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Electrical Engineering, 2007. ICEE '07. International Conference on

Date 11-12 April 2007

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Displaying Results 1 - 25 of 82
  • Reed Solomon coded PPM for Terrestrial FSO Links

    Publication Year: 2007 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1559 KB) |  | HTML iconHTML  

    Free space optical communications (FSO) are fast emerging as the most promising approach for addressing the emerging broadband access network and its "last mile" bottleneck. However, atmospheric attenuations and weather dependence remain the major hurdle in the wide scale acceptability of the technology. This paper proposes performance enhancement using higher state modulation schemes (i.e. 16 and 256-PPM) which promises a gain upto 25 dB when combined with RS codes as compared to the current widely used 2 state modulation mechanisms. The "RS-coded PPM" is shown as an extremely robust and well performing coded-modulation scheme for future FSO systems using a novel approach to terrestrial FSO channel modeling. View full abstract»

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  • New Three-Level Voltage Source Inverter with Different 25 Space Voltage Vectors

    Publication Year: 2007 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6462 KB) |  | HTML iconHTML  

    This paper presents a new switching strategy controlling a new three-level voltage source inverter, resulting in different 25 space voltage-vectors. The new inverter combines some desirable features of two and three-level inverters. The proposed open-leg switching strategy intentionally opens one of the three inverter-legs per-time, in a pre-planned sequence. Thus, the number of allowed states becomes 64 compared to 27 originally proposed by other modulation strategies. For a wye-connected load operating at low modulation index (M<0.5 p.u.), the output phase-voltage becomes a seven-level, 12-step waveform, instead of the 6-step one. Thus, tie total harmonic distortion is highly reduced. Three new conduction-modes are presented, each verifies a reduced common-mode-voltage time-variation (dv/dt), low third harmonic content, and reduced switching frequency harmonics. For higher modulation indexes, a 4th conduction mode is presented, eliminating the low frequency harmonics in the neutral-point current, consequently reducing the dc-link capacitors sizes, and cost. Analytical models, computer simulation results, and experimental verification are presented. View full abstract»

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  • Design and Development of Magnetic Torque Couplers and Magnetic Gears

    Publication Year: 2007 , Page(s): 1 - 5
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2710 KB) |  | HTML iconHTML  

    New breed of permanent magnets are increasingly being used in novel permanent magnet electromechanical devices. This paper deals with the application of rare-earth magnets in the design of synchronous magnetic torque couplers and magnet gears. The performance of experimental devices is compared with finite element analysis. View full abstract»

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  • Faults Location in High Voltage Transmission System using ICA

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6042 KB) |  | HTML iconHTML  

    Various methods for fault location in transmission lines have been proposed in the literature. This work presents an alternative method based upon the analysis of independent components (ICA) to localize the distance at which single-phase, two-phase, two-phase grounding and three-phase faults occur in a 500 kV transmission system starting from different angles of fault incidence at different distances along the line together with fault signals or travelling waves subject to other perturbations unrelated with the desired fault signal at the fault distance placement. Simulation results of a 500kV high voltage transmission system got with the software Alternative transients program (ATP) show that the proposed methodology implemented with Matlab is a rather efficient tod for various fault types location. View full abstract»

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  • Reconstructing a Class of Cipher Systems Used in Wireless Digital Communications

    Publication Year: 2007 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1619 KB) |  | HTML iconHTML  

    This paper presents improvement in the ciphertext only reconstruction technique of LFSR based stream ciphers. The original algorithm involves huge computations and requires a large number of ciphertext bits to be processed (for original article by A. Canteaut and E. Filiol, see FSE 2000, LCNS 1978, Spriger Verlag, 2001) . We present techniques to increase the efficiency of the reconstruction algorithm and reduce the computation time. In this regards, the first improvement is achieved by modifying the decision threshold value according to the available ciphertext bits. With this, we achieved a reduction by one fourth in the computation time as well as the minimum ciphertext requirement. Further improvement is achieved by the parallelization of the algorithm. Experimental results of the improvement in computation time and efficiency have been detailed. A generalization of the reconstruction technique to a wide range of stream ciphers is also presented. View full abstract»

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  • Model-Predicted Induction Motor Behaviour under Different Operating Conditions

    Publication Year: 2007 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3959 KB) |  | HTML iconHTML  

    This paper presents a simulation study to verify the capability of the instantaneous phase variation (IPV) for the detection of broken rotor bar faults in a squirrel cage induction motor. The three-phase squirrel cage motor model has been derived using a multi coupled circuits approach. The obtained results show that IPV has a good detection and diagnosis capabilities especially at full load conditions. View full abstract»

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  • Simulation of Pulse Propagation in a Bire-Fringent Medium using Adaptive Step Size Method

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3584 KB) |  | HTML iconHTML  

    Nowadays mostly single mode fibers are in use. Even a single mode fiber comprises of two modes, an input pulse is splitted along fast axis (x-axis) and slow axis (y-axis). The splitting of single pulse into two pulses and being propagated at suitable intensities inside a single mode fiber makes it undergo various non-linear phenomena. Proper management of the above mentioned non-linear phenomenon can make them useful for the communication systems. One very important phenomenon is utilization of Kerr effect into a fast saturable absorber action. The fast saturable absorber action can be utilized to formulate a self starting passively mode locked ring fiber laser. Study of pulse propagation in birefringent medium has been carried out using adaptive step size method Adaptive step size method is proven for efficient and accurate results. View full abstract»

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  • A Proposed Preventive Information Security System

    Publication Year: 2007 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5220 KB) |  | HTML iconHTML  

    Managing computer and network security programs has become an increasingly difficult and challenging job. Dramatic advances in computing and communications technology during the past few years have redirected the focus of data processing from the computing center to the terminals in individual offices and homes. The result is that managers must now monitor security on a more widely dispersed level. These changes are continuing to accelerate, making the security manager's job increasingly difficult. In this paper a better solution for Information Security management has been proposed by designing PrISM (Preventive Information Security Management). PrISM aims to develop and deploy an indigenous Information Security Management System (ISMS) with intrusion prevention capabilities. The objective is to develop an ISMS with appropriate security assurance controls and risk handling processes. This will provide best protection of critical assets against information warfare attacks. The task has been planned by performing reverse engineering of Open Source Security Information Management (OSSIM) system. A detailed discussion on OSSIM and commercially available software Event Horizon has also been presented. View full abstract»

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  • Prediction of Protein Sub-Cellular Localization through Weighted Combination of Classifiers

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4067 KB) |  | HTML iconHTML  

    Prediction of subcellular localization of proteins is an important step in genome annotation and in search for achieving novel drug targets. Conducting experiments for extracting information about protein sub cellular localization is both time consuming and costly effort. Machine learning approaches, especially, ensemble of classifiers, providing efficient and reliable mechanism of computational prediction are thus highly desired In this context, we propose a modification to the approach proposed in [K. C. Chou, J. Cell. Biol. 99(2006)517]. We have used a weighted polling method to fuse the output of individual covariant discriminant classifiers. The individual classifiers are trained on features based on pseudo-amino add composition of proteins. Three methods of verifications; re-substitution, Jackknife, and independent data set tests have been employed and give over all accuracies of 87.13%, 71.15% and 74.90% respectively. The predicted accuracies are higher than that of the existing schemes. View full abstract»

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  • Task Partitioning-An Efficient Scalable Pipelined Digital Design Scheme

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    Digital circuits are designed after careful investigation of implementation constraints and limitations. Implemented circuits, whether realized on FPGA or an ASIC is developed, it is made sure that resulting design should be optimized with respect to processing speed and area occupied. Much informative work has been already proposed and effective results have obtained in the research field of processing speed and area optimization. In this paper, the concept of hierarchical concurrent flow graph (HCFG) is utilized to present proposed coarse grained layered scalable concurrent image compression (LSCIC) precoder design with pipelined scheme. This design causes all modules to operate concurrently for fast and minimum data loss operation. This scheme will not only highlight the task partitioning procedure to operate all modules in parallel but also gives rise to the concept of pipelining with reasonable number of stages so that system remains optimized. Moreover, practical solutions acquired by simulating tools are presented in this paper with appropriate substantiation. This paper also addresses the issue of selected FPGA resource utilization depending upon the complexity of operation and hardware components placed in corresponding module. View full abstract»

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  • Performance of Wavelet - Based Threshold Selection Schemes for Watermark Detection

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1412 KB) |  | HTML iconHTML  

    Watermark detection can be considered as an estimation problem in which the watermark sequence has to be estimated from a possibly distorted image. In this paper, we use wavelet threshold estimation for extraction of watermark sequence. The correlation matching is then used for checking for the presence of the watermark. It is shown that the performance of this method is superior to that of correlation matching. The performance of two threshold selection methods are compared for this purpose. The watermark embedding is performed in wavelet domain. View full abstract»

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  • Deregulation of Electrical Power System Network as Utility in Developing Countries with Special Reference to Pakistan

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1980 KB) |  | HTML iconHTML  

    This paper picturesquely depicts the deregulated trend in the developed and developing countries as a comparison. All the three major sectors i.e. generation, transmission & distribution of electrical power are discussed but the focus is on the transmission system network. This is because of the reason that this sector has not been explored fully and no documented guidelines are available in this sector. A clear elaboration regarding the role of regulatory body is also narrated with its responsibilities. The major problems are also discussed of the developed and developing countries with special reference to deregulation and restructuring practices going in Pakistan and also indicating die bottle necks, hindrances coming on die way as not to implement the deregulation in its clear concept. View full abstract»

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  • Encryption Efficiency Analysis and Security Evaluation of RC6 Block Cipher for Digital Images

    Publication Year: 2007 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4880 KB) |  | HTML iconHTML  

    This paper investigates the encryption efficiency of RC6 block cipher application to digital images, introducing a mathematical measure for encryption efficiency, which we will call the encryption quality instead of visual inspection. The encryption quality of RC6 block cipher is investigated among its several design parameters such as word size, number of rounds, and secret key length and the optimal choices for the best values of such design parameters are given. Also, the security analysis of RC6 block cipher for digital images is investigated from strict cryptographic viewpoint. The security estimations of RC6 block cipher for digital images against brute-force, statistical, and differential attacks are explored. Experiments are made to test the security of RC6 block cipher for digital images against all aforementioned types of attacks. Experiments and results verify and prove that RC6 block cipher is highly secure for real-time image encryption from cryptographic viewpoint. Thorough experimental tests are carried out with detailed analysis, demonstrating the high security of RC6 block cipher algorithm. So, RC6 block cipher can be considered to be a real-time secure symmetric encryption for digital images. View full abstract»

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  • Fuzzy Logic Based Speed Control of a Permanent Magnet Brushless DC Motor Drive

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2807 KB) |  | HTML iconHTML  

    This paper presents an analysis by which the dynamic performances of a permanent magnet brushless DC (PMBLDC) motor drive with different speed controllers can be successfully predicted. The control structure of the proposed drive system is described The dynamics of the drive system with a classical proportional-integral (PI) and a fuzzy-logic (FL) speed controllers are presented. The simulation result; for different parameters and operation modes of the drive system are investigated and compared The results with FL speed controller show improvement in transient response of the PMBLDC drive over conventional PI controller. Moreover, useful conclusions stemmed from such a study which is thought of good use and valuable for users of these controllers. View full abstract»

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  • FACTS Control Devices (Statcom, SSSC and UPFC) Re-Configuration Techniques By PSIM/MATLAB

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3518 KB) |  | HTML iconHTML  

    This paper discusses comprehensively the dynamic performance of the FACTS control devices in multiple operations, hardware needed to complement the simulated models. This paper also presents the schematic and basic control of reconfigurable FACTS devices to realize the major voltage source converter FACTS Topologies: SATCOM, SSSC (Static synchronous Series compensator), UPFC. Furthermore, these control paradigms proposed in three prompt strategic directions to overcome outdated conventional control and other power control flaws in Pakistan power utilities wherein, including our neighboring countries (Iran, KSA, and India), and world-at-large, the FACTS been installed and in operation successfully. Whereas, Pakistan desperately needs this technology to hedge its power utilities to meet forthcoming challenges in power industry likewise significant growth in industry as well as domestic users under the declaration of government electrifying Pakistan 2007 to tap out power to its all rural areas by undertaking all possible means. Henceforth, the FACTS technology is an instrumental solution which will play vital and viable role to make this decree possible in following streams in parallel: Set-up FACTS Laboratory at UET to develop prototype devices, FACTS feasibility study and a pilot project (at most contaminated area). This paper also culminates and enlists all three experiment results to encourage the elective/graduate course in electric power system. View full abstract»

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  • EM-Based Channel Estimation Algorithms for MIMO Turbo Receivers

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3508 KB) |  | HTML iconHTML  

    Multiple-input multiple-output (MIMO) systems combined with orthogonal frequency division multiplexing (OFDM), can improve communication quality and capacity. In this paper, we consider channel estimation issue in a MIMO-OFDM system using low-density parity-check (LDPC) codes at transmitter and iterative detection based on a maximum a posteriori (MAP) demodulator and a soft LDPC decoder at receiver. We first consider a previously proposed solution based on least-square estimator (USE). Since matrix inversion is required in LSE algorithms, their computational cost for implementation is high. Then, we resort to the expectation-maximization (EM)-type algorithms, which significantly reduce the complexity of the channel estimation, and propose a modified turbo receiver for LDPC-coded MIMO-OFDM systems which performs the channel estimation by space alternating generalized EM (SAGE) algorithm. Based on simulation results, the performance of the proposed receiver is quite satisfying. View full abstract»

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  • Design and Development of a Six-Legged Robot with Simplified Control Architecture

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3371 KB) |  | HTML iconHTML  

    A six-legged robot named 'Mechatron-1' has been developed. This paper contains a description of the design and working of the robot. A thorough study of its leg motion has been done in order to perform a stability analysis based upon the minimum longitudinal stability margin criteria. The main emphasis in the robot's structural design was to reduce the controller complexity required for proper operation. Mechatron-1 is a wave gait robot designed for general applications in everyday human environment. View full abstract»

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  • A Photo-Voltaic System with Load Control

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2573 KB) |  | HTML iconHTML  

    This paper describes the design of a fixed photo-voltaic (PV) system that consists of the modules array, DC-AC inverter and switches. The short-circuit current and open-circuit voltage of the 66 modules of the system have been investigated in natural conditions. The PV system, with the crystalline and multi-crystalline modules of area 0.384 m2, and 0.391 m2 respectively, is able to provide an average electric power of ~1.6 kW. The inclination angle between the module and the horizontal plane was equal to 45deg. Current-voltage characteristics of the PV system were obtained by simulation at different intensities of solar radiation. Matching of the PV system with load was done by load control method: end-users are switched automatically to provide optimum power transfer from PV generator into load at variable intensity of solar radiation. The PV system can be operated in the mode of grid-connected or stand alone modes. The cost and benefit analysis of the designed PV system was done. View full abstract»

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  • Role of Nanofillers in Induction Motor Enamelled Wires Exposed to PWM-VSC Waveforms

    Publication Year: 2007 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4923 KB) |  | HTML iconHTML  

    In this research work, the performance of enamelled wires with and without nanofiller in the coating is investigated. The wire specimens are exposed to PWM-VSC waveforms. After partial discharge erosion (PD) on enamel wire coatings, the surface roughness is measured by using image-tod software. In all investigations, the images used, are captured by using scanning electron microscope (SEM). The experimental results revealed that the surface erosion in the specimens without nanofiller is considerably greater compared to the specimens with ~1%, by wt, nanofillers. The statistical analysis, using Weibull distribution of dielectric strength data, show that the value of the shape parameter increases tremendously, which indicates that the coatings with nanofillers becomes more homogeneous and exhibits fewer defects. View full abstract»

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  • Lossless Watermarking Using Bandelet and Optimal Matrix Norms

    Publication Year: 2007 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2069 KB) |  | HTML iconHTML  

    In this paper, a multi-frequency lossless watermarking algorithm that the original image need not been destroyed is proposed by using bandelet and optimal matrix norms. The wavelet transform is first performed to the original image, the bandelet transform is then applied to the high and middle frequency parts of the transformed image, and the texture and edge traced by using the geometric flow via feature of the image to yield the high frequency lossless watermarking. For low frequency part of wavelet coefficients, by selecting optimal matrix norm, a low frequency watermarking scheme is also achieved. A lossless watermarking approach composed of multi-frequency information is then proposed. The experimental tests show the proposed watermarking system is evaluated against standard watermarking attacks. View full abstract»

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  • Effect of Group Size on Anycasting with Receiver Base Forwarding in Delay Tolerant Networks

    Publication Year: 2007 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3375 KB) |  | HTML iconHTML  

    Delay/disruption tolerant networks (DTNs) are known for frequent and long duration partitions and end-to-end connectivity may be absent between the source and the destination. Anycast service is used for applications such as information exchange in hazards/crisis situation, recourse discovery, etc in Delay Tolerant Networks. For a specific type of DTN, where the mobile nodes are sparsely distributed, communicating via low radio range experience frequent and long duration partition and end-to-end path may not be present at the time of message generation. We have proposed a Receiver Based Forwarding (RBF) scheme for anycasting in DTN, which considers the path length as well as the number of receivers in forwarding the anycast bundle to the next hop Group size plays an important role in DTN anycasting, the group size varies in different scenarios. In this paper we have studied the effect of group size on our proposed Anycasting protocol by varying the group size from 3 to 15. Our simulation results have shown that the RBF performs better than the normal forwarding (NF) in term of data delivery ratio, average end-to-end delay and overall data efficiency because the probability of available receivers increases. View full abstract»

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  • Dynamic Priority Based Message Scheduling on Controller Area Network

    Publication Year: 2007 , Page(s): 1 - 6
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4440 KB) |  | HTML iconHTML  

    Controller area network (CAN) is a serial communication protocol developed in early 1980's by Robert Bosch. Low cost, ease of use and ability to work in harsh EMI environments have resulted in its widespread acceptance in automotive and automation industry. Message scheduling and access to the bus in CAN is performed through a fixed Message Identifier field, which is also the basis for a static priority. Although this fixed priority apparently results in good bus utilization but low priority messages may suffer from starvation due to an ill designed message identifier allocation scheme. Also with its introduction into newer fields, the fixed priority per message is looking to be a limitation for some applications. Un till now there has been no work to add this faculty to CAN in a standardize way. This paper presents a set of algorithms and guide lines to support the dynamically changing priorities in a CAN network without breaking the integration with existing CAN based networks. The scheme is effectively a generalization of the single priority per message to a multi-priority-window per message. View full abstract»

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  • A Subspace Approach for Speech Enhancement Using Frame-Level AdaBoost Classification

    Publication Year: 2007 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2183 KB) |  | HTML iconHTML  

    An efficient approach for noise suppression in speech is presented in this paper. The basic idea is taken from signal subspace analysis, which is employed for noise reduction in speech. Different other subspace approaches assumed the estimation of noise from the initial silence or unvoiced portion of the speech signal and the noise was considered to be same and present throughout the signal. The problem of noise suppression and its solution has to be modified when the noise becomes time-varying and has to be detected more accurately, instead of its crude estimation from unvoiced speech or silence. This needs an accurate classification for noise of different types which are experienced practically. In this paper an AdaBoost classifier is used to discriminate noise (colored/white, persistent/time-varying) from the corrupted voiced part of the speech. In this way the noise can be detected and estimated in each noise-only frame. Then the signal subspace technique can be used for speech enhancement. This approach produces significantly better result as compared to other signal subspace speech enhancement techniques. View full abstract»

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  • A New Resonant Driver for Switched Reluctance Motor

    Publication Year: 2007 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2733 KB) |  | HTML iconHTML  

    The switched reluctance motor (SRM) drive is receiving increasing attentions from various researchers as well as industry as a viable candidate for adjustable speed and servo applications. Combining the unique features of an SRM with simple and efficient power converter that is uses, a superior motor drive system emerges which may be preferable for many applications compared to other AC or DC motor drive systems. although a number of converters have emerged over the years for SRM drives, but every single driver has its own advantages and drawbacks and there has always been a trade-off between gaining some of the advantages and losing some when a new drivers is offered. In this paper we present a new driver for switched reluctance motor. The driver features zero-current switching. It means all the switching operations are done when the phase current crosses the zero level, therefore it reduces the overall power loss in the switching process. Also provides faster rate of rise and fall of current which helps the motor to operate at higher speeds when the resonance phenomenon is employed. Keywords: Switched Reluctance Motor, Resonant Drive Circuit, SRM Drive, Resonant Driver. View full abstract»

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  • Analysis of TSR-based SVC for a Three-Phase System with Static and Dynamic Loads

    Publication Year: 2007 , Page(s): 1 - 6
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4144 KB) |  | HTML iconHTML  

    In this paper, the effect of the thyristor switched reactor-based static VAr compensator (SVC), which is one of flexible AC transmission systems (FACTS) controllers, to load voltages has been proposed in the three-phase system at static load and dynamic load conditions. The design and testing of TS R-based SVC are verified using the MATLAB/Simulink 7.04reg and Power Systems Toolbox. The results show that significant improvement on reactive power compensation and bus voltage regulation could be achieved by using the TSR-based SVC. Also, harmonic levels generated by TSR-based SVC do not cause to instability in the test system. View full abstract»

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