iosr-JEEE   Volume-7 ~ Issue-3

Abstract: Harmonics are multiples of the fundamental frequency of power system. These harmonics are creating distorted voltages and currents in the power system. Distortion of voltages and currents can affect the power quality. This article covers Harmonics sources in power system. Different Sources of harmonics in power system have been discussed.

Keywords: Current, Distortion, Frequency, Harmonics, Power System, Source, Voltage

[1] C. Francisco and R. DeLa, "Harmonics and Power Systems", CRC Press Taylor & Francis Group, LLC, 2006
[2] K. D. Patil and W. Z. Gandhare, "Effects of Harmonics in Distribution Systems on Temperature Rise and Life of XLPE Power Cables", Power and Energy Systems (ICPS), pp. 1 - 6, Chennai, 22-24 December 2011
[3] J. Arrillaga, D. A. Bradley and P.S. Bodger, "Power System Harmonics", John Wiley & Sons, New York, 1985
[4] R. D. Henderson and P. J. Rose, "Harmonics: The Effects on Power Quality and Transformers", Industry Applications, IEEE Transactions, Vol. 30 , Issue: 3, pp. 528 - 532 , May/June 1994
[5] M. Rashid, "Power Electronics: Circuits, Devices, and Applications", 3rd Edition, Prentice Hall New Jersey, USA, 2004
[6] Variable Frequency Drive by Carrier Corporation Syracuse, New York, October 2005

Abstract: The output power of the present wind turbine is continuously increasing. Due to this Double fed Induction generators are gaining more attention especially in the field of wind power generation due to many advantages and rapid development in both power electronics and control strategies. Vector Control of doubly fed induction generator for variable speed wind power generation is used widely now days. The Control scheme used is stator flux oriented control for rotor side converter control and grid voltage vector control for grid side converter control for the control of active and reactive powers of the DFIG under variable speed operation. The scheme implemented uses Conventional PI controllers as well as Fuzzy logic controllers for the rotor side converter control to control active and reactive power and optimize the power generation from the DFIG. Here the design of a doubly fed induction generator (DFIG), using back-to-back PWM converters in the rotor circuit has been described. A vector-control scheme results in independent control of active and reactive powers, while ensuring sinusoidal supply currents. The scheme provides a wide speed-range operation from sub synchronous to super-synchronous modes.

Index Terms: windpower generation, fuzzylogic, DFIG

[1] Variable structure control of active and reactive power of DFIG in wind turbine,DONGYOUNGCHWA and KYO-BEUM-IEEE-2010
[2] Decoupled active and reactive power control of DFIGA.DENDUOGA,R.ABDESSEMED,M.L.BENDAAS,A.CHAIBA-2010-MEDITERRANEAN CONFERENCE
[3] Active and Reactive power control of DFIG using SVPWM converter AHMADI, H.LIVANI,H.KIRMANI-NOSHIRVANI-2009
[4] Modelling and control of wind turbine driven DFIG, A.TAPIA,G.TAPIA IEEE-2003 edition
[5] Power electronics and AC drives by BIMAL.K.BOSE Pearson edition -2002
[6] A Novel approach of direct active and reactive power control allowing the connection of the DFIG of the grid-JEBALI-BEGHOR BAMANEL,ARBIJIHEN SALMAN-BELKHODIA ILEM-2011

Abstract: Different electric wind power conversion systems structures can be used based on the converters topologies. A Wind Energy Conversion System (WECS) differs from a conventional power system. The power output of a conventional power plant can be controlled whereas the power output of a WECS depends on the wind. This nature of WECS makes it difficult for analysis, design and management. Various approaches have been developed to study the behavior of WECS. In this paper, the steady state characteristics of a WECS using doubly fed induction generator (DFIG) is analysed using MATLAB. The dynamic steady-state simulation model of the DFIG is developed using MATLAB. Simulation analysis is performed to investigate a variety of DFIG characteristics, including torque-speed, real and reactive-power over speed characteristics. Based on the analysis, the DFIG operating characteristics are studied. Keywords: Wind Energy Conversion System (WECS), Doubly Fed Induction Generator (DFIG), Simulation, MATLAB

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