Abstract: The electronic generator power PG is compared with a predetermined power range in order to set the torque of the synchronous generator of a wind energy installation. A choice between two control modes is made on the basis of the comparison, and a reference power PG* is determined that corresponds to the maximum power production. This reference power PG* is compared with the electrical generator power PG, and a reference current IE* that is proportional to the power difference is produced and supplied to the field controller. The field controller draws power in a controlled manner from the capacitive DC voltage intermediate circuit as a function of the reference current IE*, and supplies this power to the excitation field. Changing the excitation field results in a change in the torque and hence in the rotational speed of the synchronous generator, which enables the two power values to be matched.

Abstract: A high-voltage DC/DC converter is described. The high-voltage DC/DC converter contains a number of primary-side converter modules and at least one secondary-side converter module. The DC connections of the primary-side converter modules are connected in series between the connections of a high-voltage DC distribution network. The DC connections of the secondary-side converter modules are connected in parallel between the connections of a further DC network. Each of the primary-side converter modules contains a primary-side converter bridge, a primary-side capacitor, a primary-side series resonant capacitor, a transformer and a secondary-side series resonant capacitor. The secondary-side converter module contains a secondary-side converter bridge and a secondary-side capacitor.

Abstract: A high-voltage DC/DC converter is described. The high-voltage DC/DC converter contains a number of primary-side converter modules and at least one secondary-side converter module. The DC connections of the primary-side converter modules are connected in series between the connections of a high-voltage DC distribution network. The DC connections of the secondary-side converter modules are connected in parallel between the connections of a further DC network. Each of the primary-side converter modules contains a primary-side converter bridge, a primary-side capacitor, a primary-side series resonant capacitor, a transformer and a secondary-side series resonant capacitor. The secondary-side converter module contains a secondary-side converter bridge and a secondary-side capacitor.