In this paper an algorithm is developed to control and minimize the generated torque ripple using Space Vector Pulse Width Modulation (SVPWM) scheme. The efficiency improvement of slim type BLDC motor is confirmed using MATLAB environment and low cost TI Piccolo F28035 microcontroller (MC).
International Journal of Engineering and Science Invention (IJESI)inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
A NEW APPROACH TO DTC METHOD FOR BLDC MOTOR ADJUSTABLE SPEED DRIVEScscpconf
This paper proposes a new approach to direct torque control (DTC) method for brushless direct current (BLDC) motor drives. In conventional DTC method, two main reference parameters are used as: flux and torque. In this paper, the new approach has been proposed to improve the BLDC motor dynamic performance. A main difference from the conventional method of it was that only one reference parameter (speed) was used to control the BLDC motor and the second control parameter (flux) was obtained from speed error through the proposed control algorithm. Thus, the DTC performance has been especially improved on systems which need variable speed and torque during operation, like electric vehicles. The dynamic models of the BLDC and the DTC method have been created on Matlab/Simulink. The proposed method has been confirmed and verified by the dynamic simulations on different working conditions.
Comparison between an Interleaved Boost Converter and CUK Converter Fed BLDC ...IJPEDS-IAES
There is a great concern of torque ripple and power quality of three phase
voltage source converter fed Permanent Magnet Brushless DC Motor
(PMBLDCM). In this paper, two control strategies for BLDC motor drive
has been investigated. One of the control strategies is based on PFC - CUK
converter fed PMBLDCM drive and another one is PFC- interleaved boost
converter fed BLDC motor drive. Comparison has been made between the
two control stragies in terms of Torque ripple, Total harmonic distortion
(THD) and power factor for different operating speeds. The proposed work
as been implemented under MATLAB/simulink environment. Simulation
results are presented to validate proposed work. From the results, it is
observed that PFC interleaved Boost converter fed BLDC motor drive is
more effective compared to CUK converter fed BLDC motor drive.
Analysis of Variable MLI Based BLDC Motor Drive with PFC for Reduced Torque R...IJERA Editor
This paper presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed brushless direct
current (BLDC) motor drive as a cost-effective solution for low-power applications. An approach of speed
control of the BLDC motor by controlling the dc link voltage of the voltage source inverter (VSI) is used with a
single voltage sensor. This facilitates the operation of VSI at fundamental frequency switching by using the
electronic commutation of the BLDC motor which offers reduced switching losses. A BL configuration of the
buck–boost converter is proposed which offers the elimination of the diode bridge rectifier, thus reducing the
conduction losses associated with it. A PFC BL buck–boost converter is designed to operate in discontinuous
inductor current mode (DICM) to provide an inherent PFC at ac mains. The performance of the proposed drive
is evaluated over a wide range of speed control and varying supply voltages (universal ac mains at 90–265 V)
with improved power quality at ac mains. The obtained power quality indices are within the acceptable limits of
international power quality standards such as the IEC 61000-3-2. The performance of the proposed drive is
simulated in MATLAB/Simulink environment, and the obtained results are validated experimentally on a
developed prototype of the drive.
Using HBCC System Power Factor Correction of Three Phase PWM AC Chopper Fed I...Chaitra Panat
In this presentation, Power Factor is corrected using a special technique which is nothing but a Hysteresis Band Current Control method. Smooth starting as well as speed control of induction motor drive system is also possible.
Hardware-in-the-loop setup for enhanced modular multi-level converter with re...IJECEIAES
Owing to its essential features, such as modularity and exceptional power quality, the modular multilevel converter (MMC) emerges as the optimal converter topology for high-voltage direct current (HVDC) applications. Traditionally, MMCs are controlled through a method called nearest level modulation (NLM), which generates N+1 AC output voltages, where N represents the number of sub modules (SMs) per arm. In this paper, we introduce a modified NLM technique designed to yield 2N+1 and 4N+1 levels, with a focus on efficiently controlling internal dynamics. The proposed MMC is evaluated using a hardware-in-the-loop (HIL) environment to obtain real-time simulation outcomes. This MMC topology demonstrates a reduction in circulating currents and capacitor voltage ripple.
In the proposed approach,instead of a conventional 3- Phase inverter a component minimized single pha se inverter is utilized which reduces the cost of the inverter,th e switching losses,and the complexity of interface circuits to generate logic signals. A performance comparison of the prop osed inverter fed drive with a conventional 3Phase inverter fed drive is also mode in terms of speed response and t otal harmonic distortion (THD) of the stator curren t. The proposed inverter fed IM drive is found acceptable consideri ng its cost reduction and other advantageous featur es. A general pulse width modulation (PWM) method for c ontrol of 1-phase inverters is presented. The vecto r PWM offers a simple method to select three or four vectors tha t effectively synthesize the desired output voltage,even in presence of voltage oscillations across the two dc-link capacit ors. The influence of different switching patterns on output voltage symmetry,current waveform,switching frequency and common mode voltage can be examined. The paper als o discusses how the use of the wye and delta connecti ons of the motor windings affects the implementatio n of the pulse width modulator.
Compensator Based Performance Enhancement Strategy for a SIQO Buck ConverterIAES-IJPEDS
This paper attempts to design lag and lag-lead compensators for improving the performance of a Single Inductor Quad Output (SIQO) dc-dc buck converter in terms of time domain and frequency domain specifications. It develops the state space averaged model to find the duty ratio of the desired output voltages at steady state. The exercise arrives at the transfer function model from the state space averaged model through the use of its lumped small signal equivalent circuit which allows analyzing the performance of the system in frequency and time domains.The responses are derived in the MATLAB/Simulink® using discrete components incorporating compensators of the converter. The hardware results obtained using Data Acquisition Module DT9834® interfaced to MATLAB/Simulink® and prototype model establish the performance of the compensator based converter and further emphasize its ability to minimize the ripples over a range of operating loads.
Similar to Dcm analysis and inductance design method of interleaved boost converters (20)
Compensator Based Performance Enhancement Strategy for a SIQO Buck Converter
Dcm analysis and inductance design method of interleaved boost converters
1. DCM ANALYSIS AND INDUCTANCE DESIGN METHOD OF
INTERLEAVED BOOST CONVERTERS
ABSTRACT:
In order to use interleaved boost converters in the discontinuous conduction mode (DCM), the variation
in the phase current and the input current ripple is analyzed theoretically. Based on the detailed analysis, a
numerical formula for the input current ripple is deduced by including three criteria. Using the numerical
formula, the optimized inductance that reduces the input current ripple and losses is deduced. The boundary
conduction mode (BCM) is also compared with the discontinuous conduction mode to verify their strong points.
In order to verify the analysis, simulation and experimental results are compared with theoretical data. The
consideration of the BCM is also progressed by comparing with the DCM, and the results were different in
terms of the efficiency and the input current ripple.
