Where XrXrXm2Xs

Consider that the grid-side converter of DFIG always operates at unity power factor, i.e. Qr= 0, the reactive power Qg is equal to the stator reactive power Qs, i.e. Qg=Qs. In the steady state analysis, in accordance with the expressions of stator power and the rotor power, it can be proved that Pr=-sPs, and Pg=Ps/(1-s). Accordingly, the real and reactive powers equations and the torque equation can be rewritten as

Xs ds X

2H- = Te - Tm = WdsIqs + WqsIds ) " Tm = "-fU^r ~ (25)

Finally, the equations (17-18), (21-22), (23-25) constitute the 3rd order simplified practical DFIG model.

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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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