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29,922 Article Results

Comparative Analysis of PWM Techniques for Three Level Diode Clamped Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5033
Zulkifilie Bin Ibrahim , Md. Liton Hossain , Ismadi Bin Bugis , Jurifa Mat Lazi , Nurazlin Mohd Yaakop
Multilevel inverters are increasingly being used in high-power medium voltage industrial drive applications due to their superior performance compared to conventional two-level inverters. Thre are a number of Pulse width modulation (PWM) techniques applied in recent years. The most widely applied PWM techniques are Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM).  SPWM is the most simple modulation technique that can realize easily in analog circuit.  However, it has some drawbacks such as higher total harmonic distortion (THD), lower effective DC utilization and lower switching frequency. Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. The complexity is due to the difficulty in determining the reference vector location, on times calculation, and switching states selection. This paper presents a simple SVPWM algorithm for diode clamped three level inverters based on standard two-level SVPWM which can easily determine the location of reference vector, calculate the on-times, the selection of switching states. Three level diode clamped inverter (3LDCI) using space vector modulation technique has been modeled and simulated using MATLAB/SIMULINK and Origin 6.1 with a passive R-L load that can be extended to any level. Simulation results are presented to verify the proposed SVPWM control in terms of THD. The results are compared with conventional sinusoidal pulse width modulation (SPWM) where SVPWM shows better performance than SPWM in terms of THD.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6038
Volume: 5
Issue: 1
Page: 15-23
Publish at: 2014-07-15

Design of New Single-phase Multilevel Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5036
Rasoul Shalchi Alishah , Daryoosh Nazarpour , Seyyed Hossein Hosseini , Mehran Sabahi
Multilevel inverters with more number of levels can produce high quality voltage waveforms. In this paper, a new single-phase structure for multilevel voltage source inverter is proposed which can generate a large number of levels with reduced number of IGBTs, gate driver circuits and diodes. Three algorithms for determination of dc voltage sources’ magnitudes are presented which provide odd and even levels at the output voltage waveform. A comparison is presented between proposed multilevel inverter and conventional cascade topology. The proposed topology is analyzed by the experimental and simulation results.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6218
Volume: 5
Issue: 1
Page: 45-55
Publish at: 2014-07-15

Open Loop and Closed Loop Performance of Switched Reluctance Motor with Various Converter Topologies

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5041
Malligunta Kiran Kumar , G.R.K. Murthy , S S Srinivas.Addala
Switched reluctance motor (SRM) is becoming popular because of its simple construction, robustness and low-maintenance. This motor is very useful for high speed applications because no windings are placed on rotor and can also be used for variable speed applications in industries. Converter is one of the important elements in SRM which plays a very crucial role. In this paper various converter topologies for 6/4 switched reluctance motor and Asymmetric bridge converter topology for 8/6 switched reluctance motor are discussed. Finally a closed loop for each converter topology is proposed. The converter topologies are simulated by using MATLAB/SIMULINK. Constant speed is achieved in closed loop control.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6133
Volume: 5
Issue: 1
Page: 83-92
Publish at: 2014-07-15

Modeling and Simulation of a Carrier-based PWM Voltage Source Inverter for a Nine Phase Induction Machine Drive

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5032
Omonowo David Momoh
The analysis of a carrier-based PWM two level voltage source inverter for a nine phase induction machine drive system is presented in this paper. Methods for generating zero-sequence signals during balanced and unbalanced condition are established. Simulation results for the analysis are presented. Two fault conditions involving the voltage source inverter and the nine-phase squirrel cage induction machine load are investigated. For the two fault scenarios considered, the effects on the performance characteristics of the induction machine load are highlighted. The simulation results obtained show that the two imbalance conditions considered result in substantial oscillations on the electromagnetic torque of the machine with attendant reduction in the torque rating. There is also large slip in the rotor speed.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6175
Volume: 5
Issue: 1
Page: 1-14
Publish at: 2014-07-15

Harmonic Analysis of Seven and Nine Level Cascade Multilevel Inverter using Multi-Carrier PWM Technique

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5040
Chetanya Gupta , Devbrat Kuanr , Abhishek Varshney , Tahir Khurshaid , Kapil Dev Singh
The use of multilevel inverters has become popular in recent years for high-power applications. Multilevel Inverters are power converter systems composed by an array of power semiconductor sources that when properly connected and controlled can generate a multistep voltage waveform with variable and controllable frequency, phase and amplitude. This study deals with the comparison of a 7-level inverter with a 9-level inverter system; the voltage source inverters (VSI) are modelled and simulated using MATLAB Simulink and the results are presented. The test results verify the effectiveness of the proposed strategy in terms of computational efficiency as well as the capability of the inverter to produce very low distorted voltage with low-switching losses. This research aims to extend the knowledge about the performance of different clamped multilevel inverter through harmonic analysis. Simulations results validate up to the mark performance of the mentioned topologies.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6190
Volume: 5
Issue: 1
Page: 76-82
Publish at: 2014-07-15

The Method for Measuring Loop Resistance in Gas Insulated Substation

10.11591/ijeecs.v12.i10.pp7092-7098
Li Zhou , Tiecheng Lu , Bo Zhang , Guangkai Yu , Jiawei Wan
This paper studies the method for measuring the loop resistance of GIS conductor pole basing on the super capacitor producing impulse current up to several thousand amperes. This method overcomes the limitations of conventional diagnostic method. Typical GIS conductor poles are chosen. Based on FEA and lab tests, the effect of different forms of current and contact condition, relationship between the temperature of contact and the loop resistance is researched. In full-scale testing under realistic operating conditions on the new 220 kV GIS using prototype instrumentation a very good sensitivity in an early stage was obtained.
Volume: 12
Issue: 10
Page: 7092-7098
Publish at: 2014-07-05

A Coal Mine Security Production Dispatching System with Web Configuration Technology

10.11591/ijeecs.v12.i10.pp7070-7075
Hui Liu , Qiu Junlin , Zhou Caiying , Shi Zhe
Coal mine security production dispatching system with web configuration technology is an advanced information system that integrates Internet, Database, XML and Web configuration technology. The system combines organically information of real-time data of coal mine safety monitoring and production scheduling, and digitizes it and finally discloses solution Visual Graph via ActiveX-based components of Web configuration to achieve standardization, normalization, and high efficiency of coal mine safety production scheduling. This system has been successfully utilized in coal mine for two years and achieved expected success of providing fresh, quantitative, and truthful production scheduling information for safety production scheduling and management department.
Volume: 12
Issue: 10
Page: 7070-7075
Publish at: 2014-07-05

Model Construction and Simulation of Weighted Industrial Cluster Complex Network

10.11591/ijeecs.v12.i10.pp7330-7336
Lijun Wang , Lei Wen
In this paper, we construct a weighted industrial cluster complex network model according to preferential attachment and local world mechanism, in which the logistics amount of business contact between one enterprise and others is defined as edge weight. We simulate and analyze statistic characteristics of the industrial cluster model such as degree distribution, point strength, point strength-point strength correlation, and relationship with degree and point strength. The simulation results show that the degree and point strength distribution are accord with power law distribution, the point strength-point strength correlation is negative, and the relationship with degree and point strength is strongly linear.
Volume: 12
Issue: 10
Page: 7330-7336
Publish at: 2014-07-05

Design and Simulation Low Voltage Single-Phase Transformerless Photovoltaic Inverter

10.11591/ijeecs.v12.i7.pp5163-5173
Rajendra R Aparnathi , Ved Vyas Dwivedi
The last Deckard years developing Inverter technology for renewable energy and high efficiency and more improvement solar and wind power plant. Transformer less inverter technology is best and improves efficiency, power quality and reduces switching loss. single-phase grid connected transformerless photovoltaic (PV) inverter for residential application is presented. The inverter is derived from a boost cascaded with buck converter along with a line frequency unfolding circuitIn this research paper transformer less photovoltaic (PV) inverter is going to be more adopted in order to achieve high benefit.  The selected inverters are the full-bridge inverter with bipolar modulation, full-bridge inverter with DC bypass and the Highly Efficient and Reliable Inverter Concept (HERIC). A low voltage single-phase grid-connected PV system is analyzed to verify the discussions.
Volume: 12
Issue: 7
Page: 5163-5173
Publish at: 2014-07-01

Dynamic Error Analysis of CMM Based on Variance Analysis and Improved PLSR

10.11591/ijeecs.v12.i7.pp5342-5349
Zhang Mei , Cheng Fang , Li Guihua
It is difficult to build an accurate model to predict the dynamic error of CMM by analyzing error sources. An innovative modeling method based on Variance Analysis and Improved Partial Least-square regression (IPLSR) is proposed to avoid analyzing the interaction of error sources and to overcome the multi-collinearity of Ordinary Least-square regression (OLSR). Among many impact factors the most influential parameters are selected as the independents of the model, by means of variance analysis.The proposed modeling method IPLSR can not only avoid the analysis of the error sources and the interactions, but can also solve the problem of multi-collinearity in OLSR. From experimental data the expository capability of this IPLSR model can be calculated as 85.624 percent, and the mean square error is 0.94μm. As comparison, the mean square values of conventional PLSR and OLSR are 1.04μm and 1.39μm, respectively. So IPLSR has higher predicting precision and better expository capability.
Volume: 12
Issue: 7
Page: 5342-5349
Publish at: 2014-07-01

Variable Step Size Blind Equalization based on Sign Gradient Algorithm

10.11591/ijeecs.v12.i7.pp5491-5498
Ying Xiao , Fuliang Yin
This work proposes a variable step size sign gradient algorithm to solve the problem of blind equalization under impulse noise environment. This algorithm suppresses the impulse noise interference effectively because of the sign operation on the instantaneous gradient based on constant modulus algorithm (CMA) cost function. Meanwhile, the excess mean square error can be further reduced by use of a variable step size algorithm based on the iterative times and the reliability of the output signal. Simulation results show that, the variable step size blind equalization based on sign gradient algorithm has the fastest convergence rate and the lowest steady state residue error compared with the fractional low order CMA, the nonlinear transform CMA and stop-and-go CMA.
Volume: 12
Issue: 7
Page: 5491-5498
Publish at: 2014-07-01

Characteristics Analysis and Detection Algorithm of Mosquitoes

10.11591/ijeecs.v12.i7.pp5368-5378
Jahangir Alam S.M. , Hu Guoqing , Cheng Chen
The systematic detection and elimination of mosquitoes is a valuable process, the results of which could be important in the fight against Malaria. In this study, image processing is used, allowing the researchers to detect the mosquitoes and their locations. Mosquitoes' physical characteristics, territorial and behavioral patterns were also analyzed through recognition technology. It is found that mosquitoes can be detected and differentiated by their physical, territorial and behavioral patterns through these methodologies. In addition to mosquitoes, flies and bees are also included in this study and were analyzed for their patterns, as well as their distinguishing features. Size, number of objects, proboscis, body shape, color, antennae, hind legs, and shape parameters were all factors considered for mosquito detection with image processing. All these informations were used in the Mosquito Detection Algorithm. This study provides characteristic descriptions of all three insects and statistical analysis of the data found.
Volume: 12
Issue: 7
Page: 5368-5378
Publish at: 2014-07-01

Measurement Method of the Grain Quantity Based on The Ground Pressure

10.11591/ijeecs.v12.i7.pp5552-5558
Fan Chao , Zhang Dexian , Yang Tiejun , Fu Hongliang
To measure the stored grain quantity accurately and reliably, the measurement method based on the ground pressure is put forward. According to the randomness of the granary pressure distribution caused by the limited fluidity of the grain, the layout of the pressure on the ground is set up, and the mean pressure on the ground is used to represent the whole ground pressure. At the same time, the pressure distribution on the wall is analyzed and the compensation method is given, which can reduce the sensors used in this method and the cost is low. Lastly, the estimation model of the stored grain quantity based on the ground pressure is put forward, to improve the prediction accuracy of the grain weight, the parameters are estimated based on the ratio of the error. The experiment results shown that, the measurement error is less than 3% by using this method, which can meet the actual need of real-time online monitoring the national grain storage quantity and distribution effectively.
Volume: 12
Issue: 7
Page: 5552-5558
Publish at: 2014-07-01

Implementation of Input-Process-Output Model for Measuring Information System Project Success

10.11591/ijeecs.v12.i7.pp5603-5612
A'ang Subiyakto , Abd. Rahman Ahlan
Measurement of the information system (IS) project success has become the interesting topic for researchers and practitioners since the Standish Group published their findings in 1994.  Project success theory is the main concept in this topic, but this theory is still an ambiguous concept and lack in agreement among researchers and practitioners. They are also still tend to focus on single or partial dimension. Therefore, they did not get a clear picture of the system measurements. This study developed an alternative model of the project success measurement based on input-process-output (IPO) model. The development was conducted using comparison, adoption, adaptation, and combination the previous theories and models: Davis's IPO model, the project success theories, Delone and McLean' model, and the project classificatory framework. As indicated in most studies that most of models are developed using the previous theories and models rather than on empirical proofs. The result is a IS project success model consisting of 9 variables and 36 relationships among the variables. Although, the model is only a conceptual model, but it was developed completely and coherently considering three main aspects of project success measurement, namely: processional and causal models, project success theories, and the influence concept of project environment.
Volume: 12
Issue: 7
Page: 5603-5612
Publish at: 2014-07-01

Improvement of Power Quality using Fuzzy Logic Controller In Grid Connected Photovoltaic Cell Using UPQC

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5043
K.Ramalingeswara Rao , K.S. Srikanth
In this paper, the design of combined operation of UPQC and PV-ARRAY is designed. The proposed system is composed of series and shunt inverters connected back to back by a dc-link to which pv-array is connected. This system is able to compensate voltage and current related problems both in inter-connected mode and islanding mode by injecting active power to grid. The fundamental aspect is that the power electronic devices (PE) and sensitive equipments (SE) are normally designed to work in non-polluted power system, so they would suffer from malfunctions when supply voltage is not pure sinusoidal. Thus this proposed operating strategy with flexible operation mode improves the power quality of the grid system combining photovoltaic array with a control of unified power quality conditioner. Pulse Width Modulation (PWM) is used in both three phase four leg inverters. A Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality improvement by reducing the distortions in the output power. The simulated results were compared among the two controller’s strategies With pi controller and fuzzy logic controller.DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6184
Volume: 5
Issue: 1
Page: 101-111
Publish at: 2014-07-01
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