Uqr RrIqr29

In this chapter, two special PI controllers are designed to implement the decoupled control of the real and reactive power outputs of DFIG. The block diagrams of rotor-side converter including the inner and outer control loops expressed in d and q axes are given in Fig.4 and Fig.5. In the rotor current control loop, Tr'=Xr'/R, Tr' is the time constant of rotor circuit; Idrref, Iqrref are the rotor current references in d and q axes, respectively; K2 and T2 are the control parameters of PI controller. In the power control loop, Psref, Qsref are the real and reactive power references; Kl, Tl are the control parameters of PI controller. It should be noted that the specific values of Kl, Tj, K2 and T2 can be determined through pole placement method (Tapia et al., 2006).

In accordance with Fig. 4, the corresponding stator real power control model can be described as fW - KT (^ - ^) = K1 (Ps - Psref) (30)

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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