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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
Published by Institute of Advanced Engineering and Science
ISSN : 25024752     EISSN : 25024760     DOI : -
Core Subject :
Arjuna Subject : -
Articles 9,199 Documents
 141   142   143   144   145 
Study on Frequency Control Based on WTTP Frequency Detection Method Zhanfeng Ying; Yunyun Chen; Junji Wu
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 6: June 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

For improving the precision of power system frequency control under the condition of noise and harmonic interference, a new power system frequency control algorithm is proposed based on WTTP frequency detection method, which is a combination of wavelet transform and three-point frequency detection method. Fundamental component can be extracted from distorted signal by wavelet transform under asynchronous sampling, and then three-point frequency detection method is used to detect fundamental component frequency. For improving the detection precision, error mathematics mechanism of three-point frequency detection method is analyzed and error mitigation method is proposed. Even though there is noise and harmonic interference in feedback loop, power system frequency can be controlled accurately and stably by applying WTTP frequency detection method to power system frequency control. Simulation results demonstrate the feasibility of algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2665
Virtual inertia support for wind turbine system Nor Shahida Hasan; Norzanah Rosmin; Nor Julia Mohd Nordin; Aede Hatib Mustaamal; Siti Maherah Husin; Aripriharta Aripriharta; Ira Devi Sara
Indonesian Journal of Electrical Engineering and Computer Science Vol 17, No 2: February 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v17.i2.pp629-636

Abstract

Previously, a conventional synchronous generator is adapted into the wind energy conversion system to supply the required inertial support; however its slow behaviour may worsening the stability problem of the system during frequency event. In this paper, a new approach that enables virtual inertial support from supercapacitor during sudden load increase e.g. when wind turbine experiencing sudden wind or load changes is presented. Here, a new approach that can regulate the system frequency by controlling the charging and discharging process of supercapacitor is demonstrated. Hence, an algorithm on how to derive the behavior of supercapacitor and power converter is presented. From the simulation results, it has been found that this proposed approach successfully reduces the frequency nadir and ROCOF of the system frequency. It also able to avoid the second frequency dips during frequency recovery time.
Latin Hypercube Sampling with Evolutionary Algorithm for Static Security Risk Assessment Junfang Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 1: January 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Due to correlation coefficient matrix of initialized samples are not always positive definite, this paper presents the improved Latin Hypercube Sampling (LHS) methods with Evolutionary Algorithm (EA) to control correlation and handle power system probability analysis problem. To deal with the non-positive definite correlation matrix, an improved median Latin hypercube sampling with evolutionary algorithm (EA) called MLHS-EA into Monte Carlo simulation is proposed and investigated using IEEE 118-bus system with wind farms. This paper also discusses the misunderstandings about the non-positive definite correlation matrix and application of LHS in power system probabilistic analysis. With the proposed method in this paper, the correlation can be controlled more effectively than previous LHS methods. The accuracy of LHS for the static security assessment can also be improved further for solving the probabilistic analysis problem in power system. The effectiveness of the method is validated with the Matlab simulation results.DOI : http://dx.doi.org/10.11591/telkomnika.v12i1.2729
Switching Algorithm for Leakage Current Reduction in a PV- No Transformer Inverter System M. N. H. Khan; M. R. Hasan; M. K. Alam
Indonesian Journal of Electrical Engineering and Computer Science Vol 4, No 1: October 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v4.i1.pp52-56

Abstract

Electricity generation purposes renewable energy brings a important role especially Photovoltaic (PV) panels that can be covered our basic energy (electricity) needs. This photovoltaic panels cover a domestic level (solar power for home), commercially (solar power for commercial applications) or at the community level.  Here used this photovoltaic panel as an input of PV-transformer-less inverter topology which has been compared with existed H6 transformer-less inverter topology. It’s possible to reduce the leakage current with inclined the output voltage that has been shown here by using proposed topology.  This topology is made by using two extra switches with filter. Moreover, overall system actually verified with Pulse Width Modulation (PWM) switching technique.
Smart Monitoring and Controlling of Frequency Deviation by Using MATLAB GUI and ARDUINO DAQ Card Waqar Tariq; Mohammad Lutfi Othman; Noor Izzri Abdul Wahab; Shamim Akhtar
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 1: July 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v11.i1.pp224-232

Abstract

Electricity transmission and distribution in most of the countries are needed to be improved by the construction of new networks. These improvements are not that much cost effective and if cost is tried to be reduced then the quality and efficiency of the system is compromised which is not suitable at all for the current system. In addition obtaining planning permission and carrying out construction is so much difficult in busy cities. The main objective of this research is to monitor and control frequency deviation. A simple MATLAB controlling and monitoring system is being developed and the ARDUINO DAQ card is used to calculate the frequency deviation. The purpose of respective research is basically based on a dummy load which is used to show the usage of particular equipment’s used in a home such as fridge, freezer ,oven , lighting system, and domestic wet appliances such as washer dryer  which are attached these to a DAQ and then to a controlling and monitoring GUI MATLAB based. However, this research is focused on the monitoring and controlling of the frequency deviation.
Methodology for developing a web configurator for technology cabinets Shafik Shaehovich Khuzyatov; Lenar Ajratovich Galiullin
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 1: July 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i1.pp42-46

Abstract

Current trends in the development of Internet technologies are very promising, their role in the functioning of enterprises is increasing significantly. Internet technologies are tools that allow you to interact with potential customers and consumers, receive feedback from them. At the same time, factors of physical remoteness are practically nullified. The situation with the rapid development of the Internet market means that in the process of forming the necessary configurations of technological cabinets for industrial facilities management systems, the use of manual labor should be minimized. The standard approach uses paper media, which leads to a large investment of time in the formation of the necessary configurations and the calculation of their cost. In this regard, increases the complexity of the work performed and the likelihood of errors in the calculations. Thus, the following problems can be formed: the lack of sufficient mechanisms for operational interaction with potential customers; time consuming paper handling; the complexity of the operations; high probability of errors in the calculations; lack of operational access to the necessary information.
A Network Intrusion Detection Method Based on Improved ACBM Chen Shan; Diao Hong-Bin
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

In order to solve the problem which includes the difficulties of network intrusion detection, redundancy of network intrusion character, difficulties for feature matching, a network intrusion detection method based on improved ACBM algorithm is proposed in this article. The improved ACBM algorithm is used to achieve matching module, which add the filtering function for module improvement. The distribution characteristics of stability and the use of the bifurcated binary tree model is used to complete the feature classification. In the stable feature, the inter-class distance is used as the classification method of support vector machine, which has strong ability of generalization as well as high identification accuracy, and has the application foreground detection. Finally, the superiority of the proposed method is proved through the data in KDDCup99 database. It shows that the proposed network intrusion detection method by experiment, which combines the ACBM algorithm and the classification mechanism, has a better accuracy than LSSVM and SVM, and it is proved that  this method is very suitable for network intrusion detection under complex features environment. DOI : http://dx.doi.org/10.11591/telkomnika.v12i4.4246
Side Effects in a HEMT Performance with InAlN/GaN Z. Kourdi; B. Bouazza; A. Guen-Bouazza; M. Khaouani
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 2: August 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i2.pp249-258

Abstract

We present a simulation of a HEMT (high electron mobility transistor) structure. We extract the device characteristics through the analysis of DC, AC and high frequency regimes, as shown in this paper. This work demonstrates the optimal device with a gate length of 30 nm, and InAlN/GaN heterostructure for minimizing side effects. The simulated with Silvaco software of the HEMT devices with the materials InAlN show very good scalability in different application. We have demonstrated an excellent current density, as high as 644 mA/mm, a peak extrinsic transconductance of 710 mS/mm at VDS=2 V, and cutting frequency cutoffs of 385 GHZ, maximum frequency of 810 GHz, maximum efficiency of 23% for x-Band, maximum breakdown voltage of 365 V, and an ON/OFF current density ratio higher than 8 x 108. These values were determined through the simulation by hydrodynamics models, which makes that optimize the design is the future of this technology.
Application of Process Simulation Software METSIM in Metallurgy Zhao Qiuyue; Zhang Tingan; Lv Guozhi; Zhu Xiaofeng
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 8: December 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Now the using of process simulation software is more and more widely in many fields especially in chemistry and metallurgy plant designing. The process simulation software provides great convenience for experts and engineers, they can analysis the new process and calculate the heating/material balance by process simulation software, and calculate complex process that the traditional tool EXCEL can not do. The paper introduced the current major process simulation software, includes mainly introducing the application of METSIM and SYSCAD software in metallurgical process, and summary the computational process of them by a few examples, at the same time the application status of the process simulation software was pointed out. DOI: http://dx.doi.org/10.11591/telkomnika.v10i8.1660
Region of Interest Coding Based on Support Vector Machine in Transmission System Li Zhu; Xiaoguang Wu; Rong Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 10: October 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The development of network technology and multimedia technology has promoted the development of the integration, digitalization and individualization of communication technology, and has realized multiple functions based on wireless channel network, including voice, data and image. On the basis of classification by Support Vector Machine (SVM), this paper has proposed a low bit-rate coding method for segmenting the Regions of Interest (ROI) of objects through reasonably selecting initial class center and dynamically adjusting the number of categories, and designs its 3-dimension model method. In low bit-rate coding, the ROI is coded first using SPIHT algorithm, and then the background or the regions insensitive are coded using H.264 code, analyzing the experimental data and designing the structure, we can get the relation among related parameters under conditions of different permanent-magnet thickness and air gaps. It is proved that this method can achieve a better recognition effect, greatly improve the coding efficiency and satisfy the visual effects of human eyes, which can provide criteria in theory and application for designing on new driving principle, control system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3463 

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