28-11-2013 дата публикации
Номер: US20130313828A1
The invention relates to electromechanical assemblies comprising an alternator, especially of high power, typically greater than or equal to IMW, and a converter, the alternator comprising a rotor driven in rotation, by a wind turbine for example, and more particularly to wound rotor synchronous alternators. The drive can also take place by means of a tide-driven, hydraulic or marine-current-driven generator. An alternator comprises in a manner known per se a field winding, generally at the rotor, supplied with DC current either by split rings and brushes, or by an exciter, so as to generate in an armature winding, generally at the stator, an AC voltage. 1. Electromechanical assembly operating at variable regime , especially at variable speed , power or power factor , comprising:{'sub': f', 'S, 'a synchronous alternator, of power greater than or equal to 1 MW, with wound rotor, supplied with DC current through a voltage (V), especially by means of an exciter or of direct excitation by split rings and commutators, and delivering an output voltage (U),'}{'sub': S', 'f', 'S, 'a converter comprising a rectifier for rectifying the output voltage (U) of the alternator, the rectifier possibly being pulse width modulation- or diode-based and optionally followed by a DC/DC converter, the supply voltage (V) powering the wound rotor being slaved to the output voltage (U) of the alternator.'}2. Assembly according to claim 1 , further comprising a regulator configured to act on the voltage (V) to maintain the output voltage (U) of the alternator at a preset value (U).3. Assembly according to claim 2 , the reference voltage (U) being calculated so as to minimize at least one of the losses from the following list: iron losses claim 2 , losses by eddy currents claim 2 , losses by hysteresis claim 2 , losses through the Joule effect at the rotor claim 2 , losses through the Joule effect at the stator claim 2 , losses by conduction at the converter claim 2 , losses by switching at ...
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