Abstract: The mechanical drive system (20) comprises a frame (21), at least one rotating electric machine (22) comprising an end shaft rotor (25) arranged on the frame, and at least one transfer case (23) having at least one driving gear wheel (37). The driving gear wheel is integral with a rotor shaft of the rotating electric machine, the transfer case being arranged on the frame.

Abstract: This power system for mounting on a marine vehicle includes a propulsion unit, means for securing the propulsion assembly to a hull element of the vehicle and a rudder bearing mechanically connecting the propulsion unit with the fittings. The fittings are configured so that once the power system is mounted on the hull element; the plane of the rudder bearing is inclined relative to a plane containing one longitudinal axis and one transverse axis of the marine vehicle.

Abstract: There are provided methods and systems for interfacing converters and solar power arrays. For example, there is provided a method for interfacing a solar power generation apparatus with an electricity grid. The method can include connecting a first level and a second level of the solar power generation apparatus to a two-level converter. Furthermore, the method can include interfacing the two-level converter with the electricity grid via a four-wire connection.

Abstract: A stator for an electrical machine is described. The stator includes a plurality of axially adjacent generally annular laminations. An axially extending coolant passageway through which a coolant fluid flows in use, extends through the stator. A plurality of axially spaced sealing recesses are provided. Each sealing recess is located between a pair of laminations and is in open communication with the surface of the axially extending coolant passageway. Each sealing recess has an axial width greater than the gap between the facing planar surfaces of axially adjacent laminations and is at least partially filled with a cured resin material to define a plurality of axially spaced seals.

Abstract: An inverter system (1) is described. The inverter system (1) includes a DC power source such as a plurality of photovoltaic (PV) panels (8), an inverter (2) and a controller (32). The inverter (2) includes a plurality of semiconductor devices (e.g., controllable semiconductor switches such as IGBTs and anti-parallel connected diodes) arranged in a suitable inverter topology. The inverter (2) includes DC input terminals (4) connected to the PV panels (8) by means of a DC link (10) and at least one AC output terminal (6). When starting the inverter (2), the controller (32) is configured to enable a short circuit state of the inverter (2) by controlling the semiconductor switches to create a short circuit between the DC input terminals (4) such that the inverter (2) carries a current substantially equal to the short circuit current of the PV panels (8).

Abstract: A rotor for an asynchronous rotary electrical machine with non-through shaft comprising a cylindrical magnetic mass gripped between two mounting flanges of two half-shafts. It comprises cooling means that are able to cool the rotor.

Abstract: There is provided a system that includes a processor. The system also includes a memory that stores instructions; when executed by the processor, the instructions configure the processor to perform certain operations. The operations include receiving sensor measurements from an electric power source or device and generating, based on the sensor measurements, a droop control procedure that includes a droop control curve having a non-constant slope. The operations further include regulating a power delivery from the electric power source or device to a bus according to the droop control procedure.

Abstract: A method and a device for controlling a commutation process of a load current between two switching modules are disclosed that each have a MOSFET that can be controlled by a gate-source voltage, and an intrinsic-body inverse diode. To reduce oscillations in the down-commutation of the inverse diodes caused by parasitic circuit parameters, after switching off one of the switching modules, the gate-source control voltage applied to this switching module is temporarily switched off until being increased again the vicinity of the threshold voltage for switching on the MOSFET, before and while the other switching module is switched on, in order to commutate the current from the inverse diode of the one switching module to the MOSFET of the other switching module.

Abstract: Provided is an apparatus, including a capacitor module having a plurality of connecting terminals and a plurality of switch elements. Each switch element has at least one switch terminal coupled to a corresponding connecting terminal, wherein the switch elements are configured for mutually exclusive operation via a control device.

Abstract: Provided are systems and methods for cooling a power converter. For example, there is provided a controller programmed to control a heat transport rate between a coolant disposed in a cooling system and a power converter coupled thereto by regulating a pressure of the coolant in the cooling system.

Abstract: This bidirectional power conversion system for a single-phase electric load is intended to be connected to a continuous supply bus delivering a single supply voltage and deliver to the load an alternating output voltage substantially in a cradle form. It includes a set of intertwined converters able to jointly deliver a control voltage whose phase shift of its fundamental component with respect to the output voltage is intended to control the transfer of power between converters and the load, said converters being controlled in such a way that the amplitude of the average value of the control voltage corresponds to the amplitude of the alternating output voltage and in such a way that said control voltage has amplitudes capable of reducing the fluctuations of a current flowing between the voltage converters and the load.

Abstract: The rotor with a non-through shaft for an electrical machine comprises a cylindrical magnetic mass gripped between two half-shafts each comprising a mounting flange connected to the magnetic mass. Each half-shaft is made in a single piece and comprises a coupling flange located opposite the mounting flange.

Abstract: This rotor for an asynchronous rotating electrical machine with a non-through shaft comprises two half-shafts tightly holding a cylindrical magnetic mass and two short-circuit disks each sandwiched between the half-shafts and one of the ends of the magnetic mass, and conducting bars housed inside the magnetic mass and distributed uniformly along at least one diameter of the magnetic mass such that the short-circuit disks and the conducting bars form a squirrel cage. The half-shafts, the short-circuit disks and the magnetic mass form a gas-tight envelope.

Abstract: This rotor for an asynchronous electrical machine having an end shaft comprises two half-shafts pressing against a cylindrical magnetic block and two short-circuit discs each placed between one different half-shaft and one of the ends of the cylindrical magnetic block. Each half-shaft comprises at least one first means of retention, each short-circuit disc comprises on each of its faces at least one second means of retention and each end of the magnetic block comprises at least one third means of retention, the first, second, and third means of retention mating with one another in such a way as to prevent the short-circuit discs from moving relative to the half-shafts and relative to the magnetic block.

Abstract: The magnetic sheet for rotor with a non-through shaft with no recess at the center thereof is intended to be inserted between two half-shafts of the rotor. It comprises at least one locking means intended to cooperate with adjacent elements so as to prevent a relative movement of said sheet relative to the adjacent elements.

Abstract: A cradle for an electric machine comprises a frame delimiting a seat for receiving part of the machine and extending in a vertical direction and comprising a lower edge and an upper edge, the lower edge being intended for connection to a support. The upper edge comprises one or two receiving seats able to receive a respective bearing and comprising a base wall and two side walls.

Abstract: Provided is a method for performing AC optimal yield control within an inverter that includes a plurality of DC power sources configured to supply DC power, a plurality of converters to convert direct current power to alternating current power to be supplied to a load, a plurality of short-circuit protection devices connected to a DC interconnection bus at the DC power sources, and configured to provide short-circuit protection, a plurality of current sensors configured to sense circulation current at the short-circuit protection devices, and a controller. The controller controls the converters and monitors the circulation current sensed along the DC interconnection bus via the current sensors, and when power reduction occurs at one of the DC power sources, performs a closed-loop control current operation to controllably increase the circulation current along the DC interconnection bus to be greater than an impairment lower limit of the short-circuit protection devices.

Abstract: A system and method of operating a pumped storage power plant using a double fed induction machine with a frequency converter in a rotor circuit is disclosed. A current target value for the rotor current frequency is determined based on a target power to be transmitted between an electrical grid and the double fed induction machine depending on measured actual operating variables. A current inadmissible synchronous deadband is determined depending on variables characterizing a current state of the pumped storage power plant. The synchronous deadband is determined by a permissible minimum required rotor current frequency or speed difference of the rotor speed from the synchronous speed for the stationary operation. The converter is controlled to generate voltages and currents with the current target value of the rotor current frequency if the current target value of the rotor current frequency or speed does not fall in the current inadmissible synchronous deadband.

Abstract: Provided is a premagnetization device for a converter system that is connectable to a three-phase electrical grid that has a three-phase power transformer, a converter connected to the power transformer and a circuit-breaker on the grid side of the power transformer. The premagnetization device is premagnetizes the power transformer in a state isolated from the grid. The premagnetization device uses a single-phase reference voltage (Uref) that has a fixed relationship to the grid voltage (Ugrid) with regard to the voltage parameters, in order to generate, based on the measured instantaneous reference voltage (Uref) and the known fixed parameter relationships, by actuating the converter, a three-phase alternating voltage synchronous to the grid voltage (Ugrid) on the grid side of the power transformer.

Abstract: A magnetic mass for an electric machine rotor movable about an axis extends along the axis and comprises: first longitudinal through-holes able to receive a respective first tie rod and at a first distance with respect to the axis of rotation, in a radial direction substantially perpendicular to the axis of rotation; first tie rods, received in a respective first longitudinal hole. The magnetic mass also comprises: at least one second longitudinal through-hole able to receive a respective second tie rod and at a second distance with respect to the axis of rotation in a radial direction substantially perpendicular to the axis of rotation, the second distance being different from the first distance, and at least one second tie rod received in a respective second longitudinal hole.