By L. H. Hansen, L. Helle, F. Blaabjerg, E. Ritchie, S. Munk-Nielsen, H. Bindner, P. Srensen and B. Bak-Jensen
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Extra info for Conceptual survey of generators and power electronics for wind turbines Adgangsmade: Internet
To achieve full control of the grid current, the DC-link voltage must be boosted to a level higher than the amplitude of the grid line-line voltage. The power flow of the grid side converter is controlled in order to keep the DC-link voltage constant, while the control of the generator side is set to suit the magnetization demand and the reference speed. , 1996), (Yifan & Longya, 1992), (Yifan & Longya, 1995). Rectifier Inverter Grid Generator Figure 41. The back-to-back PWM-VSI converter topology.
The design process uses analysis of the simple basic pole-pair concept. e. geometric properties, the performance of the magnetic circuit may be predicted by using a numerical method such as FEM. After design and construction of the FEM model, it may be used to calculate the forces on a plane in the air gap. It must be remembered that the steady-state performance represents ideal conditions. Electric, magnetic and friction losses impair the performance of the real machine and should be taken 44 Risø-R-1205(EN) into account.
Further on, making a new production line also include huge investments. More research is also necessary in the classical solutions using power electronics. Especially, it is important to be able to predict the losses in order to keep a high reliability. Related to this it is also at interest to investigate gearboxes and drive train loads using variable speed. The mechanical stress may be reduced using variable speed. The doubly fed induction generator is now widely used but still research is needed in diagnosis, control and even more optimized design in order to reduce the losses to a minimum but also to reduce the overall prices of the generator system.