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28,188 Article Results

Proposed PV Transformer-Less Inverter Topology Technique for Leakage Current Reduction

10.11591/ijpeds.v7.i3.pp936-945
M. N. H. khan , M.H. Delwar , Md. A. Kabir , M.S. Zahan , K. J. Ahmad , M. M. Alam , M. T. Anower
Importance and demand of using renewable energy is dramatically escalated globally. Hence, the use of renewable energy is going to touch in peak. This demand is varying according to the site choosing. For instance, Wind is preferable where air is following highly as well as solar recommended place is high sun ray reducing places. Especially, the renewable system is highly recommended for electrification issues where it’s possible to produce the electricity for fulfilling rural and remote areas electricity problem.  The photovoltaic (PV) panel of connecting with transformer based system is popular where some limitations are occurred especially cost and weight. In contrast, in this paper is focusing these issues where the transformer-less inverter system is used. Here will discuss some transformer-based and transformer-less inverter topologies and the leakage current issue which is occurred when transformer-less inverter system is used. Moreover, here is proposed a topology for reducing the leakage current after doing switching technique in both 50% and 75% duty cycle where output voltage remains quite same.
Volume: 7
Issue: 3
Page: 936-945
Publish at: 2016-09-01

Space Vector and Sinusoidal Pulse Width Modulation of Quasi Z-Source Inverter for Photovoltaic System

10.11591/ijpeds.v7.i3.pp601-609
G. Prakash , C. Subramani
This paper compares the execution of Sinusoidal Pulse width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVM) methods for a Quasi Z-source inverter (QZSI) is an another topology got from the standard Z-source inverter (ZSI).The QZSI gets each one of the upsides of the ZSI, which can comprehend buck/boost, inversion and power forming in a singular stage with upgraded trustworthiness. In like manner, the proposed QZSI has the novel purposes of enthusiasm of lower part evaluations and unfaltering dc current from the source. The QZSI highlights a broad assortment of voltage expansion which is reasonable for applications in photovoltaic (PV), as a result of the way that the PV cells yield contrasts comprehensively with temperature and daylight based enlightenment. The working qualities of the proposed course of action is analyzed in inconspicuous component and appeared differently in relation to that of the SPWM and SVM. Speculative examination of voltage help and direction methods for the QZSI in PV is explored in this paper. Amusement of the circuit setup for the previously stated equalization procedures have been taken a gander at in MATLAB/Simulation. Besides, the THD examination of both SPVM and SVM is compared.
Volume: 7
Issue: 3
Page: 601-609
Publish at: 2016-09-01

Asymmetrical Cascaded Multi Level Inverter Using Control Freedom Pulse Width Modulation Techniques

10.11591/ijpeds.v7.i3.pp854-862
Periyaazhagar D , Irusapparajan G
In this paer, the suggested topologies are gained by cascading a full bridge inverter with dissimilar DC sources. This topology has a several new patterns adopting the fixed switching frequency, multicarrier control freedom degree with mixture conceptions are established and simulated for the preferred three-phase cascaded multilevel inverter. In outstanding switching arrangement terminations, there are convinced degrees of freedom to produce the nine level AC output voltages with terminated switching positions for producing altered output voltages. These investigations focus on asymmetrical cascaded multilevel inverter engaging with carrier overlapping pulse width modulation (PWM) topologies. These topologies offer less amount of harmonics present in the output voltage and superior root mean square (RMS) values of the output voltages associated with the traditional sinusoidal pulse width modulation. This research studies carries with it MATLAB/SIMULINK based simulation and experimental results obtained using appropriated prototype to prove the validity of the proposed concept.
Volume: 7
Issue: 3
Page: 854-862
Publish at: 2016-09-01

Fission Transmission Linear-to-Circular Polarization Conversion Based on Compact Bi-Layer structure

10.11591/ijeecs.v3.i3.pp519-526
Farman Ali Mangi , Shaoqiu Xiao , Ghulam Ali Mallah , Ghulam Fatima Kakepoto , Imran Memon
A fission transmission linear-to-circular polarization conversion based on bi-layer structure is proposed which is composed of 3 × 3 array to convert linear-to-circular polarized wave. The structure is constructed by half square with “H” shape printed on both sides of the dielectric substrate that are subjected to obtain multi-band at resonance frequencies. The proposed structure realizes the giant circular polarization under the normal incidence for right and left circular polarized waves. After transmission, the incident wave decomposed into two orthogonal linear components have equal magnitudes and 90o phase difference between them. The novel approach of “fission transmission of electromagnetic waves” is firstly introduced to understand the physics of giant circular polarization conversion which is based on the sequence of incident and transmitted waves to generate strong circular dichroism.
Volume: 3
Issue: 3
Page: 519-526
Publish at: 2016-09-01

The Combined Reproducing Kernel Method and Taylor Series for Solving Weakly Singular Fredholm Integral Equations

10.11591/ijaas.v5.i3.pp109-117
Azizallah Alvandi , Mahmoud Paripour
In this paper, a numerical method is proposed for solving weakly singular Fredholm integral equations in Hilbert reproducing kernel space (RKHS). The Taylor series is used to remove singularity and reproducing kernel function are used as a basis. The effectiveness and stability of the numerical scheme is illustrated through two numerical examples.
Volume: 5
Issue: 3
Page: 109-117
Publish at: 2016-09-01

Opinion Sentiment Analysis

10.11591/ijaas.v5.i3.pp128-136
Alok Kumar , Renu Jain
An automatic system to analyze the opinions/feedbacks of the people working in any organization is proposed. The proposed system does two major jobs: the first part extracts the most relevant/important aspects from the textual feedbacks provided by clients/managers/co-workers for all the employees having similar job profile and the second part measures the degree of positivity or negativity for all the extracted aspects for every employee and then an overall performance of everyone is evaluated. We have implemented the system to study the feedback of teachers. The proposed system is flexible and versatile than the existing feedback evaluation system of teachers where students evaluate the teachers on the predefined aspects decided by experienced and senior teachers. Our system, Faculty Evaluation System (FES) identifies strengths and weaknesses of teachers on all aspects which are important to students. This information may be used by higher authorities of the institute in identifying suitable faculty members for different academic and administrative activities of the institute in addition to the teaching responsibility.
Volume: 5
Issue: 3
Page: 128-136
Publish at: 2016-09-01

Unified Power Quality Conditioner Model Based with Series and Shunt Filters

10.11591/ijpeds.v7.i3.pp743-758
khalaf Gaeid , Mounir T. Hamood
With the increase of the complexion in the power distribution system, it is very possible that several kinds of power quality disturbances are happened in a power distribution system simultaneously.This paper proposes a unified power quality conditioner (UPQC) including a series and a shunt active power filter (APF) to compensate harmonics in both the distorted supply voltage and nonlinear load current. In the series APF control scheme, a proportional-integral (PI) controller , meanwhile a PI controller and are designed in the shunt APF control scheme to relieve harmonic currents produced by nonlinear loads. The DC voltage is maintained constant using Two degree of freedom proportional integral voltage controller(2DoFPI). The performance of the proposed UPQC is significantly improved compared to the conventional control strategy. The feasibility of the proposed UPQC control scheme is validated through the simulations.
Volume: 7
Issue: 3
Page: 743-758
Publish at: 2016-09-01

Fuzzy Sliding Mode Control for Photovoltaic System

10.11591/ijpeds.v7.i3.pp964-973
Mounir Derri , Mostafa Bouzi , Ismail Lagrat , Youssef Baba
In this study, a fuzzy sliding mode control (FSMC) based maximum power point tracking strategy has been applied for photovoltaic (PV) system. The key idea of the proposed technique is to combine the performances of the fuzzy logic and the sliding mode control in order to improve the generated power for a given set of climatic conditions. Different from traditional sliding mode control, the developed FSMC integrates two parts. The first part uses a fuzzy logic controller with two inputs and 25 rules as an equivalent controller while the second part is designed for an online adjusting of the switching controller’s gain using a fuzzy tuner with one input and one output. Simulation results showed the effectiveness of the proposed approach achieving maximum power point. The fuzzy sliding mode (FSM) controller takes less time to track the maximum power point, reduced the oscillation around the operating point and also removed the chattering phenomena that could lead to decrease the efficiency of the photovoltaic system.
Volume: 7
Issue: 3
Page: 964-973
Publish at: 2016-09-01

IoT Based Wind/Solar Hybird Inverter

10.11591/ijaas.v5.i3.pp137-140
Ajeeth Kumar S. , Shabarish G. , Kishore Kannan A.
Paper deals with power control of a wind and solar hybrid generation system for connection operation with electric distribution system. Power control strategy is to extract the maximum energy available from varying condition of wind speed and solar irradiance while maintaining power quality at a safety level. In order to verify the maximum power variable speed control is come for wind turbine and maximum power is applied for PV system.  Inverter transfers the energy from the wind turbine and PV array into the grid by keeping common dc voltage constant. To ensure safety these inverters automatically shut down in the event of: High/Low AC-voltage; High/Low frequency; IOT is a key feature in which safety measurement is current and voltage.  The results show the control performance and  behavior of the wind/PV system .solar and wind are major possible ways were energy level are stored  in  battery, we implement to ensure that power transmission ways in hybrid pv/wind power are stored properly in batteries. Our aim is to monitor the current and voltage by means of IOT. The wave distribution of voltage and current is checked rapidly by using IOT. Non regular checking of voltage and current leads to total damage. And so we ensure that damage are monitored over IOT, variable power raise and drop are checked over by IOT. PV and wind  power.
Volume: 5
Issue: 3
Page: 137-140
Publish at: 2016-09-01

Design and Simulation of PFC Converter for Brushless SRM Drive

10.11591/ijpeds.v7.i3.pp625-637
M. Rama Subbamma , V. Madhusudhan , K.S.R Anjaneyulu
In most of the industrial applications, Switched Reluctance Motor (SRM) is mainly employed due to the reasons like having low maintenance and high efficiency. SRM consists of windings only on its stator, but would not have any windings on rotor thus having very simple construction. The available supply is AC. But AC cannot be directly supplied to SRM when used for air-conditioner application which is employed in this paper. Also power factor in the system needs to be corrected when using a SRM drive. Thus AC supply is fed to power factor correction (PFC) converter which is Buck-Boost converter here in this paper. The output of the PFC converter is fed to SRM through a simple asymmetrical converter. This PFC circuit consists of a simple diode bridge rectifier with Buck-Boost DC-DC converter. A suitable control circuit was proposed to control the input power factor under various loading conditions. This paper gives analysis of SRM drive for air-conditioner application with Buck-Boost converter based PFC circuit. A Matlab/simulink based model is developed and simulation results are presented. Simulation is carried out for different speed response.
Volume: 7
Issue: 3
Page: 625-637
Publish at: 2016-09-01

A Novel Power Factor Correction Modified Bridge Less-CUK Converter for LED Lamp Applications

10.11591/ijpeds.v7.i3.pp880-891
Saravanan D , Gopinath M
In recent decades, several research works have been focused on the efficient Power Factor Correction (PFC) converter design in to meet the power supply efficiency. Conventional PFC cuk converter widely uses the full bridge rectifier which had resulted in overall increase of converter losses and inefficiency. This paper is intended to develop a novel PFC Bridgeless cuk converter for LED lamp applications. In this work, the limitations of the conventional PFC Cuk converter are resolved. The major contributions of the proposed work include the minimization in the number of conduction devices and minimization of the power utility devices which in turn resulted in minimal losses and better efficiency. Moreover, the proposed converter works in DCM which requires only one voltage sensor which results in reduced cost. The proposed Modified BL Cuk converter (MBL-CUK) for LED lamp is simulated in MATLAB and the corresponding results show the better power quality indices such as power factor and Total Harmonic Distortion.
Volume: 7
Issue: 3
Page: 880-891
Publish at: 2016-09-01

Identification of the Inrush Current of the Internal Faults of Power Transformers Based on the Differential Relay Function

10.11591/ijaas.v5.i3.pp141-148
Majid Salimi
The inrush current of transformer is one of the most important factors in the damaging of power transformers and reducing their useful life. Differential relays are one of the main and primary protections of power transformers. Therefore, the correct and fast operation of these devices is so important. In this paper, an inrush flow detection method is proposed in order to prevent the inaccurate performance of differential relay. In the proposed method, the analysis of the wavelet transform frequency time is used based on the extracted characteristics. Also, a criterion called correlation coefficient is used in order to create a suitable pattern and use it in the proposed algorithm. The simulation of the proposed algorithm is performed by the PSCAD software and implemented in the MATLAB environment. The results of the simulation confirm the accuracy of the proposed method.
Volume: 5
Issue: 3
Page: 141-148
Publish at: 2016-09-01

Car Service Spare Parts Procurement Process Improvements Based on SOA

10.11591/ijeecs.v3.i3.pp554-563
Yue You , Yingcheng Xu , Li Wang
There are many kinds of automobile after-sale service spare parts, which are with a complex relationship in replacement and a large time span in models. The management of automobile after-sale service spare parts is a challenge, not only for automobile manufacturer but also for distributor. Therefore, it becomes an important and difficult task for automobile enterprises to do well in the supply of after-sale service spare parts, but also a target for automobile enterprises to explore and pursue continuously. Taking FAW-Volkswagen Automobile Co. Ltd. as the background, we conducted analysis on its procurement management process of spare parts; we also made some improvements on its process and pushed forward the corresponding products and solutions based on SOA (Service-oriented architecture) framework, so as to improve the procurement efficiency of automobile spare parts, and save cost.
Volume: 3
Issue: 3
Page: 554-563
Publish at: 2016-09-01

Reduction of Cogging Torque by Adapting Bifurcated Stator Slots and Minimization Of Harmonics And Torque Ripple in Brushless DC Motor

10.11591/ijpeds.v7.i3.pp781-789
M. Arun Noyal Doss , K. Mohanraj , V. Kalyanasundaram , K. Karthik
This paper proposes an improved methodology to minimize the cogging torque, harmonics and torque ripples in Brushless DC (BLDC) motor. The cogging torque is reduced by designing the BLDC motor with bifurcated active surface area using Finite Element Analysis (FEA). The harmonics and torque ripple is minimized using PI and Fuzzy controllers. These controllers are analyzed to bring out an optimal solution. The effectiveness and flexibility of the individual techniques of proposed control method is verified through simulations [Matlab Simulink]. The experimental result is shown only for fuzzy control because fuzzy is better comparing the performance of PI controllers.
Volume: 7
Issue: 3
Page: 781-789
Publish at: 2016-09-01

A Simple Three-term Conjugate Gradient Algorithm for Solving Symmetric Systems of Nonlinear Equations

10.11591/ijaas.v5.i3.pp118-127
M. Y. Waziri , L. Muhammad , J. Sabi’u
This paper presents a simple three-terms Conjugate Gradient algorithm for solving Large-Scale systems of nonlinear equations without computing Jacobian and gradient via the special structure of the underlying function. This three term CG of the proposed method has an advantage of solving relatively large-scale problems, with lower storage requirement compared to some existing methods. By incoporating the Powel restart approach in to the algorithm, we prove the global convergence of the proposed method with a derivative free line search under suitable assumtions. The numerical results are presented which show that the proposed method is promising.
Volume: 5
Issue: 3
Page: 118-127
Publish at: 2016-09-01
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