By Petersson Andreas
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Additional info for Analysis, modeling and control of doubly-fed induction generators for wind turbines
This means that the increased aerodynamic capture that can be achieved by a larger converter has, thus, a greater impact than the increased converter losses. Worth stressing is that the main reason for using a variable-speed turbine instead of a fixed-speed turbine is not the energy efficiency, instead it is the possibility of lowering the mechanical stresses  and also improving the power quality . 1 Introduction In this section, different aspects of designing and implementing control systems for doublyfed induction generators (DFIGs) are treated.
However, it is also possible to align the synchronous coordinate system with, for example, the grid voltage. Space vectors in synchronous coordinates will be dc quantities in the steady state. 2 Power and Reactive Power in Terms of Space Vectors The instantaneous power, P , in a three-phase system is given by 3 3 P = v a ia + v b ib + v c ic = Re [vs (is )∗ ] = Re [vi∗ ] . e. K = 1/ 2, yields P = 3Re [vi∗ ] . , the same as active power in terms of phasors. It is also possible to define a quantity the instantaneous reactive power, Q, as the corresponding imaginary part of the above equation : Q = 3Im [vi∗ ] .
In , a lower fixed-speed IG WT efficiency was reported than in this study. The reason for this is that the IG in this study has two generators and lower iron losses. 4 Discussion In Fig. 12 it can be seen that the two-generator system (FSIG 2), the DFIG system, and the PMSG system have almost the same efficiency. In  it was found that the DFIG system produced 60% more energy compared to a fixed-speed system. However, in this study the produced energy of the systems was found to be similar.