Active and reactive powers and currents formulations applied to wind farms

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Figure 1 schematically shows the equivalent circuit of a wind generator connected to the grid (represented by a delta-connected load). Phases of the wind generator are star-connected and there is no neutral wire. Active and reactive phenomena in these power systems do not depend on the zero-sequence voltages and, thus, any artificial ground can be chosen to measure phase voltages at the point of common coupling (PCC).

Figure 1 schematically shows the equivalent circuit of a wind generator connected to the grid (represented by a delta-connected load). Phases of the wind generator are star-connected and there is no neutral wire. Active and reactive phenomena in these power systems do not depend on the zero-sequence voltages and, thus, any artificial ground can be chosen to measure phase voltages at the point of common coupling (PCC).

Fig. 1. Equivalent circuit of a wind generator connected to the grid

Active and reactive phenomena in that power system are analyzed and their characteristic quantities are formulated in this section using the Unified Theory (León et al., 2001). Traditional active and reactive powers included in the IEEE Standard 1459-2010 will be expressed at last of this section in order to compare the results obtained with these mentioned approaches applied on data registered in actual wind farms, in other sections.

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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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