viii LIST OF ILLUSTRATIONS Page Figure 1.1 Annual and cumulative growth in US wind power capacity ............................. 1 Figure 1.2 Wind power projections ................................................................................... 2 Figure 1.3 Wind turbine power characteristics for 0* pitch angle ..................................... 3 Figure 2.1 Variation of power with respect to the pitch angle and wind turbine speed .. 10 Figure 2.2 Double fed induction generator schematic ...................................................... 11 Figure 2.3 Steady state T-equivalent circuit of DFIG....................................................... 12 Figure 2.4 Two port equivalent circuit of DFIG. .............................................................. 15 Figure 2.5 Three limitations of a DFIG model ................................................................ 21 Figure 3.1 Wind turbine power characteristics ................................................................. 25 Figure 3.2 SIMULINK Wind Turbine model. .................................................................. 25 Figure 3.3 Grid side controller ......................................................................................... 26 Figure 3.4. Grid side converter ......................................................................................... 27 Figure 3.5 Rotor side controller. ....................................................................................... 29 Figure 3.6 SIMULINK model of the rotor side controller ................................................ 30
Figure 4.1 Frequency relaxation limits ............................................................................. 32
Figure 4.2 Droop characteristics for Unit, 1 & 2 ............................................................. 35
Figure 4.3 Flowchart for hysteresis control for WPP ....................................................... 36
Figure 4.5 Voltage droop for WPP ................................................................................... 38
Figure 5.1 One line diagram for the test system. ............................................................. 40
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