An uninterruptible power supply system has a regulated power source, an electrical generator electrically interconnected to the regulated power source, an engine having a main shaft integral with or coupled to the shaft of the electrical generator, a rotating rectifier mounted onto a shaft of the electrical generator, a mains power supply, a switch connected between the electrical generator, the mains power supply and a synchronous machine of the regulated power source, a synchronous generator, and an uninterruptible load. The regulated power source has a housing, a synchronous machine, a synchronous generator, and a flywheel sharing a common shaft. The electrical generator has a shaft coupled to a combustion engine. The switch transfers power from the synchronous machine to the electrical generator to cause the electrical generator to rotate its shaft or the main shaft of the engine. A short-stop load is supplied power from the electrical generator.

The invention related to a control method for operating a synchronous machine, the machine comprising an exciter connected to a synchronous generator and a controller (40) for controlling the machine field excitation. The method comprises the steps of predefining a stable operation torque derivative range within which a stable operation of the machine occurs, performing a torque measuring or calculating for the machine, calculating the derivative of said torque, determining whether the calculated torque derivative is within the predefined stable operation torque derivative range for the machine, and, if the torque derivative is not within the predefined stable operation torque derivative range, modifying the machine field excitation to bring the torque derivative within the predefined stable operation torque derivative range.

A method of performing de-excitation of a brushless synchronous machine having a stator; and a rotor including: a field winding, an exciter armature, a rectifier having thyristors, the rectifier having input terminals connected to the exciter armature and output terminals connected to the field winding, a field discharge resistor connected in series with the field winding, and a bypass switch connected in parallel with the field discharge resistor, the bypass switch being operable between a closed state in which the field discharge resistor is bypassed, and an open state, wherein the method including: a) controlling the thyristors to fire only during a negative half-cycle of the armature voltage waveforms, and b) controlling the bypass switch to obtain the open state from the closed state to thereby discharge a field winding current through the field discharge resistor.

A motion-state dependent method for operating a kinetic generator on a marine vessels or platform includes determining a motion state of the marine vessels or platform, and imposing a limit on at least one of charging and discharging of the kinetic generator based upon the motion state to keep the kinetic generator within a safe operating range.

The invention relates to a method for feeding electrical power into an electrical supply grid. The method includes rectifying a first AC voltage of an electrical power, produced by a generator, into a first DC voltage and increasing the first DC voltage to a second DC voltage such that the second DC voltage has a step-up ratio in relation to the first DC voltage. Alternatively, the method includes rectifying the first AC voltage into the second DC voltage without producing the first DC voltage. The method includes inverting the second DC voltage into a second AC voltage for feeding electrical power into the electrical supply grid depending on an feed setpoint value and setting the second DC voltage depending on the feed setpoint value and actual value. The second DC voltage is increased depending on an increase in the feed setpoint voltage or actual value.

Provided is a driving system and method for a wound rotor synchronous generator. The driving system for a wound rotor synchronous generator according to the present invention includes: a converter controlling the wound rotor synchronous generator and receiving generated power; and a field winding power supply means supplying the power to a field winding of a rotor of the generator. The field winding power supply means is connected to the converter to receive the power from the converter and supply the power to the field winding, the power supplied to the field winding being electrically insulated from the power received from the converter.

Provided is a driving system and method for a wound rotor synchronous generator. The driving system for a wound rotor synchronous generator according to the present invention includes: a converter controlling the wound rotor synchronous generator and receiving generated power; and a field winding power supply means supplying the power to a field winding of a rotor of the generator. The field winding power supply means is connected to the converter to receive the power from the converter and supply the power to the field winding, the power supplied to the field winding being electrically insulated from the power received from the converter.

A turboelectric generator system includes a gas turbine engine which includes, in fluid flow series, a gas-generator compressor, a combustor, a gas-generator turbine, and a variable-speed free power turbine. The system further comprises a variable-frequency electric machine rotatably connected with the free power turbine and a power converter configured to convert a variable frequency electrical output from the electric machine to a fixed frequency output.

A generator set for generating an alternating current, includes a primary power unit, an alternating current generator, and a secondary power unit. The alternating current generator is rotationally coupled to the primary power unit, and converts power provided by the primary power unit into an electric power. The secondary power unit is connectable to the alternating current generator so as to increase the power generated by the alternating current generator.

The invention relates to a method for detecting an error in a generator unit which has an electric machine (100) with a rotor winding (110), a stator winding (120), and a rectifier (130) connected thereto, via which the electric machine (100) is connected to an onboard electrical system (150) of a motor vehicle, wherein a voltage of the onboard electrical system (150) is controlled to a target value via an excitation current (I.sub.E) through the rotor winding (110) of the electric machine (100), and a curve of a phase voltage (U.sub.y) of the stator winding (120) is monitored, wherein an error in the generator unit is inferred when a change of the phase voltage (U.sub.y) is detected and a voltage of the onboard electrical system (150) changing within a threshold value range (S) is detected.