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28,188 Article Results

Comparison Of Cascaded H-bridge Inverters for Harmonic Mitigation Considering Various Loads

10.11591/ijpeds.v8.i1.pp10-19
Suresh Natarajan , R. Samuel Rajesh
This paper compares the reduction of harmonics in various level cascaded H-bridge inverters. The switching angles for the cascaded H-bridge inverter were calculated by evolutionary optimization technique. Fourier analysis is used to determine the switching angles for the desired electrical parameters. Lower order harmonics such as third, fifth, seventh, ninth and eleventh order harmonics were taken into consideration to reduce the total harmonic distortion. Simulation was done for thirteen, fifteen and seventeen level cascaded H-bridge inverters using Matlab. Total harmonic distortion of voltage and current for R, RL and  Motor load were analyzed.
Volume: 8
Issue: 1
Page: 10-19
Publish at: 2017-03-01

Analysis of Superconducting Fault Current Limiter in DC System with Renewable Energy Sources

10.11591/ijaas.v6.i1.pp64-69
S. Sanjeeva Rayudu , C. Ganesh , B.Vignesh Naik
Superconducting fault-current limiters (SFCLs) have been the subject of research and development for many years and offer an attractive solution to the problem of rising fault levels in electrical distribution systems.  SFCLs can greatly reduce fault currents and the damage at the point of fault, and help improve the stability of a power system. Superconducting fault-current limiters (SFCL) provide a  new efficient approach to the reliable handling of such  faults.(SCFLs) can be used for various nominal voltages and currents, and can  be  adapted  to  particular  limiting  characteristics  in  case  of  short  circuits. In this project, dc resistive type superconducting fault current limiter (SFCL) is presented. This SFCL is designed for the HVDC system.  Uniform current and voltage sharing among the SFCL modules can be observed through contact resistance tests, dc flow-through tests, and ac flow-through tests. Results of tests show that each limiting module has good uniformity in higher current system. The proposed concept can be implemented using renewable energy sources. The results are presented by using Matlab/simulink platform.
Volume: 6
Issue: 1
Page: 64-69
Publish at: 2017-03-01

Power Quality Improvement Using Multi-level Inverter based DVR and DSTATCOM Using Neuro-fuzzy Controller

10.11591/ijpeds.v8.i1.pp316-324
G. Ramya , V. Ganapathy , P. Suresh
STATCOM is one of the shunt type FACTS controllers which can supply reactive power and improve bus voltage. STATCOM, a controlling device used on alternating current transmission networks, has advantages like transient free switching and smooth variation of reactive power. This paper proposes a cascaded multilevel inverter type DSTATCOM and DVR to compensate voltage sag in utilities in power distribution network. The proposed DSTATCOM is implemented using multilevel topology with isolated dc energy storage and reduced number of switches. A DVR injects a voltage in series with the system voltage and a D-STATCOM implant a current into the system to correct the voltage sag, swell and interruption. The phase shifter PWM technique is described to generate firing pulse to cascaded inverter. The proposed neuro-fuzzy controller follow itself to the sag and provides effective means of mitigation. The voltage sag with the minimum harmonic at the efficacy end. The proposed technique is simulated using MATLAB/Simulink.
Volume: 8
Issue: 1
Page: 316-324
Publish at: 2017-03-01

MTKD: An Algorithm for Multi-Tier Key Distribution for Securing Group Communication in WSN

10.11591/ijaas.v6.i1.pp23-31
Annapurna H S , M. Siddappa
Security is one of the inherent challenges in the area of wireless sensor network. At present, majoroty of the security algorithm are incorporated with massive iterations of cryptography as well as complex mathematical modelling that result in degradation of quality of service. The present paper takes the case study of group communication in wireless sensor network and introduces a significant protocol that assist in generation of joint key with an aid of unique and lightweight cryptography. The outcome of the study was compared with the most significant and standard work of group communication to find that proposed system is in adherence of time and space complexity.
Volume: 6
Issue: 1
Page: 23-31
Publish at: 2017-03-01

Congestion Aware Multi-Path Routing Protocol with Load Balancing

10.11591/ijaas.v6.i1.pp6-11
K.Sangeetha Supriya , M.Gopi Chand , K.Raja Sekhar
The multi-path routing protocol is one of the approaches used to have less overhead, better bandwidth cost through the load distribution among a set of paths. However, due to the interference of the paths during the communication, it increases the end to end delay and do not work well under a highly congested network. We have proposed the congestion aware multi-path routing protocol with load balancing. The paper explains the problem associated with the end-to-end delay. It deals with the problem of channel interference during the Multi-path communication. It suggests the congestion control mechanisms to improve the protocol performance. It proposes an additive increase/ multiplicative decrease and fast retransmits and recovery process and also it suggest the algorithm for load balancing scheme. In order to minimize the congestion formation, it selects the node disjoint paths for communication. The correlation factor among the selected multiple paths are calculated. It calculates the congestion formation in the network. It compares the proposed MPR protocol with ordinary DSR through the simulation and the simulation results are discussed.
Volume: 6
Issue: 1
Page: 6-11
Publish at: 2017-03-01

Design Improvement of Three Phase 12Slot-14Pole Outer Rotor Field Excitation Flux Switching Motor

10.11591/ijpeds.v8.i1.pp239-247
S.M.N.S. Othman , M.Z. Ahmad , J.A. Rahim , F.S. Bahrim , E. Sulaiman
This paper present with design improvement of 12Slot-14Pole outer rotor field excitation flux switching motor (ORFEFSM) from the initial design by implement Deterministic Optimization Method (DOM) which involve 2-dimensional Finite-Element Analysis (FEA). The design improvement starts with the non-active part, rotor and followed with active part, stator which involve the armature coil slot and field excitation coil (FEC) slot. Since it is one of local optimization method, this method involves more than one cycle of improvement depends on the design structure and slot-pole configuration until achieve optimum performance. However, the initial torque and power output of 12Slot-14Pole is 112.95 Nm and 50.46 kW. The main objective is to improve the structure in order to obtain optimum torque and power output. Besides, it is necessary to reduce flux saturation and optimize the flux flow between the rotor teeth and stator arc width. The target torque and power output performance is expected higher than 210 Nm and 123 kW. With the deterministic optimization method technique, the final torque and power output achived are 221.83 Nm and 189kW.
Volume: 8
Issue: 1
Page: 239-247
Publish at: 2017-03-01

Design of Robust Load Frequency Controller for Multi-Area Interconnected Power System Using SDO Software

10.11591/ijaas.v6.i1.pp12-22
Pasala Gopi , P. Linga Reddy
The response of the load frequency control problem in multi-area interconnected electrical power system is much more complex with increasing size, changing structure and increasing load.  This paper deals with Load Frequency Control of three area interconnected Power system incorporating Reheat, Non-reheat and Reheat turbines in all areas respectively.  The response of the load frequency control problem in a multi-area interconnected power system is improved by designing PID controller using different tuning techniques and proved that the PID controller which was designed by Simulink Design Optimization (SDO) Software gives the superior performance than other controllers for step perturbations. Finally the robustness of controller was checked against system parameter variations..
Volume: 6
Issue: 1
Page: 12-22
Publish at: 2017-03-01

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
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