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Bulletin of Electrical Engineering and Informatics
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Core Subject : Engineering,
Bulletin of Electrical Engineering and Informatics (Buletin Teknik Elektro dan Informatika) ISSN: 2089-3191, e-ISSN: 2302-9285 is open to submission from scholars and experts in the wide areas of electrical, electronics, instrumentation, control, telecommunication and computer engineering from the global world. The journal publishes original papers in the field of electrical, computer and informatics engineering.
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Articles 83 Documents
Stability in Time-Delay Systems: Quiet Standing Case Study Yakub, Fitri; Kojima, Akira; Mori, Yasuchika
Bulletin of Electrical Engineering and Informatics Vol 2, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

The analysis of linear time-delay systems has attracted much interest in the literature over last five decade. Two types of stability conditions, namely delay-independent which results guarantee stability for arbitrarily large delays and delay-dependent, results take into account the maximum delay that can be tolerated by the system and, thus, are more useful in applications. The stability in general for linear time-delay systems, can be checked exactly only by eigenvalue considerations. When reasonable chosen with intentional delays, case study effects on time-delay of ankle torque on the stability of quiet standing, it can be used to stabilize and improve the close-loop response of these systems.
Off-Grid Energy Technologies used in Rural Areas of India Arora, Krishan; Singh Virdi, Amardeep
Bulletin of Electrical Engineering and Informatics Vol 2, No 3: September 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

Energy scenario in India is changing with a greater pace. Growth rate of villages has increased, likewise their energy demand. With the awareness of the decreasing natural resources, non conventional energy resources are gaining lots of interest in sparsely separated areas. The rural areas of India are having the huge scarcity of energy because of limited energy resources and Grid connectivity is not feasible due to economic factors and geographical situations. So we require to establish the off grid system for the benefit of the mass. Off-grid System’s commissioning and operation done as indigenous unit, and free from grid related problems like frequency and voltage regulations and they provides flexible operation because their emphasis is on extraction of energy and conversion into useful work. This paper discusses the potential use of off-grid energy technologies as an alternative for grid extension. Off-grid Energy systems provide the solutions to the basic energy needs in the rural areas of India. These indigenously build plants are not connected to any electrical utility and can be connected with the micro grid for the better reliable operation. Due to small size their demand and load management would be easy. Off-grid system utilizes the solar thermal radiation, wind energy, geothermal energy, tidal wave, Biomass etc. There is numerous numbers of applications where we can use this energy and decrease the dependence on conventional grid.
Recent Trends in Power Transformer Fault Diagnosis and Condition Assessment Husain, Zakir; Malik, Hasmat; Khan, Mohd. Arif
Bulletin of Electrical Engineering and Informatics Vol 2, No 2: June 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

Power transformers are interface between different voltage levels of essential importance. Because of the long manufacturing processes, transformers are one of the most critical and expensive equipment and so this is one of the reasons why condition monitoring becomes more popular. Monitoring systems as basis for diagnostics open the possibility for expanding the operating time, reducing the risk of expensive failures and allows several maintenance strategies. With different monitoring techniques, detailed informations about the transformer condition can be received and helps to minimize the probability of an unexpected outage. In this paper a methodology has been developed to use information derived from condition monitoring and diagnostics for rehabilitation purposes of transformers. The interpretation and understanding of the test data are obtained from the International Standards.
Voltage Controlled Integrator and Linear Quadrature-VCO Using MMCC Venkateswaran, P.; Nandi, R.; Das, Sagarika
Bulletin of Electrical Engineering and Informatics Vol 2, No 2: June 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

A Voltage Controlled Oscillator (VCO) based on the new multiplication-mode current conveyor (MMCC) building block is presented. The oscillator is realized using a double integrator loop (DIL) where a linear frequency (fo) versus the control voltage (Vc) tuning characteristics with quadrature sinusoid signal generation in a range of 40  kHz ≤ fo≤ 700   kHz had been experimentally verified. The fo─ sensitivity is low while the frequency stability factor (Sf >>1) is high at satisfactory values of total harmonic distortion (THD ≈ 1.11%).
Power Quality Improvement Using Unified Power Quality Conditioner Based On Particle Swarm Optimization Saravanan, Ragavan; Manoharan, P.S.
Bulletin of Electrical Engineering and Informatics Vol 2, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

A unified power quality conditioner (UPQC)to compensate current and voltage power quality problems ofsensitive loads. The UPQC consists of a shunt and series inverter having a common dc link. The shunt inverter eliminates current harmonics originating from the nonlinear load side and the series inverter mitigates voltage sag/swell originating from the supply side. The developed controllers for shunt and series inverters are based on an enhanced phase-locked loop and nonlinear adaptive filter. The proposed UPQC achieves superior capacity of mitigating the effects of voltage sag/swell and suppressing the load current harmonics under distorted supply conditions.Particle swarm optimization is discussed for its character of simple computation and high measurement accuracy. Simulation results are shown to verify the effectiveness and superiority of thealgorithm.
Optimization of LPG Diffusion Flame Synthesis of CNT Structures using Statistical Design of Experiments (SDOE) Singh, Rabinder; Deep, Akash; Bharj, Jyoti; Arya, Nishtha
Bulletin of Electrical Engineering and Informatics Vol 1, No 4: December 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

A statistical designed experimental approach was followed to investigate the various diffusion flame conditions for the synthesis of carbon nanotubed structures utilizing domestic Liquefied petroleum gas (IS – 4576) as the fuel carbon source. LPG flow rate, Oxygen flow rate, Height above burner (HAB) and Exposure time have been identified to generate different flame conditions based on varying One factor at a time (OFAT) approach. Two–level ‘full factorial’ design model in “Minitab12” software has been used for design of experiments. The 16 samples of soot with different flame conditions were collected on the surface of stainless steel plate. The output parameters i.e. weight of soot and substrate surface temperature were analyzed by Analysis of variance (ANOVA) to ensure that the experimentation is following the physics of the diffusion flame.Transmission electron microscope (TEM) images showed the growth of well aligned single walled carbon nanotubed structures with high aspect ratio as 220nm – 650nm diameter and 534nm – 1803nm length. In the present studythe parametric range for producing the single walled carbon–nanotubed structures through LPG diffusion flame have been found for optimization.
A Novel Technique for Asymmetrical Fault A Novel Technique for Asymmetrical Fault Detection Dubey, Rahul
Bulletin of Electrical Engineering and Informatics Vol 1, No 4: December 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

This paper proposes a novel technique for asymmetrical fault detection (LLL-G) in DFIG based wind form using wavelet based energy function. In this study, there are six wind turbine driven DFIG are grouping together to make wind farm and 9 MW power is feeding to the grid. Further, the rotor is supplied by a bidirectional PWM converter for the control of active and reactive power flows from DFIG to the grid. In the case study, the three-phase fault is created in the grid and proposed algorithm detects the fault with in one and half cycles for 60 Hz system. A new diagnostic method based on the grid modulating signals pre-processing by Discrete Wavelet Transform (DWT) is here proposed to detect grid faults dynamically over time. Simulation results demonstrate the effectiveness of the proposed approach under time-varying conditions.
New Proxy Blind Multi Signature based on Integer-Factorization and Discrete-Logarithm Problems Verma, Swati; Kumar Sharma, Birendra
Bulletin of Electrical Engineering and Informatics Vol 1, No 3: September 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

Digital proxy multi-signature and blind signature scheme are found very useful for the purpose of electronic voting and electronic cash transaction. In proxy multi-signature, many original signers can delegate their signing power to a proxy signer in such a way that the proxy signer can sign any message on behalf of original signers. In blind signature, the signer cannot make a linkage between the blind signature and the identity of the requester. Proxy blind multi-signature is the combination of proxy multi-signature and blind signature. In this paper, we propose a new proxy blind multi-signature scheme based on integer factorization problem (IFP) and discrete logarithm problem (DLP) to improve the security aspect. It satisfies the security properties of both the blind signature and the proxy multi-signature scheme.
Simulation and Implementation of Soft-Switched Interleaved DC-DC Boost Converter for Fuel Cell Systems Seyezhai, R.; Harinee, Harinee; Nagarajan, Nagarajan
Bulletin of Electrical Engineering and Informatics Vol 1, No 3: September 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

In this paper, a soft-switched Interleaved DC-DC Boost Converter (IBC) for fuel cell is simulated and implemented. The proposed two-phase IBC circuit consists of two identical boost converter connected in parallel and are controlled by interleaved switching signals. But in the conventional IBC switching loss increases with the number of switching devices. To solve this problem, this paper has proposed a soft switched IBC. Detailed analysis has been done to investigate the benefits of soft-switched IBC compared to that of conventional uncoupled and directly coupled IBC. The converter circuit is constructed using power MOSFET as power switch. The PWM is generated by PIC18F4450 microcontroller. In this paper, the analysis of the converter is presented which is verified by the results of simulation and experimentation.
Minimum-Order Observers for hybrid Wind Turbine and Fuel cell Jaganathan, B.
Bulletin of Electrical Engineering and Informatics Vol 1, No 2: June 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

Renewable Energy Sources are the upcoming energy sources, for they are readily available. The performance of these sources depends upon the available input. A continuous monitoring of the output which is also dependent upon the state variables of the source model (state model) is necessary. It thus, necessitates the incorporation of an observer in the existing system which estimates the state variables continuously. This paper proposes a novel method of design at the design of a minimum order observer for a wind turbine, which further feeds a PMSG. This observer estimates the state variables of the wind turbine and compares this with the state variables of the actual plant model. This in turn generates a control vector which further provides the necessary control actions so that the output of the wind turbine is optimized to an acceptable extent. Three different configurations are made use for the simulation. The plant model with a PI controller in series with it, under open loop,the plant model in its closed loop form with negative feedback and finally the plant with the designed minimum order observer are simulated. It has been observed that the response of the overall system is improved with the implementation of the observer and so does the stability.Matlab/Simulink is used for validating the proposed idea.