Abstract
In this chapter, the model of a wind turbine considering the blades, gearbox, and a doubly fed generator is presented. The aerodynamic model for the blades considers the structural forces applied in the blade, in order to calculate the output torque. This output torque is used as the input of the next stage, and is transmitted by the main shaft and bearing to the gearbox. For the gearbox part, the model used here is based on a planetary gear. The use of the gearbox stage in the model is because most of the installed wind turbines have kept this configuration. The variable-speed wind turbine with doubly fed generator configuration is considered. This configuration has some important advantages, e.g., the losses in the power electronics converter (using for their control) are reduced, as compared to a direct-driver synchronous generator configuration, the stress of the mechanical structure is reduced, and the possibility of controlling the reactive power. The complete system behavior is effectively analyzed through simulations. In order to do this, real data provided in the open literature for a 750 kW wind turbine are considered in the model; with its control system taken into account. Moreover, the control of the electrical energy is the fundamental part of a wind turbine. In this context, as mentioned before, the doubly fed induction generator (DFIG) offers an economical benefit to different variable-speed wind turbines configurations. The stator is directly connected to the power network, while the rotor is connected through slip rings to a power electronic converter. The main advantage of this configuration is the fact that the power electronic converter has to handle only a fraction (30 %) of the total power. Therefore, the losses in the power electronic converter can be reduced. The doubly fed induction generator model used in this chapter is based on the Park reference framework. This allows obtaining the inverse model in a simplified manner. Two power electronics converters, machine side converter (MSC) and network side converter (NSC), respectively, are used to build a DC-link between them, thus allowing the power transfer. With the MSC, it is possible to control the torque or speed in the DFIG and the power factor at the stator terminals, while with the NSC functions the DC-link voltage is kept constant. Then, the control laws for the MSC and NSC are presented in this chapter. The control laws applied to the doubly fed induction generator are derived from the inverse model, using the bicausality concepts. The inverse bond graph is used in order to obtain the mathematical expression to control the torque and the active power delivered by the generator. The robustness of the proposed control applied to the wind turbine model is verified for constant and variable wind speed operation conditions.
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Abbreviations
- DFIG:
-
Doubly fed induction generator
- MSC:
-
Machine side converter
- NSC:
-
Network side converter
- DC:
-
Direct current
- Cp:
-
Power coefficient
- BEM:
-
Blade element momentum
- DFIM:
-
Doubly fed induction motor
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Sánchez, R.T., Rios, A.M. (2017). Modeling and Control of a Wind Turbine. In: Borutzky, W. (eds) Bond Graphs for Modelling, Control and Fault Diagnosis of Engineering Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-47434-2_15
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