Voltage dip test procedure

The system described includes some other control elements in order to perform the voltage dip generation, which takes place as follows.

Having the by-pass switch (3) on allows the direct connection between the utility and the generating system (i.e. wind system), eliminating the effect of the insertion of the voltage dip generator.

Once this switch is open, the generator is connected to the grid through the series inductances (4), and the switch (6) connecting the parallel branch can be closed, in order to connect the primary of the transformer (7), which at this point is in no-load operation. Next, the dip generation switch (8) is closed, connecting the secondary of the transformer to the impedances (11) or to the short circuit (9) to achieve a deeper voltage dip. Timing the operation of these switches, the desired dip duration is set. As mentioned before, a 100% voltage dip can be achieved closing switches (5) and (9) after switch (3) has been open. The impedance banks (11) have single-phase switches (10) to have the possibility of performing single-phase, two-phase and three-phase tests.

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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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