Abstract: A method is provided for operating an electric energy production facility during a fault in a utility grid to which energy is to be delivered. The energy production facility includes at least one wind turbine. The method includes disconnecting the utility grid from the wind turbine. The method further includes connecting an external generator via a cable to an auxiliary equipment of the wind turbine, to deliver active power to the auxiliary equipment. The cable is connected to a converter of the wind turbine the converter supporting reactive power. A corresponding arrangement also provided.

Abstract: An electrical power system may comprise a main generator with a rotor having field windings and at least one embedded permanent magnet. A generator control unit (GCU) may be connected to receive excitation current produced by the main generator with flux from the at least one permanent magnet. An exciter generator may be connected to be provided with excitation from the GCU. The exciter generator may provide excitation current to the field windings of the main generator. The main generator may produce output current from flux from the field windings and the at least one permanent magnet.

Abstract: A controlled frequency generating system (CFG) may be constructed with a main generator and an exciter driven by a common shaft. Excitation power may be provided from the common shaft; as distinct from prior-art systems which may require independent excitation power sources. While controlling the output voltage and frequency of the main generator, the bi-directional controller extracts power from a main generator output and may supply the extracted power to supplement excitation power when needed at certain rotational speeds. The controller may extract power from the exciter when, at other rotational speeds, the exciter produces excess power. The extracted excess power may be delivered to the output of the main generator to maintain a desired level of output power at a desired frequency, irrespective of speed of rotation of the CFG.

Abstract: A circuit and a method for controlling excitation current to the field winding of a generator or motor. An uncontrolled current source supplies sufficient excitation current to maintain the generator output voltage at a level slightly below the seated voltage when no load is present. A controlled current source compensates for generator loading to supply additional excitation current sufficient to raise the output voltage to approximately the rated voltage.

Abstract: A series-exciting device for a synchronous generator characterized in that armature windings at the side of the armature are wound using concentrated full-pitch winding or a winding method similar to the concentrated full-pitch winding; an exciting winding which is magnetically coupled to magnetic poles in a quantity odd times greater than the quantity of the poles of the said armature windings, and a rectifier which converts the electromotive force of the exciting winding into a DC are provided at the side of the field system; and a DC output terminal of the rectifier is connected to a field winding having poles in the same quantity as the quantity of the poles of the said armature windings.

Abstract: The invention relates to an on board power supply, particularily for a ship propelled by a variable speed diesel engine (1), comprising a first alternator (2) coupled to a diesel engine, an electronic regulator (4) for the first alternator, a rectifier (5) for rectifying the output current of the first alternator, a direct current motor (6) powered from the output of the rectifier, and a second alternator (8) coupled to the direct current motor.It also comprises means (13) for selectively feeding the regulator of the first alternator from the output (12) of the first alternator or from the output (11) of the second alternator.

Abstract: An excitation system for a brushless synchronous alternator includes an exciter having a stator which includes first and second sets of field coils respectively coupled to a source of DC power and in series with polyphase AC output current developed by the main generator. A base level of exciter field current is provided by the DC current delivered to the first set of field coils while a second variable amount of field current is provided by the AC output current delivered to the second set of field coils. The exciter also includes a rotor structure having first and second sets of armature windings which develop first and second exciter currents in response to movement of the rotor structure within the magnetic fields set up by the first and second sets of exciter field coils. The first and second exciter currents are added, rectified and delivered to a set of main generator field windings.

Abstract: For a dynamoelectric machine, excitation power is supplied by a main exciter having two field windings. A first field winding is driven by a pilot exciter which supplies base excitation (small signal) for the main exciter. Forcing excitation (large signal) is supplied by the second field winding which is driven by an external, supplemental power source. The main exciter can thus provide the appropriate excitation for both normal and transient operating conditions. In addition, by switching the controlled rectifier elements associated with the supplemental power source, the second field winding is also capable of providing fast de-excitation for the main exciter.

Abstract: A combination exciter/permanent magnet generator for a brushless generator system features a permanent magnet generator wound directly on the exciter structure, while allowing the permanent magnet generator and exciter to be functionally independent of each other. The arrangement is such that the permanent magnet generator provides sufficient voltage under a wide range of speed, load and temperature conditions to turn on power transistors included in a voltage regulator associated with the generator system and to insure adequate system self build-up to a required output voltage without increasing the size of the system as would otherwise be the case.

Abstract: The specification discloses an improved motor vehicle alternator adapted to be coupled to a regenerative feed-back system. The stator of the alternator has fourteen coils per phase, each coil having three turns. The wire is 13 A.W.G. electrically conductive. The feed-back system has the output of the multi-phase alternator coupled to its rotary field to self-excite the alternator when current is drawn from the output by a welding unit or other type of load. A DC power supply is employed normally to excite the rotary field during no load conditions.

Abstract: A generator has a stator which is provided with a multipole main winding and with an auxiliary winding, which is separate from and has the same number of poles as said main winding and a coil width not in excess of one-half of the pole pitch of said main winding. An exciter has a field-exciting winding. A controller is connected between said auxiliary winding and said field-exciting winding to energize the latter.

Abstract: An automatic voltage regulating system in a brushless generator comprising a permanent magnet provided on the stator side of a main generator and constituting a field system of an exciter generator portion, an exciter generating coil provided on the rotor side of the main generator, rectifier for rectifying a voltage induced in the exciter generating coil, a field coil of the main generator excited by the output of the rectifier and provided on the rotor side, and an armature coil of the main generator provided on the stator side, and characterized in that the permanent magnet and a control coil are provided on the exciter field system, and an automatic voltage regulating portion which detects the output voltage of the main generator and supplies the control coil with a controlling current is provided so that fluctuations of the output voltage of the main generator can be absorbed by the control coil.