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25,002 Article Results

Inter-Harmonics in Voltage-Sourced Converters based High Voltage Direct Current Systems

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4171
Phuc Huy Nguyen
Voltage-Sourced Converter (VSC) is the main component in a VSC-based High Voltage Direct Current (HVDC) system. In addition to the characteristic harmonics, the inter-harmonics could be originated from the characteristic of each converter working at different modulation frequencies, or from a distorting frequency on one or both ac (or dc) systems. The space vector representation of VSC’s switching functions is used as a tool for analyzing and giving the understanding how the inter-harmonics appear. Based on the methodological analysis, simulation models were built and implemented using SimPowerSystems in MATLAB for cases. The simulation results show that, a series of inter-harmonics is produced tend to be dominant in low-frequency range, especially the negative-sequence inter-harmonics which have lower frequencies than the fundamental. This elaborate understanding of VSC-based HVDC system’s inter-harmonic characteristic could be beneficial to harmonic measurement and mitigation control. DOI: http://dx.doi.org/10.11591/telkomnika.v13i1.6809 
Volume: 13
Issue: 1
Page: 10-19
Publish at: 2015-01-01

Yoruba Language and Numerals’ Offline Interpreter Using Morphological and Template Matching

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4189
Olakanmi O.Oladayo
Yoruba as a language has passed through generation reformations making some of the old documents in the archive to be unreadable by the present readers. Apart from this, some Yoruba writers usually mixed English numerals while writing due to brevity and conciseness of English numerals compare to Yoruba numerals which are combination of several characters. Re-typing such historical documents may be time consuming, therefore a need for an efficient Optical Character Reader (OCR) which will not only  effectively recognize Yoruba texts but also converts all the English numerals in the document to Yoruba numerals.Several Optical Character Reader (OCR) systems had been developed to recognize characters or texts of some languages such as English, Arabic, Japanese, Chinese, and Korean, however, despite the significant contribution of Yoruba language to historical documentation and communication, it was observed that there is no particular OCR system for the language. In this paper correlation and template matching techniques were used to develop an OCR for the recognition of Yoruba based texts and convert English numerals in the document to Yoruba numerals. Experimental results show the relatively high accuracy of the developed OCR when it was tested on all size Yoruba alphabets and numerals. DOI: http://dx.doi.org/10.11591/telkomnika.v13i1.6782 
Volume: 13
Issue: 1
Page: 166-173
Publish at: 2015-01-01

Effect of Parasitic Elements on the Performance of Buck-Boost Converter for PV Systems

https://ijece.iaescore.com/index.php/IJECE/article/view/5537
Subramanya x Bhat , Nagaraja H N
In the proposed study, MOSFET device used in buck-boost converter for PV systems is studied. The parameter of MOSFET Rds(on) is varied and its effect on output voltage is studied. The parasitic elements in inductor and capacitor such as resistance on buck-boost converter performance are studied.  From the proposed study it has been found that the effect of parasitic resistance in capacitor is less as compared to parasitic resistance effect of inductor. Also the proposed study gives better insight into parasitic effect of Printed Circuit Board and losses incurred due to the same. In PV systems buck-boost converter is used to convert solar energy to electrical energy which is then stored in battery to drive the loads. These parasitic elements will have considerable effect on the performance of buck-boost converter such as efficiency and output voltage as validated by experimental results.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6855
Volume: 4
Issue: 6
Page: 831-836
Publish at: 2014-12-01

Speech Enhancement Research based on Fractional Fourier transform

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3941
Jingfang Wang
As many traditional de-noising methods fail in the intensive noises environment and are unadaptable in various noisy environments, a method of speech enhancement has been advanced based on dynamic Fractional Fourier Transform （FRFT）filtering. The acoustic signals are framed. The renewing methods are put in FRFT optimal disperse degree of noising speech and this method is implemented in detail. By TIMIT criterion voice and Noisex-92, the experimental results show that this algorithm can filter noise from voice availably and improve the performance of automatic speech recognition system significantly. It is proved to be robust under various noisy environments and Signal-to-Noise Ratio (SNR) conditions. This algorithm is of low computational complexity and briefness in realization. http://dx.doi.org/10.11591/telkomnika.v12i12.6694 
Volume: 12
Issue: 12
Page: 8238-8245
Publish at: 2014-12-01

A Secure-Coordinated Expansion Planning of Generation and Transmission Using Game Theory and Minimum Singular Value

https://ijece.iaescore.com/index.php/IJECE/article/view/5503
Mehdi Zareian Jahromi , Mohsen Tajdinian , Mojtaba Jalalpour
In this paper a novel method have been proposed for expansion planning of generation and transmission that considered static security of the system such as voltage security margin And loadability limit. In the same study of expansion planning Security constraints of the system are neglected. In this study at the first step minimum singular value technique is used to evaluate voltage security margin and loadabolity limit, in order to select best bus for load incrimination. After it, in order to Supply the load, coordinated expansion planning of generation and transmission is needed, therefor the strategic interaction between transmission company (TransCo) and generation company (GenCo) for Transmission expansion planning (TEP) and generation expansion planning (GEP) in a competitive electricity market is proposed using Game Theory (GT).DOI:http://dx.doi.org/10.11591/ijece.v4i6.6682
Volume: 4
Issue: 6
Page: 868-881
Publish at: 2014-12-01

FPGA-Based Implementation Nonlinear Backstepping Control of a PMSM Drive

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4975
Badre Bossoufi , Mohammed Karim , Ahmed Lagrioui , Mohammed Taoussi
In this paper, we present a new contribution of FPGAs (Field-Programmable Gate Array) for control of electrical machines. The adaptative Backstepping control approach for a permanent magnet synchronous motor drive is discussed and analyzed. We present a Matlab&Simulink simulation and experimental results from a benchmark based on FPGA.  The Backstepping technique provides a systematic method to address this type of problem. It combines the notion of Lyapunov function and a controller procedure recursively. First, the adaptative and no adaptative Backstepping control approach is utilized to obtain the robustness for mismatched parameter uncertainties. The overall stability of the system is shown using Lyapunov technique. The simulation results clearly show that the proposed scheme can track the speed reference. Secondly, some experimental results are demonstrated to validate the proposed controllers. The experimental results carried from a prototyping platform are given to illustrate the efficiency and the benefits of the proposed approach and the various stages of implementation of this structure in FPGA.DOI: http://dx.doi.org/10.11591/ijpeds.v4i1.4645
Volume: 4
Issue: 1
Page: 12-23
Publish at: 2014-12-01

Advanced Control of Wind Electric Pumping System for Isolated Areas Application

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5030
Mohamed Barara , Abderrahim Bennassar , Ahmed Abbou , Mohammed Akherraz , Badre Bossoufi
The supply water in remote areas of windy region is one of most attractive application of wind energy conversion .This paper proposes an advanced controller suitable for wind-electric pump in isolated applications in order to have a desired debit from variation of reference speed of the pump also the control scheme of DC voltage of SIEG for feed the pump are presented under step change in wind speed. The simulation results showed a good performance of the global proposed control system.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6527
Volume: 4
Issue: 4
Page: 567-577
Publish at: 2014-12-01

Dynamic Power Quality Compensator with an Adaptive Shunt Hybrid Filter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5024
Sindhu M R , Aneesh P , Manjula G Nair , T N P Nambiar
Major portion of nonlinear loads in industries are contributed by variable speed drives because of their desirable features such as energy saving, smooth control, flexible operation and fast response. These electric drives introduce large amount of current and voltage harmonic distortions at the point of common coupling. These distortions are propagated throughout the system and affect all other loads connected in the system. Hence these distortions are to be mitigated with suitable harmonic filters installed near to the respective load terminals. This paper presents an effective ANN based digital controller for shunt hybrid harmonic filter to provide instantaneous harmonic and reactive compensation. The performance of the adaptive shunt hybrid filter is verified by simulation and experimental studies under steady state and dynamic conditions. The results show that it is an effective, flexible and low rated hybrid filter configuration.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6319
Volume: 4
Issue: 4
Page: 508-516
Publish at: 2014-12-01

A Fuzzy Logic Control Strategy for Doubly Fed Induction Generator for Improved Performance under Faulty Operating Conditions

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5015
G. Venu Madhav , Y. P. Obulesu
In this paper, decouple PI control for output active and reactive powers which is the common control technique for power converter of Doubly Fed Induction Generator (DFIG) is presented. But there are some disadvantages with this control method like uncertainty about the exact model, behavior of some parameters or unpredictable wind speed and tuning of PI parameters. To overcome the mentioned disadvantages a fuzzy logic control of DFIG wind turbine is presented and is compared with PI controller. To validate the proposed scheme, simulation results are presented, these results showed that the performance of fuzzy control of DFIG is excellent and it improves power quality and stability of wind turbine compared to PI controller. The Fuzzy logic controller is applied to rotor side converter for active power control and voltage regulation of wind turbine. The entire work is carried out in MATLab/Simulink. Different faulty operating conditions are considered to prove the effective implementation of the proposed control scheme.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.5966
Volume: 4
Issue: 4
Page: 419-429
Publish at: 2014-12-01

Analysis of Security Mechanisms in Nigeria E-Banking Platform

https://ijece.iaescore.com/index.php/IJECE/article/view/5540
Ayangbekun Oluwafemi J. , Bankole O. Felix , Saka Badirat A.
Electronic banking system has become an important practice among all banks in Nigeria. The introduction of this electronic banking has improved banking efficiency in rendering sales and services to customer, which is the 24-hour access to cash and retrieval of banking data i.e. statements, transaction details etc. It was in line with this that the studies aim at the Security Mechanisms of E-banking System. Through the cluster sampling technique, data was collected by means of questionnaires from 25 Banks officers and the result shows Electronic Banking is barely secure for the financial institutions. And through the hypothesis carried out in this research, it shows us that all banking transaction can be done anywhere is the world as long as your access device is connected to the internet service through any service provider. This Mechanism was initialized and found to be very effective for securing the banking transactions. It’s being recommended for banks and other financial institutions for maximum security.  With all these in the banking Industry, the bank has an effective electronic banking system which has improve its customer’s relationship and satisfaction. To this end, it is recommended that the bank information and Communication technology training programme should be encourage among all the banks staff, necessary legal codes banking should be established in order to enhance growth of the industry.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6857
Volume: 4
Issue: 6
Page: 837-847
Publish at: 2014-12-01

Identifying Appliances using NIALM with Minimum Features

https://ijece.iaescore.com/index.php/IJECE/article/view/5508
Sunil Semwal , R S Prasad , Pradeep Juneja
Government of India has decided to install smart meters in fourteen states. Smart meters are required to identify home appliances to fulfill various tasks in the smart grid environment. Both intrusive and non-intrusive methods have been suggested for identification. However, intrusive method is not suitable for cost and privacy reasons. On the other hand, techniques using non-intrusive appliance load monitoring (NIALM) are yet to result in meaningful practical implementation. Two major challenges in NIALM research are the choice of features (load signatures of appliances), and the appropriate algorithm. Both have a direct impact on the cost of the smart meter. In this paper, we address the two issues and propose a procedure with only four features and a simple algorithm to identify appliances. Our experimental setup, on the recommended specifications of the internal electrical wiring in Indian residences, used common household appliances’ load signatures of active and reactive powers, harmonic components and their magnitudes. We show that these four features are essential and sufficient for implementation of NIALM with a simple algorithm. We have introduced a new approach of ‘multi point sensing’ and ‘group control’ rather than the ‘single point sensing’ and ‘individual control’, used so far in NIALM techniques.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6715
Volume: 4
Issue: 6
Page: 909-922
Publish at: 2014-12-01

Fuzzy Adaptive Control for Direct Torque in Electric Vehicle

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5029
Medjdoub khessam , Abdeldejbar Hazzab , Bouchiba Bousmaha , M Bendjima
This paper presents a technique to control the electric vehicle (EV) speed and torque at any curve. Our propulsion model consist of two permanent magnet synchronous (PMSM) motors. The fuzzy adaptive PI controller is used to adjust the different static error constants, as per the speed error. The suggested based on the direct torque fuzzy control (DTFC). A Mamdani type fuzzy direct torque controller is first developed and then rules are modified using stator current membership functions. The computations are ensured by the electronic differential, this driving process permit to steer each driving wheels at any curve separately.Modeling and simulation are carried out using the Matlab/Simulink tool to investigate the performance of the proposed system.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6372
Volume: 4
Issue: 4
Page: 557-566
Publish at: 2014-12-01

A Neural Network Based Speed Control of a Dual Star Induction Motor

https://ijece.iaescore.com/index.php/IJECE/article/view/5524
Meliani Bouziane , Meroufel Abdelkader
This paper propose the use of artificial neural networks to control the speed of a Double Star Induction Motor drives fed by a two matrix converter using Venturini modulation algorithm, The advent of the field oriented with modern speed control technique has partially solved DSIM control problems because it is sensitive to drive parameter variations and performance may deteriorate if conventional controllers are used. Neural network based controller is considered as potential candidates for such an application. In this work the simulations results are provided to evaluate performance of the proposed control strategy.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6343
Volume: 4
Issue: 6
Page: 952-961
Publish at: 2014-12-01

A Battery-less Grid Connected Photovoltaic Power generation using Five-Level Common-Emitter Current-Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5020
Suroso Suroso , Winasis Winasis , Toshihiko Noguchi
Renewable power generation using photovoltaic is very interesting to be developed to deal with the problems of conventional energy sources and environmental issues. The photovoltaic power generation can operate both in stand-alone and grid-connected operations. This paper presents an application of the five-level common-emitter current-source inverter (CE-CSI) for grid connected photovoltaic system without batteries as energy storage system. In the proposed system, the five-level CE-CSI works generating a sinusoidal output current from photovoltaic system to be injected into the power grid. The transformer is used in the system to step-down the grid voltage to meet the voltage level of the photovoltaic system, and also works as a galvanic insulation between the power grid and the inverter system. Two conditions of the power grid voltage, i.e. a pure sinusoidal and a distorted power grid, are tested through computer simulation using PSIM software. Furthermore, experimental test result of the five-level inverter is also presented. The test results show that the five-level CE-CSI works well injecting a sinusoidal current into the power grid with low harmonic contents, and with unity power factor operation. The results also show that the distorted grid voltage affects the harmonic contents of the current injected by the inverter.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6464
Volume: 4
Issue: 4
Page: 474-480
Publish at: 2014-12-01

Applications of Particle Swarm Optimization Algorithm to Solving the Economic Load Dispatch of Units in Power Systems with Valve-Point Effects

https://ijece.iaescore.com/index.php/IJECE/article/view/5502
Hossein Shahinzadeh , Sayed Mohsen Nasr-Azadani , Nazereh Jannesari
Reduction of operating costs in power system in order to return the investment costs and more profitability has vital importance in power industry. Economic Load Dispatch (ELD) is one of the most important issues in reducing operating costs. ELD is formulated as a nonlinear optimization problem with continuous variables within the power plants. The main purpose of this problem is optimal planning of power generation in power plants with minimum cost by total units, regarded to equality and inequality constraints including load demand and the range of units' power productivity. In this article, Economic Load Dispatch problem has been modeled by considering the valve-point loading effects with power plants' constraints such as: the balance of production and consumption in system, the forbidden zones, range of production, increasing and decreasing rates, reliability constraints and network security. To solve the problem, Particle Swarm Optimization (PSO) Algorithms has been employed. To evaluate the effectiveness of the proposed method, the problem has been implemented on a power system with 15 generating units and the results have been evaluated.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6720
Volume: 4
Issue: 6
Page: 858-867
Publish at: 2014-12-01
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