Patent Number: 
Section: claims

1. Device (1) for generating voltage dips in an electrical power generator (2) with a control cabinet (4) at the output of the generator and an output transformer (3) to an electricity network (30) characterised in that it comprises:a) a circuit located between the control cabinet (4) of the machine and the output transformer (3) to the network (30) with a transformer (31), a plurality of impedances (11, 14, 17; 12, 15, 18; 13, 16, 19) in-series for each phase, having a first group of switches (24, 25, 26) associated respectively with each phase and a second group of switches (20, 21, 22) associated with the in-series impedances, and a switch (27) for connecting the circuit to ground;b) mechanisms for generating short circuits by activating the first group of switches (24, 25, 26) in order to select a single phase, two-phase or three-phase voltage dip, by activating the second group of switches (20, 21, 22) in order to select the depth of the voltage dip and by activating the third switch (27) in order to generate a short circuit to ground; andc) mechanisms for protecting the network (30) during voltage dip generation. 2. Device (1) for generating voltage dips in accordance with claim 1, characterised in that the mechanisms for protecting the network (30) comprise an inductor (23) to obtain a minimum level of disturbance to the network during voltage dip generation. 3. Device (1) for generating voltage dips in accordance with claim 1, characterised in that the electricity generation machine (2) is a wind turbine. 4. Device (1) for generating voltage dips in accordance with claim 3 characterised in that the power of the wind turbine (2) is between 850 kW and 2 MW. 5. Device (1) for generating voltage dips in accordance with claim 3 characterised in that it also includes bridging mechanisms enabling the wind turbine (2) to be directly connected to the network (30). 6. Device (1) for generating voltage dips in accordance with claim 3 characterised in that it also includes switching mechanisms for connecting/disconnecting it to/from the transformer (3).