Assembly operating in a variable regime
AssigneeMoteurs Leroy-Somer
InventorsLuc Moreau, Pierre Rigaud, Thomas Verchere
Life of this patent
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Abstract
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.
Claims16
Electromechanical assembly operating at variable regime, especially at variable speed, power or power factor, comprising:
- a synchronous alternator with a wound rotor, supplied with DC current through a voltage (Vf), and delivering an output voltage (US);
- a converter comprising a rectifier for rectifying the output voltage (US) of the alternator, the supply voltage (Vf) powering the wound rotor being slaved to the output voltage (US) of the alternator;
- a regulator configured to act on the voltage (Vf) to maintain the output voltage (US) of the alternator at a reference voltage (Us eff ref);
- and
- the reference voltage (Us eff ref) being calculated so as to minimize at least one of the losses selected from the group consisting of iron losses, losses by eddy currents, losses by hysteresis, losses through the Joule effect at the rotor, losses through the Joule effect at the stator, losses by conduction at the converter, and losses by switching at the converter, wherein for rotation speeds below a nominal speed, the output voltage (Us) is less than a regulating voltage within the framework of a regulation with constant Us/f over the whole of the range of speeds up to the nominal speed, where f is the frequency.
A method for transforming mechanical energy, into electrical energy, the method comprising:
- operating an assembly, the assembly comprising:
- a synchronous alternator with a wound rotor, supplied with DC current through a voltage (Vf), and delivering an output voltage (US);
- a converter comprising a rectifier for rectifying the output voltage (US) of the alternator, the supply voltage (Vf) powering the wound rotor being slaved to the output voltage (US) of the alternator to maintain the output voltage US at a reference voltage (Us eff ref) being calculated so as to minimize at least one of the losses selected from the group consisting of iron losses, losses by eddy currents, losses by hysteresis, losses through the Joule effect at the rotor, losses through the Joule effect at the stator, losses by conduction at the converter, and losses by switching at the converter, wherein for rotation speeds below a nominal speed, the output voltage (Us) is less than a regulating voltage within the framework of a regulation with constant Us/f over the whole of the range of speeds up to the nominal speed, where f is the frequency;
- wherein the rotor of a synchronous alternator with a wound rotor is supplied with DC current at a voltage (Vf) slaved to an output voltage (US) of the alternator.
Dependencies are inferred from the claim text.