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31,377 Article Results

Indirect vector control for induction motor drive using two level and five level inverter

10.11591/ijape.v8.i2.pp134-144
Ankit Agrawal , Rakesh Singh Lodhi , Pragya Nema
This paper represent modelling & simulation of indirect vector control for induction motor drive using two level and five level inverter. To overcome of lower order harmonics, THD & speed torque characteristics of three phase squirrel cage induction motor. This paper provides solution through indirect vector control & SPWM technique for multilevel inverter. A comparison and performance of two level and five level inverter are used in motor to control speed, current and torque. Matlab simulation environment are taken to simulate indirect vector control for induction motor drive using two level and five level inverter, so torque ripple minimization, lower order harmonics are reduced, constant speed, constant torque and variable speed variable torque are determined through simulation results. The applications under operating conditions are performed better THD, better reliability in AC drives.
Volume: 8
Issue: 2
Page: 134-144
Publish at: 2019-08-01

Optimal incorporation of multiple distributed generation units based on a new system maximum loadability computation approach and vortex searching algorithm

10.11591/ijape.v8.i2.pp186-208
Y. Latreche , H. R. E. H. Bouchekara , M. S. Javaid , M. M. Aman , H. Mokhlis , F. Kerrour
In this paper, the optimal incorporation of distributed generation (OIDG) units for the maximization of the system‟s loadability is investigated (based on sizing and siting). To this end a new computational approach for computing maximum loadability of the system is developed. This approach has been compared with the classical one on different radial test systems (RTS) and is found to be faster and more accurate. The OIDG problem is formulated mathematically as an optimization problem with the objective function to maximize system‟s loadability, the imposed constraints are; voltage limits, thermal limits and DG penetration level. The optimization algorithm used is to solve the OIDG problem is the Vortex searching algorithm (VS). The tested radial distribution systems are the standard 33-bus and 69-bus systems. This paper also discusses some other interesting findings about VS algorithm.
Volume: 8
Issue: 2
Page: 186-208
Publish at: 2019-08-01

Modeling and predictive control of InGap/GaAs/Ge triple-junction solar cells to increase the energy conversion efficiency

10.11591/ijape.v8.i2.pp120-128
Reza Barati-Boldaji , Sepide Mojalal , Mohammad Reza Seifi
Physical studies of the last decade indicate that multi-junction solar cell has higher energy conversion efficiency than single-junction cells. However, choosing the type of material, modeling and finding the parameters of this type of cell has always been one of the leading challenges in this topic. Most of the proposed models are assumed to have predetermined electrical parameters of the cell or regardless of the effect of the tunnel junction, which reduces of the system. This paper discusses the modeling of solar cell triplejunction InGap/GaAs /Ge, taking into account the effect of a tunnel junction and finds the parameters of each subcellular deal. Also, predictive control will be used to control the active and reactive power of the single-phase inverter. The use of this method eliminates the need for the modulation module and the phase-lock loop (PLL). And simplifies the control algorithm for its digital implementation. The proposed cost function of this paper will be such that in addition to controlling the power of the inverter, the closed loop stability will be guaranteed based on the Lyapunov theory. Finally, the performance of the system using the software MATLAB/SIMULINK simulation will be evaluated.
Volume: 8
Issue: 2
Page: 120-128
Publish at: 2019-08-01

Machine vision based smart parking system using Internet of Things

10.12928/telkomnika.v17i4.12772
Daniel Ng Chiu; Universiti Teknologi Malaysia Loong , Suhaila; Universiti Teknologi Malaysia Isaak , Yusmeeraz; Universiti Teknologi Malaysia Yusof
It is expected that in the next decade, majority of world population will be living in cities. Better public services and infrastructures in the city are needed to cope with the booming population. City vehicles that cruising for parking have indirectly causing traffic, making one harder to travel around the city. Thus, a smart parking system can certainly lays the foundation to build a smart city. This paper proposed a cost-effective IoT smart parking system to monitor city parking space and provide real-time parking information to drivers. Moreover, instead of the conventional approach that uses embedded sensors to detect vehicles in the parking area, camera image and machine vision technology are used to obtain the parking status. In the prototype, twenty outdoor parking lots are covered using a 5 megapixel camera connected to Raspberry Pi 3 installed at the 5th floor of the nearby building. Machine vision in this project that involved motion tracking and Canny edge detection are programmed in Python 2 using OpenCV technology. Corresponding data is uploaded to an IoT platform called Ubidots for possible monitoring activity. An Android mobile application is designed for user to download real-time data of parking information. This paper introduces a low cost smart parking system with the overall detection accuracy of 96.40%. Also, the mobile application allows users to alert other car owners for any emergency incidents and double parking blockage. The developed system can provide a platform for users to search for empty car parking with ease and reduce the traffic issues such as illegal double parking especially in the urban area.
Volume: 17
Issue: 4
Page: 2098-2106
Publish at: 2019-08-01

Implementation of optimal solution for network lifetime and energy consumption metrics using improved energy efficient LEACH protocol in MANET

10.12928/telkomnika.v17i4.12004
Prasad; Rajarajeshwari College of Engineering A. Y. , R.; Rajarajeshwari College of Engineering Balakrishna
In current scenarios MANET mainly focus on low power battery operated devices. Moreover in a MANET transmission of large data consumes more energy that affects the performance of network, energy consumption, throughput, end to end delay, and packet overhead. The sum of these parameter metrics measure must be taken into account to increase the life-time and network energy efficiency. The main constraint in WSN is due to the restricted power in a node, which cannot be substituted. The node senses the data and it is moved towards the sink. This action of data movement needs to be efficient and the usage of battery in the sensor node requires to be efficiently employed to improve the network lifetime. The development of the energy efficient algorithms is of primary concern in the research arena of MANET. In any network, most of the routing protocols are focused directly to collect and bifurcate the large data for long distance communication. The prime goal of this research focused to identifies and survey more suitable routing protocol for MANET. That consumed less energy and increase life time of network. In this paper the author made on attempt on improved energy efficient LEACH protocol for MANET to reduce the energy dissipation that to life time of the network during the data transmission between source nodes and destination nodes.
Volume: 17
Issue: 4
Page: 1758-1766
Publish at: 2019-08-01

Intelligent home automated system

10.11591/ijeecs.v15.i2.pp733-742
R MF Amin , R FA Yasmin , A. N. Azlina , AB Zanariah , Y Faridah
Home automation system is one of the intelligent systems meant to create new opportunities for industry and business, as well as new experiences for users and consumers. This project is about designing, developing and testing a web-based intelligent home automation system called i-Home. The main users will be residents in any residential area i.e. gated community, terrace housing area, condominium and others. Its function is to ease residents in controlling the lights, fans, air conditioning, the house temperature and monitoring their CCTVs through online. For the hardware component Raspberry Pi was used due to its low cost, credit card-sized single-board computer that includes a processor, GPU, RAM and MicroSD as the server. Raspberry Pi primarily uses Linux-kernel-based operating system. It also requires PHP, JavaScript, Python and MySQL. The prototype of the system was built and performed most of the functions of home automation system. Usability and functional testing were carried out and both results showed that all functions worked perfectly.
Volume: 15
Issue: 2
Page: 733-742
Publish at: 2019-08-01

Detection air pollution based on infrared image processing

10.12928/telkomnika.v17i4.12824
Sri Ratna; University of Lampung Sulistiyanti , F. X. Arinto; University of Lampung Setyawan , Muhamad; University of Lampung Komarudin
This paper proposes a method of detecting air pollution in a region using image processing techniques. The image used is the infrared image that obtained using a modified digital camera by mounting the SRS filter. Image processing technique used is to utilize wavelet transformation. Pollutants are detected based on the average number of white pixels that appear on the image. This white pixel appears due to the reflection of the wavelength of the pollutant that hits the sensor on the camera. From the results of the proposed method detection is known that the highest pollution occurs in 12.00 which is the busiest traffic time and the lowest pollution occurred in 08.00 where the traffic passing through the area has not been crowded.
Volume: 17
Issue: 4
Page: 1796-1802
Publish at: 2019-08-01

Seller reputation impact on sales performance in public e-marketplace Bukalapak

10.12928/telkomnika.v17i4.11780
M. Ammar; Institut Teknologi Sepuluh Nopember Fauzan , Amna Shifia; Institut Teknologi Sepuluh Nopember Nisafani , Arif; Institut Teknologi Sepuluh Nopember Wibisono
Seller reputation system (SRS) is an online facility in the public e-marketplace to assess how trustworthy a seller is. SRS becomes important for customers to increase transactional confidence and help customers avoiding untrustworthy sellers. Previous research indicates that different countries with different cultures will lead to different results on how seller reputation influence sales performance. This study aims to investigate the impact of seller reputation on the number of sales in the context of the Indonesian market. This research uses Bukalapak as the case study, which the majority of its customers are Indonesian. Further, this study employ multiple regression analysis on smartphone sales data. The result shows that in Indonesian online market context, the number of seller’s followers does not affect sales number. Furthermore, price and seller positive reviews have a significant impact on sales performance. This study provides insight for sellers in the Indonesian marketplace on how to improve sales performance based on seller reputation.
Volume: 17
Issue: 4
Page: 1810-1817
Publish at: 2019-08-01

Performance enhancement of maximum power point tracking for grid-connected photovoltaic system under various gradient of irradiance changes

10.12928/telkomnika.v17i4.10335
Mario Norman; SMK N 1 Blado Syah , Subiyanto; Universitas Negeri Semarang Subiyanto
This paper presents a new variant of smart adaptive algorithm of Maximum Power Point Tracking (MPPT) in the photovoltaic (PV) system. The algorithm was adopted from Modified Perturb and Observe (MP&O). The smart adaptive MPPT is used to search Maximum Power Point (MPP) of the PV system under various irradiance changes. This algorithm incorporates information of current change (ΔI), maximum operating point margin and dynamic perturbation step to prevent MPPT diverging away from the MPP and minimize the steady state oscillation. The smart adaptive MPPT algorithm performance is compared with the dI-P&O and conventional P&O to prove its effectiveness. The comparison is performed under the various gradient of irradiance change. It was found that, for all the tests, the smart adaptive algorithm scheme improve the tracking efficiency under various gradients of irradiance changes and increase the efficiency of extraction power from PV system.
Volume: 17
Issue: 4
Page: 1973-1984
Publish at: 2019-08-01

Hybrid fuzzy-sliding grasp control for underactuated robotic hand

10.12928/telkomnika.v17i4.12678
Fredy; Universidad Distrital Francisco José de Caldas Martinez , Holman; Universidad Distrital Francisco José de Caldas Montiel , Edwar; Universidad Distrital Francisco José de Caldas Jacinto
A major part of the success of human-robots integration requires the development of robotic platforms capable of interacting in human environments. Human beings have an environment designed for their physical and morphological capacity, robots must adapt to these conditions. This paper presents a fuzzy-sliding hybrid grasp control for a five-finger robotic hand. As a design principle, the scheme takes into account the minimum force required on the object to prevent the object from slipping. The robotic hand uses force sensors on each finger to determine the grasp state. The control is designed with two control surfaces, one when there is slippage, the other when there is no slippage. For each surface, control rules are defined and unified by means of a fuzzy inference block. The proposed scheme is evaluated in the laboratory for different objects, which include spherical and cylindrical elements. In all cases, an excellent grasp was observed without producing deformations in the fragile objects.
Volume: 17
Issue: 4
Page: 2070-2075
Publish at: 2019-08-01

Regional gradient optimal control problem governed by a distributed bilinear systems

10.12928/telkomnika.v17i4.11275
Maawiya Ould; Jouf University Sidi , Sid Ahmed; Jouf University Beinane
This paper gives an extension of previous work on gradient optimal control of distributed parabolic systems to the case of distributed bilinear systems which are a type of nonlinear systems. We introduce the notion of flux optimal control of distributed bilinear systems. The idea is trying to achieve a neighborhood of the gradient state of the considered system by minimizing a nonlinear quadratic cost. Using optimization techniques, a method showing how to reach a desired flux at a final time, only on internal subregion of the system domain will be proposed. The proposed simulation illustrates the theoretical approach by commanding the heat bilinear equation flux to a desired profile.
Volume: 17
Issue: 4
Page: 1957-1965
Publish at: 2019-08-01

Space charges analysis on insulator with uniform layer contamination effect

10.12928/telkomnika.v17i4.12765
Mohd Haris Asyraf Shee; Universiti Tun Hussein Onn Malaysia (UTHM) Kandar , Nor Akmal Mohd; Universiti Tun Hussein Onn Malaysia (UTHM) Jamail , Qamarul Ezani; Universiti Tun Hussein Onn Malaysia (UTHM) Kamarudin , Nordiana Azlin; Universiti Tun Hussein Onn Malaysia (UTHM) Othman , Nor Asiah; Universiti Sains Malaysia Muhamad
High voltage direct current (HVDC) transmission provides an attractive alternative for bulk power transfer. However, HVDC transmission may have loss about half per unit length of high voltage alternating current (HVAC) at the same amount of power carried. This is due to the space charge formation around the conductor in HVDC cables. It is known that the presence of space charge inside an insulator may distort the local electric field and surface energy. This paper investigates the effect of electrostatics for space charge, electric field and surface energy in the HVDC cable in clean and contaminated conditions. The effect of uniform layer contamination from oil, sandstone and fresh water was conducted on 11 kV XLPE cable using finite element software under electrostatics study. The contamination layer was created around the XLPE cable by multifarious the radius of layer contamination from the conductor. The simulation results show that enlargement of contamination layer radius by 1.0 mm (light), 1.5 mm (medium) and 2.0 mm (heavy) resulted in the reduction of surface energy by 20% and electric field by 22% but increase the space charge amplitude by 76%. The study also found that fresh water can be considered as the worst contamination compared to oil and sandstone.
Volume: 17
Issue: 4
Page: 2001-2007
Publish at: 2019-08-01

An obstacle aware mobile sink path strategy in WSN

10.11591/ijeecs.v15.i2.pp879-887
T. H. Feiroz Khan , D. Siva Kumar
In Wireless Sensor Networks, Mobile Sink accomplishes considerable achievement on network lifetime improvement. In sensing environment, more chances to present the obstacle. But, in the mobile sink, how to identify the obstacle and make the obstacle aware path strategy is a challenging task. To overcome this problem, we propose an Obstacle Aware Mobile sink Path Strategy (OAMPS) that detects any obstacles which enter within the network lifetime and design a shortest mobile sink movement path avoiding detected obstacles. In this scheme, the mobile sink collects the sensing data from the super node then it sends the data to the base station. Here, static or moving obstacles are present when the mobile sink moves the path scheduling by spanning graph. This algorithm is introduced to discovering the obstacle avoiding shortest path. The source selects the route by the updated cuckoo search algorithm. The simulation results show that the OAMPS improved the throughput and minimized the delay in the network.
Volume: 15
Issue: 2
Page: 879-887
Publish at: 2019-08-01

A 5G graphene antenna produced by screen printing method

10.11591/ijeecs.v15.i2.pp950-955
Siti Nor Hafizah Sa’don , Mohd Haizal Jamaluddin , Muhammad Ramlee Kamarudin , Fauzan Ahmad , Samsul Haimi Dahlan
The save and fast manufacturing are required in order to achieve 5G technology. However, there are many kinds of manufacturing antenna which are depending on material applied in the antenna itself. Each type of manufacturing also has its own advantages and drawback. In this article, a graphene antenna for 5G applications is manufactured using screen printing method. A fine mesh resolution of 120 µm is used to print the antenna accurately. This kind of printing has capability to produce antenna in less than 5 minutes. The antenna made by conductive graphene ink has size of 11.8 x 12.2 x 0.076 mm3 and produced within a small amount of graphene ink. The measured antenna resonates at 15.04 GHz with reflection coefficient magnitude of -12.05 dB and percentage of impedance bandwidth is 30 % which is in the range of 13.3 to 18.0 GHz. The radiation pattern at E-plane and H-plane of the graphene antenna are simulated and measured where the result obtained are comparable.
Volume: 15
Issue: 2
Page: 950-955
Publish at: 2019-08-01

Plasma generator: design of six stage cockcroft-walton voltage multiplier 12 kV for impulse voltage generation

10.12928/telkomnika.v17i4.11828
Wijono; Brawijaya University Wijono , Eka; Brawijaya University Maulana , Dony Darmawan; National Sun Yat-sen University Putra , Waru; Brawijaya University Djuriatno
Cockcroft-Walton (CW) voltage multiplier is a voltage booster circuit with an array of series-connected only diodes and capacitors. In this research, voltage multiplier is designed to generate voltage up to 12 kV that the modified 6-stage constructed generator. It is designed as circuit charger of storage capacitor (CS) to generate combination wave impulse application which following standard those set in IEC (International Electrotecnical Commission) 61000-4-5 class 4. CS should be charged up to 4 kV according this standard. High impulse voltage and current works repeatedly in a short time, so the charging system is expected to reach targeted voltage within a maximum time of 10 seconds. Besides charging is also required to design of circuit discharger for discharging electric charge inside the CS. It is expected to reach 0 kV within a maximum time of 15 seconds with overdamped technique. There are three results of the research projects such as output voltage of CW voltage multiplier before connecting CS, charging time of CS, and discharging time of CS. The result showed that CW voltage multiplier can generate up to 12.01 kV on simulation and 11.9 kV on experiment. CS can be charged up to 4 kV in 9.8 seconds on simulation and 7.9 seconds on experiment. CS can be discharged in 14.2 seconds on simulation and 10 seconds on experiment. These results are in accordance with the expectation.
Volume: 17
Issue: 4
Page: 1890-1897
Publish at: 2019-08-01
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