Call for Papers

Abstract: This paper proposed a new wavelet based method to identify inrush currents and to distinguish it from power system faults. The proposed algorithm extracts fault and inrush generated transient signals using DWT. Transient current signals at both sides of a transformer are firstly captured. The wavelet transform is a relatively new and powerful tool in the analysis of power transformer transient phenomena because of its ability to extract information from the transient signals simultaneously in both time and frequency domain. These currents are analyzed by wavelet transform from which the detail coefficient of each phase is derived. In this proposed method, the wavelet transform is firstly applied to decompose the differential current signals of power transformer. The MLE (Maximum Likelihood Estimate) values of each of detail coefficient is calculated and compared with threshold values to detect and identify the type of faults. The extracted information from transient signals is simultaneously in both time and frequency domains. In this study, Daubechies 6 wavelets are used to construct first level filter bank to extract the transients. To discriminate the Inrush current and external faults like Line –Line fault, Line –Ground Fault, 3-Φ Fault using wavelet algorithm. And to prevent protective devices to mal operate for inrush, and external faults.

Keywords: Inrush current, MLE, differential current, fault current.

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Abstract

Size Reduction and Bandwidth Enhancement of Microstrip Patch Antenna by Proper Positioning of Patch above the Defected Ground Plane

MADAN MOHAN, SUDIPTA DAS, SHAMBHU MAHATO, ASHWANI KUMAR CHAUDHARY

Abstract: article, a single layer reduced size broadband microstrip antenna with properly positioned In this patch placed above defected ground plane has been successfully implemented. The size of the antenna is reduced with large enhancement in bandwidth by defecting the ground plane and proper positioning of the patch with respect to the defected ground plane. With theproposed design, a maximum size reduction of 75% in the antenna is obtained with respect to the conventional microstrip patch antenna on an infinite ground plane. The measuredresult shows -10dB return loss bandwidth of about 3.02 GHz (2.85-5.87GHz) and 1.4 GHz(7.10-8.5GHz) which are 69% and 18% respectively around their center frequencies. The overall dimensions of the proposed antenna (24x20x1.5875mm3) can be easily applied for WLAN, HiPERLAN, HisWaNa and WiMAX applications

Keywords: Bandwidth Enhancement, Defected Ground Plane, Microstrip Patch Antenna, Size Reduction, Wireless Communication

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Abstract

Smart Grid Integration for Power Quality in Grid System

S.A.BHONDE, DR.S.B.BODKHE, DR.S.W.MOHOD

Abstract: The increase penetration of renewable energy, use of electronic load in to the electric grid which involves a challenge regarding the power quality issues and energy management. These penetrations will increase harmonic distortion, frequent switching of load will result in flicker. This paper presents an implementation of power control scheme & communication scheme in smart grid integration for maintaining power quality and for managing energy in the grid system. The integration of smart grid is equipped with voltage source converter attached to the renewable sources, conventional energy generators and storage systems. The primary power control scheme is the voltage source converters operated in current controlled mode with hysteresis control in order to maintain power quality requirements in distributed system .The secondary scheme involves the use of a distributed communication architecture based on Experimental Physics and Industrial Control system (EPICS) to manage all the information generated in grid system and help in a smart grid for managing energy norms. Test results are presented to demonstrate the effectiveness of the control and the communication architecture used for maintaining power quality in smart grid integration.

Keywords: Harmonic compensation, Renewable Energy Source Integration, Smart grid

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Abstract

Study of Magneto Optic Sensor Using Tdg Element

PRIYATOSH MAHISH, SARBANI CHAKRABARTY

Abstract: The magneto optic sensor is very fast (at the speed of light), sensitive, non-contact and EMI (electromagnetic interference) proof in operation. It senses magnetic flux density by rotating the plane of polarization of the incident beam of light passing through it based on Faraday Effect. The amount of rotation depends on the property (Verdet Constant) of the magneto-optic element and the magnetic flux density. The general behaviour of this sensor is nonlinear. But under certain condition it shows linear nature over a certain range about an operating point which can be utilized in various applications. In this project this linear region of operation has been found and selected. The system can be used as an optical switch operated by current. Terbium Doped Glass cylinder is used in the experimental setup as the magneto optic element which is of length 30 mm, diameter 10 mm and with Verdet constant -104.42 rad/T m at the wavelength of 543 nm. The magnetic flux density is produced by passing the current through a solenoid.

Keywords: Polarization, TDG, Malu’s Law, Mueller matrices, Polarizer, Analyzer, Stokes vector.

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Abstract

Enhanced Loadability of Existing Ehvac Line by Combined Ac-Dc Transmission System

Y.PRAVEEN KUMAR REDDY, K.SHOBHA RANI, N.G.V.SATYA KUMAR, P.NAGARJUNA, P.SRAVANTHI

Abstract: Now-a-days, demand for electric power has shown steady but geographically uneven growth.The wheeling of the available energy through existing long ac lines to load centers has a certain upper limit due to stability considerations. Thermal limit is the major limit to be considered while increasing loadability of existing EHV long transmission lines. Thus, these lines cannot be loaded to their thermal limit to keep sufficient margin against transient instability. This paper presents the concept of composite ac-dc power transmission. The conductors are allowed to carry usual ac along with dc superimposed on it. This will load the transmission lines close to its thermal limit thereby increasing the stability of the system. This paper presents the feasibility of converting a double circuit ac line into composite ac–dc power transmission line to get the advantages of parallel ac–dc transmission to improve stability and damping out oscillations. No alterations of conductors, insulator strings, and towers of the original line are needed. The proposed scheme is digitally simulated with the help of MATLAB software package. Simulation results clearly indicate the substantial increase in loadability of existing EHV AC lines by combined ac-dc transmission.

Keywords: Extra high voltage (EHV) transmission, MATLAB simulation, simultaneous ac-dc transmission

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Abstract

Ber Perfomance Of Ldpc & Rs Code In Stbc – Ofdm System

SANDEEEP TIWARI, ANGEETA HIRWE, RUPESH DUBEY

Abstract: We Analysis will be carried out for an OFDM wireless communication system using space time block code (STBC) at the transmitter and considering the effect and the wireless channel like delay spread and fading. The analysis will include the effect of imperfect timing recovery at the output of the receiver. In this contribution both Low-Density Parity-Check (LDPC) coding and RS coding space-time block coded OFDM is investigated. We analysis this paper comparing the coding technique (Ldpc & Rs code) using multiple transmit & receiving antenna in digital modulation technique BPSK , QPSK over and additive white Gaussian noise (AWGN) and other fading (Rayleigh and Rician) channel. It is anticipated from the BER simulation that the performance of the communication system degrades with the increase of noise power.

Keywords: Additive white Gaussian noise (AWGN), Low density parity cheak (LDPC), RS code , Bit error rate (BER) , Orthogonal frequency division multiplexing (OFDM) Multiple antenna ,Space time block coding (STBC)

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Abstract

Decode-And-Forward Full Duplex relaying in MIMO - OFDMA Systems

RAJESH PATIDAR, SHUBHA DUWASHA, RUPESH DUBEY

Abstract: Co-operative communication with relay assistance helps in enhancing the capacity of point to point links. Next-generation wireless communication systems require higher spectral efficiency and macroscopic coverage to support the quality of service needed for a wide variety of multimedia applications. Much research has been devoted to enhancing the spectral efficiency of wireless communication systems. Among these, relay based communication systems have attracted a great deal of attention thanks to their potential to deliver extended cell coverage and reduced power consumption. We discuss resource efficiency in relay systems, particularly in two-way and full-duplex relay systems that utilize multiple antennas and improved duplexing to enhance system efficiency. Besides, a theoretically optimal hybrid relaying, which allows a dynamic selection between AF relaying and DF relaying protocols with full- duplex relays or half-duplex relays, is also considered in the problem formulation and serves as a performance benchmark. . Simulation results demonstrate that the proposed source and relay design algorithms perform much better than the existing techniques in terms of probability of error Vs transmit power.

Keywords: Amplify-and-forward relays, Decode-and-forward relays, full-duplex relaying, half-duplex relaying distributed resource allocation, multiuser diversity.

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Abstract

Transmit-Diversity for Spatial-Modulation (SM) & Space-Time Block Codes (STBC)

RAHUL SAXENA, PROF. RUPESH DUBEY, PROF. POONAM LILHARE

Abstract: In multiple antenna transmission the multiplexing gain strictly depends on transmit and receive antenna allocation, transmit antenna synchronization and the process used to eliminate the inter channel interference (ICI). Spatial modulation (SM) is a low-complexity scheme for multiple antenna system. The work and research on Spatial Modulation shows that SM is useful to achieve the multi block-code (STBCs) and then splits into n streams which are simultaneously transmitted using n transmitted antenna. Maximum-Likelihood (ML) decoding is achieved by a simple way thro different antenna rather than a joint detection. In other words SM is novel modulation techniques which combines the high multiplexing gain provided by the Spatial Modulation and transmit diversity gain pro (STBCs) technology.

Keywords: Multiple-Input Multiple-Output (MIMO) system, Maximum Likelihood decoding, Rayleigh fading channel, Spatial Modulation (SM), Space-Time Block

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Abstract

PSO optimized SVD based signal detector for Cognitive radio Networks

NIDHI CHANDEL, RAJESH B. AHIRWAR, RUPESH DUBEY

Abstract: Spectrum sensing is the basic component in cognitive radio. This paper value decomposition (SVD) and particle swarm optimization (PSO) optim detect the presence of primary wireless signal. We simulated the algorithm using common digital signal communication namely rectangular pulse, raised cosine and root This algorithm is suitable for blind spectrum sensing where the properties of the signal to be detected are unknown. Simulation results show that PSO optimized SVD gives better result in the low signal to noise (SNR) environment

Keywords: Cognitive radio, Particle swarm optimization, S algorithm, Spectrum sensing.

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Abstract

Memory Debug Using Bist

MS.SYED SUMERA ALI

Abstract: Built –in self test (BIST) are best tested in Embedded Memories such as RAMs and ROMs. The use of BIST is for manufacturing or production testing with additional features for diagnostics and debug [1].This paper present a study on memory debug methodology using BIST in system-on-chip (SOC) product development and yield ramp-up and describes diagnosis techniques during rapid development of semiconductor memories for catching the design and manufacturing failures and improving over all yield and quality[2]. It also covers MARCH based memory diagnosis algorithm which locate fault cells also identified their types, using the proposed algorithm stuck-at-faults, state coupling faults, transition faults can be distinguished. With all of these, defect diagnosis and Field application (FA) engineer can be performed automatically using the fault patterns, reducing the time in yield improvement [3]. The main purpose of this algorithm is accelerating fault diagnosis for semiconductor memories. Design is described using verilog HDL simulation is carried out using Modelsim simulator synthesis is done using Xilinx ISE Implementation is done on Spartan 3e FPGA .

Keywords: Memory debug algorithm , March 17n algorithm , BIST

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Abstract

A Single-Stage Full-Bridge Series-Resonant Buck-Boost Inverter (Full-Bridge Topology)

P.V.S.ADITYA, C.SOMASANKARAPPA, G.NAGA RAJU, K.SUJESH

Abstract: This Paper is to extract the underlying A single-stage full-bridge series-resonant buck-boost inverter (FB- SRBBI) is proposed in this paper. The proposed inverter only includes a full-bridge topology and a LC resonant tank without auxiliary switches. The output voltage of the proposed inverter can be larger or lower than the dc input voltage, depending on the instantaneous duty-cycle. This property is not found in the classical voltage source inverter, which produces an ac output instantaneous voltage always lower than the dc input voltage.The proposed inverter circuit topology provides the main switch for turn-on at ZCS by a resonant tank. The nonlinear control strategy is designed against the input dc perturbation and achieves well dynamic regulation. An average approach is employed to analyze the system. A design example of dc/ac inverter is examined to assess the inverter performance and it provides high power efficiency above 80% under the rated power.
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Keywords: High-Voltage Direct Current (Hvdc) Power Transmission, Three phase inverter,buck boost inverter, Transformer, Eight level deep hardware stack

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Abstract

Simulation of IPMSM Sensorless Drive and Identification of Permanent Magnet Rotor Flux By Extended Kalman Filter

N.G.V.SATYA KUMAR, S.SHAMSHUL HAQ, A.MALLIKARJUNA PRASAD, S.THIRUMALAIAH

Abstract: Interior permanent magnet synchronous motor (IPMSM) has buried magnets in the rotor core possesses mechanically robust construction, can also be used in high speed applications. This motor has high performance because of neglected rotor copper losses. In this paper the drive is tested for speeds adjusting during its operation. A rotor flux oriented vector control with model reference adaptive system (MRAS) based rotor position/speed estimation is implemented as the basic control strategy for IPMSM drive. An identification scheme based on Extended Kalman Filter for the permanent magnet flux of IPMSM is proposed. The simulation results of MATLAB/SIMULINK model shows very good dynamic response. Hence this drive can be used in high speed as well as low speed applications.

Keywords: Extended Kalman filter (EKF), Model reference adaptive system (MRAS), interior permanent magnet synchronous motor (IPMSM), Vector Control

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Abstract

Simulation and Implementation of Two-Quadrant Operation of Mains Operated DC Drive System

RAMYASREE P R, DR. R. SANKARAN

Abstract: This paper is concerned with the 2-quadrant operation of a DC shunt machine operated from AC mains, focusing on the control circuits for regeneration of power. It covers modelling, simulation and hardware implementation of the motoring and generating modes on a 3.7 kW 220V 1500 RPM DC shunt machine coupled to a cage induction motor. An IGBT based full bridge power electronics module works as a converter or inverter for realizing the 2 quadrants, where the voltage polarity remains the same, but the current direction gets reversed. Simulation and experimental results covering the 2 modes of operation are presented

Keywords: DC Machine, 2-quadrant operation, regeneration, IGBT inverter

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