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31,456 Article Results

Utilization of the finite element method for the calculation and examination of underground power cable ampacity

10.11591/ijape.v8.i3.pp257-264
Mahmood Khalid Hadi
Currently, the use of underground electric cables is a regular feature of present-day power transmission and distribution schemes. Issues related to economical limitations and the lack of adequate space led to the need for cables with an elevated current carrying capacity (ampacity). In order to achieve this objective, public services around the globe are focusing not only on better designs, but also on improving the level of precision in the context of cable parameter values. Precise parameter values are essential for ensuring that the replicated outcomes correspond sufficiently close to actual circumstances. While the conventional approach to ampacity calculation is through the IEC-60287 procedure, the numerical route is considered more specific and flexible. This endeavour harnesses the finite element method to conceive an innovative process for calculating the thermal field and ampacity of a cable. This process involves the crafting of a temperature field distribution model for scrutinizing temperature distribution in the region of an electric cable, and the deployment of the linear interpolation procedure for computing its ampacity. Subsequent to its formation, the model was put into operation on the underground cable 33KV XLPE.
Volume: 8
Issue: 3
Page: 257-264
Publish at: 2019-12-01

Speed control of DC motor using conventional and adaptive PID controllers

10.11591/ijeecs.v16.i3.pp1221-1228
Sarah N. Al-Bargothi , Ghazi M. Qaryouti , Qazem M. Jaber
Proportional Integral Derivative (PID) controllers are extensively used in practical industries to control the speed of DC Motors. The single weakness of PID controllers is their sensitivity to variation in parameters and operating conditions; thus, tuning the controller gains to adapt with these variations presents a practical challenge. In this paper, an adaptive mechanism that utilizes a Recursive Least Square (RLS) algorithm, with rate limiters, is implemented to perform an online self-adjusting of each of the PID gains in order to achieve Adaptive PID (APID) controller that will accommodate to system variations. MATLAB/ Simulink software is used to implement and simulate APID control of a Chopper-Fed DC motor. A conventional PID control system is also designed and simulated to obtain results that can be used to judge the performance of the APID controller. Results proved that the APID controller forced the motor speed to track the reference input with insignificant tracking error, and also managed to attain the motor speed at its desired value, regardless of the load changes inflected on the motor. This enhances both transient and steady-state speed responses.
Volume: 16
Issue: 3
Page: 1221-1228
Publish at: 2019-12-01

Performance evaluation of roof top solar photovoltaic systems in Tamilnadu

10.11591/ijape.v8.i3.pp265-276
M. Aravindan , V. Balaji , V. Saravanan , M. Arumugam
This manuscript reports the monitored performance results of roof top solar photovoltaic (PV) power plants in different parts of Tamilnadu, India. In this work, PV plants of capacities 84 kWp and 18 kWp located at Tirunelveli and Ranipet respectively in Tamilnadu are considered. During an eight month period, of September 2014 to April 2015, these plants had generated 43.99 MWh and 15.55 MWh units of electricity respectively. The average electricity production per day for the considered period of these plants is 181.74 kWh and 62.81 kWh respectively. The performance ratio (PR) of these plants PV1 and PV2 is found to be 0.52 and 0.86 respectively. The characteristics of poly crystalline PV modules and the performance of employed photovoltaic inverters are also analyzed.It is observed that external conditions like climate and bad weather significantly reduces the PV system output, whereas it reduces marginally due to inverter failure as observed from the values of energy yield and performance ratio of these plants. Online monitoring of PV plant with DC/AC line and phase voltages and current waveforms observed for the given day are also presented.
Volume: 8
Issue: 3
Page: 265-276
Publish at: 2019-12-01

A review of cloud oriented mobile learning platform and frameworks

10.11591/ijece.v9i6.pp5529-5536
Ahmad Shukri Bin Moh Noor , Marwan Nasser Yousef Atoom , Rabiei Mamat
With the continued growth of mobile devices usage, wireless communications improvement, and cloud computing evolution, many educational institutions around the world, especially universities and colleges, began to provide their students with mobile learning systems based on cloud computing. The widespread, ubiquitous, and flexible natures of mobile devices make mobile learning an attractive alternative in education, particularly when integrating it with cloud computing which is the up-to-date technology that delivers computing hardware and software as services. However, the participatory between mobile learning and cloud computing as a cloud based mobile learning (CBML) becomes one of the important methods in the learning process. Many researches have attempted to combine the unique features of CBML in a form of frameworks. These frameworks have been designed to identify, categorize, or evaluate the major components of the CBML system. This paper is an attempt to identify the important role of cloud computing technology in mobile learning, investigate the main advantages and limitations of CBML systems, and explore the previously designed CBML frameworks.
Volume: 9
Issue: 6
Page: 5529-5536
Publish at: 2019-12-01

New studies on network frequency responses considering dynamic loads

10.11591/ijape.v8.i3.pp209-220
L. T. M. Trang , H. Nouri
The dynamic model construction of transmission network components that include generator buses, load buses and power branches, within MATLABSimulink environment is presented. The degree of frequency deviation of buses when the power of motor loads and static loads vary, is studied. Furthermore, the influence of motor loads with different inertia constants are considered in the control technique of load frequency using a PID controller. The results show that the frequency oscillation of the dynamic load is greater than the frequency oscillation of static load. Also the speed of frequency control of the dynamic load is greater than the speed of the frequency control of the static load and the inertia constants of the dynamic load has significant influence on the frequency control characteristics.
Volume: 8
Issue: 3
Page: 209-220
Publish at: 2019-12-01

Neutral point clamped quasi Z source inverter for photovoltaic systems

10.11591/ijape.v8.i3.pp277-286
M. Aravindan , V. Balaji , V. Saravanan , M. Arumugam
Multilevel inverters are becoming popular for power conversion in renewable energy systems, AC-DC hybrid micro grids etc. The voltage stress and inrush current through these inverter leg switches are quite higher as compared to the load ratings which increase the chances of inverter leg switch failure. A three level neutral point clamped quasi Z source inverter topology is discussed in this paper which has the features of lower component count, reduced capacitor voltage stress, and it can be operated at different control strategies to achieve wide range of voltage boosting ability, suited for photovoltaic (PV) systems. It also ensures continuous input current irrespective of the DC supply voltage variations and injects stable and smooth power to the load/grid. The effectiveness of the proposed inverter is verified by simulation results in MATLAB Simulink model as well as performing experiment with the help of a laboratory prototype.
Volume: 8
Issue: 3
Page: 277-286
Publish at: 2019-12-01

Investigation of indoor propagation of WLAN signals

10.11591/ijeecs.v16.i3.pp1356-1363
Mohammed Sameer Salim , khalil Hassan Sayidmarie , Abdullah Hassan Aboud
The propagation of radio waves inside a typical university building is investigated by simulation and measurements. The Line of sight (LOS) and Obstructed Line of sight (OLOS) propagation scenarios were considered. The received power from a WLAN access point operating at 2.45GHz was determined from the simulations and measurements at various positions, orientations, and heights of the Tx and Rx antennas. The path loss exponents were estimated from the obtained simulation and measurement results of the received power variation with distance. The obtained path loss exponent values were found between 1.15-1.63 for LOS propagation and 2.14-2.55 for OLOS.
Volume: 16
Issue: 3
Page: 1356-1363
Publish at: 2019-12-01

Supervisory control of operation of a cogeneration plant using fuzzy logic

10.11591/ijape.v8.i3.pp234-248
Vivek Pandurangan , Om P. Malik
A fuzzy logic based supervisory controller for the multivariable control problem in the operation of a cogeneration plant is proposed. Results of simulation studies with the proposed controller on a dynamic model of the cogeneration plant show that the plant performs to expectations and tracks the set-points in an optimal manner while maintaining critical plant parameters within limits.
Volume: 8
Issue: 3
Page: 234-248
Publish at: 2019-12-01

A novel matlab/simulink model of DFIG drive using NSMC method with NSVM strategy

10.11591/ijape.v8.i3.pp221-233
Habib Benbouhenni , Zinelaabidine Boudjema , Abdelkader Belaidi
In this article, we present a comparative study between pulse width modulation (PWM) and neural space vector modulation (NSVM) strategy associated with a neuro-sliding mode control (NSMC) of stator reactive and stator active power command of a doubly fed induction generator (DFIG). The obtained results showed that, the proposed NSMC with NSVM strategy have rotor current with low harmonic distortion and low powers ripples than PWM strategy.
Volume: 8
Issue: 3
Page: 221-233
Publish at: 2019-12-01

Standalone hybrid power system using homer software optimal case sizing of ferraguig (North West of Algeria)

10.11591/ijape.v8.i3.pp287-298
B. Afif , B. Merabet , A. Benhamou , A. Chaker
Rural areas suffer from high costs of grid extensions obliging institutions to provide for other remedies for consumers, like using generators (GE) diesel often considered as economic and reliable solutions, but at the detriment of some order environment pollution and users convenience. Furthermore, the continuous decline in GEs prices based on a renewable energy (RE) and the increasing reliability of these systems have lead to a greater use of renewable energy sources for power generation in remote areas. A property which limits the use of renewable energy is related to the variability of resources. Fluctuations in load according to annual or daily periods are not necessarily correlated to the resources. In remote areas, the preferred option is the coupling between multiple sources, such as wind turbines and solar panels, this coupling is called hybrid power system. Algeria’s geographic location presents several advantages for the development and use of renewable energy, namely, solar energy and wind energy. In addition, Algeria has huge deposits of natural gas, 98% electricity comes from gas. Therefore, currently, the production of electricity from renewable energies primarily depends on their competitiveness with economic gas. Studied technological feasibility and economic viability of the hybrid system (PV/fuel) electrification project in a school located in Ferraguig succeed to reduce high costs, energy dependence, fuel supply problem, complicated/expensive maintenance, low lifetime, impossibility of 24 hours electricity production and waste oil management issues, by using renewable energy. HOMER model is used here to size a proposed system and determine an optimum configuration.
Volume: 8
Issue: 3
Page: 287-298
Publish at: 2019-12-01

Intelligent credit scoring system using knowledge management

10.11591/ijai.v8.i4.pp391-398
Bazzi Mehdi , Chamlal Hasna , El Kharroubi Ahmed , Ouaderhman Tayeb
Promoting entrepreneurship among Moroccan young people has been challenged by a plethora of economic and social problems in the aftermath of the Arab Spring. Several government programs have been set up for young entrepreneurs. Thus, faced with the large number of credit applications solicited by these young entrepreneurs, banks resorted to artificial intelligence techniques. In this respect, this article aims at proposing a decision-making system enabling the bank to automate its credit granting process. It is a tool that allows the bank, in the first instance, to select promising projects through a scoring approach adapted to this segment of entrepreneurs. In the second step, the tool allows the setting of the maximum credit amount to be allocated to the selected project. Finally, based on the knowledge of the bank’s experts, the tool proposes a breakdown of the amount granted by the bank into several products adapted to the needs of the entrepreneur.
Volume: 8
Issue: 4
Page: 391-398
Publish at: 2019-12-01

Integrated smart door system in apartment room based on internet

10.12928/telkomnika.v17i6.12322
Muchammad; Institut Teknologi Sepuluh Nopember Husni , Henning Titi; Institut Teknologi Sepuluh Nopember Ciptaningtyas , Ridho Rahman; Institut Teknologi Sepuluh Nopember Hariadi , Irzal Ahmad; Institut Teknologi Sepuluh Nopember Sabilla , Siska; Institut Teknologi Sepuluh Nopember Arifiani
Internet of Things (IoT) is technology which provides communication between machines without human intervention. There are many applications that implement IoT technology e.g. smart power, smart home, transportation management, and smart city. This paper proposes the usage of IoT to develop electronic key that can help to improve the security in apartment. Electronic key uses Android smart phone to access and control the door. Electronic key uses Raspberry pii, motor DC, webcam, microswitch, and Arduino GSM. Raspberry is used to get command from server and instruct the Arduino GSM to open or close the door and webcam is used to take picture from the environment for documentation. This research uses three steps to verify the user who want to open or close the door i.e. using username and password, bluetooth, and QR code scanner.
Volume: 17
Issue: 6
Page: 2747-2754
Publish at: 2019-12-01

Modified RSA-based algorithm: a double secure approach

10.12928/telkomnika.v17i6.13201
Israa; Baghdad College of Economic Sciences University Al_Barazanchi , Shihab A.; Directorate of Education Shawkat , Moayed H.; University of Imam Jaafar Alsadiq Hameed , Khalid Saeed; University of Samarra Lateef Al-badri
Security algorithms like RSA are becoming increasingly important for communications to provide companies, organizations, and users around the world, secure applications who rely heavily on them in their daily work. Security algorithms use different acquaintances among companies which might belong to various countries or even cities. Such data should essentially be encrypted to make sure that there is security in transportation. Thus, the current research paper leads to the novel system of security for the safe transfer of data. This paper examines the general principles of encryption and focuses on the development of RSA and the complexity of the encryption key so that it becomes more secure in the applications used. In this project, we will work on the RSA algorithm by adding some complexity to the 3keys (3k). This addition will increase the security and complexity of the algorithm's speed while maintaining encryption and decryption time. The paper also presents an approach by means of public key encryption to enhance cryptographic security. Moreover, double security is provided by the algorithm of RSA. This novel RSA algorithm was investigated in MATLAB. Numerical results for the various parameters such as Mean Square Error (MSE), correlation and Bit Error Ratio (BER) were implemented for the encryption of the message. The experimental results demonstrated that the proposed algorithm for 3 keys has small error rate in the retrieval of the encoded text.
Volume: 17
Issue: 6
Page: 2818-2825
Publish at: 2019-12-01

Performance analysis of CIC multirate filter in cognitive radio for efficient pulse shaping in wireless domain

10.11591/ijict.v8i3.pp184-190
A. S. Kang , Er.Vishal Sharma , Prof.Renu Vig
In this paper, the Performance Analysis of Cascade Integrator Comb Filter in context of Filter Bank Multicarrier Transmission has been presented for Cognitive radio. A benefit of the chosen technique is that, a CIC filter can be designed with a slight adjustment in parameters of interest. The entire performance of the filters designed is analyzed and evaluated by analyzing Normalized Amplitude versus Normalized Frequency plots at typical K and N values. The roll off factor plays a significant role in performance analysis of CIC filter. The results shown are a useful advance for rf design engineers working in the domain of multirate signal processing in wireless communication. To ensure the acceptable performance of Enhanced FBMC, computational complexity, and transmission burst length need to be reduced. The effect of Stop band attenuation on the edges of Magnitude and Frequency responses has been studied under constraints such as Lp, K and M during different simulation runs.
Volume: 8
Issue: 3
Page: 184-190
Publish at: 2019-12-01

A web/mobile decision support system to improve medical diagnosis using a combination of K-Mean and fuzzy logic

10.12928/telkomnika.v17i6.12715
Zainab T.; University of Baghdad Al-Ars , Abbass; University of Information Technology and Communications Baghdad Al-Bakry
This research provides a system that integrates the work of data mining and expert system for different tasks in the process of medical diagnosis, and provides detailed steps to the process of reaching a diagnosis based on the described symptoms and mapping them with existing diagnosis available on the web or on a cloud of medical knowledge based, aggregate these data in a fuzzy manner and produce a satisfactory diagnosis of the persisting problem. The mobile phone interface would make the system user-friendly and provides mobility and accessibility to the user, while posting updates and reading in details the steps that led to the decision or diagnosis that is reached by the K-mean and the fuzzy logic inference engine. The achieved results indicate a promising diagnosis performance of the system as it achieved 90% accuracy and 92.9% F-Score.
Volume: 17
Issue: 6
Page: 3145-3154
Publish at: 2019-12-01
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