By Petersson Andreas

ISBN-10: 9172916001

ISBN-13: 9789172916005

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Identical results. In order to calculate the power in Fig. 3, derived using blade-element theory has been used used. , the influence of the turbulence is ignored. The interested reader can find information of the influence of the turbulence on the energy production in [69]. 1) where η is the gear-mesh losses constant and ξ is a friction constant. 005 are reasonable. In Fig. 2 the gearbox losses are shown for the investigated systems. 1. For the DFIG system, the voltage drop across the slip rings has been neglected.

1 has been used. Now, the total losses from the three transistor legs of the converter become Ploss = 3(Pc + Ps,T + Ps,D ) = 3 (VIGBT + Vsw,T √ 2 2 2 . 7) The back-to-back converter can be seen as two converters which are connected together: the machine-side converter (MSC) and the grid-side converter (GSC). For the MSC, the current through the valves, Irms , is the stator current for the VSIG system or the rotor current for the DFIG system. One way of calculating Irms for the GSC is by using the active current that is produced by the machine, adjusted with the ratio between machine-side voltage and the grid voltage.

7 the equivalent circuit of the grid filter in stator coordinates can be seen. The filter consists of an inductance Lf and its resistance Rf . Applying Kirchhoffs voltage law to the + Rf Lf isf + Esg vfs − − Fig. 7. Grid-filter model in stator coordinates. 44) where Eg is the grid voltage, if is the grid-filter current, and vf is the grid-filter voltage supplied from the grid-side converter. 43 Harmonics The transfer function, Gf (p), of the grid filter can be expressed as isf (p) 1 . 45) This means that the damping of the grid filter is given by 1 |Gf (jω)| = L2f ω 2 + Rf2 .

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Analysis, modeling and control of doubly-fed induction generators for wind turbines by Petersson Andreas

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