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: 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: 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 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: 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: 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: A power distribution system has a power converter with a plurality of semiconductor switching devices per phase, a PWM controller, and a current limitation controller. The current limitation controller is adapted, at least when a short-circuit fault is detected, to calculate the difference between a measured current for each phase and a reference current for the corresponding phase. If the calculated difference is located outside a predetermined current range centered about the reference current for the corresponding phase, the current limitation controller will allow the semiconductor switching devices of the corresponding phase to be turned on and off by the PWM controller. Otherwise, if the calculated difference is located inside the predetermined current range, the current limitation controller will control the semiconductor switching devices for the corresponding phase to be turned off irrespective of the PWM control strategy applied by the PWM controller.

Abstract: The shaft for a rotating electrical machine comprises at least one housing element (8a, 8b, 8c) extending in an axial direction (A) and emerging outwards in a radial direction, with one side of the housing element emerging outwards in an axial direction, and with the housing being able to accommodate at least one insulated electrical conductor (6) and a spacer (9a, 9b, 9c).

Abstract: There is provided a power converter unit that can include an inverter and a plurality of batteries. The inverter and the plurality of batteries can be cooled by a common thermal management system. Furthermore, the power converter unit that can include a battery enclosure and the inverter can be co-located with the plurality of batteries inside the battery enclosure.

Abstract: A power switch apparatus for a power converter includes a semiconductor power switch and a gate drive unit connected to the semiconductor power switch for supplying gate drive signals to the semiconductor power switch to switch it on and off to cause the power converter to generate an alternating current voltage having a nominal operational frequency based on command signals received from a controller. The gate drive unit receives command signals based on the AC voltage to be generated and to alter the switching events of the semiconductor power switch by addition of a pre-defined jitter-like deviation to the gate drive signals such as to cause the power converter to generate an AC voltage having a modified operational frequency which partly and temporarily deviates from the nominal operational frequency by a pre-defined minimum percentage. A power converter comprising such a power switch apparatus is also disclosed.

Abstract: A method and apparatus is described for reformulating raw gas and/or reducing and/or converting the tar in a raw gas from a gasification reaction. More specifically, a gas reformulating system having a gas reformulating chamber, one or more sources of or means for generating non-equilibrium plasma, and optionally one or more oxygen source(s) inputs and control system is provided. Methods of reformulation and/or reducing the tar concentration in a raw gas from a gasification reaction that uses non-equilibrium plasma are also provided.

Abstract: Provided is a deionized-water cooling system having a main circuit for cooling electrical equipment. The system includes a deionizer circuit including (i) a deionizer for producing deionized water and (ii) a throttle and a main pumping system configured for circulating (i) the deionized water within the main circuit at a first flow rate and (ii) the water flow within the deionizer at a second flow rate. The circulating occurring when the electrical equipment is operating. The electrical equipment is configured for receiving power from a primary power source. Also included is a secondary pumping system configured for (i) receiving power from a secondary power source, (ii) circulating the deionized water within the main circuit, and (iii) circulating the water flow within the deionizer at the second flow rate via the throttle when the electrical equipment is inoperable.

Abstract: A power distribution system including first and second ac busbars connected to ac generators. A first active rectifier/inverter has ac input terminals electrically connected to the first ac busbar. A second active rectifier/inverter has ac input terminals electrically connected to the second ac busbar. A first dc interface is electrically connected to dc output terminals of the first active rectifier/inverter and a second dc interface is electrically connected to dc output terminals of the second active rectifier/inverter. The dc interfaces include reverse blocking means. A third active rectifier/inverter operates as a drive and has dc input terminals electrically connected in the parallel to dc output terminals of the first and second dc interfaces by means of an interposing dc busbar. An electric motor, that can optionally form part of a marine thruster T1, is electrically connected to ac output terminals of the third active rectifier/inverter.

Abstract: The present invention provides a marine propulsion system that is suitable for any civilian and military marine vessels and which offers operational flexibility. The marine propulsion system includes a pair of ac busbars, each in parallel connection with a power converter. The respective power converters each connected in parallel to a propulsion motor.

Abstract: A converter control arrangement (18) for regulating the output current of a dc source power converter (16) comprises a current regulator (20) for regulating the output current based on a comparison of an output current value (Iout) of the dc source power converter (16) with a desired target current value (Itgt). When the output voltage value (Vout) of the dc source power converter (16) is within a normal operating voltage range between minimum and maximum voltage values (Vmin, Vmax) defined with respect to a voltage reference value (Vref) of the dc source power converter (16), the converter control arrangement (18) controls the target current value (Itgt) so that it is equal to a desired reference current value (Iref).

Abstract: A method for operating an electrical circuit, in particular of a converter is described. The circuit, in at least one embodiment, includes a line-side converter that is coupled to a capacitor. The line-side converter includes at least two series connections, each including at least two power semiconductor elements, and each of the at least two series connections being connected parallel to the capacitor. The line-side converter is coupled to an energy supply system. The DC voltage that is present at the capacitor is determined. A maximum voltage is predetermined. If the DC voltage present at the capacitor is determined to be greater than the maximum voltage, then at least two of the power semiconductor elements are switched into their conductive state in such a manner that the capacitor is discharged in the direction of the energy supply system.

Abstract: An electric drive-train for a ship includes a first generator having a rotatable shaft structured to be driven by a first prime mover and an output providing a voltage; a second generator having a rotatable shaft structured to be driven by a second prime mover and an output providing a voltage; an electric machine including a rotatable shaft structured to drive a propeller; a first power electronic converter electrically interconnected with the output of the first generator and structured to power the electric machine; and a second power electronic converter electrically interconnected with the output of the second generator and structured to power the electric machine. A support structure replaces a reduction gear box and supports the first generator, the second generator, the electric machine, the first power electronic converter, and the second power electronic converter.

Abstract: A support structure is used to mount the stator of a rotating electrical machine (e.g. a motor or generator). The support structure includes a rigid external support frame (6). To minimise the transmission of vibrations caused by stator electromagnetic forces into the external support frame (6), at least one sandwich anti-vibration mount (14a) is secured between the external support frame (6) and a part of the stator (28). The mount (14a) is oriented relative to the stator such that it experiences compression loading in a substantially tangential direction of the stator and radial shear loading in a substantially radial direction of the stator during operation of the rotating electrical machine. The sandwich anti-vibration mount (14a, 14b) is pre-loaded with a pre-determined compression load substantially along its compression axis (Ac).