WIND POWER GENERATION TECHNOLOGY.pdf

II.DSCFS (Dual Speed Constant Frequency Scheme):-In this scheme a dual speed wind turbine is coupled to double windingInduction generator that is specially fabricated with 2 stator windings woundwith different number of poles P1& P2 (P1 > P2).When wind speed is low, winding with P1 poles gets connected and power isgenerated with grid frequency. Similarly, when wind speed is high, windingwith P2 poles gets connected and feed the power to grid at the samefrequency.It is Important to note that the difference in speed should be small. Reactivepower required by the Induction Generator can be supplied by installing theCapacitor bank.WindEnergyDual Speedwind turbineGear System/CoupleDoublewindingI.G.C. BankGridSystemYaw controllerControllerIII.VSCFS (Variable speed constant frequency scheme):-In this scheme output of three phase alternator (synchronous generator) isrectified by bridge rectifier. The DC output is transmitted through DCtransmission lines and then converted back to AC using synchronous invertersand fed to grid system.WindEnergyW TG / CAlternator3BridgeRectifier+-D.C.TransmissionSystemSynchronous(Commutated)inverterThis scheme, involving small wind generators is commonly used inautonomous applications such as street lighting. Due to variable speedoperation, it yields higher power for both low and high wind speeds. Bothhorizontal axis and vertical axis turbines are suitable.Togridsystem