Presentation on theme: "SINDHU.C.MANOHARAN Edited By Sarath S Nair"— Presentation transcript:
1SINDHU.C.MANOHARAN Edited By Sarath S Nair www.technologyfuturae.com MODELING OF THE WIND TURBINE WITH A PERMANENT MAGNET SYNCHRONOUS GENERATORSINDHU.C.MANOHARANEdited BySarath S Nair
2CONTENTS Introduction How does a wind turbine work Model of wind turbine with PMSGDifferent types of PMSGConstructional featuresModeling of generatorVoltage and torque equation Permanent Magnet Synchronous GeneratorControl schemes of a permanent magnet (PM) generatorAC-DC-AC Power Conversion SystemConclusion
3INTRODUCTIONWind energy is one of the best technologies available today to provide a sustainable supply to the world development.In terms of the generators for wind-power application, there are different types of wind turbine are there, fixed-speed wind turbines and variable speed wind turbineIn fixed speed wind turbine, induction generators are used (application in wind farms). But the limitations of such generators are low efficiency and poor power qualityIn variable speed wind turbine, doubly fed induction generators and permanent magnetic synchronous generators are used.
7RFPM machinesThe RFPM machine is producing the magnetic flux in the radial direction with PMs which are radial oriented. It is the best choice for direct drive wind turbineAFPM machinesThe AFPM machine is a machine producing magnetic flux in the axial direction with permanent magnets. (application in low speed low power range)TFPM machinesThe transverse flux (TF) principle means that the path of the magnetic flux is perpendicular to the direction of the rotor rotation.
8CONSTRUCTION OF PMSGStator is composed by teeth formed by silicon iron sheetsThese teeth are fixed by 2 bronze disks in their end.Skewing is provided to avoid cogging torque
10PERMANENT MAGNET SYNCHRONOUS GENERATOR Voltage for a PM generator in the d-q axis synchronous rotational reference frame can be expressed as
11GENERATOR MODELThe dynamic model of PMSG is derived from two phase synchronous reference frame ,in which q axis is 90 ahead of d axis with respect to the direction of rotation
12GENERATOR MODEL (cont’d) The electrical model of PMSG in the synchronous reference frame isRs =stator resistanceLd and Lq=inductance of the generator on d and q axisLld and Llq=leakage inductance of generator on d and q axisWe=electrical rotating speed(=Np Wg)
13GENERATOR MODEL (cont’d) Ld=Lds+ Lqs then equation becomesWe assume Ld=Lq=L then equation becomes
14GENERATOR MODEL (cont’d) ed=0eq=weApply in above equation we will get equivalent circuit as
15Which shows Torque can be regulated by current through q axis TORQUE EQUATIONAs the inductance of d and q axis are equal the torque can be expressed as follows…Which shows Torque can be regulated by current through q axis
16CONTROL STRATEGY OF WIND TURBINE Pitch control strategyYaw control
17DESIGN SPECIFICATION OF PMSG Rated power = 2MW;Rated wind speed = 12m/s;Resistance: Ra =.1Ohm;Inductance: L =0.005H;Gear ratio: ng =77;Number of pole pairs: np =2;Radius of wind turbine rotor: R=41m;Equivalent inertia: J=8000kg.m2;
18AC-DC-AC POWER CONVERSION SYSTEM The amplitude and frequency of the output voltage are not constant due to the variable speed and fixed excitation of the permanent magnets.3-phase diode rectifier is used for the AC/DC conversion.The SPWM (sinusoidal pulse width modulated) inverter with filter is adapted for the DC/AC power conversion.The PIC microcontroller combined with dedicated SA4828 chip is adopted to control of the SPWM inverter for a 20kW direct driven PM generator wind power generation system.
19SUMMARYThe complete model of the variable speed wind turbine with PMSG that is scheduled to connect AC grid is discussedThe design characteristics Constructional features of PMSG is discussedThe control strategy for AC/DC/AC power conversion of the PM generator are also discussed
20REFERENCE Magnet Synchronous Generator for Integration”  E. Muljadi, S. Drouilhet, R. Holz and V. Gevorgian, "Analysis of permanent magnet generator for wind power battery charging,“ IEEE-IAS Annual Meeting, vol.1 , Oct ,pp A. J. G. Westlake, J. R. Bumby, and E. Spooner, "Damping the power-angle oscillations of a permanent-magnet synchronous generator with particular reference to wind applications," IEE Proc.- Electr. Power Appl, Vol. 143, No. 3, May 1996, pp Ozdemir Gol’ and Bijan Sobhi-Najafabadi, “Use of Impedance Models in Permanent Magnet Synchronous Generator Design” Ming Yin, “Modeling of the Wind Turbine with a PermanentMagnet Synchronous Generator for Integration” Rogel R. Wallace,Thomas A. Lipo, Luis A. Moran,Juan A. Tapia:Design and Construction of a Permanent Magnet Axial Flux Synchronous Generatorin Proc. IEEE PESC’90, San Antonio, TX, USA, vol. 1, pp. 325~332, Jun
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