Abstract: A system for generating an output power to a load is provided. The system comprises a generator configured for generating a variable frequency output power and a dual mode rectifier coupled to the generator and configured for being switched between a passive mode and an active mode. The dual mode rectifier comprises a passive rectifier coupled to output terminals of the generator and configured for operating in the passive mode and an active converter coupled to tappings from windings of the generator and configured for operating in the active mode.

Abstract: A power system for supplying power to a load is provided. The power system comprises a converter system comprising a first converter and a second converter and configured for operating in a first mode and a second mode. The first converter and the second converter are configured to be coupled in series during the first mode, and in parallel when operating in the fault mode.

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.