An example electrical power system includes a DC bus connected to a load, a plurality of generators driven by rotation of a common shaft, and a plurality of power converters. Each power converter includes an active rectifier controller that operates a respective active rectifier to rectify AC from a respective one of the generators to DC on the DC bus. A load sharing controller is operable to provide a respective adjustment signal to each respective power converter that is enabled, the respective adjustment signals based on a difference between an average output current across all of the active rectifiers that are enabled, and a particular output current of the respective power converter. Each active rectifier controller is operable to determine a quadrature current value for its associated generator based on its adjustment signal.

A mid-engine extended range electric vehicle includes a vehicle body, a turbo shaft engine, a battery pack, an electric generator, a vehicle control unit, drive motors, a gas controller, a battery controller, a gas storage tank and an intake box. Wherein the vehicle body includes a main body, bottom structure thereof forms frames of the vehicle; the engine is arranged on the frames between front and rear axles and near to the rear axle; an output shaft axis of the engine is located on a symmetry plane of the vehicle body, and an air inlet thereof faces tail of the vehicle; the intake box is communicated with the air inlet and is communicated with intake grilles on a covering piece of the vehicle body via pipelines. The vehicle has features of high effective energy conversion, good operating performance, long endurance mileage and high strength body.

A propulsion system for an unmanned underwater vehicle includes a turbine engine having a rotational output, an electrical generator mechanically connected to the rotational output and electrically connected to an Alternating Current (AC) power bus. A magnitude of an AC output of the electrical generator is independent of rotational speed of the rotational input. An electrical motor connected to the AC power bus, and includes a mechanical output.

An ECU performs a controlling process including: switching a main converter to a boost converter CNV2 when a boost converter CNV1 is set as a main converter and when a first stress value Va is greater than a second stress value Vb; switching a sub converter to the boost converter CNV1; switching the main converter to the boost converter CNV1 when the boost converter CNV1 is not set as a main converter, and when the second stress value Vb is greater than the first stress value Va; and switching the sub converter to the boost converter CNV2.

A primary circuit and a secondary circuit each have a switching element, each operate as a power conversion circuit while the switching element is activated, and each operate as a rectifier circuit while the switching element is deactivated. While a generator provided at the primary side of a first power conversion device is stopped, a controller activates the switching element of the secondary circuit and deactivates the switching element of the primary circuit. Accordingly, the first power conversion device converts electric power input from the secondary side and supplies electric power for causing the generator to operate. While the generator is operated, the controller activates the switching element of the primary circuit and deactivates the switching element of the secondary circuit such that the first power conversion device converts electric power supplied from the generator and outputs the converted electric power to the secondary side.

A series hybrid drive unit that is downsized while improving power transmission efficiency. In the series hybrid drive unit, a generator is driven by an engine, and a motor is operated by electricity generated by the generator. Torque generated by the generator is delivered to drive wheels through a final reduction unit. An input member that is rotated by a torque of the engine, and that is arranged parallel to a rotational center axis Og of the generator. The generator and the motor are arranged parallel to each other while keeping a predetermined clearance, and the final reduction unit is arranged parallel to the motor. The input member and the generator are connected through a first wrapping transmission mechanism, and torque of the motor is transmitted to a final reduction unit through a second wrapping transmission mechanism.

A braking system for a vehicle includes an electric drive system associated with a first set of wheels. The electric drive system is configured to selectively provide electric motive power to the first set of wheels of the vehicle to propel the vehicle and electric retarding to slow the vehicle. The system further includes a friction brake system associated with a second set of wheels of the vehicle, and a controller for selectively actuating the electric drive system to operate in an electric retarding mode and for selectively actuating the friction brake system. The controller is configured to transfer retarding force from the first set of wheels to the second set of wheels, and/or to determine wheel speed signal accuracies, in either case to mitigate vehicle/wheel sliding or slipping.

A vehicle power system may include a gate driver configured to drive a traction gate and a generator gate corresponding to switches of a variable voltage controller such that the gates have alternating pulse width modulation ON periods. The gates may be driven in response to a throughput magnitude falling below a threshold. The gate driver may be further configured to drive the gates such that a duty cycle of one of the gates is zero in response to the throughput exceeding the threshold.

A power converter (10) for operating a first electric machine (12) and a second electric machine (14), comprising:

a first converter element (16), a second converter element (18) and a first terminal connection (21), a second terminal connection (22) and a third terminal connection (23) for connecting the power converter (10) to a three-phase energy supply (60), wherein
the first converter element (16) comprises a first rectifier circuit (31) and a second rectifier circuit (32), the second converter element (18) comprises a third rectifier circuit (33), wherein
the first rectifier circuit (31) has a first AC-side pole (51) and a second AC-side pole (52), the second rectifier circuit (32) has a third AC-side pole (53) and a fourth AC-side pole (54) and the third rectifier circuit (33) has a fifth AC-side pole (55) and a sixth AC-side pole (56),
the first rectifier circuit (31) and the second rectifier circuit (32) are connected in parallel on the DC-voltage side and are connected to a common first DC-voltage-side pole (41) and a common second DC-voltage-side pole (42), wherein
the third rectifier circuit (33) is connected on the DC-voltage side to a third DC-voltage-side pole (43) and a fourth DC-voltage-side pole (44), wherein
the first DC-voltage-side pole (41) is at least connectable to the third DC-voltage-side pole (43) by means of a first current path (36) and
the second DC-voltage-side pole (42) is at least connectable to the fourth DC-voltage-side pole (44) by means of a second current path (37), wherein
at least the first current path (36) or the second current path (37) comprises a semiconductor switch (64).

A propulsion system for an unmanned underwater vehicle includes a turbine engine having a combustor, a turbine, and a mechanical output shaft. The propulsion system further includes an electrical generator having a rotational input connected to the mechanical output shaft, and a poly phase electrical output. A direct current (DC) bus is connected to the poly phase electrical output via a rectifier/inverter. A DC to alternating current (AC) motor drive includes a DC input and a poly phase motor drive output, and a motor connected to the poly phase motor drive output.