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28,451 Article Results

Small Hydro Power Schemes: Technical Aspects

10.11591/ijaas.v6.i1.pp55-63
Hira Singh Sachdev , Ashok Kumar Akella
Small hydro systems play a major role in meeting power requirements of remote, isolated, hilly areas in a decentralized manner by tapping water streams, rivulets and canals of small discharge. Small hydroelectric system captures the energy in flowing water and converts it to electricity.Of all the non-conventional renewable energy sources, small hydro stands first as it is more resourceful, reduces system  losses, environment friendly, non-consumptive and source is renewable due to their enormous advantages over large hydro and other power plants, lot of small hydro-power plants have come up across the world to meet the ever increasing demand of electrical energy. Lowering the high initial cost of the small hydro-power plants and its popularization is today’s challenges. This paper describes basic techniques design of the small hydro-power development.
Volume: 6
Issue: 1
Page: 55-63
Publish at: 2017-03-01

Design of Wireless Acceleration Sensor Nodes Used in Mechanical Equipment Status Monitoring

10.11591/ijaas.v6.i1.pp42-48
G. Vamshi Kishore , J. Suresh
Wireless Sensor Network is a new integrated technology, which combines sensor technology, wireless communication technology, Micro-Electro-Mechanical Systems technology and Digital electronic technology. Now, it has been widely used in military, industrial control, environmental monitoring, transportation, and medical. Along with the research evolution on Wireless Sensor Network, its application fields are gradually expanding. It is penetrating deep into each aspect of the human’s production and life, and will be a new revolutionary technology. In this paper, a wireless acceleration node based on wireless single chip processor CC2430, an ARM7TDMI-S core based microcontroller called LPC2478 microprocessor and three-axis acceleration sensor ADXL330 is designed to monitor the mechanical system operation conditions and fault diagnosis with high efficiency. The performance and characteristics of CC2430, ADXL330 and LPC2478 are introduced compactly. The designations of hardware as well as software of wireless network node are introduced in details. The nodes perform steadily and efficiently in practical test, and it can be easily applied to other monitoring areas.
Volume: 6
Issue: 1
Page: 42-48
Publish at: 2017-03-01

A Robust EKF Based Speed Estimator and Fuzzy Optimization Technique for Sensorless Induction Motor Drives

10.11591/ijpeds.v8.i1.pp147-155
Mohana Lakshmi J. , Suresh H. N.
The speed estimation technique of induction machines has become a non-trivial task. For estimating the speed of an induction motor precisely and accurately an optimum state estimator is necessary. This paper deals with the performance analysis of induction motor drives using a recursive, optimum state estimator. This technique uses a full order state space Extended Kalman Filter (EKF) model where the rotor flux, rotor speed and stator currents are estimated. A major challenge with induction motor occurs at very low and at near zero speed. In such cases, information about the rotor parameters with respect to stator side become unobservable while using the synchronously rotating reference frame. To overcome this lost coupling effect, EKF observer linearizes the non-linear parameter in every sampling period and estimates the states and machine parameters simultaneously. The proposed algorithm is tuned to obtain least error in estimated speed. Any error found is further optimized using a non-linear fuzzy controller to obtain improved performance of the drive.
Volume: 8
Issue: 1
Page: 147-155
Publish at: 2017-03-01

Proton Exchange Membrane Fuel Cell Emulator Using PI Controlled Buck Converter

10.11591/ijpeds.v8.i1.pp462-469
Himadry Shekhar Das , Chee Wei Tan , AHM Yatim , Nik Din bin Muhamad
Alternative energy technologies are being popular for power generation applications nowadays. Among others, Fuel cell (FC) technology is quite popular. However, the FC unit is costly and vulnerable to any disturbances in input parameters. Thus, to perform research and experimentation, Fuel cell emulators (FCE) can be useful. FCEs can replicate actual FC behavior in different operating conditions. Thus, by using it the application area can be determined. In this study, a FCE system is modelled using MATLAB/Simulink®. The FCE system consists of a buck DC-DC converter and a proportional integral (PI) based controller incorporating an electrochemical model of proton exchange membrane fuel cell (PEMFC). The PEMFC model is used to generate reference voltage of the controller which takes the load current as a requirement. The characteristics are compared with Ballard Mark V 5kW PEMFC stack specifications obtained from the datasheet. The results show that the FCE system is a suitable replacement of real PEMFC stack and can be used for research and development purpose.
Volume: 8
Issue: 1
Page: 462-469
Publish at: 2017-03-01

Phase Sequence Online Correction Based on PIC Technique

10.11591/ijaas.v6.i1.pp49-54
Bilal A. Mubdir , Dara H. Amin
Monitoring the delivered power quality (PQ) to a critical load, is a worry issue since it is matter as much as critical or quality sensitive equipment connected to the electrical network. Various PQ problems such as noise, voltage imbalance, waveform distortion, phase imbalance, phase sequence, over voltage or sag are the most popular quality problems that could be detected and fixed if needed. The present work presents a design and practical implementation of electronic embedded system to monitoring the sequence of a three phase electrical system and detects the occurrence of any change in the sequence and fixes it online, correct the phase sequence immediately during less than 70 milli-seconds. PIC Microchip microcontroller has been used as the core of the present system, where the correction of the phases has been achieved by using traditional electromechanical relays. The system has been tested successfully and it functions properly even with multiple sequence changes.
Volume: 6
Issue: 1
Page: 49-54
Publish at: 2017-03-01

Design of Full-bridge DC-DC Converter 311/100 V 1kW with PSPWM Method to Get ZVS Condition

10.11591/ijpeds.v8.i1.pp59-68
Toni Prasetya , F. Danang Wijaya , Eka Firmansyah
Enhancing the switching frequency can increase the power density of a fullbridge dc-dc converter. However, power loss in switches will increase due to the intersection of voltage and current during turn-on and turn-off transition process. The switching power loss can be reduced by making the condition of zero voltage switching (ZVS) which in this study is obtained by using the phase-shifted PWM method. Achieving this condition requires appropriate parameters such as deadtime, leakage inductance, and the primary current of transformer in sufficient value. In this study, ZVS is achieved when the transformer leakage inductance of 14.12 μH is added with external inductance of 24.29 μH which is installed in series with transformer and when the primary current of transformer is more than 1.289 A.
Volume: 8
Issue: 1
Page: 59-68
Publish at: 2017-03-01

An Intelligent Power Management Investigation for Stand-alone Hybrid System Using Short-time Energy Storage

10.11591/ijpeds.v8.i1.pp367-375
Ben Slama Sami
Stand-alone Hybrid systems become appreciating issues that ensure the required electricity to consumers. The development of a stand-alone Hybrid system becomes a necessity for multiple applications The enhance energy security. To achieve this objective, we have proposed an accurate dynamic model using Multi-Agent System (MAS) in which a solar energy System (SES) serves as the main load supply, an energy Backup System (ERS) is based on a fuel cell and Electrolyzer for long-term energy storage and an Ultra Capacitor (UCap) storage system deployed as a short-time storage. To cooperate with all systems, an Intelligent Power Management (IPM) based on a specific MAS is included. Thus, to prove the performance of the system, we tested and simulated it using the Matlab/Simulink environment.
Volume: 8
Issue: 1
Page: 367-375
Publish at: 2017-03-01

Enhancing Students’ Communication Skills through Problem Posing and Presentation

10.11591/ijere.v6i1.6342
Sugito Sugito , Sri Mulyani Endang Susilowati , Hartono Hartono , Supartono Supartono
This study was to explore how enhance communication skill through problem posing and presentation method.  The subjects of this research were the seven grade students Junior High School, including 20 male and 14 female. This research was conducted in two cycles and each cycle consisted of four steps, they were: planning, action, observation, and reflection. This study use interview, observation, and questionnaire to measure most widely used data gathering in communication skill students, and daily test (pre-test and post-test) to measure enhance achievement the students’. The data was analyzed comparing initial and final score. If the final score is better than initial score had been enhanced. Results of this study indicated that teaching and learning science used problem posing and presentation method can enhance ability communication skill, confidence, courage and responsibility on themselves disciples. Researcher is suggestion to use another method to enhance communication skill.
Volume: 6
Issue: 1
Page: 17-22
Publish at: 2017-03-01

Higher-order Mode Rectangular Dielectric Resonator Antenna for 5G Applications

10.11591/ijeecs.v5.i3.pp584-592
Nor Hidayu Shahadan , Muhammad Ramlee Kamarudin , Mohd Haizal Jamaluddin , Yoshihide Yamada
The excitation of the higher-order mode, in rectangular dielectric resonator designed was explored to enhance the antenna gain and detailed elaboration is presented in this paper. The antenna was fed by a 50Ω microstrip line through an aperture cut in the ground plane. Besides avoiding spurious radiation, this feeding technique gives flexibility in controlling the amount of coupling in order to reduce the Q-factor in the higher-order mode RDRA. A design was developed and subsequently simulated using Ansoft HFSS ver 16.0 by utilizing Duroid 5880 dielectric substrate with a thickness (ts) of 0.254 mm, a permittivity (εs) of 2.2 and a loss tangent (δ) of 0.001 at 15 GHz. The higher-order mode, RDRA achieved the measured gain at 9.76 dBi and the measured impedance bandwidth as much 2.5 GHz which is 4.7% more compared to the fundamental mode. The result should be considered suitable for 5G applications.
Volume: 5
Issue: 3
Page: 584-592
Publish at: 2017-03-01

An Efficient Control Implementation for Inverter Based Harmony Search Algorithm

10.11591/ijpeds.v8.i1.pp279-289
Mushtaq Najeeb , Hamdan Daniyal , Ramdan Razali , Muhamad Mansor
This research implements a PI controller based on harmony search (HS) optimization algorithm for voltage source inverter to improve the output performance under step load change conditions. The HS algorithm aims to handle the trial and error procedure used in finding the PI parameters and then apply the proposed control algorithm via the eZdsp TMS320F28355 board to link the inverter prototype with the Matlab Simulink. The mean absolute error (MAE) is used as an optimization problem to minimize the output voltage error for the developed controller (PI-HS) as compared to the PI controller based particale swarm optimization algorithm (PI-PSO). Based on the experimental results obtained, it is noted that the proposed controller (PI-HS) provides a good dynamic performance, robustness, constant voltage amplitude, and fast response in terms of overshoot, transient, and steady-state.
Volume: 8
Issue: 1
Page: 279-289
Publish at: 2017-03-01

Active Node Detection in A Reconfigurable Microgrid using Minimum Spanning Tree Algorithms

10.11591/ijeecs.v5.i3.pp502-507
Anay Majee , Souradeep Nanda , Gnana Swathika O.V
Microgrids are the solution to the growing demand for energy in the recent times. It has the potential to improve local reliability, reduce cost and increase penetration rates for distributed renewable energy generation. Inclusion of Renewable Energy Systems (RES) which have become the topic of discussion in the recent times due to acute energy crisis, causes the power flow in the microgrid to be bi-directional in nature. The presence of the RES in the microgrid system causes the grid to be reconfigurable. This reconfiguration might also occur due to load or utility grid connection and disconnection. Thus conventional protection strategies are not applicable to micro-grids and is hence challenging for engineers to protect the grid in a fault condition. In this paper various Minimum Spanning Tree (MST) algorithms are applied in microgrids to identify the active nodes of the current topology of the network in a heuristic approach and thereby generating a tree from the given network so that minimum number of nodes have to be disconnected from the network during fault clearance. In the paper we have chosen the IEEE-39 and IEEE-69 bus networks as our sample test systems.
Volume: 5
Issue: 3
Page: 502-507
Publish at: 2017-03-01

Material Development Based on Digital Storytelling Activities and Assessment of Students’ Views

10.11591/ijere.v6i1.6347
Ozlem Ayvaz Tunc
This study was designed as a case study. The study was conducted in Anatolian Fine Arts High School during the spring semester of 2014-2015 academic year. The sample of the study consisted of a total of 10 students from 9th and 10th grades who voluntarily participated in the study. Semi-structured interviews were conducted with the 10 students named at the end of every activity. Assure instructional design model was used while designing digital storytelling activities. The data obtained from the study were analyzed through thematic analysis based on qualitative research method. Reliability method suggested by Miles and Huberman was used for reliability assessment of the study. The reliability of the thematic coding of the results was found to be 0,95 as a result of assessments. Based on the findings that digital storytelling has multidisciplinary interaction competence, it is thought that it will be appropriate to conduct future studies in different schools and fields.  
Volume: 6
Issue: 1
Page: 54-63
Publish at: 2017-03-01

Variational Iteration Method for Solving Riccati Matrix Differential Equations

10.11591/ijeecs.v5.i3.pp673-683
Khalid Hammood Al-jiz , Noor Atinah Ahmad , Fadhel Subhi Fadhel
Riccati matrix differential equation has long been known to be so difficult to solve analytically and/or numerically. In this connection, most of the recent studies are concerned with the derivation of the necessary conditions that ensure the existence of the solution. Therefore, in this paper, He’s Variational iteration method is used to derive the general form of the iterative approximate sequence of solutions and then proved the convergence of the obtained sequence of approximate solutions to the exact solution. This proof is based on using the mathematical induction to derive a general formula for the upper bound proved to be converge to zero under certain conditions. 
Volume: 5
Issue: 3
Page: 673-683
Publish at: 2017-03-01

Motor Command and Supervision Using the Magnetic Components of the Insulation Fault Protection System for Power Line Communication

10.11591/ijpeds.v8.i1.pp204-212
Matias Fernando Bulacio , Hernan Emilio Tacca
This work proposes an additional function for a VSD (Variable Speed Drive) which sends and receives information over the power lines and simultaneously, implements the protection against insulation faults to earth. Using the magnetic components of the insulation fault protection system of the motor, the prototype injects and detects the communication signals over the power line. The system works on both communication schemes, with and without the PWM (Pulse Width Modulation) perturbation in the power lines, which are the two possible real applications. In order to set a proper communication between the motor and the drive, the communication channel was modeled and the noise was characterized. An FSK modulation and demodulation scheme was developed and tested. A 10 kbps communication over a 125 m length of cable and over a 1 km pi-section model of the same cable was successfully achieved with the laboratory prototype.
Volume: 8
Issue: 1
Page: 204-212
Publish at: 2017-03-01

Nurses’ Spirituality Improves Caring Behavior

10.11591/ijere.v6i1.6343
Abu Bakar , Nursalam Nursalam , Merryana Adriani , Kusnanto Kusnanto , Siti Nur Qomariah , Laily Hidayati , Ika Nur Pratiwi , Lailatun Ni'mah
Caring was the behavior provide assistance holistically to individuals. In fact, nurses Caring behaviors made only modest, yet an art in nursing care which should always be a nurse. The good personality and spiritual be one of the factors that affect the formation of nurses Caring behaviors. Spiritual was the passion or impulse that comes out from within themselves to do the noble. The research objective was explained a spiritual relationship nurses with nurses caring behaviors. The research design was used cross sectional. The population in this researchs were associate nurses in the ward. A sample were taken of 88 nurses with consecutive sampling technique. Data collection was done at the General Hospital of Haji Surabaya, Al Irsyad General Hospital Surabaya and Muhammadiyah Gresik Hospital. Data collection was used questionnaire, with multivariate data analysis Structural Equation Modeling- Partial Least Square (PLS-SEM). The results showed no significant relationship between demographic with spiritual nurses. Demographic indicators for the hypothesis test was psychological, length of work, education, and wards. Demographics nurses with nurse caring no significant relationship. Spiritual nurses significant relationship with the caring nurses at 7.061. These results indicated that modeling should be done was draw line from the spiritual to the caring nurses and the others deleted. The conclusion of the research was the spiritual nurses significant relationship with the nurses caring behaviors. Suggestions have to do is always give spiritual training to nurses as one of supporting the implementation of nursing care.
Volume: 6
Issue: 1
Page: 23-30
Publish at: 2017-03-01
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