Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,393 Article Results

Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

10.11591/ijpeds.v8.i1.pp125-129
Phu Tran Tin , Nguyen Huu Khanh Nhan , Tran Hoang Quang Minh
LED technology had a huge development in recent years with major benefits: long-life, high-efficiency, excellent performance, compactness. In this work, an innovative method for improving the performance of multi-chip white LED lamps (MCW-LEDs) by adding the green Ce0.67 Tb0.33 MgAl11 O19:Ce,Tb (CeTb) phosphor to their in-cup phosphor compounding is proposed, investigated and demonstrated. Firstly, CeTb was mixed to the in-cup phosphor package of MCW-LEDs. Then by varying CeTb concentration, lumen output and angular color uniformity (ACU) of MCW-LEDs was calculated and analyzed. The results showed that the lumen output and the ACU of 7000 K and 8500 K MCW-LEDs increased significantly in comparison with others related works. This method is a prospective ideal for future improving LED manufacture.
Volume: 8
Issue: 1
Page: 125-129
Publish at: 2017-03-01

Power Control of DFIG-generators for Wind Turbines Variable-speed

10.11591/ijpeds.v8.i1.pp444-453
Ihedrane Yasmine , El Bekkali Chakib , Bossoufi Badre
In this paper, we focus on the modeling and control of a wind power system based on a double-fed induction generator DFIG. We proposed a technique of active and reactive power control to improve the performance and dynamics of variable speed wind system. The objective of the modeling is to apply the direct and indirect vector control stator flux orientation to control independently, the active and reactive power generated doubly-fed induction generator (DFIG). The simulation results are tested and compared in order to evaluate the performance of the proposed system.
Volume: 8
Issue: 1
Page: 444-453
Publish at: 2017-03-01

Single Switched Non-isolated High Gain Converter

10.11591/ijpeds.v8.i1.pp20-30
Lopamudra Mitra , Ullash Kumar Rout
This paper presents a new single switched inductor- capacitor coupled transformer-less high gain DC-DC converter which can be used in renewable energy sources like PV, fuel cell in which the low DC output voltage is to be converted into high dc output voltage. With the varying low input voltages, the output of DC-DC converter remains same and does not change. A state space model of the converter is also presented in the paper. This constant output voltage is obtained by close loop control of converter using PID controller. High voltage gain of 10 is obtained without use of transformer. All the simulations are done in MATLAB-SIMULINK environment.
Volume: 8
Issue: 1
Page: 20-30
Publish at: 2017-03-01

Quasi-Z-Source Inverter Topologies with Reduced Device Rating: a Review

10.11591/ijpeds.v8.i1.pp325-334
V. Raghavendra Rajan , Premalatha L.
Quasi-Z-Source Inverter (QZSI) has introduced a new wave of interest in engineering industry and research. Reduction in device rating has been the main objective in introducing QZSI topologies. The introduced topologies in QZSI have proven to be feasible in a wide range for high power with medium voltage applications. This paper mainly focuses on QZSI topologies with continuous input current conduction and also power conditioning in the renewable energy system. Based on a detailed comparison of these topologies suitable QZSI can be arrived for a given application.
Volume: 8
Issue: 1
Page: 325-334
Publish at: 2017-03-01

Design and Performance of 8Slot-12Pole Permanent Magnet Flux Switching Machines for Electric Bicycle Application

10.11591/ijpeds.v8.i1.pp248-254
Laili Iwani Jusoh , Erwan Sulaiman , Rajesh Kumar , Fatihah Shafiqah Bahrim
This paper presents a new design and performance of single phase permanent magnet flux-switching machine (PMFSM) for electric bicycle application. 8Slot-12Pole design machine were choose by analyzing the highest power density value. All active parts such as permanent magnet and armature coil are located on the stator, while the rotor part consists of only single piece iron. PMFSM have a great advantage with robust rotor structure that make it much higher power and applicable for EV application compared to SRM and IPMSM. The design, operating principles, characteristics of torque, and power of this new topology are investigated by JMAG-Designer via a 2D-FEA. Size of motor and volume of PM is designed at 75mm and 80g, respectively. Based on the investigation, it can be concluded that the proposed topology of single phase 8Slot 12Pole PMFSM achieved the target of highest performance of power density, approximately at 0.113W/mm3 with reduced permanent magnet and size of design motor. Due to the low torque performance of this initial design, further works is ongoing to improve the torque performance. In future work, outer rotor PMFSM structure design will be presented and compared with the “Deterministic Optimization Method” to improve the initial design.
Volume: 8
Issue: 1
Page: 248-254
Publish at: 2017-03-01

A Novel Sensorless Initial Rotor Position Estimation Method for Permanent Magnet Synchronous Motors

10.11591/ijpeds.v8.i1.pp156-166
Chien-Feng Wu , Shir-Kuan Lin
This paper presents a high efficiency initial rotor position estimation method for Permanent Magnet Synchronous Motors (PMSM). The approach uses the viable inductance model to analyze the optimal motor injection sine wave frequency as the motor’s test signal. Unlike other high-frequency injection methods, this approach does not require trial and error experiments. The injection frequency is identified by programmable simulations using Matlab. Experimental evaluation of 3-phase PMSM showed that this injection frequency optimization method works successfully. The proposed method can find the optimal injection frequency without experimentation, and outperforms other test signals in terms of accuracy, vibration quantity and noise. This microprocessor-developed 3-phase PMSM control driver can be applied to electrical appliances, machine tools and automation.
Volume: 8
Issue: 1
Page: 156-166
Publish at: 2017-03-01

Adaptive Method for Power Quality Improvement through Minimization of Harmonics Using Artificial Intelligence

10.11591/ijpeds.v8.i1.pp470-482
P. Thirumoorthi , Raheni T D
Power system harmonics are a menace to electric power system with disastrous consequence. Due to the presence of non linear load, power quality of the system gets affected.  To overcome this, shunt active power filter have been used near harmonic producing loads or at the point of common coupling to block current harmonics. The shunt active power filter is designed to minimize harmonics in source current and reactive power in the non linear power supplies which are creating harmonics. In this paper, Instantaneous power of p-q theory is employed to generate the reference currents and PI controller is used to control the dc link voltage. In addition to this, Artificial Intelligence (AI) technique is used to minimize the harmonics produced by nonlinear load. The main objective of this paper is to analyze and compare THD of the source current with PI controller and by artificial neural network based back propagation algorithm. The proposed system is designed with MATLAB/SIMULINK environment.
Volume: 8
Issue: 1
Page: 470-482
Publish at: 2017-03-01

Performance of Interconnection and Damping Assignment Passivity-Based Controller on Inverter Circuits

10.11591/ijpeds.v8.i1.pp69-80
N. H. Ramlan , N. A. Azli , N. F. A. A. Hafidz
This paper presents an extension work on the application of interconnection and damping assignment passivity-based controller (IDA-PBC) from the conventional H-bridge inverter to a 5-level Cascaded H-bridge Multilevel Inverter (CHMI). With the controller, the inductor current and the voltage capacitor track the desired reference of the inverter to ensure that the output voltage maintains its regulation while the Total Harmonic Distortion (THD) is kept at low levels with fast transient response. It is designed based on the Port-Control Hamiltonian theory exploiting the dissipation properties of the averaged model of inverter circuits.  The results obtained have proven that the IDA-PBC previously developed for the H-bridge inverter can be easily extended and applied to the CHMI circuit. The simulation results showed that the IDA-PBC is able to maintain the output voltage regulation in both circuits in the case of no-load to full-load condition, load uncertainty, and structural uncertainty while maintaining THD of less than 5%. However, in all cases, CHMI has shown better performance in terms of THD percentage and transient response compared to the H-bridge inverter, which are 290 µs and 150 µs respectively.
Volume: 8
Issue: 1
Page: 69-80
Publish at: 2017-03-01

Savonius Wind Turbine Performances on Wind Concentrator

10.11591/ijpeds.v8.i1.pp376-383
Dygku. Asmanissa Awg. Osman , Norzanah Rosmin , Nor Shahida Hasan , Baharruddin Ishak , Aede Hatib Mustaamal@Jamal , Mariyati Marzuki
The air streams from the outlet of an air compressor can be used to generate electricity. For instance, if a micro-sized Vertical-Axis Wind-Turbine (VAWT) is installed towards the airflow, some amount of electricity can be generated before being stored in a battery bank. The research’s objectives are to design, fabricate and analyze the performance of Helical Savonius VAWT blade rotors, which is tested with and without using a wind concentrator. The Helical Savonius VAWT is tested at 0 cm without the concentrator, whereas the blade rotor is tested at concave-blade position when using the concentrator. The blade and the wind concentrator designs were based on the dimensions and the constant airflow of the air compressor. The findings suggested that the blade produced its best performance when tested using wind concentrator at concave-blade position in terms of angular speed (ω), tip speed ratio (TSR) and the generated electrical power (PE). The findings concluded that the addition of wind concentrator increases the airflow which then provided better performances on the blades.
Volume: 8
Issue: 1
Page: 376-383
Publish at: 2017-03-01

Reduction in Current THD of Grid Parallel Inverters Using Randomized PR Control

10.11591/ijpeds.v8.i1.pp290-296
S. Salimin , S. A. Zulkifli , M. Armstrong
In grid connected system, unity power factor current injection into the grid is vital. This can be achieved by choosing the right inverter topology, passive filter components, current controllers, and PWM switching scheme. This paper compares the output current harmonics profile between when using the conventional proportional resonant (PR) current controller and when using the modified PR current controller. By applying the latter technique, via experimental validation using TMS320F2812, the THD of the injected grid current in a parallel connected inverters system is improved.
Volume: 8
Issue: 1
Page: 290-296
Publish at: 2017-03-01

Evaluation of PCB Shielding Characteristic in Near Field

10.11591/ijeecs.v5.i3.pp542-548
Yih Jian Chuah , Mohd Tafir Mustaffa
Wireless electronic devices nowadays always operate in high frequency while having small and compact form factor which led to electromagnetic interference among traces and components. PCB shielding is the common solution applied in electronic industry to mitigate electromagnetic interference. In this paper, PCB shielding characteristics such as shield’s thickness, height, and ground via spacing in PCB boards were evaluated in near field. Test boards with various ground via spacing were fabricated and evaluated by using 3D Electromagnetic scanner. On the other hand, shields with various thickness and height were modeled and evaluated through simulation. Results suggested that shielding effectiveness could be improved by having greater shield’s height with smaller ground via spacing in shielding ground tracks. Shielding effectiveness can be improved by 1 dB with every step of 0.5 mm increase in shield’s height. Besides that, approximately 0.5 dB improvement in shielding effectiveness with every step of 1 mm decrease in ground via spacing. Furthermore, greater shield’s thickness can contribute better shielding effectiveness for operating frequency below 300 MHz.
Volume: 5
Issue: 3
Page: 542-548
Publish at: 2017-03-01

An Automated Feeding System for Soft Shell Crab

10.11591/ijeecs.v5.i3.pp564-568
Muhammad Niswar , Zahir Zainuddin , Yushinta Fujaya , Zagita Marna Putra
Soft shell crab farming has been practiced in south-east Asian countries such as Indonesia. Soft shell crabs are harvested when they have just molted to prevent their shells from being hardened. An issue arises when feeding the crabs. Farmers need to feed the crabs 5% food of their body weight. However, farmers sometimes provide incorrect amounts of food to the crabs. If farmers feed the crab exceeding the required amounts of food, it causes food wastage and dirty water in the crabs’ cage. On the other hand, less amounts of food causes slow growth and molting of the crabs. In this study, we developed an automated feeding system for properly feeding of soft-shell crabs. The automated feeding system schedules the feeding time and controls the portion of food using a microcontroller. We also developed a web-based monitoring system to monitor and generate alert message to farmers to make sure that feeding process runs properly.
Volume: 5
Issue: 3
Page: 564-568
Publish at: 2017-03-01

Analysis of Three and Five-phase Double Stator Slotted Rotor Permanent Magnet Generator (DSSR-PMG)

10.11591/ijpeds.v8.i1.pp213-221
R. Suhairi , R. N. Firdaus , F. Azhar , K.A. Karim , A. Jidin , A. Khamis , Z. Ibrahim , T. Sutikno
This paper discusses the performance of three and five-phase double stator slotted rotor permanent magnet generator (DSSR-PMG). The objective of this research is to propose  five-phase DSSR-PMG structure that could minimize output voltage ripple compared to three phase. In this research Finite Element Analysis (FEA) is used to simulate the characteristic of the three and five-phase permanent magnet generator at various speeds. The characteristic of back-EMF, flux linkage, cogging torque and flux density for three and five-phase configurations is presented. As a result, five-phase DSSR-PMG shows a lower cogging  torque and voltage ripple compared to three-phase. The cogging torque for five-phase is 80% lower than three-phase DSSR-PMG and the ripple voltage (peak to peak) of back-EMF in five-phase is 2.3% compared to the three-phase DSSR-PMG which is 55%.
Volume: 8
Issue: 1
Page: 213-221
Publish at: 2017-03-01

Cross-Connected Source Multilevel Inverter for Active Power Filtering Using Unified Constant-Frequency Integration Control

10.11591/ijpeds.v8.i1.pp117-124
Hairol Jaffar , Naziha Ahmad Azli
This paper proposes an Active Power Filter (APF) system which utilizes a five-level nonconventional Cross-Connected Source Multilevel Inverter (CCSMI) with a modified Unified Constant-Frequency Integration (UCI) control. The CCSMI consists of six power switches which can produce five output voltage levels. With the use of the CCSMI, the parts count is reduced with equivalent or better performance compared to the use of conventional multilevel inverters. The capability of the proposed system is tested using three types of nonlinear loads with different characteristics. The APF system is simulated under steady-state condition using MATLAB/Simulink. The results obtained show improvement in the supply current Total Harmonic Distortion (THD) with room for enhancement, using the proposed APF system.
Volume: 8
Issue: 1
Page: 117-124
Publish at: 2017-03-01

Heavy Metal Uptake of Corn Irrigated with Human Urine

10.11591/ijaas.v6.i1.pp1-5
Horacio Sabejon Factura
Pit latrine (PL) is one of the most common disposal systems for human excreta in low-income countries but because it is a hole in the ground, infiltration of liquid effluent into the soil can continuously occur. Poor sanitation systems permit the spread of heavy metals in urine to water bodies especially the groundwater. This study investigated the accumulation of heavy metals in shoots of corn plants irrigated with urine. A pot experiment with corn was conducted under greenhouse conditions. Urine was diluted to 3:1 ratio (water and urine respectively) and was compared to control (water only). Using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), heavy metals such as Boron, Barium, Cobalt, Copper, Iron, Manganese, Nickel, Silicon, Strontium and Zinc were detected in shoots of all plants with contents ranging from 0.22 to 2,487.44 milligram (mg) per kilogram (kg). The higher amounts detected in urine irrigated plants than the control proved the presence of the metals in the urine. Reuse of urine will definitely benefit farmers while at the same time reduce the risk of heavy metal contamination in groundwater.
Volume: 6
Issue: 1
Page: 1-5
Publish at: 2017-03-01
1 2 3
...
1959 1960
Show 1541 of 1960

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration