Voltage dip generator

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Voltage dip generators are based on the use of two impedances, as it is shown in Fig. 12 (Niiranen, 2005, 2006; Gamesa eolica, 2006; Gamesa innovation and technology, 2006). The parallel impedance enables the generation of the fault while the series impedance immunizes the grid from the dip and the test can be performed without affecting other systems connected to it.

Fig. 12. Dip generator scheme and its position with respect to the windmill and the wind farm. 5.1.1 20 kV 5 MW Voltage dip generator

This section describes the design of a 20 kV, 5 MW voltage dip generator. It is installed in a trailer, so it is able to move to the wind turbine location (García-Gracia et al, 2009).

Voltage dip generator

Fig. 12. Dip generator scheme and its position with respect to the windmill and the wind farm. 5.1.1 20 kV 5 MW Voltage dip generator

This section describes the design of a 20 kV, 5 MW voltage dip generator. It is installed in a trailer, so it is able to move to the wind turbine location (García-Gracia et al, 2009).

Fig. 14 shows a scheme of this voltage dip generator. It is based on an inductive divider comprised of a series and a parallel branch, and its main components are a three-phase series impedance (4) at the system input, a parallel tap transformer (7) and a three-phase impedance (11) grounded through a control switch in the secondary of the transformer. This impedance allows the adjustment of the dip depth to the desired value, along with the regulation of the transformer, because the impedance (11) connected to winding 2 is referred to winding 1 by multiplying by the square of the turns ratio. Switches (5) and (9) make possible the generation of a 100% depth voltage dip.

Fig. 14 shows a scheme of this voltage dip generator. It is based on an inductive divider comprised of a series and a parallel branch, and its main components are a three-phase series impedance (4) at the system input, a parallel tap transformer (7) and a three-phase impedance (11) grounded through a control switch in the secondary of the transformer. This impedance allows the adjustment of the dip depth to the desired value, along with the regulation of the transformer, because the impedance (11) connected to winding 2 is referred to winding 1 by multiplying by the square of the turns ratio. Switches (5) and (9) make possible the generation of a 100% depth voltage dip.

Fig. 13. Picture of the 5 MW test system.

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Fig. 14. Scheme of the voltage dip generator.

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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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