GE Energy Power Conversion Technology Patente

A switching module (1) is described. The switching module (1) comprises an H-bridge circuit (2) with four switching assemblies, and an active clamp circuit (6) with four controllable semiconductor switches (S5, S6, ..., S8). Each switching assembly comprises a pair of controllable semiconductor switches electrically connected an anti-series (S1, S2, ..., S4 and S9, S10, ..., S12). Alternatively, each switching assembly may comprise a controllable semiconductor switch and a diode electrically connected in series. The H-bridge circuit (2) comprises first and second AC bridge terminals (AC1, AC2) electrically connectable to a respective coil (4), and first and second DC bridge terminals (DC1, DC2) electrically connectable to a DC current source or to a DC bridge terminal of another switching module. The active clamp circuit (6) comprises first and second DC clamp terminals (DC3, DC4) between which an energy storage device (C) is electrically connected. A plurality of switching modules may be electrically connected together to provide a power electronic switching assembly.

A power system (1) is described. The power system (1) includes an AC/DC power converter (6) electrically connectable to an AC power network (2) and a DC link (8). An electrical load (10) is electrically connected to the DC link (8). A DC/DC power converter (14) is electrically connected to the DC link (8) and an energy storage device (12). A first converter controller (16) is adapted to control the DC/DC power converter (14) to regulate the DC link voltage, and the flow of power between the energy storage device (12) and the DC link (8). The second converter controller (18) is adapted to control the AC/DC power converter (6) and to regulate or control at least one of the voltage at the AC terminals of the AC/DC power converter (6), inertial AC power, and synchronisation with the AC power network (2).

A stator assembly (1) of an axial flux electrical machine is described. The stator assembly (1) includes a plurality of stator coils (4) and a plurality of core segments (2) arranged circumferentially to define a segmented stator core (3). Each core segment (2) includes a tooth part (2a) that extends axially and which is adapted to mount a respective stator coil (4). The stator core (3) can also be non-segmented with a plurality of tooth parts arranged circumferentially. Adjacent mounted stator coils (4) are spaced apart by a substantially trapezoidal void. The stator assembly (1) also includes a plurality of stator coil retainers (10). Each retainer (10) is received in a respective void between a pair of adjacent mounted stator coils (4) and its position in the radial direction is independently adjustable. Each retainer (10) includes at least one channel for receiving a cooling fluid (e.g., cooling air or a suitable cooling liquid such as water or propylene glycol). Each retainer (10) also includes a pair of contact surfaces that are spaced apart in the circumferential direction. Each retainer (10) is adapted to apply a contact pressure to the respective pair of adjacent mounted stator coils (4) through the contact surfaces.

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A system comprising a rotor (11) for a rotating electric machine and bearings maintaining the rotor in rotation, the rotor being a non-through shaft comprising two half-shafts (13) holding tightly a cylindrical magnetic mass (14) comprising a plurality of stacked laminations, circumferential tie rods (15) distributed uniformly over a first diameter of the magnetic mass so as to keep the magnetic mass compacted between the half-shafts is proposedThe rotor further comprises polar tie rods (29) distributed in an angular sector of each pole with respect to a rotation axis of the rotor so as to keep the magnetic mass compacted between the half-shafts and to stabilize the rotor in rotation according to the bearings, each angular sector comprising the same number of polar tie rods.

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A switching module (10_p) is described. The switching module (10_p) comprises an H-bridge circuit (16) with bidirectional switches (S1-S4) and an active clamp (18) with switches (S5-S8) that are also arranged as an H-bridge. A process of commutating the switching module (10_p) comprises a sequence of alternating first and second commutation events. The timing signals used to control the switches (S1-S8) during each commutation event are varied according to closed loop control of the voltage across the energy storage device (C) of the active clamp (18).

An electric circuit is described. The electric circuit may be part of a power converter and may include a plurality of electrically connected thyristors (Ta, Tb, ..., Tn). Each thyristor (Ta, Tb, ..., Tn) has a gate terminal (26a, 26b, ..., 26n) electrically connected to a gate drive unit (28a, 28b, ..., 28n) adapted to generate gate pulses for triggering the thyristor. At least one of the plurality of gate drive units (26a, 26b, ..., 26n) is adapted to measure the gate voltage of the respective thyristor (Ta, Tb, ..., Tn) after one or more gate pulses have been applied to the respective thyristor. The measured gate voltage may be used to determine if a thyristor has not been triggered by the gate pulse(s) - e.g., if the gate voltage is below a voltage threshold.

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An electrolyser plant (1A) is described. The electrolyser plant (1A) includes a first DC link (8) with at least one DC link capacitor (C1) and an AC/DC power converter (6). An electrolyser (10) is electrically connected to the first DC link (8) and adapted to receive a load current. During normal operation of the AC power network (2), a controller (12) is adapted to maintain a pre-event DC link voltage and supply a pre-event load current to the electrolyser (10). In response to a detected low voltage event, the controller (12) is adapted to: (a) initially supply the pre-event load current to the electrolyser (10) to maintain normal operation of the electrolyser (10), (b) monitor the DC link voltage, e.g., the voltage in the first DC link (8), and (c) if the monitored DC link voltage falls below a first voltage threshold that is less than the pre-event DC link voltage, reduce the load current supplied to the electrolyser (10), optionally by ramping down the load current at a suitable ramp rate.

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A rotor (8) for an electrical machine (1) is described. The rotor (8) includes a rotor body (10) and a plurality of rotor segments (12a, 12b, ..., 12p) connected to the rotor body (10). The rotor segments (12a, 12b, ..., 12p) are arranged circumferentially around the rotor body (10). Each rotor segment (12a, 12b, ..., 12p) includes amounting surface that defines part of a radially inner or outer surface of the rotor (8). Each rotor segment (12a, 12b, ..., 12p) also includes a plurality of permanent magnet modules (24) that are mounted to the mounting surface (16) to define an array of rotor poles arranged circumferentially around the radially inner or outer surface of the rotor (8). One of the plurality of rotor segments (12o) is removably connected to the rotor body (10) and the one or more permanent magnet modules (24) that are mounted to its mounting surface (16) are removably mounted and can be removed during repair or servicing of the electrical machine (1).

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A negative relative pressure cooling system for an item of industrial equipment (e.g., an electrical machine or transformer) is described. The item of industrial equipment includes a cooling passageway (2) adapted to cool part of the item of industrial equipment (24). The cooling system (4) is connected to the cooling passageway (2) and adapted to move cooling liquid through the cooling passageway (2) at a pressure less than the ambient atmospheric pressure.

A compaction plate (8, 9) for magnetic mass (6) is proposed.The compaction plate comprises a plurality of laminated magnetic sheets (7), the laminated magnetic sheets being fixed together with fixing and electric insulating means.

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