Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

28,593 Article Results

Reliability Analysis of Surge Arrester Location Effect in High voltage substations

10.11591/ijeecs.v12.i8.pp5814-5826
Seyed Ahmad Hosseini , Mohammad Mirzaie , Taghi Barforoshi
High voltage substations as pivotal sections of power network play an important role in power network because of supplying electrical energy for consumers. In recent years with increment of electricity consumption and complexity of power system, the substation stability and protection against various faults or overvoltages has been a big concern. Surge arresters as protective device has the responsibility of attenuating overvoltage due to lightning or switching occurring in transmission or distribution system. Absence or failure of arresters inside or near substations can lead to load interruption and great outage in the system. Therefore their presence is indispensable. Demonstrating the surge arresters presence necessity and evaluating their failure impact during normal operating condition and overvoltage in different scenarios of arrester location and lightning surge position in view point of EMTP simulation and reliability technique is the purpose of this paper.
Volume: 12
Issue: 8
Page: 5814-5826
Publish at: 2014-08-01

Slip Enhancement in Continuously Variable Transmission by Using Adaptive Fuzzy Logic and LQR Controller

10.11591/ijeecs.v12.i8.pp6101-6110
Ma Shuyuan , Sameh Bdran , Saifullah Samo , Jie Huang
Enhancement of fuel consumption and transmission efficiency needs a continuous improved variator performance in continuously variable transmission (CVT). This paper focuses on the improvement of aslip controller for a hydraulically actuated metal push-belt continuously variable transmission (CVT), using model for variator dynamic in the CVT. The slip control purpose is to improve the performance of variator andto increase the efficiency of CVT by determination the line pressure which generates the clamping force. The selection of slip reference-point is taken at the transition region between the micro and macro slip region to guarantee the maximum variator efficiency. The adaptive fuzzy logic control (FLC) and Linear Quadratic Regulator (LQR) controllers are applied to control the clamping force. The proposed control systems are designed to ensure the existence of a slip values within the region, which has the traction coefficient maximum value, while the load disturbances caused by suddenly changed torques in the drive lines. These approaches have potential for the CVT efficiency improvement, as compared to PID controller. The adaptive fuzzy logic control technique uses a simple group of membership functions and rules to achieve the desired control requirements of slip in CVT. Simulation results show that satisfactory slip improvement is achieved together with good robustness against suddenly changed torques. It is further revealed that all adaptive fuzzy logic control and LQR controller have a valuable effect on minimizing the slip amount and maximize the variator efficiency.
Volume: 12
Issue: 8
Page: 6101-6110
Publish at: 2014-08-01

Effect of Maximum Voltage Angle on Three-Level Single Phase Transformerless Photovoltaic Inverter Performance

10.11591/ijeecs.v12.i8.pp5886-5896
M. Irwanto , M.R. Mamat , N. Gomesh , Y.M. Irwan
This paper presented a new topology of three-level single phase transformerless photovoltaic inverter (TPVI). It consisted of three main circuits; they were a pulse driver circuit, a full bridge inverter circuit and a power factor correction (PFC) circuit that had functions as production of pulse waves, to develop alternating current (AC) waveform and to stabilize voltage of photovoltaic (PV) array, respectively.  In this research, AC three-level waveform single phase TPVI was developed and created by a microcontroller PIC16F627A-I/P with varied maximum voltage angle from 200 to 1800 and observed on 28th February 2014 between  9.00  am to 17.00 pm, and also analyzed effect of maximum voltage angle on the three-level single phase TPVI performance.  The result showed that maximum voltage angles of the TPVI effected on root mean square value of AC voltage, current and power. If the maximum voltage angle was increased, therefore value of the AC voltage, current and power would increase. The maximum voltage angle would effect on the current total harmonic distortion (CTHD), the lowest CTHD of 15.448% was obtained when the maximum voltage angle was 1340
Volume: 12
Issue: 8
Page: 5886-5896
Publish at: 2014-08-01

Optimal Location of Wind Turbines in a Wind Farm using Genetic Algorithm

10.11591/ijeecs.v12.i8.pp5869-5876
C.Balakrishna Moorthy , M.K. Deshmukh , Darshana Mukherejee
In the present study, genetic algorithm has been used to resolve the placement of wind turbines in a wind park giving maximum power and efficiency with minimum number of turbines. Unlike past approaches where each plot was subdivided into smaller square grids at the centre of which a turbine can be placed, the present study does not require division of the plot. Thus, a turbine now has more flexibility to be placed anywhere outside a radius of 200m of each other yielding better results. The case of unidirectional uniform wind is considered and 600 individuals evolve 3000 generations. Along with the optimal layout, fitness value, total power output, efficiency and number of turbines have also been reported. Comparison with results of earlier study and possible explanation is also provided.
Volume: 12
Issue: 8
Page: 5869-5876
Publish at: 2014-08-01

A New Particle Filter Algorithm with Correlative Noises

10.11591/ijeecs.v12.i8.pp6164-6172
Qin Lu-Fang , Li Wei , Sun Tao , Li Jun , Cao Jie
The standard particle filter (SPF) requirements system noise and measurement noise must be independent. In order to overcome this limit, a new kind of correlative noise particle filter (CN-PF) algorithm is proposed. In this new algorithm, system state model with correlative noise is established, and the noise related proposal distribution function characteristics were analyzed in detail. At last, the concrete form of the best proposal distribution function is derived based on the condition of the minimum variance of importance weight with the assumption of gaussian noise. Theoretical analysis and experimental results show the effectiveness of the proposed new algorithm.
Volume: 12
Issue: 8
Page: 6164-6172
Publish at: 2014-08-01

Grid-connected Photovoltaic Power Systems and Power Quality Improvement Based on Active Power Filter

10.11591/ijeecs.v12.i8.pp5861-5868
Brahim Berbaoui , Samira Dib , Rachid Dehini
This paper presents a Parallel Active Power Filter (PAPF) using Photovoltaic cells Energy to feed linear or nonlinear loads with current perturbations compensation and the excess of the energy is injected into the mains. As a result of using instantaneous p-q theory as a control scheme, the multi-function operation such as harmonic elimination, reactive power control and uninterruptible power supply will be achieved. The system consisting of Photovoltaic cells, connected to a diode rectifier feeding a parallel active power filter is simulated in MATLAB/SIMULINK environment. The simulation results prove the efficiency of using the proposed method for Photovoltaic cells energy injection and power quality improvement in the grid power system.
Volume: 12
Issue: 8
Page: 5861-5868
Publish at: 2014-08-01

Case Study of line loss Reduction in TNEB Power Grid

10.11591/ijeecs.v12.i8.pp5847-5853
S. Sambath , P. Palanivel , C. Subramani , S.P.K. Babu , J. Arputhavijayaselvi
Unbundling of Electricity Boards in India into small units (corporations) have created opportunities for involvement of independent power generation companies. Remarkable achievements and improvements are expected in power quality especially in the southern part of the country where more power shortage, power quality low and serious power losses along the transmission and distribution lines of the power system. The power system utilities are increasing every day, to enhance the distribution power quality and maintain the voltage stability is a challenging task in the complex distribution. This can be achieved through the Distributed Generation (DG). DGs are the final link between the high voltage transmission and the consumers. This will effectively improve the active power loss reduction. This paper represents the technique to enhance the power qualities and minimize power losses in a distribution feeder by optimizing DG model in terms of size, location and operating point of DG. The proposed technique has been developed with considering load characteristics and representing constant current model. The effectiveness of the proposed technique is tested and verified using MATLAB software on long radial distribution system in Tamil Nadu (India).
Volume: 12
Issue: 8
Page: 5847-5853
Publish at: 2014-08-01

Observer-based state feedback H-infinity control for networked control systems

10.11591/ijeecs.v12.i8.pp6144-6152
Yanhui Li , Xiujie Zhou
The observer-based H-infinity controller design problem is considered for the networked control systems with uncertain network-induced delays and packet dropouts. The system states are reconstructed by introducing an observer and an augmented system model with time-varying delays is established. Based on the delay-dependent Lyapunov stability theory, a sufficient condition is proposed to ensure that the closed-loop system is asymptotically stable with a guaranteed H-infinity performance level r. Since the obtained condition is nonlinear, the singular value decomposition method is applied to convert the nonlinear inequalities into LMIs. The delay-dependent approach shows a less conservative result than the delay-independent approach. A numerical example is given to demonstrate the high validity and merit of the proposed approach.
Volume: 12
Issue: 8
Page: 6144-6152
Publish at: 2014-08-01

Application of Virtual Instrument LabVIEW in Variable Frequency and Speed Motor System

10.11591/ijeecs.v12.i8.pp6119-6126
Haizhen Guo , Junxiao Wu
The working process of the virtual instrument system: first the signal input signal system acquired by a sensor conditioning circuit, the signal conditioning circuit for amplifying, filtering, and then through the data acquisition card into the memory, then carries on the data analysis and processing of the collected data. This paper uses virtual instrument environment LabVIEW to the transmission, processing and graphic signal data acquisition system for motor experiment. The method proposed in this paper can analysis electrical parameters in different circumstances of variable frequency motor performance.
Volume: 12
Issue: 8
Page: 6119-6126
Publish at: 2014-08-01

Influence of Static VAR Compensator for Undervoltage Load Shedding to Avoid Voltage Instability

10.11591/ijape.v3.i2.pp124-129
Reshma Rajan , Venkateswara Rao , G. V. Nagesh Kumar
In the recent years, operation of power systems at lower stability margins has increased the importance of system protection methods that protect the system stability against various disturbances. Among these methods, the load shedding serves as an effective and last-resort tool to prevent system frequency/voltage instability. The analysis of recent blackouts suggests that voltage collapse and voltage-related problems are also important concerns in maintaining system stability. For this reason, voltage also needs to be taken into account in load shedding schemes. This paper considers both parameters in designing a load shedding scheme to determine the amount of load to be shed and its appropriate location .The amount of load to be shed from each bus is decided using the fixed step size method and it’s location has been identified by using voltage collapse proximity index method.  SVC is shunt connected FACTS device used to improve the voltage profile of the system. In this paper impact of SVC on load shedding for IEEE 14 bus system has been presented and analyzed.
Volume: 3
Issue: 2
Page: 124-129
Publish at: 2014-08-01

Pantograph Control Strategy Research Based On Fuzzy Theory

10.11591/ijeecs.v12.i8.pp6094-6100
Guan Jinfa , Zhong Yuan , Fang Yan
Dynamic interaction of pantograph and catenary is one of the most important factors affecting the safe and reliable operation of high-speed trains. In order to improve the quality of contact between pantograph and catenary, it is necessary to study the active control strategy of pantographs. In this dissertation, according to dynamic characteristics of pantograph and catenary, applying fuzzy control principle, the author designed a fuzzy controller of pantograph.Comparing with the situation without fuzzy control circuit, it is the result that standard deviation of contact force with a fuzzy control circuit is smaller than it without control, 39.5% off at 200km/h, 21.2% off at 300km/h, which indicate that using a pantograph with a fuzzy controller can improve the contact quality between pantograph and catenary effectively.
Volume: 12
Issue: 8
Page: 6094-6100
Publish at: 2014-08-01

Hybrid Generation Power System for Domestic Applications

10.11591/ijape.v3.i2.pp82-89
Qazi Waqar Ali , Muhammad Aamir , Arshad Nawaz , Zaki Udin , Shahid Ullah
This work presents the plan and model of the control strategy for the interconnection of the hybrid energy system able to regulating this load’s voltage and controlling the energy generation with the energy options. The control strategy contains controlling the energy generated through each energy source, in a hierarchical mode using sliding/dropping mode control, while consuming consideration elements that have an impact on each electrical power source and transform the energy generated in order to suitable circumstances for lower power and domestic programs. The cross alternative energy system consists of photovoltaic cellular material, fuel cellular material and battery packs. A numerical equation in order to estimate the perfect voltage involving photovoltaic systems for virtually every solar irradiance and temperature circumstances is suggested. Simulations of a single or a lot more systems interconnected towards the load with the entire proposed control scheme, under different ecological and weight conditions, usually are introduced to indicate this efficiency with the procedure.
Volume: 3
Issue: 2
Page: 82-89
Publish at: 2014-08-01

Capacity and Error Rate Analysis of MIMO Satellite Communication Systems in Fading Scenarios

https://ijece.iaescore.com/index.php/IJECE/article/view/5548
Ramoni Adeogun
In this paper, we investigated the capacity and bit error rate (BER) performance of Multiple Input Multiple Output (MIMO) satellite systems with single and multiple dual polarized satellites in geostationary orbit and a mobile ground receiving station with multiple antennas. We evaluated the effects of both system parameters such as number of satellites, number of receive antennas, and SNR and environmental factors including atmospheric signal attenuations and signal phase disturbances on the overall system performance using both analytical and spatial models for MIMO satellite systems.DOI:http://dx.doi.org/10.11591/ijece.v4i4.5349
Volume: 4
Issue: 4
Page: 614-622
Publish at: 2014-08-01

Conceptual Search Based on Semantic Relatedness

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3762
Abdoulahi Boubacar , Zhendong Niu
Traditional search engines based on syntactic search are unable to solve key issues like synonymy and polysemy. Solving these issues leads to the invention of the semantic web. The semantic search engines indeed overcome these issues. Nowadays the most important part of the data remains unstructured documents. It is consequently very time consuming to annotate such big data. Concept based retrieval systems intend to manage directly unstructured documents. Semantic relationships are their main feature to extend syntactic search. In most of the methods implemented so far, concepts are used for both indexing and searching. Words remain the smallest unit to process semantic relatedness. The differences persist in the way that concepts are represented, mapped to each other, and managed for the sake of indexing and/or searching. Our approach is based on Wikipedia concepts. Concepts are represented as an undirected graph. Their semantic relatedness are computed with a distance derived from a semantic similarity measure. The same distance is used to calculate both semantic relatedness and query matching. DOI:  http://dx.doi.org/10.11591/telkomnika.v12i8.5143 
Volume: 12
Issue: 8
Page: 6380-6385
Publish at: 2014-08-01

Comparison of FACTS Devices for Two Area Power System Stability Enhancement using MATLAB Modelling

10.11591/ijape.v3.i2.pp130-139
J. N. Rai , Naimul Hasan , B. B. Arora
Modern Power Transmission networks are becoming increasingly stressed due to growing demand and restrictions on building new lines. Losing stability is one of the major threat of such a stressed system following a disturbance. Flexible ac transmission system (FACTS) devices are found to be very effective in a transmission network for better utilization of its existing facilities without sacrificing the desired stability margin. The static synchronous compensator (STATCOM) and Static Var Compensator (SVC) are the shunt devices of the flexible AC transmission systems (FACTS) family. When system voltage is low, STATCOM generates reactive power and when system voltage is high it absorbs reactive power whereas the Static Var compensator provides the fast acting dynamic compensation in case of severe faults. In this Paper, the performance of SVC is compared with the performance of STATCOM. Proposed controllers are implemented using MATLAB/SIMULINK. Simulation results indicate that the STATCOM controller installed with two machine systems provides better damping characteristics in rotor angle as compared to two machine system installed with SVC. Thus, transient stability enhancement of the two machine system installed with STATCOM is better than that installed with SVC.
Volume: 3
Issue: 2
Page: 130-139
Publish at: 2014-08-01
1 2 3
...
1906 1907
Show 1695 of 1907

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration