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Microcontroller Based Electrical Parameter Monitoring System of Electronic Load Controller Used in Micro Hydro Power Plant
Issue:
Volume 3, Issue 5, October 2015
Pages:
97-109
Received:
23 July 2015
Accepted:
15 August 2015
Published:
27 August 2015
Abstract: In stand-alone micro-hydro power system, water turbine will vary in speed due to the variation of consumer load. This speed variation will cause in fluctuation in both voltage and frequency output from a generator. To solve this problem, electronic load controllers were invented and used in micro-hydro power system. The objective of this paper is to monitor the electrical parameters such as voltage, current, power and frequency of electronic load controller (ELC) by using microcontroller and liquid crystal display (LCD). It explains how to monitor and sense the above parameters and isolate between the power line and microcontroller. The voltage is sensed by using the step down transformer and voltage divider circuit. The current is measured with the help of an ACS 712 current sensor. Frequency signal is obtained by using a frequency signal converter circuit. Microcontroller 16F887 and liquid crystal display are used as the main devices to monitor the above parameters according to the values obtaining from the sensing circuits.
Abstract: In stand-alone micro-hydro power system, water turbine will vary in speed due to the variation of consumer load. This speed variation will cause in fluctuation in both voltage and frequency output from a generator. To solve this problem, electronic load controllers were invented and used in micro-hydro power system. The objective of this paper is t...
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Performance Analysis of DWDM System with Optical Amplifiers in Cascade Considering the Effect of Crosstalk
Abu Jahid,
Sanwar Hossain,
Raziqul Islam
Issue:
Volume 3, Issue 5, October 2015
Pages:
110-116
Received:
9 August 2015
Accepted:
17 August 2015
Published:
29 August 2015
Abstract: In this paper, an analytical approach is presented to evaluate the performance of DWDM system with intensity modulation direct detection (IM/DD) due to the effects of amplified spontaneous emission (ASE) noise of optical amplifier, optical receiver noises and crosstalk. And a system has been proposed with an optimum number of amplifiers with higher gain and an improved optical receiver has been proposed. We have investigated the effects of optical amplifiers and optical receiver in the presence of crosstalk on the overall performance; in particular, Signal-to-Noise Ratio (SNR) and Bit-Error-Rate (BER) performance of a DWDM system. The system performances are evaluated for varying different amplifier gains, number of optical amplifiers, hop length, number of hops, receiver bandwidth and receiver gain considering the relationship between crosstalk and the number of wavelengths channel spacing. It is found that, the performance is highly degraded due to crosstalk and noises. As a result the system suffers significant power penalty at a given BER.
Abstract: In this paper, an analytical approach is presented to evaluate the performance of DWDM system with intensity modulation direct detection (IM/DD) due to the effects of amplified spontaneous emission (ASE) noise of optical amplifier, optical receiver noises and crosstalk. And a system has been proposed with an optimum number of amplifiers with higher...
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Harmonic Aggregation Techniques
Mohammad Mahdi Share Pasand
Issue:
Volume 3, Issue 5, October 2015
Pages:
117-120
Received:
16 August 2015
Accepted:
29 August 2015
Published:
12 September 2015
Abstract: Different harmonic aggregation techniques for assessment of current harmonic levels at points of measurement are investigated and compared to each other. The interaction effect in aggregation of harmonic currents is investigated. Several approaches including IEC 61000-3-6 recommended method are utilized and compared.
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A Study and Design of a Rat-Race Coupler based Microwave Mixer
Issue:
Volume 3, Issue 5, October 2015
Pages:
121-126
Received:
12 September 2015
Accepted:
24 September 2015
Published:
10 October 2015
Abstract: A microwave mixer circuits has been designed and fabricated, having frequency range of 2 GHz- 4 GHz, with optimum operating point at 3 GHz. The underlying theory of rat-race coupler was used to achieve frequency up-conversion and down-conversion process with the help of a nonlinear element - Schottky diode. The simulation of both the rat-race coupler and the mixer circuit has been done with Agilent Advanced Design System (ADS) software, and the fabricated mixer circuit has been tested using Vector Spectrum Analyzer (VSA). The measured results of the mixer has shown perfect consistency with the simulated outputs.
Abstract: A microwave mixer circuits has been designed and fabricated, having frequency range of 2 GHz- 4 GHz, with optimum operating point at 3 GHz. The underlying theory of rat-race coupler was used to achieve frequency up-conversion and down-conversion process with the help of a nonlinear element - Schottky diode. The simulation of both the rat-race coupl...
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Unrepeatered OTDM Data Transmission over Long Legacy Fiber Span Using Unidirectional Backward Raman Amplification
Issue:
Volume 3, Issue 5, October 2015
Pages:
127-132
Received:
27 September 2015
Accepted:
11 October 2015
Published:
28 October 2015
Abstract: This paper presents experimental results for transmitting 40 Gb/s OTDM signal over in-line long fiber span using unidirectional backward Raman amplification. The investigation uses legacy dispersion-managed SMF-DCF configuration where remote Erbium amplification is used to compensate for the DCF spans losses. It is practically shown that the system performance improves significantly with more Raman pump power if we use an appropriate signal wavelength, Raman pump power and Erbium gain. As a result, successful unrepeatered transmission over 206 km SMF is achieved using 1545 nm signal wavelength, 1.58 W Raman power and unsaturated EDFA gains into the DCF spans. We believe that the results of such investigation can be useful for enhancing systems that still use legacy cables without the need for substantial alteration.
Abstract: This paper presents experimental results for transmitting 40 Gb/s OTDM signal over in-line long fiber span using unidirectional backward Raman amplification. The investigation uses legacy dispersion-managed SMF-DCF configuration where remote Erbium amplification is used to compensate for the DCF spans losses. It is practically shown that the system...
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Study on Transformer Fault Diagnosis Based on Dynamic Fault Tree
Fei Peng,
Lin Cheng,
Kaikai Gu,
Zhenbo Du,
Jiang Guo
Issue:
Volume 3, Issue 5, October 2015
Pages:
133-138
Received:
22 November 2015
Published:
24 November 2015
Abstract: In this paper, according to theoretical diagnosis of fault tree, the author builds a diagnosis model based on dynamic fault tree and illustrates the model’s construction method and diagnosis logic in detail. According to case analysis, compared with conventional fault tree diagnosis, the above-mentioned method is advanced in fault-tolerant ability. Plus, the diagnosis results record some intermediate processes of the diagnosis, with relevant information being returned to the researchers as ideas facilitating further analysis in the event of incomplete information.
Abstract: In this paper, according to theoretical diagnosis of fault tree, the author builds a diagnosis model based on dynamic fault tree and illustrates the model’s construction method and diagnosis logic in detail. According to case analysis, compared with conventional fault tree diagnosis, the above-mentioned method is advanced in fault-tolerant ability....
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Smart Inverter with Active Power Control and Reactive Power Compensation
Zaiming Fan,
Xiongwei Liu
Issue:
Volume 3, Issue 5, October 2015
Pages:
139-145
Received:
26 November 2015
Published:
26 November 2015
Abstract: Conventional grid-tied single phase inverters of renewable power generators (solar PV systems typical) have limited reactive power compensation capability and do not have active power control. This paper presents a novel control strategy which provides active power control with reactive power compensation for a DC/AC inverter connected to a single-phase AC grid, which supplies electricity to local loads. By sampling the instantaneous current on the grid at the local load side, which represents the domestic load current, an orthogonal signal is constructed using second order generalised integrator. The active and reactive current of the local loads are then rapidly detached from the orthogonal signal through specific trigonometric calculation. The reference current for the inverter output are produced by combining the active current and the reactive current which is detached from the domestic load current. Comparing the reference current with the inverter output current generates the PWM signals which are used to control the IGBT devices of the inverter bridge with capacitive impedance output to achieve domestic reactive compensation for inductive loads. The output current remarkably improves the load capacity of the grid and reduces the demand of reactive power from the gerid.
Abstract: Conventional grid-tied single phase inverters of renewable power generators (solar PV systems typical) have limited reactive power compensation capability and do not have active power control. This paper presents a novel control strategy which provides active power control with reactive power compensation for a DC/AC inverter connected to a single-...
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Designing Efficient Logistic System of Fresh Agricultural Products for Small Farms
Parung J.,
Santoso A.,
Prayogo D. N.,
Angelina M.,
Tayibnapis A. Z.,
Djoemadi F. R.
Issue:
Volume 3, Issue 5, October 2015
Pages:
146-149
Received:
30 November 2015
Published:
1 December 2015
Abstract: This research paper presents a framework of an efficient logistics system of fresh agricultural products for small farms. This paper illustrates efficient logistic system with a case study of apple products in East Java – Indonesia, in order to increase competitiveness against imported apples. The research focuses are small farms, farmer groups, middlemen, and distributors. Data are obtained from observations and interviews with the farmer’s groups which are representing small farms and distributors which are treated using process activity mapping (PAM), value stream mapping (VSM), and activity-based costing (ABC). Data analysis has identified value added and non-value added activities. Based on the analysis, this paper proposes an alternative efficient logistics system. However, this research has not been fully integrated due to insufficient data for designing holistic efficient logistics system for apples product by taking into account country and regional conditions.
Abstract: This research paper presents a framework of an efficient logistics system of fresh agricultural products for small farms. This paper illustrates efficient logistic system with a case study of apple products in East Java – Indonesia, in order to increase competitiveness against imported apples. The research focuses are small farms, farmer groups, mi...
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Numerical Calculations for Nonlinear Characteristics of Chaotic Systems
Ma Shangang,
Jin Fubao,
Liang Bin,
Tang Yan
Issue:
Volume 3, Issue 5, October 2015
Pages:
150-155
Received:
1 December 2015
Published:
1 December 2015
Abstract: This paper describes the relationship between Lyapunov index and the chaos of the dynamics system. Mainly describe the Lorenz system and Rossler system, and calculated the Lyapunov index of these two systems with nonlinear dynamics method. Analyses the iterative chaotic characteristic of Logistic system. And then calculate the Lyapunov index with the discrete system Lyapunov index computing method, and then calculated the correlation dimension.
Abstract: This paper describes the relationship between Lyapunov index and the chaos of the dynamics system. Mainly describe the Lorenz system and Rossler system, and calculated the Lyapunov index of these two systems with nonlinear dynamics method. Analyses the iterative chaotic characteristic of Logistic system. And then calculate the Lyapunov index with t...
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Challenges and Solutions for Autonomous Robotic Mobile Manipulation for Outdoor Sample Collection
Lei Cui,
Tele Tan,
Khac Duc Do,
Peter Teunissen
Issue:
Volume 3, Issue 5, October 2015
Pages:
156-164
Received:
3 December 2015
Published:
3 December 2015
Abstract: In refinery, petrochemical, and chemical plants, process technicians collect uncontaminated samples to be analyzed in the quality control laboratory all time and all weather. This traditionally manual operation not only exposes the process technicians to hazardous chemicals, but also imposes an economical burden on the management. The recent development in mobile manipulation provides an opportunity to fully automate the operation of sample collection. This paper reviewed the various challenges in sample collection in terms of navigation of the mobile platform and manipulation of the robotic arm from four aspects, namely mobile robot positioning/attitude using global navigation satellite system (GNSS), vision-based navigation and visual servoing, robotic manipulation, mobile robot path planning and control. This paper further proposed solutions to these challenges and pointed the main direction of development in mobile manipulation.
Abstract: In refinery, petrochemical, and chemical plants, process technicians collect uncontaminated samples to be analyzed in the quality control laboratory all time and all weather. This traditionally manual operation not only exposes the process technicians to hazardous chemicals, but also imposes an economical burden on the management. The recent develo...
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A CS and SFCW Based Reconstruction Algorithm for Through-the-Wall Radar Imaging
Sun Yanpeng,
Cui Zhao,
Qu Lele
Issue:
Volume 3, Issue 5, October 2015
Pages:
165-169
Received:
3 December 2015
Published:
3 December 2015
Abstract: To satisfy with the increasingly exacting demand for real-time and high resolution requirements of TWRI, a Compressive Sensing (CS) based TWRI algorithm is proposed after the exploitation of Stepped-Frequency-Continuous-Wave (SFCW) system and signal’s sparsity. Contrasted with the traditional imaging methods, this algorithm achieved precise targets localization and low sidelobe results with less computational time. The validity of the proposed CS imaging method is verified by simulation.
Abstract: To satisfy with the increasingly exacting demand for real-time and high resolution requirements of TWRI, a Compressive Sensing (CS) based TWRI algorithm is proposed after the exploitation of Stepped-Frequency-Continuous-Wave (SFCW) system and signal’s sparsity. Contrasted with the traditional imaging methods, this algorithm achieved precise targets...
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A Design of Active Power Filter for Superconducting Nanowire Single-Photon Detectors
Wang En-qiang,
Zhang La-bao,
Zhang Xiao-ying
Issue:
Volume 3, Issue 5, October 2015
Pages:
170-176
Received:
3 December 2015
Published:
3 December 2015
Abstract: The basic structure and working principles of superconducting nanowire single-photon detectors (SNSPD) are described in this paper. The special requirements for power quality of the system are introduced in this paper. Related experiments are designed to measure the power quality of the system. The paper designs a new type of single-phase active power filter(APF). By applying selective harmonic elimination technique(SHE), the APF can compensate the reactive component and high harmonics of line current without detecting the reactive current and harmonic current of the load. A switch angle’s solution method of optical SHEPWM is presented. PI controller of the APF is also designed. According to the data we got, the APF we designed can attain the goal of eliminating harmonics effectively.
Abstract: The basic structure and working principles of superconducting nanowire single-photon detectors (SNSPD) are described in this paper. The special requirements for power quality of the system are introduced in this paper. Related experiments are designed to measure the power quality of the system. The paper designs a new type of single-phase active po...
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Study on the Effectiveness Evaluation Method Based on the Combination of AHP and Grey Interval Correlation
Xu Shi-hong,
Zhao Wei-bin,
Huang Guo-qing
Issue:
Volume 3, Issue 5, October 2015
Pages:
177-180
Received:
6 December 2015
Published:
7 December 2015
Abstract: Aiming at the problem of using single judging value for the expert score of the traditional effectiveness evaluation, the expert's score data are not reliable; an improved effectiveness evaluation method based on the combination of AHP and grey interval correlation analysis is proposed. Interval number is used for the expert score in the improved method, the influence of the subjective fuzziness and objective fuzziness on the expert score using the single judging value is overcame. Interval number improved the reliability of the evaluation data. Combination weighting approach considering the influence of subjective and objective factors, the weight is more reasonable. The concrete steps of the improved effectiveness evaluation method are given. The improved method is proved to be more reasonable and reliable through an example.
Abstract: Aiming at the problem of using single judging value for the expert score of the traditional effectiveness evaluation, the expert's score data are not reliable; an improved effectiveness evaluation method based on the combination of AHP and grey interval correlation analysis is proposed. Interval number is used for the expert score in the improved m...
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