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28,719 Article Results

Improvise 3-Level DTC of Induction Machine using Constant Switching Frequency Method by Utilizing Multiband Carrier

10.11591/ijpeds.v7.i3.pp638-647
Sundram a/l Ramahlingam , Auzani Bin Jidin , Tole Sutikno , L. Logan Raj
This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple. The major factorthat contributes to these problems the usage of hysteresis based comparators to control the output torque. The implementation of PI based constant switching method in DTC able to solve these problems while retaining the simple control structure of conventional DTC. The combination usage of 3-level CHMI in this system can further minimize the output torque ripple by providing greater number of vectors. This paper presents detail explanation and calculationof optimal PI parameter tuning strategyconsecutively to enhance the performance of 3-level DTC system. In order to validate the feasibility, the proposed method compared with convention DTC system via simulation and experiment results.
Volume: 7
Issue: 3
Page: 638-647
Publish at: 2016-09-01

Investigation of the Common Mode Voltage for a Neutral-Point-Clamped Multilevel Inverter Drive and its Innovative Elimination through SVPWM Switching-State Redundancy

10.11591/ijpeds.v7.i3.pp892-900
C. Bharatiraja , J.L. Munda , N. Sriramsai , T Sai Navaneesh
The purpose of this paper is to provide a comprehensive Investigations and its control on the common mode Voltage (CMV) of the three-phase three-level neutral-point diode-clamped (NPC) multilevel inverter (MLI). A widespread space-vector pulse width modulation (SVPWM) technique to mitigate the perpetual problem of the NPC-MLI, the CMV, proposed. The proposed scheme is an effectual blend of nearest three vector (NTV) and selected three vector (STV) techniques. This scheme is capable to reduce the CMV without compromise the inverter output voltage and Total harmonics distraction (THD). CMV reduction achieved less than +Vdc/6 using the proposed vector selection procedure. The theoretical Investigations, the MATLAB software based computer simulation and Field Programmable Gate Array (FPGA) supported hardware corroboration have shown the superiority of the proposed technique over the conventional SVPWM schemes.
Volume: 7
Issue: 3
Page: 892-900
Publish at: 2016-09-01

Hardware Implementation of Single Phase Power Factor Correction System using Micro-controller

10.11591/ijpeds.v7.i3.pp790-799
Kartikesh Kumar Jha , Bidyut Mahato , Prem Prakash , Kartick Chandra Jana
Rapid increase of consumers in electronics devices and the use of mains rectification circuits inside these electronic devices is the root cause of mains harmonic distortion. Automatic power factor correction techniques can be applied to the industries, power systems and households to make them stable inturns increases the efficiency of system as well as the apparatus. This paper deals with the hardware design of active power factor correction circuit employing boost converter which is used to boost the DC voltages with a controller based on PID control strategy. The pulses given to power switches by pulse width modulation techniques generated by utilizing micro-controller board, Arduino thus obviating the need of complex hardware circuitry. MATLAB/SIMULINK was used to design and tune the PID controller parameters. The simulation results are matching with the predictions and the same was implemented as hardware. The waveforms various test points and across capacitors were obtained, studied and compared with the theoretical waveforms and are found to be in precise proximity of theoretical waveforms.
Volume: 7
Issue: 3
Page: 790-799
Publish at: 2016-09-01

Voltage Instability Analysis for Electrical Power System Using Voltage Stabilty Margin and Modal Analysis

10.11591/ijeecs.v3.i3.pp655-662
Ahmad Fateh Mohamad Nor , Marizan Sulaiman , Aida Fazliana Abdul Kadir , Rosli Omar
Voltage instability analysis in electric power system is one of the most important factors in order to maintain the equilibrium of the power system. A power system is said to be unstable if the system is not able to maintain the voltage at all buses in the system remain unchanged after the system is being subjected to a disturbance.The research work presented in this paper is about the analysis of voltage instability of electric power system by using voltage stability margin (VSM), load real power (P) margin, reactive power (Q) margin, reactive power-voltage (QV) and real power-voltage (PV) modal analysis. IEEE 30-bus system has been chosen as the power system. The load flow analysis are simulated by using Power World Simulator software version 16. Both QV and PV modal analysis were done by using MATLAB application software.
Volume: 3
Issue: 3
Page: 655-662
Publish at: 2016-09-01

Intelligent Control for Doubly Fed Induction Generator Connected to the Electrical Network

10.11591/ijpeds.v7.i3.pp688-700
Anass Bakouri , Hassane Mahmoudi , Ahmed Abbou
In this paper we are interested in optimizing the wind power capture, using the Doubly Fed Induction Generator (DFIG). This machine is preferred to other types of variable speed generator because of their advantages in economic terms and control. The Artificial Neural Network (ANN) based on Direct Torque Control (DTC) which is used to control the electromagnetic torque in order to extract the maximum power, The  main  objective  of this intelligent technique is to replace the conventional switching table  by  a  voltage  selector  based  on  (ANN)  to  reduce torque  and  flux  ripples. Moreover, the fuzzy logic controller is used to grid side converter to keep DC link voltage constant, and also to achieve unity power factor operation. The main advantage of the two control strategies proposed in this paper is that they are not influenced by the variation of the machine parameter. The pitch control is also presented to limit the generator power at its rated value. Simulation results of 1,5 MW, for (DFIG) based Wind Energy Conversion System (WECS) confirm the effectiveness and the performance of the global proposed approaches.
Volume: 7
Issue: 3
Page: 688-700
Publish at: 2016-09-01

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
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