A power supply has first and second ac voltage generators. Both of the first and second ac voltage generators are connected to one or more loads and a respective 6-pulse rectifier unit for rectifying ac voltage from each of the first and second power generators to a dc voltage output for the loads, Both of the first and second ac voltage generators includes two 3-phase voltage sources separated by a phase shift. The voltage output from each rectifier unit is coupled to the loads via a respective interphase inductor.

A power supply has first and second ac voltage generators. Both of the first and second ac voltage generators are connected to one or more loads and a respective 6-pulse rectifier unit for rectifying ac voltage from each of the first and second power generators to a dc voltage output for the loads, Both of the first and second ac voltage generators includes two 3-phase voltage sources separated by a phase shift. The voltage output from each rectifier unit is coupled to the loads via a respective interphase inductor.

According to one or more embodiments, a method and system for electric power generation are provided. The embodiments include a permanent magnet generator (PMG), a rectification stage operably coupled to the PMG, a position sensor coupled to the PMG, and a controller operably coupled to the rectification stage. The controller includes a voltage regulator configured to receive a voltage reference and an output voltage of the system, and a current regulator in communication with the voltage regulator. The controller also includes a selective harmonic compensator comprising a current harmonic selector, wherein the selective harmonic compensator is configured to produce a compensation signal for a selected harmonic.

A method of synchronizing a cross-compound generator system on one or more turning gears during startup includes determining, via a notch monitor controller, first and second angular velocities, respectively, of a first and a second rotor. The method also includes simultaneously exciting, via the notch monitor controller, the first and second rotors to attain electromechanical coupling therebetween. The method further includes determining, via the notch monitor controller, a value of a time at which a calibration value of an offset is a constant value, where the offset is representative of a phase alignment of the first rotor relative to the second rotor, and where the offset is indicative of a successful electromechanical coupling therebetween. The method also includes disengaging the one or more turning gears from the cross-compound generator system.

An off-grid power generating apparatus is provided. The apparatus includes an engine, an alternator and an excitation control device. The alternator includes a rotor, a switch and a stator. The switch is movable between a first position and a second position. An output portion of the stator has first and second segments each of which has at least one coil. The first and second segments are operatively and separately connected with the switch. The first and second segments are connected in series at the first position and in parallel at the second position to provide a high voltage and a low voltage respectively. The excitation control device controls the output voltage to make it have a predetermined frequency, and to regulate the engine speed in response to the load power of the engine.

A system for variable speed drives using generators adjusting the motor frequency having a plurality of main generators 1, 2, 3 and 4 as the means of adjusting a plurality of AC motors frequency, a processor is provided that opens a main bus tie breaker in a power system to create two separate power systems, power source A and power source B, wherein power source a is powered by a generator 1 and a generator 2. and power source b is powered by a generator 3 and a generator 4, wherein the generators 1-4 are configured to operate on a droop curve wherein the output frequency of the generator is slightly reduced as the load increases.

A method for suppressing voltage overshoot at an output of a voltage regulator is disclosed. The voltage regulator includes at least one channel having a first set of (high-side) transistors and a second set of (low-side) transistors. In implementations of the method, an output voltage at an output of at least one channel of a voltage regulator is detected and compared with a reference voltage. A rate of change associated with the output voltage is also determined and compared with a threshold rate of change. When the output voltage is greater than the reference voltage and the rate of change is greater than the threshold rate of change, a resistance value associated with the second set of transistors is increased from a first resistance value to a second resistance value to prevent the output voltage from overshooting and/or to suppress an output voltage overshoot.

An off-grid power generating apparatus is provided. The apparatus includes an engine, an alternator and an excitation control device. The alternator includes a rotor, a switch and a stator. The switch is movable between a first position and a second position. An output portion of the stator has first and second segments each of which has at least one coil. The first and second segments are operatively and separately connected with the switch. The first and second segments are connected in series at the first position and in parallel at the second position to provide a high voltage and a low voltage respectively. The excitation control device controls the output voltage to make it have a predetermined frequency, and to regulate the engine speed in response to the load power of the engine.

A charging system for a vehicle includes an alternator configured to alternately output at least a low charge voltage to charge a low voltage storage device and a high charge voltage to charge a high voltage storage device, and a switch configured to switch between at least a first switch position connecting the alternator to the low voltage storage device and a second switch position connecting the alternator to the high voltage storage device. A controller is configured to control operation of the alternator and the switch between at least a low voltage mode and a high voltage mode based on at least one of an engine RPM and a temperature. In the low voltage mode the alternator outputs the low charge voltage and the switch is in the first switch position and in the high voltage mode the alternator outputs the high charge voltage and the switch is in the second switch position.

A method of synchronizing a cross-compound generator system on one or more turning gears during startup includes determining, via a notch monitor controller, first and second angular velocities, respectively, of a first and a second rotor. The method also includes simultaneously exciting, via the notch monitor controller, the first and second rotors to attain electromechanical coupling therebetween. The method further includes determining, via the notch monitor controller, a value of a time at which a calibration value of an offset is a constant value, where the offset is representative of a phase alignment of the first rotor relative to the second rotor, and where the offset is indicative of a successful electromechanical coupling therebetween. The method also includes disengaging the one or more turning gears from the cross-compound generator system.