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27,404 Article Results

Density Based Clustering of Hotspots in Peatland with Road and River as Physical Obstacles

10.11591/ijeecs.v3.i3.pp714-720
Prima Trie Wijaya , Imas Sukaesih Sitanggang , Lailan Syaufina
Indonesia has the largest peatland area among tropical countries, covering about 21 milions ha, which spread mainly in Sumatera, Kalimantan, and Papua. Land and forest fires occur almost every year in peatland areas in Indonesia. One of indicators for forest and land fires is hotspot. The objective of this study is to group hotspots with road and river as obstacles using the CPO-WCC (Clustering in Presence of Obstacles with Computed number of Cells) algorithm. Clusters of hotspot data were analyzed based on peatland area distribution. This study also evaluates the results of clustering on peatlands in order to obtain the best clusters. Clustering using CPO-WCC algorithm produces three clusters of hotspot. The area of dense cluster is 10202.10 km2 with number of hotspots per km2 is 0.985. The higest number of hotspots occurrence is found in peatland with type of Hemists /Saprists (60/40) and depth greater than 400 cm.
Volume: 3
Issue: 3
Page: 714-720
Publish at: 2016-09-01

Automatic Generation Control of Two Equal Areas with Traditional Controllers

10.11591/ijpeds.v7.i3.pp610-616
Ankita Rani , Harinder Singh , Krishan Arora
Automatic generation control (AGC) is major issue in power system whose main purpose is to maintain the frequency and tie line power flow during normal period in an interconnected system. . Thus, It is the responsibility of the Power system engineers to ensure that adequate power is delivered to the load reliably and economically so that nominal condition will be re-established The main focus is to maintain the value of frequency in its prescribed limit. We use renewable source which are important as well as non renewable sources at the level of extinct. As renewable alone cannot reliable then we use interconnection of both for making the system reliable and more efficient.This research paper is devoted to explore the interconnection of the automatic generation control of hydro power system and wind system. The wind system is comprised with governor dead band, generation rate constraint and turbine dynamics where as the hydro system is comprised with generation rate constraint. The traditional PI controller does not have adequate control performance with the consideration of nonlinearities and turbine dynamics. To overcome this drawback, PID controllers helps in solving optimization problems by exploitation of random search. It will provide the system security also for maintain the frequency in prescribed limit with the help of simulation.
Volume: 7
Issue: 3
Page: 610-616
Publish at: 2016-09-01

A Review on Designand Control Methods of Modular Multilevel Converter

10.11591/ijpeds.v7.i3.pp863-871
Ramya G , Ramaprabha R
Modular multilevel converters (MMC) are an emerging voltage source converter topology suitable for many applications. Due to abundant utilization of HVDC power transmission, the modular multilevel converter has become popular converter type to be used in high voltage applications. Other applications include interfacing renewable energy power sources to the grid and motor drives. Modular multilevel converters are beneficial for high voltage and high power motor drives because of the properties of this converter topology, such as, low distortion, high efficiency, etc. For the past few years significant research has been carried out to address the technical challenges associated with operation and voltage balancing of MMC. In this paper, a detailed technical review on the control strategies is presented for ready reference.
Volume: 7
Issue: 3
Page: 863-871
Publish at: 2016-09-01

A new Backstepping Sliding Mode Controller applied to a DC-DC Boost Converter

10.11591/ijpeds.v7.i3.pp759-768
Yosra Massaoudi , Dorsaf Elleuch , Jean Paul Gaubert , Driss Mehdi , Tarak Damak
In order to deal with the boost converter  non minimum phase property and to solve the Sliding Mode Control (SMC) major problem (the chattering phenomenon), a new backstepping Sliding Mode Controller is developed. In this paper, a comparative study between the proposed controller and the (2-SMC)super twisting  and the classical SMC is provided in order to evaluate each controller. Simulations and experimental results show the effectiveness and the robustness of the proposed controller with respect to load variation.
Volume: 7
Issue: 3
Page: 759-768
Publish at: 2016-09-01

A Review on Design and Development of high Reliable Hybrid Energy Systems with Droop Control Techniques

10.11591/ijpeds.v7.i3.pp974-981
G. Srinivasa Rao , K. Harinadha Reddy
Hybrid Energy system is a combination of two or more different types of energy resources. Now a day this hybrid energy system plays key role in various remote area power applications. Hybrid energy system is more reliable than single energy system. This paper deals with high reliable hybrid energy system with solar, wind and micro hydro resources. The proposed hybrid system cable of multi mode operation and high reliable due to non communicated based controllers (Droop Characteristic Control) are used for optimal power sharing.  size of battery can be reduced because hydro used as back up source and Maximum power point Tracking also applied to solar and wind energy systems.
Volume: 7
Issue: 3
Page: 974-981
Publish at: 2016-09-01

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
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