iosr-JEEE   Volume-2 ~ Issue-6

Abstract: A model of a delta-connected three-phase stand alone induction generator (SEIG) feeding a deltaconnected load is derived and presented. This model includes the core losses where the core resistance is modeled as a function of the magnetizing reactance. Furthermore, the magnetizing reactance has been included in the negative sequence equivalent circuit as a variable. The model is applicable to R-L, R-C or resistive and three phase or single phase loads, balanced or unbalanced with any degree of unbalance. The SEIG performance has been computed for different single phase loading conditions iteratively. These results are confirmed experimentally..
Keywords -induction generator, unbalance, stand alone, SEIG..

[1] Mekkaoui, N., Nait-Said, M.-S., Drid, S.," Steady-state analysis of Self -Excited Induction Generator", in Proc. International Conference on communications, Computing and Control Applications (CCCA), pp. 1-5, 2011.
[2] Elder, J., Boys, J., and Woodward, J., "The Process of Self Excitation in Induction Generators", ibid, (130), pt. B., No. 2, pp. 103-107, 1983.
[3] Haque, M. H.," A Novel Method of Evaluating Performance Characteristics of a Self-Excited Induction Generator ", IEEE Trans., EC-24(2), pp. 358-365, 2009.
[4] Raina, G., and Malik, O., "Wind Energy Conversion Using a Self-Excited Induction Generator", ibid., Power System Apparatus, Vol. PAS-102(12), pp. 3933-3936, 1983.
[5] Grantham, C., Sutanto, D., and Mismail, B., "Steady State and Transient Analysis of Self-Excited Induction Generators", IEE Proc., pt. B, (136), No. 2, pp. 61-68, 1989.
[6] Malik, N., and Mazi, A., "Capacitance Requirements for Isolated Self-Excited Induction Generators", IEEE Trans., EC-2(1), pp. 62-69, 1987.
[7] Al-Jabri, A., and Alolah, A., "Capacitance Requirements for Isolated Self-Excited Induction Generators", IEE Proc., (137), pt. B, No. 3, pp. 154-159, 1990.
[8] Murthy, S.S., Kalla, U.K., Bhuvaneswari, G.," A Novel Electronic Controller Implementation for Voltage Regulation of Single Phase Self-Excited Induction Generator", in Proc. IEEE Industry Applications Society Annual Meeting (IAS), pp. 1-8, 2010.
[9] Tutkun, N., Arslsn, F.," Determination of capacitance range in the self-excited induction generator through the hybrid genetic algorithms ", in Proc. International Symposium on Power Electronics Electrical Drives Automation and Motion (SPEEDAM), pp. 1613-1617, 2010.
[10] Phumiphak, P., Chat-uthai, C.," Optimal capacitances compensation for short-shunt self-excited induction generator under inductive load", in Proc. International Conference on Electrical Machines and Systems (ICEMS), pp. 1-5, 2009.

Abstract: In recent years Unified Power Quality conditioner ( UPQC) is being used as universal active power conditioning device to mitigate both current as well as voltage harmonics in a polluted power system network. Both voltage source and current source inverter are in use for fabrication of UPQC. Current source UPQC has unique advantages over generalized voltage source UPQC. This paper presents a comparative analysis of voltage source and current source UPQC. A simple PI controller and robust hystersis band PWM technique is used for derivation of reference and switching signals respectively. The resultant compensation system eliminates voltage as well as current harmonics with good dynamic response. Extensive simulation results using Mat lab / Simulink for R-L load connected through an uncontrolled bridge rectifier is presented for performance comparison.
Keywords: CSI, current harmonics, hystersis controller, power quality conditioner, series active filter, shunt active filter, UPQC, voltage harmonics, VSI.

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Conference, PESC05, June 12-16, 2005, Recife, Brazil. pp. 2571-2577

Abstract:The Adjustable Speed Drives (ADS) are generally used in industry. In most drives AC motors are applied. The standard drives used are Induction Motors (IM) and recently Permanent Magnet Synchronous Motors (PMSM) are also used. Developments in power electronics and semiconductor technology have lead to improvements in power electronic systems. Different circuit configurations namely multilevel inverters have become popular and considerable research interest is generated in them. Variable voltage and frequency supply to AC drives is invariably obtained from a three-phase voltage source inverter. A number of Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply. The most widely used PWM schemes for three-phase voltage source inverters are carrier-based sinusoidal PWM and space vector PWM (SVPWM). There is an increasing trend of using SVPWM because of their easier digital realization and better DC bus utilization. This paper proposes SVPWM implementation of an Induction motor. The model of a three-phase voltage source inverter is discussed based on space vector theory. Simulation results are obtained using MATLAB/Simulink environment.
Keywords -Induction motor drive, MATLAB, Simulation. Space vector PWM; Voltage source inverter drive

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Abstract:Smart Message Language (SML) which is the definition of the German national standard for Automatic Meter Reading System, the SML system is mainly used in various metering devices like meter reading and billing systems. "SML is a wireless communication system which is based upon the Wi-Fi technology". In this, the Wireless Meter Reading system acts as a monitoring terminal of the hardware platform made up of Marvell 88W8686, the ARM7 processor and peripheral circuits, using micro C/OS-II operating system and LwIP protocol, . VC++ and MDB database is used to develop management software. SML protocol is adopted to design the format of the data frame to create a unified data structure for data procurement. The Wi-Fi communication module collects the information of the meter reading data from hardware which is then sent to the Access Point after being processed. Access Point transmits the data to the control center where the data is processed and stored into the database via wired network. Users can know the data or billing information by using the PC management software and the Users can pay the bills by using their Credit card. Thus SML system proves that this type of data structure improves the transmission efficiency and the performance of the system and is suitable for implementation in low-power embedded systems.
Keywords -Smart Message Language; Wireless Meter Reading; Data Structure

[1] Duan Qichang, and Dong Ping, "Network Data Transmission and Information Exchange of the Wireless Meter Reading System,"
Techniques of Automation and Application, vol.28, pp.39-41, March 2009.
[2] Das V. V., "Wireless Communication System for Energy Meter Reading," Advances in Recent Technologies in Communication
and Computing, 2009. pp. 896-898 ,October 2009
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[7] Fangchang Zhang, Xiaodan Liu, and Weiyan Hou, "Design and Implementation of Measurement Meter Reading System Based On
Wi-Fi," Automation & instrument, vol.25, pp. 18–21, June 2010.
[8] Marvell Technology_88W8686 Datasheet Rev D_February2007.
[9] Zhou Hongjin, and Xu Jiangning, "Developing Network Communication Model with Winsock," Computer Development &
Application, vol. 10, pp. 4-5, 2003.
[10] Zong Heng, Application of SQL using ODBC in VC++6.0,Journal of Qingdao University, vol.4, 2004.

Abstract:In this paper mainly focused on the design and implementation of new topology in a single phase five level cascaded H-bridge multilevel inverter by using only a five switches and two DC power source. The main objective of this paper is to increase number of levels with a low number of switches and sources at the output without adding any complexity to the power circuit. The main merit of the new topology is to reduce the lower total harmonic distortion, lower electromagnetic interference generation and high output voltage. In this paper, various carrier pulse width modulation techniques are proposed, which can minimize the total harmonic distortion and enhances the output voltages from proposed work of five level inverter. The various switching topologies of single-phase five level cascaded H-bridge multilevel inverters have been analyzed in this paper. It is justified that the new topology can be recommended to single phase five level Cascaded H-bridge inverter for better performance in comparison with conventional method. The simulation is done by Mat Lab 8.0 version software.
Keywords -cascaded H- bridge multilevel inverter, different phase pulse width modulation, low harmonics, MATLAB/Simulink software, reduced switches and sources.

[1] R. H. Baker and L. H. Bannister, "Electric Power Converter," U.S. Patent 3 867 643, Feb. 1975.
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Space Vector Modulation", International Journal on Electrical Engineering and Informatics - Volume 2, Number 2, 2010,pp 137- 149.
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Source", Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE,PP-426-430
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Engineering, Vol. 3, No. 6, December 2011, pp 789-794.
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Journal of Computer Applications (0975 – 8887) Volume 9– No.1, November 2010, pp-41-47.
[9] V. Dura Prasad ruddy and ruddy proof j.v.g.rama rao, " modeling , simulation of single phase multilevel inverter for different
loads by using various switiching topologies ", journal of energing trends in engineering and development issue 2 vol 4 (ma y
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[10] R. Seyezhai*, Banuparvathy Kalpana, Jennifer Vasanthi," Design and Development of Hybrid Multilevel Inverter employing Dual
Reference Modulation Technique for Fuel Cell Applications, International Journal of Power Electronics and Drive System
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Abstract:This paper presents an evolutionary computation (EC) method called Genetic Algorithm (GA) and a metaheuristic algorithm called Ant Colony Search Algorithm (ACSA) to solve the combined Economic and Emission dispatch (EED) problem with transmission losses. Economic Load Dispatch (ELD) and Economic Emission Dispatch (EED) have been applied to obtain optimal fuel cost and optimal emission of generating units, respectively. Combined Economic Emission Dispatch (CEED) problem is obtained by considering both the economy and emission objectives. A real coded GA has been implemented to minimize both the dispatch cost as well as emission while satisfying all the equality and inequality constraints. ACSA is also developed to provide a means of comparison and it is a new cooperative agents approach, which is inspired by the observation of the behaviors of real ant colonies on the topic of ant trail formation and foraging methods. In the ACSA, a set of cooperating agents called "ants" cooperates to find a good solution for economic dispatch problem. The merits of ACSA are parallel search and optimization capabilities. The feasibility of the proposed method is tested on a power system network and the experimental results of both GA and ACSA are compared with the solutions of conventional Lamda iteration method.
Keywords -Economic load dispatch, emission reduction, Ant Colony search algorithm, co – operating agents, Genetic algorithm, multi objective optimization.

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Techniques to Combined Economic Emission Dispatch with Line Flow Constraints‟, IEEE Transactions on power systems, Vol.18,
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[6] Thanathip Sum – im (2004), "Economic Dispatch by Ant Colony Search Algorithm‟, Proceedings of the IEEE Conference on
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Abstract:Crystals of Tungsten diselenide (WSe2) have been grown by direct vapour transport (DVT) technique using micro processor controlled dual zone horizontal furnace. The chemical composition and structure of grown crystals were confirmed using energy dispersive analysis of X-ray (EDAX) and X-ray diffraction (XRD). In the present investigation thermoelectric power measurements (TEP) have been carried out on the grown crystals. Different electrical transport parameters of semiconductors have been determined and discussed in the paper.
Keywords -WSe2, Structural, Electrical, EDAX, XRD.
PACS: 71.18+y, 71.20.-b, 71.20 Nr. , 73.90+F

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Abstract:A compact slotted patch antenna with single layer, single feed is simulated in this paper. By cutting two unequal slots at the upper right and lower left corner from the conventional microstrip patch antenna, resonant frequency has been reduced drastically compared to a conventional microstrip patch antenna and also simulated antenna size has been reduced by 34.22% with an increased frequency ratio.
Keywords -Bandwidth, Compact, Patch, Resonant frequency, Slot.

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